MODEL 2521
SIGNAL PROCESSOR

Non-Contact Laser Doppler

CARRYING DOPPLER

Battery-powered, Compact,and Easy to CarryHigh accuracy on length measuring
include ”0” Velocity
Highly-stabilized performance withDigital technology

Outline
The "CARRYING DOPPLER" MODEL2521 is a compact Laser Doppler Measurement System which isavailable for portable use by battery. This instruments are much half as smaller and lighter as theconventional Laser Doppler System.
By the internal battery power the measurement is operated for more than 3 hours, and also for more than 15hours by using the external battery. This feature makes it possible to operate the velocity and length
measurement in the powerless area.
And also the features of the high-speed initial velocity and interpolation for lack of signals enable
MODEL2521 to operate the high-speed and stable measurement.

Feature1. Available for portable use of measurement outdoors or in the powerless area by battery.
2.Easier to carry and larger to measure on the range and objects.
3. High measuring features and functions by reasonable price.
4. Non-contact measurement does not have any interference or affection on measured objects such as slip orfriction, therefore this is available for various kinds of object.
5. Has the function of the signal interpolation helpful for the stable measurement.
6. Available for the real-time data obtaining through a USB interface.

Specifications
Doppler Sensor MODEL 1521

Signal Processor MODEL 2521

MethodMODEL 1521
As standard
L=300
Accuracy
Power supply
Laser power
Beam spot
Dimensions,
WeightInput frequency
rangeｍｍ

Laser Doppler system: Back-scattering differential type
Focus distance
Optimal position at 300 ± 20 mm
Measurement range
0±1400m/min OR -40～+3200m/minWithin ±0.2％ OR ±0.1m/min
Supplied from MODEL 2521
Class 3B : 20mWMAX，CW，Laser Diode 690nm
Approx.0.5mmX4mm(oval), Collimated60(W)x30(H)x120(D), excluding projections
Approx, 0.3kg

Other Functions
interpolation： When Doppler signal is missed, the velocity andlength are interpolated by the value before missed timing.
USB I/F ： Parameter settings 、 real time output of velocity andlength
Memory function: Panel preset function allows 4 different settings tobe recalled and stored in the panel.
:100data of velocity and length can be stored.
PowerLithium polymer battery（60Wh） built-in
continuous use time: Over 3 hours （ at fullcharged）
Charging time: about 3 hours, trickle charge issupported.
By using provided AC adaptor, available forAC100-240V operation and battery-charging.

Dimensions,
Weight250(W)x99(H)x300(D), excluding projections
Approx, 3.2kg

LOW ： 0±1400ｍ/min
HIGH ： -40～+3200ｍ/min
Display
1Digital indication in 8decimal digits
Min.
0.001(m/min)
resolution
or 0.00001m/s
Unit
m/min or m/s
Cycle
0.1sec or 1sec
SMA,WMA,EMA,
Averaging
2 to 4096times moving averageInitial velocity catch time
Within 5ms
0±4V，16bit D/A output
Velocity
OutputFull scale adjustable
D/A output
Voltage
Refresh rate
2ms to 1000ms
AccuracyWith in ±0.5％ at full scale.
SMA,WMA,EMA,
Averaging2～4096times moving average
LengthMeasurement ±0.0001m to 9999.9999m
Measurement
range
0.1mm resolution
1Digital indication in 8decimal digits
Display
Indication rate0.1sec OR 1sec
Pitch pulse
0.10 to 100.0mm,
0.01mmresolution
OutputA，B 90°phasedifference output.
・Open collector output
・ RS-422complianced difference
output.
Gatefor Length
measuring.

Material signal or external gate
input signal.
Signal slope: selectable.

Options
Carrying case
Solid and lightaluminum case.
Very convenient tocarry and operate theportable CARRYINGDOPPLER on themeasuring site.

Sensor plate
Plate to set a sensor
on a tripod.