Laser doppler speed and length measurement system

The Laser Doppler Velocimeter is a high precision, high repeatability, intelligent measurement equipment used for precise speed control, precise length control, elongation, mass flow control, shearing and slitting control, and inkjet printing control.



In related industrial automation production, precise length and speed measurements and control are necessary to optimize the production process. Due to the “non-contact” measurement characteristics of the Laser Doppler Velocimeter, there is no wear and tear, which can not only minimize the maintenance cost of the production line, but also significantly improve the reliability of the assembly line, improve production efficiency and product quality, ensure accurate product specifications, and greatly reduce production cost can improve the company’s competitive advantage.

Application of Laser Doppler Velocimeter


-Bar double-length flying shear precise measurement and control system

-Optimized shearing of hot rolling mills

-Cold rolling mill second flow rate measurement

-Synchronized control of slitting speed

-Finishing machine elongation speed measurement

-Steel pipe speed and length measurement

-Profile extruder cut to length



-Aluminum, steel and other metals

-Paper and corrugated paper

-Plastic film and tape

-Wire and Cable

-Building materials and packaging

-Various pipelines


Technical features


Laser Doppler Velocimeter

① Adopt all-fibre solution, miniaturization;

② Adopt high-precision high-speed AD sampling, high-speed FPGA solution, high precision, and low noise;

③ Use the infrared 1550 nm band light source that is safe for human eyes;

④ Direction automatic detection can measure “0” speed

⑤ Accurate measurement on almost any surface

⑥ Anti-electromagnetic interference, stable and reliable


Laser Doppler Velocimeter Used in the Metallurgical Industry


1. ZK-D-SC/H/L series. The type of Laser Doppler Velocimeter is suitable for the manufacture of various metal products such as bars, tubes, wires, plates, strips, hot rolling, cold rolling, etc., real-time online accurate measurement of speed and length, and can measure 1000 ℃ high-temperature billet.

2. ZK-D-SL1500, dedicated to the continuous casting production line, can measure 1000 ℃ high-temperature steel billet, adapt to lower speed measurement, and adopts automatic light intensity gain function for the surface of iron oxide scale, the measurement accuracy can reach ±0.1%.



In the Cable and other industries


ZK-D/S-W300 measures cables of various outer diameters and shapes, including stranded wires, crimped wires, etc., the measurement accuracy can reach within 0.03%, and the minimum diameter of 0.25mm optical fibre can be measured.


laser surface velocimeter


Train speed measurement and train positioning


1. ZK-D-RT500-NS can realize speed measurement in the range of 0-160km/h, and the minimum speed measurement can reach 0; it is suitable for speed measurement and positioning of low-speed rail trains such as subways and urban rails.

2. ZK-D-RT500-HS can realize speed measurement in the range of 0-400 kilometres, and the minimum speed measurement can reach 0; it is suitable for high-speed speed measurement and positioning such as high-speed trains.

3. ZK-D-RT500-SS can realize speed measurement in the range of 0-1100 kilometres, and the minimum speed measurement can reach 0; it is suitable for speed measurement and positioning of ultra-high-speed maglev trains.


Advantages of Laser Doppler Velocimeter


1. Pulse-triggered camera for visual defect recognition

While the laser Doppler velocimeter measures the speed and length of the object online, the editable pulses sent by the velocimeter are used to trigger the camera to collect images. No matter how the speed changes, it will ensure that a clear image of the surface of the object to be measured is collected in equal proportions. achieve defect identification.


2. Speed and position information such as laser coders are provided

The laser Doppler velocimeter can accurately give accurate speed and position information, and the text patterns, logo marks, two-dimensional codes, etc. processed by the editable pulse-driven laser coding machine have high precision, and the processing effect is uniform.


3. Instantaneous speed measurement: ultra-fast sampling frequency, 50,000 times/second

ZK-S- InstantaneousSpeed This type of speedometer is suitable for instantaneous speed measurement, the sampling frequency is 50,000 times per second, the sampling time is as high as 0.02ms once, the maximum instantaneous speed of 300m/s can be measured, and multiple pulses can be output, which can be used in a very short time. It measures the instantaneous speed of a high-speed moving object with a length of only a few centimetres.

For example, cylinder measurement, piston, Hopkinson rod, and other instantaneous speed measurements


4. Elongation rate difference measurement


Technical parameter


Minimum measurement speed (m/min): 0

Maximum measurement speed ( m / min ): 2 0 0 0 0

Measurement unit: m/s, m/min, km/h

Accuracy: better than 0.05%

Repeatability error: better than 0.02%

Direction detection: direction automatic detection

Supply voltage: 20 ~ 28V DC

Power consumption: 1 1 W

Protection class: IP 6 6

Temperature range: – 20 ℃ – 50 ℃

Anti-electromagnetic interference level: standard four

Dimensions (mm): 2 0 1 * 1 3 1 * 7 6

Clear mode: high level, low level, rising edge, falling edge clear

Signal output: AB pulse, RS422, RS485

Industrial Agreement: Modbus


Laser Doppler Velocimeter for Steel Bar Multi-Lengths Flying Shear Precise Measurement And Control >>>


Metallurgical Intelligence
Change the way of manufacturing

Save labor, improve working environment, improve efficiency, reduce error rate and save cost!

Металлургический интеллект
Изменить способ производства

Сэкономьте труд, улучшите рабочую среду, повысьте эффективность, уменьшите количество ошибок и снизьте затраты!