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V) NBS TECHNICAL NOTE 956

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U.S. DEPARTMENT OF COMMERCE/ National Bureau of Standards

FORTRAN Program To Determine

Length of Gage Blocks Using

Single Wavelength Interferometry
NATIONAL BUREAU OF STANDARDS

The National Bureau of Standards 1 was established by an act of Congress March 3, 1901. The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measurement system, (2) scientific and

technological services for industry and government, (3) a technical basis for equity in trade, and (4) technical services to pro- mote public safety. The Bureau consists of the Institute for Basic Standards, the Institute for Materials Research, the Institute for Applied Technology, the Institute for Computer Sciences and Technology, the Office for Information Programs, and the

Office of Experimental Technology Incentives Program.

THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States of a complete and consist- ent system of physical measurement; coordinates that system with measurement systems of other nations; and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community, industry,

and commerce. The Institute consists of the Office of Measurement Services, and the following center and divisions: Applied Mathematics — Electricity — Mechanics — Heat — Optical Physics — Center for Radiation Research — Laboratory Astrophysics 2 — Cryogenics 2 — Electromagnetics 2 — Time and Frequency 3

. THE INSTITUTE FOR MATERIALS RESEARCH conducts materials research leading to improved methods of measurement, standards, and data on the properties of well-characterized materials needed by industry, commerce, educational insti- tutions, and Government; provides advisory and research services to other Government agencies; and develops, produces, and

distributes standard reference materials. The Institute consists of the Office of Standard Reference Materials, the Office of Air and Water Measurement, and the following divisions:

Analytical Chemistry — Polymers — Metallurgy — Inorganic Materials — Reactor Radiation — Physical Chemistry.

THE INSTITUTE FOR APPLIED TECHNOLOGY provides technical services developing and promoting the use of avail- able technology; cooperates with public and private organizations in developing technological standards, codes, and test methods; and provides technical advice services, and information to Government agencies and the public. The Institute consists of

the following divisions and centers:

Standards Application and Analysis — Electronic Technology — Center for Consumer Product Technology: Product Systems Analysis; Product Engineering — Center for Building Technology: Structures, Materials, and Safety; Building

Environment; Technical Evaluation and Application — Center for Fire Research: Fire Science; Fire Safety Engineering.

THE INSTITUTE FOR COMPUTER SCIENCES AND TECHNOLOGY conducts research and provides technical services designed to aid Government agencies in improving cost effectiveness in the conduct of their programs through the selection,

acquisition, and effective utilization of automatic data processing equipment; and serves as the principal focus wthin the executive branch for the development of Federal standards for automatic data processing equipment, techniques, and computer

languages. The Institute consist of the following divisions: Computer Services — Systems and Software — Computer Systems Engineering — Information Technology.

THE OFFICE OF EXPERIMENTAL TECHNOLOGY INCENTIVES PROGRAM seeks to affect public policy and process

to facilitate technological change in the private sector by examining and experimenting with Government policies and practices in order to identify and remove Government-related barriers and to correct inherent market imperfections that impede

the innovation process. THE OFFICE FOR INFORMATION PROGRAMS promotes optimum dissemination and accessibility of scientific information generated within NBS; promotes the development of the National Standard Reference Data System and a system of in- formation analysis centers dealing with the broader aspects of the National Measurement System; provides appropriate services

to ensure that the NBS staff has optimum accessibility to the scientific information of the world. The Office consists of the following organizational units:

Office of Standard Reference Data — Office of Information Activities — Office of Technical Publications — Library —

Office of International Standards — Office of International Relations.

1 Headquarters and Laboratories at Gaithersburg, Maryland, unless otherwise noted; mailing address Washington, D.C. 20234.

2 Located at Boulder, Colorado 80302.
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FORTRAN Program To Determine

l<3

Length of Gage Blocks Using

W* Single Wavelength Interferometry

Ruth N. Varner

Institute for Basic Standards

National Bureau of Standards

Washington, D.C. 20234

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U.S. DEPARTMENT OF COMMERCE, Juanita M. Kreps, Secretary

Dr. Sidney Harman, Under Secretary

Jordan J. Baruch, Assistant Secretary for Science and Technology

O • V NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Acting Director

Issued September 1977
National Bureau of Standards Technical Note 956

Nat. Bur. Stand. (U.S.), Tech. Note 956, 55 pages (Sept. 1977) CODEN: NBTNAE

U.S. GOVERNMENT PRINTING OFFICE WASHINGTON: 1977

For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402

Price $2—Stock No. 003-003-01840-6
FORTRAN PROGRAM TO DETERMINE LENGTH OF GAGE BLOCKS

USING SINGLE WAVELENGTH INTERFEROMETRY

Ruth N. Varner

Office of Measurement Services

Abstract

A description of a computer program which computes the length of

gage block from a process using single wavelength interferometry is

given. The computer program has been written in American National

Standards Institute FORTRAN, with emphasis on making it as machineindependent as possible. A sample of input and output is given.

Key Words: FORTRAN computer program; gage blocks; interferometry

1. INTRODUCTION

The computer program described in this paper computes and reports

the length of a gage block from a measurement process using single

wavelength interferometry. The computer subprograms are written in

American National Standards Institute Fortran thereby making them

transportable. Descriptions of the input, computations, and output

are given. Listings of the computer subprograms are included along

with a sample run. For a detailed report on the measurement process,

see NBS Monograph 152, "A Gage Block Measurement Process Using Single

Wavelength Interferometry."

2. DESCRIPTION OF INPUT

A part of the input data to the computer program is in fixed field

format and the remainder in free field format. A fixed field format

specifies that the data must be punched in specific columns on the

input card or recorded in specific fields of an input record. In

addition, the data must be right justified in the allotted fields.

Free field format allows the data in the allotted fields to appear

anywhere in the input record. Data recorded in the free field format

is accepted only if it is numeric. Non-numeric characters are ignored

except in the cases where a "D" is used to denote double precision

data or an "E" is used to denote floating point data. Numerical

values are separated from each other by one or more blanks or a comma. Alphanumeric data consists of numbers, alphabetic letters and special

characters like : or /. The description of the data which follows

implies the use of cards as input. Other media, such as a magnetic

tape or a mass storage data file, using the same specifications may be

used. See Section 5.1 for an example. Sections 4 and 5 of NBS

Monograph 152 describe in detail the procedures used in acquiring the

data.

1
Card Data

No. Description

1 Test number

Time (hr:min)

Observer

Platen Number

Month

Day

Year

Interferometer number*

1 for Zeiss-LB (long blocks)

2 for Hilger 1955 (short blocks)

3 for Zeiss-SB (short blocks)

Bridge reading (before

normal observation)

Bridge reading (before

reverse)

Bridge reading (after

normal observation)

Bridge reading (after

reverse)

*The interferometer number may refer to different interferometers

than those mentioned above. See Section Al.B.

Column

Data Type Position

Alphanumeric 2 - 7

Alphanumeric 9 - 13

Alphanumeric 15 - 17

Alphanumeric 19 - 21

Numeric "\

Numeric i Numeric These values

Numeric / separated by

/ one or more

blanks or a

) comma appear

Numeric f anywhere between

23 - 80 in the

Numeric \ order specified.

Numeric

Numeric J

Numer

Numer

Numer

Numer

Numer

Numeri

Thermocouple reading for

the block (uV)

Thermocouple reading for

the air (yV)

First barometric pressure

reading in mm of Hg

Second barometric pressure

reading in mm of Hg

Hygrometer dial reading

Hygrometer element number**

1 for #6388 (long blocks

2 for #6499 (long blocks

3 for #6331 (short blocks)

4 for #6415 (short blocks)

5 for #7536 (short blocks)

6 for #7530 (short blocks)

**The hygrometer element number may refer to different elements than

the ones specified above. See Section Al.B.

These values

separated by one or more

blanks or a comma appear

anywhere between

1 - 80 in the

order specified.
Number of blocks using the

above conditions***

Numeric Anywhere in

1-80.

***This number is 1 for long blocks. For short blocks it is the

number of blocks wrung to the platen.

Block serial number

Nominal block length (inches)

Assumed block length (inches)

Coefficient of expansion

(in micro inches per

degrees Celsius of block)

Maker of block

MAT for Matrix

DOA for DoAll

P+W for Pratt & Whitney

HOM for Hommel

WEB for Weber

CEJ for CEJ

FON for Fonda

F-J for Ford Johnsen

Material of block

ST for steel alloy

CC for chrome carbide

TC for tungsten carbide

CV for cervit (glass ceramic)

CS for cervit plus steel

Type of block

REC for rectangular

SQR for square

RND for round

R+S for cervit and steel

First fringe fraction reading

Second fringe fraction reading

Third fringe fraction reading

Fourth fringe fraction reading

Fifth fringe fraction reading

Sixth fringe fraction reading

Alphanumeric

Numeric

Double precision

numeric

Double precision

numeric

Alphanumeric

Alphanumeric

Alphanumeric

Numeri

Numeri

Numeri

Numeri

Numeri

Numeri

"c

'c

'c"c

'c

'c

19

28

41

71

- 6

- 20

- 40

- 60

- 73

75 - 76

78 - 80

These values

separated by one or more

blanks or a comma appear

anywhere between

1 - 80 in the

order specified.

Cards 4 and 5 are repeated for the number of times indicated on card 3. If more data is available, repeat cards 1 through 5. The

end of data is denoted by the flag STOP punched in columns 2-5

of the final card.
3. COMPUTER PROGRAM

This section contains a listing of the computer program with all

its subprograms needed to carry out the necessary input, calculations,

and output. The subprograms are written in American National

Standards Institute Fortran thereby making them transportable.

Alphanumeric data is restricted to three characters per computer word.

Hard copy output is restricted to 120 characters per line. Card

output is restricted to 80 columns. The program was written for the

Univac 1108 and is operational under the EXEC-8 operating system.

There are 1580 lines of Fortran code consisting of one main program,

ten subprograms, and one BLOCK DATA subprogram. The BLOCK DATA

subprogram contains all the variables which may need to be changed due

to the replacement of any of the equipment used in the interferometric

measurements. In addition to the Fortran COMMENT statements dispersed

throughout the subprograms, there is a description of the function of

each subprogram on the right hand side of the listing.

3.1 Flow Diagram of Computer Program

MAIN

PROGRAf*1 ^^^ c j" ^^~

VARIABLE COMPUTE CONVERT COMPUTE COMPUTE OUTPUT

INPUT CORRECT

BRIDGE

RESISTANCE

TO

VAPOR

PRESSURE

BLOCK

LENGTH

RESULTS

READINGS TEMPERATURE T

INF>UT

1 QUADRATIC INTERS EDIATE

ERROR SOLUTION RESULTS

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32
4. DESCRIPTION OF OUTPUT

The output from the computer program consists of two parts.

A printed page is generated for each block. This contains the

environmental conditions, the instruments used in the measurement, the

calculated values: temperature, pressure, humidity, vapor pressure

and final length of block. The end of the page contains the printout

of some of the intermediate calculated values. See Section 5. Sample

Run.

Two punched cards are produced for each calculation of length,

cards have the following format.

These

Card Input or Column

No. Computed Variable Type Position

1 Input Block serial number Alphanumeric 1 - 6

Input Nominal block length Numeric 8 - 18

Input Month Numeric 20 - 21

Input Day Numeric 23 - 24

Input Year Numeric 26 - 27

Computed Length correction

(micro-inches)

Numeric 29 - 34

Input Coefficient of expansion

(micro-inches per degree

Celsius of block)

Numeric

5 36 - 45

Computed Pressure (mm of Hg) Numeric 47 - 53

Computed Air temperature (Celsius) Numeric 55 - 61

Computed Block temperature

(Celsius)

Numeric 63 - 69

Input Maker of block Alphanumeric 71 - 73

Input Material of block Alphanumeric 75 - 76

Input Type of block Alphanumeric 78 - 80

Input Block serial number

Input Nominal block length

Input Month

Input Day

Input Year

Computed Length correction

(micro- inches)

Computed Vapor pressure (mm of Hg)

Computed Fringe fraction

Input Platen

Input Assumed block length

(inches)

Input Maker of block

Input Material of block

Input Type of block

Alphanumeric

Numeric

Numeric

Numeric

Numeric

Numeric

Numeric

Numeric

Alphanumeric

Numeric

Alphanumeric

Alphanumeric

Alphanumeric

18

20

23

26

29

36

41

46

50

70

75

78

6

18

21

24

27

34

39

44

48

60

73

76

80

33
5. SAMPLE RUN

Included in this section is a sample run consisting of listings of the input, printed output, and punched card output.

5.1 Listing of Input Data For Sample Run

LONG! 12146 RNV H-4 4 16 73 1 27.52715 27.52590 27.52590 27.52715 Card 1 -.56 .05 758.28 758.28 66.0 1 Card 2

l Card 3 2306 io.o 10.00000200 n.50-6 DOA st rec Card 4 969 1045 1221 1221 1045 967 Card 5 LONG2 1:47 RNV H-7 4 16 73 1 27.52715 27.52590 27.52590 27.52715 Card 1 -.56 .05 758.28 758.28 40.0 2 Card 2

i Card 3 2306 10.0 10.00000200 1 1 . 5D-6 DOA ST REC Card 4 969 1045 1221 122 1 1045 967 Card 5 L9697 1151 CDT VK2 02 23 76 3 27.54140 27.54140 27.54140 27.54140 Card 1 3.0 3.17 757.27 757.32 62 5 Card 2 2 Card 3 194 .127 .127002 1 1 . 50D-6 HOM ST REC Card 4 594 648 834 833 646 594 Card 5 9L5 .133 .132999 11.500-6 FON ST R Card 4 655 797 890 890 795 652 Card 5 stop Flag to terminate run.

5.2 Listing of Card Output From Sample Run

2306 10.000000 4 16 73 -2.39

2306 1C.C00000 4 16 73 -2.39

2306 10.000000 4 16 73 -.53

2306 10 .ocoooo 4 16 73 -.53

194 .127000 2 23 76 2.89

194 .127000 2 23 76 2.89

9U5 .133000 2 23 76 -.49

9L5 .133000 2 23 76 -.49

.00001150 758.28 19.999 19.984 DOA ST REC

4.6 .30 H-4 10.0000020 DOA ST REC

.00001150 758.28 19.999 19.984 DOA ST REC

7.9 .30 H-7 10.0000020 DOA ST REC .00001150 757.29 19.924 19.920 HOM ST REC

4.1 .22 VK2 .1270020 HOM ST REC .00001150 757.29 19.924 19.920 FON ST R 4.1 .60 VK2 .1329990 FON ST R

34
5.3 Listinq of Printed Output From Sample Run

INTERFEROMETRIC GAGE BLOCK MEASUREMENT

SERIAL NO. 2306 TEST NO. L0NG1 INTERFEROMETER ZEISS-LB

NOMINAL SIZE 10.000000 DATE 4/16/73 MEAS. FRINGE FRAC. ASSUMED LENGTH TIME 12:46 LIGHT SOURCE LASER NO. IODINE

.10C000020+002 OBSERVER

COEF OF EXP .115000-04 PLATEN

MAKER DOA MATERIAL ST TYPE REC

RNV VAC. WAVELENGTH .6329 90074+000

H-4 SLIT CORR .6200000-08

OBLIQ CORR .0000000

PHASE CORR .0000000

BRIDGE 10 107634

BAROMETER ID SI 1264

THERMOMETER ID 206

HYGROMETER 10 6388

ENVIRONMENT

TEMPERATURE

BRIDGE

READINGS

MEAN CCRR

ThERM. RESISTANCE

REF. TEMP. THERMOCOUPLE(BLOCK) -.014

Tt-ERMOCOUPLE(AIR) .001 BLOCK TEKP. .19984+002

AIR TEMP. .19999+002

PRESSURE HUMIDITY

27.52715 BAROMETER 758.28 HYGROMETER

27.52590 READINGS 758.28 READING 66.0

27.52590

27.52715

27.52652 758.28

-.00077 1 .8 27.52575 PRESSURE 758.28 HUMIDITY 26.5

19.998 VAPCR PRESS 4.6

FINAL LENGTH OF BLOCK 9.9999976 1 CORRECTION -2.39

NUMBER OF FR INGES= EFFECTIVE WAVELENGTH=

FPRIME=

.80275766+006

.6328 1863+0 02 .80275730+006

A=C= LTPRIM=

TA=

P=

.29 090595-003

.25839945-006

. 10000000+002

. 19998861+002

•75828C00+003

B= BETA= L21= TB=

F=

.93216834+000

.99999981+000

.99999976+001

.19983733+002

.460741 17+001

35
INTERFEROMETRIC GAGE BLOCK MEASUREMENT

SERIAL NO. 2306 TEST NO. NOMINAL SIZE 10.000000 DATE ASSUMED LENGTH TIME •1OC000O2O+O02 OBSERVER

COEF OF EXP .115000-04 PLATEN

MAKER DOA MATERIAL ST TYPE REC

L0NG2 INTERFEROMETER ZEISS-LB

4/16/73 MEAS. FRINGE FRAC. .30 1147 LIGHT SOURCE LASER NO. IODINE RNV VAC. WAVELENGTH .6329 90074+000

H-7 SLIT CORR .6200000-08

OBLIQ CORR .0000000

PHASE CORR .0000000

BRIDGE ID 107634

BAROMETER ID S11264

THERMOMETER ID 206

HYGROMETER ID 6499

ENVIRONMENT

TEMPERATURE PRESSURE HUMIDITY

BRIDGE 27.52715

READINGS 27.52590

27.52590

27.52715

MEAN 27.52652

CORR -.00077

THERM. RESISTANCE 27.52575

REF. TEMP. 19.998

THERMOCOUPLE(BLOCK) -.0 14 THERMCCOUPLE(AIR) .001

BLOCK TEMP. .19984+002

AIR TEMP. .19S59+002

BAROMETER

READINGS

PRESSURE

758.28

758.28

758.28

758.28

HYGROMETER

READING

HUMIDITY

VAPOR PRESS

1 .8 45.5

7.9

FINAL LENGTH OF BLOCK

CORRECTION

9.95999947

-.53

NUMBER OF FRINGES=

EFFECTIVE WAVELENGTH= FPRIME=

.80275751+006

.63281875+002

.80275730+006

A=

C= LTPRIM=

TA=

P=

.29090595-003

.44436448-006

. 10000000+002

. 19996861 + 002

.75828000+003

B= BETA=

L21 = TB=

F =

.93216834+000

.9999 9981+000

.99999995+001

. 19983733+002

.79232759+001

36
INTERFEROMETRIC GAGE BLOCK MEASUREMENT

SERIAL NO. NCMINAL SIZE

ASSUMED LENGTH TIME .127002000+000 OBSERVER

COEF OF EXP .115000-04 PLATEN

MAKER HOM MATERIAL ST TYPE REC

194 TEST NO. L9697 INTERFEROMETER ZEISS-SB

.127000 DATE 2/23/76 MEAS. FRINGE FRAC. .22 1151 LIGHT SOURCE LASER NO.PE-184

CDT VAC. WAVELENGTH .6329 91419+000

VK2 SLIT CORR .6200000-08

OBLIQ CORR .0000000

PHASE CORR .0000000

BRIDGE ID 045848

BAROMETER ID U11485

THERMOMETER ID 183335

HYGROMETER ID 7536

ENVIRONMENT

TEMPERATURE PRESSURE HUMIDITY

BRIDGE

READINGS

MEAN CCRR THERM. RESISTANCE

REF. TEMP. THERMOCOUPLE(BLOCK)

THERMOCOUPLE (AIR)

BLOCK TEMP.

AIR TEMP.

27.54140

27.54140

27.54140

27.54140

27.54140

-.00049

27.54091

19.846

.074

.079

. 19920+002

.19924+002

BAROMETER

READINGS

PRESSURE

757.27

757.32

757.29

757.29

HYGROMETER

READING

1.8

HUMIDITY 23.3

VAPOR PRESS 4.1

FINAL LENGTH OF BLOCK

CORRECTION

,12700289

2.89

NUMBER OF FRINGES=

EFFECTIVE WAVELENGTH=

FPRIME=

. 10195149+0 05 .63282014+002

. 10195221+005

A=C= LTPRIM=

TA=P=

.29052805-003

.22728539-006

.12700188+000

. 19924338+002

.75729500+003

B= BETA= L21=

TB=

.93240557+000

.99999908+000

. 12700290+000

. 19920122 + 002

.40526296+001

37
INTERFEROMETRIC GAGE BLOCK MEASUREMENT

SERIAL NO. 9L5 TEST NO. L9697 INTERFEROMETER ZEISS-SB

NOMINAL SIZE .133000 DATE 2/23/76 MEAS. FRINGE FRAC. .60 ASSUMED LENGTH TIME 1151 LIGHT SOURCE LASER NO.PE-184

.132999000+000 OBSERVER CDT VAC . WAVELENGTH .6329 91419+000

CCEF OF EXP .115000-04 PLATEN VK2 SLIT CORR .6200000-08

MAKER FON OBLIQ CORR .0000000

MATERIAL ST PHASE CORR .0000000

TYPE . R BRIDGE ID 045848 THERMOMETER ID 183335

BAROMETER ID U11485 HYGROMETER ID 7536

ENVIRONMENT

TEMPERATURE PRESSURE HUMIDITY

BRIDGE 27.54140 BAROMETER 757.27 HYGROMETER

READINGS 27.54140 READINGS 757.32 READING 62.0

27.54140

27.54140

MEAN 27.54140 757.29

CCRR -.00049 1.8 THERM. RESISTANCE 27.54091 PRESSURE 757.29 HUMIDITY 23.3

REF. TEMF. 19.846 VAPOR PRESS 4.1

THERMOCOUPLE (BLOCK) .074

THERMOCOUPLE(AIR) .079

BLOCK TEMP. .19920+002

AIR TEMP. .19924+002

FINAL LENGTH OF BLOCK .13299951

CORRECTION -.49

NUMBER OF FRJNGES= .10676561+0 05 EFFECTIVE WAVELENGTH= .63282014+002

FFRIME= .10676603+005

A= .29052805-003 B= .93240557+000

C= .22728539-006 BETA= .99999908+000

LTPRIM= . 1329?ee8+C00 L21= .13299951+000

TA= .19924338+002 TB= .19920122+002

P= .757295CO+003 F= .40 526296+001

38
ERROR MESSAGES

1. CHECK DATA followed by last data card read.

This message is printed by the main program and execution is

terminated under the following conditions:

a. Number of numeric values on data card 1 f 8

b. Number of numeric values on data card 2^6

c. Number of numeric values on data card 3 f 1 d. Number of numeric values on data card 5^6

2. CHECK FRINGE FRACTION DATA

This message is printed by the main program if the absolute

difference of corresponding fringe fraction is greater than 3.

The calculations are continued.

3. CHECK RESISTANCE AVERAGE followed by listing of dial readings.

This message is printed by the subprogram BAVGCO and execution is

terminated if the resistance dial readings do not fall in the

range to 9.

4. FRINGE FRACTION IS NEGATIVE OR GREATER THAN 1

This message is printed by the subprogram COMPUT if the computed

value of the observed fringe fraction is negative or greater than

1. Execution is terminated when this occurs.

5. The remainder of the possible error messages are produced by the

subprogram ERROR. They may occur when the input data is not in a correct format.

ACKNOWLEDGEMENTS

The author gratefully acknowledges the assistance of John Beers and

Clyde Tucker who supplied the data and other essential parameters. She

also acknowledges the efforts of Roy Wampler who supplied the free

field input subprogram and Clayton Albright who wrote the subprogram

for converting a double precision number to a fixed point number.

39
REFERENCES

1. Riddle, J. L., et al , "Platinum Resistance Thermometry," National

Bureau of Standards Monograph 126 (1973).

2. Beers, John S., "A Gage Block Measurement Process Using Single

Wavelength Interferometry," National Bureau of Standards Monograph

152 (December 1975).

3. American Standard Fortran (1966), American National Standards

Institute, Inc., New York.

40
APPENDIX A

Al. Parameters in BLOCK DATA Subprogram

Al .A Input-Output Units

IN = 5 input unit (card reader)

IOUT = 6 output unit (printer)

IPCH = 1 output unit (punch)

Al.B The following table defines each parameter, it's computer

program variable name, and its current value at the time this

paper was published. Numbers enclosed in brackets beside the

parameter value is the number used for input. (See Section 2.

Description of Input, card 1 and card 2.) As indicated in the

table the apparatus used for measuring long and short blocks are different. Two different sets of apparatus may be used in

measuring short blocks.

Computer

Variable

INTSNO

Description

Interferometric

serial number

Long

Blocks Short Blocks

[l]Zeiss-LB [2]Hilger 1955 [3]Zeiss-SB

LSSNO Laser serial

number

IODINE SP-163 PE-184

VACWLN Vacuum wavelength .632990074 .632991420 .632991419

HYGSNO Hygrometer serial

number

(range 8% - 40%)

[1]6388 [3]6331 [5]7536

Hygrometer serial [2]6499

number

(range 30% - 80%--long blocks)

(range 35% - 80%--short blocks)

[4]6415 [6]7530

BRDSN0 Bridge serial

number

107634 118684 045848

THRSN0 Thermometer serial

number

206 184 183335

BARSN0 Barometer serial

number

SI 1264 SI 2566 Ul 1485

41
-6

.0248%i'V .0248°/yV

.016 x 10" 6

.0062 x 10

.166 x 10" 6

0.0

0.0 0.0

-6

CONFAC Thermocouple .0248

conversion factor

SLTCOR Slit correction .0062 x 10

OBLCOR Obliquity correction 0.0

PHSCOR Phase correction 0.0

When a newly calibrated resistance bridge is introduced, the

bridge serial number (BRDSNO) must be changed. Associated with each

bridge there is a table of corrections. The appropriate variables

ITEN, IUNIT, ITENTH, IHUND need to be changed.

When a newly calibrated platinum resistance thermometer is

introduced, the thermometer serial number (THRSNO) must be changed.

The constants a (Alpha), 6 (Delta), and R (RICEPT) in the international

practical temperature scale formulas must be changed.

When a newly calibrated hygrometer is introduced, the hygrometer

serial number (HYGSNO) must be changed.

The coefficients (COEFF) of the polynominal used to convert the

hygrometer readings to relative humidity must be recomputed.

A2. Cross Reference of Labeled Common

Common Size Subprograms

Block (Computer Using Labeled

Name Words) Common

OUT 39 MAIN COMPUT OUTPUT

C0MP 2 MAIN COMPUT

INPUT 6 MAIN HUMVP OUTPUT

INPUT3 6 MAIN COMPUT

BRGTAB 108 BAVGCO TABLES

RESTAB 18 RESTEM TABLES

HUMCOR 6 HUMVP OUTPUT TABLES

HUMDAT 108 HUMVP TABLES

10 3 MAIN BAVCOR COMPUT OUTPUT HUMVP

BRGOUT 3 MAIN BAVCOR RESTEM OUTPUT

INFER 5 MAIN HUMVP COMPUT OUTPUT INTPRT

BRGIN 10 MAIN BAVCOR RESTEM COMPUT OUTPUT

OUTR 6 MAIN OUTPUT

BARPRS 3 MAIN COMPUT OUTPUT INTPRT

HUMIDV 3 MAIN HUMVP COMPUT OUTPUT INTPRT

INTOUT 12 COMPUT OUTPUT INTPRT

TABVAL 75 COMPUT OUTPUT TABLES MAIN

TABLES

42
A3. Computer Storaqe Needed By Subprograms

Storage

Subprogram Lines of Code Code Data

MAIN 239 383 128

READIT 387 586 144

ERROR 52 104 164

RAVCOR 61 167 41

RESTEM 26 57 36

QUAD 71 193 36

HUMVP 84 236 73

COMPUT 122 192 83

OUTPUT 125 196 404

DFFD 129 194 54

INTPRT 22 24 40

TABLES 262

Total 1580 2138 1203

43

APPENDIX B

GRAPHS FOR CONVERTING

HYGROMETER READINGS TO HUMIDITY

45
90 100

46
47
10' J.U • '

1 1

j

: > ! 1 i

j

1

|

i

j

! ! >_! • I i | ;

i |

- j'r i r

! !_j_i_j .. Li_l.i ! L

:

. j i.La

1 it ''.

' T

Q"

;' \- -!"-P,

j

:

: 1-4 H-i- r;-rr!-| : ."K I ; v i-

- ihzb-

-

: -r ; -' -

.. !~j-|4-j . -'--:

!-] [ —

j —• —j —

{-_| —5. -j- :t'

48
10) ! !

1

'

i

|

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51
NBS-114A (REV. 7-73)

U.S. DEPT. OF COMM. BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO. NBS TN 9562. Gov't Accession

No.

3. Recipient's Accession No.

4. TITLE AND SUBTITLE 5. Publication Date FORTRAN Program To Determine Length of Gage Blocks

Using Single Wavelength Interferometry

September 1977

6. Performing Organization Code

7. AUTHOR(S)

Ruth N. Varner

8. Performing Organ. Report No.

9. PERFORMING ORGANIZATION NAME AND ADDRESS

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, D.C. 20234

10. Project/Task/Work Unit No.

11. Contract/Grant No.

12. Sponsoring Organization Name and Complete Address (Street, City, State, ZIP)

Same as Item 9

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15. SUPPLEMENTARY NOTES

16. ABSTRACT (A 200-word or less factual summary of most significant information. If document includes a significant

bibliography or literature survey, mention it here.)

A description of a computer program which computes the length of a gage block

from a process using single wavelength interferometry is given. The computer

program has been written in American National Standards Institute FORTRAN,

with emphasis on making it as machine-independent as possible. A sample of

input and output is given.

17. KEY WORDS (six to twelve entries; alphabetical order; capitalize only the first letter of the first key word unless a proper name; separated by semicolons)

FORTRAN computer program; gage blocks; interferometry

18. AVAILABILITY [Xj Unlimited

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