1. Laser length measurement
Precision length measurement is one of the key technologies in the precision 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 mainly depends on the monochromacy of light. The laser is the most ideal light source, it is 100,000 times purer than the best monochromatic light source (Krypton-86 lamp) before. Therefore, the laser length measurement has a large range and high accuracy. According to the optical principle, the relationship between the maximum measurable length L of monochromatic light and the δ of wavelength λ and spectral line width is L=λ2/δ. The maximum length of the Krypton-86 lamp can be measured is 38.5 cm, and for longer objects, it needs to be measured in sections to reduce the accuracy. If a HeNe gas laser is used, it can measure up to tens of kilometers. Lengths within a few meters are typically measured with an accuracy of 0.1 microns.
2. Laser ranging
It works the same as radio radar, after a laser is fired at a target, its round-trip time is measured, and then multiplied by the speed of light to obtain the round-trip distance. Due to the advantages of high directionality, high monochromaticity and high power of laser, these are very important for measuring long distance, determining the target orientation, improving the signal-to-noise ratio of the receiving system, and ensuring the measurement accuracy, so 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 target orientation, transportation speed and acceleration, etc., and has been successfully used in the ranging and tracking of artificial satellites, such as the lidar using ruby lasers, with a ranging range of 500-2000 kilometers and an error of only a few meters. At present, ruby lasers, neodymium glass lasers, carbon dioxide lasers and gallium arsenide lasers are often used as light sources for laser rangefinders.
3. Laser thickness measurement
Utilize the principle of triangulation ranging, the upper and lower are divided into a precision laser ranging sensor at the top and below of the C-frame, the modulated laser emitted by the laser hits the surface of the object to be measured, through the signal of the linear array CCD is sampled and processed, the linear array CCD camera synchronously obtains the distance between the object under test and the C-frame under the control of the control circuit, and calculates the thickness of the intermediate object to be measured by the data of sensor feedback. Since the detection is continuous, it is possible to obtain a continuous dynamic thickness value of the analyte.
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