Laser technology is used for detection work. It mainly uses the excellent characteristics of the laser and uses it as a light source, together with corresponding photoelectric elements. It has the advantages of high precision, large measuring range, short detection time, non-contact type, etc. It is often used to measure length (laser range finder), displacement, speed, vibration and other parameters. Mainly used in the wide range of ranging.
When the object to be measured is irradiated with laser light, certain characteristics of the laser light are changed. By measuring the response such as intensity, speed or type, the shape, physical and chemical characteristics of the test object, and their amount of change can be known. Response types include light, sound, heat, ions, release of products such as ions, neutral particles, and changes in the amplitude, phase, frequency, polarization direction, and propagation direction of reflected light, transmitted light, scattered light, and the like.
Laser technology applied to distance measurement. The basic principle of laser ranging is to shoot a target laser at a speed of C and measure the time it returns. The distance d between the laser and the target is then obtained. That is: d = ct/2 where t - the time interval between the laser emitting and receiving the return signal. It can be seen that the accuracy of this laser ranging depends on the timing accuracy. Because it uses a pulsed laser beam, in order to improve accuracy, the laser pulse width is required to be narrow, and the optical receiver has a fast response speed. Therefore, long-distance measurement of solid-state lasers and carbon dioxide (carbon dioxide detector) lasers with large output power is used as a laser source; gallium arsenide semiconductor lasers are used as laser sources for close-range measurements.
Laser technology is used for length measurement. It can be known from the optical principle that the relationship between the maximum measurable length L of monochromatic light and the wavelength λ of the light source and the spectral line width Δλ is measured with an ordinary monochromatic light source, and the maximum measurable length is 78 cm. If the measured object exceeds 78cm, it must be measured in segments, which will reduce the measurement accuracy.
Laser interferometry. The principle of laser interferometry is to use the characteristics of the laser - coherence - to process the phase change information. Since light is a kind of high-frequency electromagnetic wave, it is difficult to directly observe the change of its phase. Therefore, using the interference technique to convert the phase difference into the change of light intensity makes it easier to observe. The distance between the measured object and the object can be measured in a non-contact manner by using the interference between the reference light of the reference reflection surface and the observation light reflected by the observation object or the interference between the reference light and the light that changes in phase after observing the object. The size, shape, etc. of the object, its measurement accuracy reaches the wavelength of light. Because the wavelength of light is very short, the measurement accuracy is quite high.
Laser technology is applied to radar. Lidars are used to emit laser beams into the air and analyze and process the scattered signal light to obtain the type, number, and distance of suspended molecules in the air. Using short-pulse lasers, they can be observed in time series.
When the object to be measured is irradiated with laser light, certain characteristics of the laser light are changed. By measuring the response such as intensity, speed or type, the shape, physical and chemical characteristics of the test object, and their amount of change can be known. Response types include light, sound, heat, ions, release of products such as ions, neutral particles, and changes in the amplitude, phase, frequency, polarization direction, and propagation direction of reflected light, transmitted light, scattered light, and the like.
Laser technology applied to distance measurement. The basic principle of laser ranging is to shoot a target laser at a speed of C and measure the time it returns. The distance d between the laser and the target is then obtained. That is: d = ct/2 where t - the time interval between the laser emitting and receiving the return signal. It can be seen that the accuracy of this laser ranging depends on the timing accuracy. Because it uses a pulsed laser beam, in order to improve accuracy, the laser pulse width is required to be narrow, and the optical receiver has a fast response speed. Therefore, long-distance measurement of solid-state lasers and carbon dioxide (carbon dioxide detector) lasers with large output power is used as a laser source; gallium arsenide semiconductor lasers are used as laser sources for close-range measurements.
Laser technology is used for length measurement. It can be known from the optical principle that the relationship between the maximum measurable length L of monochromatic light and the wavelength λ of the light source and the spectral line width Δλ is measured with an ordinary monochromatic light source, and the maximum measurable length is 78 cm. If the measured object exceeds 78cm, it must be measured in segments, which will reduce the measurement accuracy.
Laser interferometry. The principle of laser interferometry is to use the characteristics of the laser - coherence - to process the phase change information. Since light is a kind of high-frequency electromagnetic wave, it is difficult to directly observe the change of its phase. Therefore, using the interference technique to convert the phase difference into the change of light intensity makes it easier to observe. The distance between the measured object and the object can be measured in a non-contact manner by using the interference between the reference light of the reference reflection surface and the observation light reflected by the observation object or the interference between the reference light and the light that changes in phase after observing the object. The size, shape, etc. of the object, its measurement accuracy reaches the wavelength of light. Because the wavelength of light is very short, the measurement accuracy is quite high.
Laser technology is applied to radar. Lidars are used to emit laser beams into the air and analyze and process the scattered signal light to obtain the type, number, and distance of suspended molecules in the air. Using short-pulse lasers, they can be observed in time series.
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