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Application of laser sensor in machinery manufacturing

2019-08-29
The role of laser sensors mainly includes laser length measurement, laser ranging, laser vibration measurement, and laser speed measurement. Non-contact long-distance measurement can be achieved by using the high directivity, high monochromaticity and high brightness of the laser. Laser sensors are commonly used for measuring physical quantities such as length, distance, vibration, speed, and azimuth. They can also be used for flaw detection and monitoring of atmospheric pollutants.

Laser length measurement

Precision measuring length is one of the key technologies in the precision machinery manufacturing industry and optical processing industry. Modern length measurement is mostly carried out by using the interference phenomenon of light waves, and the accuracy mainly depends on the monochromaticity of light. The laser is the ideal light source, which is 100,000 times purer than the best monochromatic light source in the past. Therefore, the laser length measurement has a large range and high precision.

Laser Ranging
Its principle is the same as that of radio radar. After the laser is aimed at the target, it is measured by its round-trip time, and then multiplied by the speed of light to get the round-trip distance. Due to the high directionality, high monochromaticity and high power of the laser, these are critical for measuring the distance, determining the target orientation, improving the signal-to-noise ratio of the receiving system, and ensuring the measurement accuracy. Therefore, the laser range finder It is receiving increasing attention. The laser radar developed on the basis of laser range finder can not only measure distance, but also can measure target orientation, transport speed and acceleration, etc., and has been successfully used for ranging and tracking of artificial satellites.
Laser vibration measurement
It measures the vibration velocity of an object based on the Doppler principle. The vibrometer converts the vibration of the object into a corresponding Doppler shift by the optical part during measurement, and the frequency shift is converted into an electrical signal by the photodetector, and then processed by the circuit part and sent to the appropriate The Puller signal processor converts the Doppler shift signal into an electrical signal corresponding to the vibration speed and finally records it on the magnetic tape. The utility model has the advantages of convenient use, no need of a fixed reference frame, no influence on the vibration of the object itself, wide measurement frequency range, high precision and large dynamic range. The disadvantage is that the measurement process is greatly affected by other stray light.

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