Diffuse reflection problem of heating coil laser rangefinder
Usually, in order to reduce errors, those laser rangefinders will have a reflective surface on the measured end to reduce the error caused by diffuse reflection. So, how did the telescopic laser rangefinders used by snipers overcome this problem? The working principle of a laser rangefinder is similar to that of sonar, but will the signal of the reflected light be easily interfered with by other wavelengths and intensities of light in the environment? Humidity sensor probe, stainless steel electric heating tube, PT100 sensor, fluid solenoid valve, cast aluminum heater, heating ring
The detection device of laser rangefinders (pulse type) generally uses avalanche photodiodes, which are only sensitive to specific wavelengths of light. If the wavelength matches, even very small light intensity can be detected by it. If the wavelength does not match, even if the light intensity is large, it cannot be detected. Laser has the characteristic of good monochromaticity, with a commonly used wavelength of 905nm. So the signal of receiving reflected light is not easily disturbed by other wavelengths and intensities of light in the environment.
In addition:
There are two commonly used laser ranging methods: pulse method and phase method.
The phase method measures distance by measuring the phase deviation of the returned wave, which needs to be coordinated with the target, which is the reflection surface on the measured end. In this case, the transmission power of the rangefinder is relatively small.
The telescope type laser rangefinder used by snipers generally uses the pulse method, which sends out a pulse to start timing and stops timing after receiving the reflected pulse, achieving the purpose of ranging. In this case, when there is no cooperative target, the energy loss caused by diffuse reflected light waves is very serious, but generally does not affect the measurement. The reason is as mentioned earlier. Generally, the transmission power of the rangefinder is increased to compensate for this.
