Portable Total Hemispherical Emittance
Measurement System PM-E2

Measurement section
with blackbody furnace, andIntegrating sphere detector
attachedOperation anddisplay section1

Measurement Principle
Measurement procedure①High emissivity sample②Low emissivity sample③SampleεIntegrating sphere
Sample①High emissivity
高半球放射率基準サンプル
sampleH

εhBlackbody furnace
light source
Diffuse incidence
Diffuse reflection③Sampleサンプル

εs②Low emissivity

低半球放射率基準サンプル
sampleεlDetector

Concept of measurement section

LVVhVsVl

Measurement principle2

Characteristics PM-E2
・ High accuracy measurement of total hemisphericalemittance.
・ Measurable from small size sample to large panel.
・ Simple operation, small size, light weight, and cheap.
・ Shortening of the measurement time.
・ Evaluation data by calorimeter method(isas).

3

Main Specification
SystemSystem components

・Measurement system- Blackbody furnace : 330K
- Integrating sphere (diameter: 30mm, Gold plate inner surface)-Thermopile sensor : wavelength range 0.6~42μm (Cover95 % of the total emissive power of the ideal blackbody at 300K)
・Data acquisition system- Hemispherical total reflective intensity

Measurement method
Uncertainty

Total hemispherical emittance・Agreed within ±0.05 (Total hemispherical emittance)
・Repeatability : 0.02 (Total hemispherical emittance)
Around 2~5minutes
・Low emissivity sample: Deposited Gold εL=0.05@293K
or Deposited Al tape・High emissivity sample: Black Kapton εH=0.85@293K

Measuring time
Reference sample

Power source
Dimension (Weight)

AC100V with adapter (+ DC12V1A)・Operation section :W82×H32×D145mm (0.2kg)
・Measurement section : W60×H74×D125mm (0.7kg)
・Measurement window : diameter 10mm4Measurement Condition
・The measurement should be performed at a stable room
temperature (20℃ or more). And the air conditioning wind
does not hit the measurement section and samples directly.
If there is convection etc, it is recommended to measure in a
simple booth.
And when the room temperature is 15°C or less, please wrap
the measurement section with thermal insulation (Fig.A).
・It is recommended to measure about 1 hour after turning on
the power (after 2 hours if possible).
・Please attach a thin sample (Tape, Solar cell) to a copper
plate or Al plate with a thickness of 0.5 mm.

5Measurement Preparation 1
A. Small size sample (Coating, Metal, Cover glass, Solar cell, etc.)
・ Three samples of high and low reference sample and measurement
sample are arranged vertically on the insulating board (Fig.1).
・ Set the Measurement section on the three samples and make themisothermal(Fig.2).

AB

Fig.1

Fig.2

A : High & Low reference sample
B : Measurement sample
6Measurement preparation 2
B. Large size sample (Solar cell panel, Equipment, etc.)
・Set high and low reference samples on a large panel, place theMeasurement section on them and isotherm.
BA

A ： High and low reference samples
B ： Large size panel

Fig.A7

Measurement Procedures① Calibration of the high and low reference samples
High sample (εH = 0.85) Low sample (εL = 0.05)② Check of the high and low reference samples
εH = 0.85±0.01, εL = 0.05±0.01
Yes, go to ③, No, go to ①
At the start of measurement, it is recommended to repeat ①＊and ② about three times.
③ Sample measurement
Please check measurement result. Rerun ② and ③＊ In the case of a metal film deposited polymer film
Depending on the complex absorption characteristics andhygroscopicity of the polymer film, the value of ε may notbestable.
At that time please heat the sample at about 60 ℃ for about
5 minutes with a dryer etc.

8Uncertainty PM-E2

・Influence by the temperature difference of

0.02 underlight source and sample (Against Kirchhoff low)・Measurement method of the total hemispherical
0.03 underemittance by the integrating sphereCross check of PM-E2 and calorimetric method
Samples

PM-E2Au mirror
Graphite sheet
Deposited Al Upilex25R
Germanium
Deposited Al Upilex75R
Black paint

0.05
0.33
0.54
0.64
0.720.83

calorimetric method
@293K
0.03
0.29
0.57
0.69
0.71
0.77

ε Measured by Portable System

10.8
0.6
0.4

Au Mirror
HOGS
7 UPILEX-S/Al
12 UPILEX-S/Al
25 UPILEX-R/Al
50 UPILEX-R/Al
75 UPILEX-R/Al
250 Teflon/Al
Black Paint Z306

0.2
000.2

0.4

0.60.8ε Measured by Calorimetric Method1Comparison with Other Instruments

SampleCalorimetric(isas)＊
H

Deposited Al
0.57@20℃
Upilex25RDeposited Al
0.68@20℃
Upilex50R

PM-E2
H

0.56-0.58@27℃
0.67-0.69@27℃

TESA2000
HTSS-5X
ND&S
AERD
N

0.66

0.64-0.66

0.59-0.64

0.77

0.74-0.77

0.72-0.75＊Calorimetric method is reference measurement method.

Delivery Performances
1
2
3
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5
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78

JAXA isas
PanasonicNTspace
Hokkaido University
ToshibaNagoya University
Korea Aerospace
Research InstituteAsahi Glass C

2011
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2012
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2014
2016