The laser sensor consists of a laser, a laser detector and a measuring circuit. The laser sensor is a new type of measuring instrument, and its advantages are that it can complete the remote interval measurement without touch, with fast speed, high precision, large measuring range, strong anti-light and electric disturbance ability, etc. When the laser sensor is operating, the laser emitting diode is aligned with the laser transmitter to emit a laser pulse. After being reflected, the laser light is scattered in all directions. Part of the scattered light is returned to the sensor receiver, which is accepted by the optical system and imaged onto the avalanche photodiode. An avalanche photodiode is an optical sensor with an internal amplification function, so it can detect extremely weak light signals and convert them into corresponding electrical signals. A common example is a laser distance sensor, which measures the policy interval by recording and processing the moment between the time a light pulse is emitted and the moment it is accepted back.
Use of laser sensors
The high directivity, high monochromacy, and high brightness of the laser can be used to achieve touchless remote measurement. Laser sensors are often used to measure physical quantities such as length, interval, oscillation, velocity, and azimuth, and can also be used for flaw detection and monitoring of air pollutants.
Laser length measurement
Fine length measurement is one of the key technologies in the fine machinery manufacturing industry and the optical processing industry. Modern length measurement is mostly carried out by using the interference phenomenon of light waves, and its accuracy depends primarily on the monochromacy of light. The laser is the ideal light source, and it is 100,000 times purer than the best monochromatic light source (Krypton-86 lamp) in the past. Therefore, the laser length measurement has a large range and high accuracy.
Laser ranging
Its principle is the same as that of radio radar, after the laser is emitted, its reciprocating time is measured, and then multiplied by the speed of light to obtain the reciprocating interval. Because the laser has the advantages of high directionality, high monochromacy and high power, which are very important for measuring the distance interval, determining the direction and direction, improving the signal-to-noise ratio of the receiving system, and ensuring the measurement accuracy, the laser rangefinder has been paid more and more attention. The lidar developed on the basis of the laser rangefinder can not only measure the range, but also measure the direction, transportation speed and acceleration, etc., and has been successfully used in the ranging and tracking of artificial satellites.
Laser vibration measurement
It measures the oscillation velocity of an object based on the Doppler principle. The Doppler principle states that if the source of the wave or the observer receiving the wave moves relative to the medium of the propagating wave, then the frequency measured by the observer depends not only on the oscillation frequency emitted by the wave source, but also on the magnitude and direction of the speed of the wave source or observer. The difference between the measured frequency and the frequency of the wave source is called the Doppler shift.
Laser velocimetry
It is also a laser velocity measurement method based on the Doppler principle, which is more commonly used by the laser Doppler flow meter (see laser flow meter), which can measure the air velocity of the wind tunnel, the flow rate of rocket fuel, the flow rate of the aircraft jet, the atmospheric wind speed and the size and convergence speed of the particles in the chemical reaction.
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Two directions are detected with one sensor
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Merit:
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Pick the right adhesive! We need to know the importance of adhesives, many people do not pay attention to the selection of adhesives, the natural frequency of the accelerometer is determined by the degree of coupling of the bond, so it is important to choose the right adhesive. The weight of the accelerometer is also what we have to test.
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ifm wins three iF Design Awards 2020
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Ifm flow sensors ensure safety
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