Laser sensor with M18*1.5mm metal detection head, 4mm spot size, diffuse reflection detection mode, NPN/PNP NO/NC output mode for selection.

Specification:

Note: The detection range of diffuse reflection laser sensor can be adjusted by the knob (Clockwise rotation for adding distance, anticlockwise rotation for reducing distance).
Dimension (unit: mm):

Wiring diagram:

Tips: Laser sensor for vibration measurement
Using laser sensor for vibration measurement is based on the Doppler principle. The Doppler principle means that if the wave source or the observer receiving the wave moves relative to the medium in which the wave propagates, the frequency measured by the observer depends not only on the frequency of vibration emitted by the wave source but also on the magnitude and direction of the speed of motion of the source or observer. The difference between the measured frequency and the frequency of the wave source is called the Doppler shift. This kind of laser vibration sensor converts the vibration of the object into the corresponding Doppler frequency shift by the optical part during measurement, and converts the frequency shift into an electrical signal by the photoelectric detector. After appropriate processing by the circuit part, it is sent to the Doppler signal processor. The Doppler signal processor converts the Doppler-shifted signal into an electrical signal corresponding to the vibration velocity, which is finally recorded on a magnetic tape. This laser vibration sensor uses a helium-neon laser with a wavelength of 6328 angstroms, uses an acousto-optic modulator for optical frequency modulation, uses a quartz crystal oscillator and a power amplifier circuit as the driving source of the acousto-optic modulator, uses a photomultiplier tube for photoelectric detection, and using a frequency tracker to process the Doppler signal. The advantage of this laser sensor is that it is easy to use, does not require a fixed reference frame, does not affect the vibration of the object itself, and has a wide measurement frequency range, high precision and large dynamic range. The disadvantage is that the measurement process is greatly affected by other stray light.