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Simple and easy operated LDV (Laser Doppler Velocimeter) for accurate flow velocity measurement with high repeatability.

A Laser Doppler Velocimeter (LDV) measures fluid velocity by utilizing coherence of laser light. It detects the Doppler shift frequency of the scattering light of particles in the fluid and calculates the velocity of the particles (fluid). With a LDV system, non-intrusive measurements without disturbing the measuring object, liquid or gas flow, are achieved. No calibration is necessary and reverse flow measurements at a high resolution is also possible. The LDV system provides the absolute value of the flow velocity with accuracy.
The Smart LDV Ⅲ is a high quality Laser Doppler Velocimeter and compact in design. Absolute velocity measurement with high repeatability is realized with the Smart LDV Ⅲ.

Enhanced receiving sensitivity enabling high data-rate measurement

Up to 60,000 velocity data/sec.

High-speed data transfer by USB3.0

Probe designed as all-in-one, no alignment necessary

Aerodynamic and hydraulic property measurement

Measurement requiring high time-resolution

Comparison with CFD

PIV accuracy tests

Main Unit Specifications
Velocity Range -40 to 260 m/s (f = 400mm, Model 8743-S)
Laser Source Laser Diode: λ=660nm, 60mW
Focal Distance 150, 200, 250, 300, 350, 400 mm
Focal Point Size 0.13 mm x 0.13 mm
Probe Size 61 mm (Dimension) x 345 mm (length)
Shift Frequency Model 8743-S: 0.01 to 10 MHz

Model 8743: without Frequency Shifter

Signal Processor Specifications
Signal Processing System 8 bits FFT (512, 256, 128 points)
Frequency Band 1 kHz to 40 MHz (8 ranges)
Input Doppler Signal 20 mV to 1V
Data Rate 16000 Data / sec
Board Size Full sized PCI board
Max. number of data 100,000
Real time monitor Burst waveform

Burst spectrum

Velocity histogram

Analysis function Mean flow velocity, Turbulent intensity, Skewness factor

Flatness factor, Velocity histogram, Time-series display

Data output CSV format

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