Heating coil laser rangefinder diffuse reflection problem
Usually in order to reduce the error, those laser rangefinders will be measured at the end of a reflective surface, in order to reduce the error caused by diffuse reflection, that those snipers use telescopic laser rangefinders in the end how to overcome this problem? Laser rangefinders work on the same principle as sonar, but the signal from the reflected light will be easily interfered with by other wavelengths and intensities of light in the environment? Humidity sensor probes, stainless steel heaters, PT100 sensors, fluid solenoid valves, cast aluminium heaters, heating coils
The detection device of laser rangefinder (pulsed) generally uses avalanche photodiode, which is only sensitive to a specific wavelength of light, the wavelength match then very small light intensity can be detected by it, the wavelength does not match, even if the light intensity is very large, it can not be detected. The laser happens to have the characteristics of good monochromaticity, commonly used wavelength of 905nm, so the signal of receiving the reflected light is not easy to be interfered with by other wavelengths and intensities of light in the environment.
In addition:
There are two commonly used schemes for laser ranging: the pulse method and the phase method.
The phase method measures the distance by measuring the phase deviation of the returned wave, and this needs to be matched to the target, which is what you call a reflective surface on the measured end, in which case the rangefinder has less transmitter power.
The telescopic laser rangefinder used by snipers generally uses the pulse method, that is, a pulse is emitted, the clock starts, and the clock stops after the reflected pulse is received, to achieve the purpose of measuring the distance. In this case, there is no co-operation with the target, by diffuse reflection of light wave energy loss is very serious, but generally does not affect the measurement. The reason is as mentioned earlier. Generally increase the transmitter power of the rangefinder to make some compensation.
