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Smart LDV Ⅲ MODEL 8743 / 8743-S

Smart LDV Ⅲ


MODEL 8743 / 8743-S

便捷易用的激光多普勒测速仪,用于高重复性,高精度流体速度测量。

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

应用领域

  • Aerodynamic and hydraulic property measurements in wind tunnels or in water channels
  • Measurements in combustion, rotating equipment
  • Measurement requiring high time-resolution
  • Turbulence measurements
  • PIV accuracy verification

技术指标

测量指标
速度测量范围 -40 m/s to 260 m/s
(f=400 mm, Model 8743-S)
Optical System
激光器 Laser Diode λ= 660 nm, 60 mW
透镜焦距 150 mm, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm
测量体积 0.13 mm x 1.3 mm (f= 200 mm)
测量方法 Back scatter / Forward scatter (Option)
探头尺寸 Ø 61 mm x 345 mm
频移量 Model 8743:without frequency shifter
Model 8743-S:0.01 to 10 MHz
供电 AC100-240 V
信号处理器
信号处理 8bit FFT (512, 256, 128 point)
频率带宽 1 kHz to 40 MHz (8 ranges)
最大数据率 60,000 speed data/sec (depending on measurement condition)
有效性判定 O to 1 V, Pulse, Alarm
接口 USB3.0
Software
最大数据数目 100,000
实时监控 Burst waveform
Burst spectrum
Velocity histogram
分析功能 Mean flow velocity, Turbulent intensity,
Skewness factor, Flatness factor
Velocity histogram, Time-series display
数据输出 CSV format
支持的操作系统 Windows 10 (64位), 日文 / 英文

技术指标可能变更恕不提前通知

可选项

  • CORNER CUBE MIRROR
  • TRAVERSE SYSTEM
  • SEEDING GENERATOR
  • TRACER PARTICLES
  • SAFETY GOOGLES

工作原理

Laser Doppler Velocimeter (LDV) detects Doppler shift frequency of the scattering light of particles in the fluid and calculates the velocity of the particles (fluid).

      model_8743_8743-S_prin01
model_8743_8743-S_prin02
model_8743_8743-S_prin03
  • A high and low intensity fringe (an interference fringe) is formed at the intersection of two laser beams.
  • When a particle passes the fringe, intensity of the scattering light from the particle fluctuates according to the intensity of the fringe.
  • This intensity fluctuation is detected by a photomultiplier as a Doppler signal.
  • The velocity is calculated from the Doppler signal frequency and the fringe spacing.

测量结果实例


  • CYLINDER WAKE FLOW MEASUREMENT IN A WIND TUNNEL
         model_8743_8743-S_ex01       model_8743_8743-S_ex02
  •  MEASUREMENT RESULT EXAMPLE
model_8743_8743-S_prin01
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