Usually in order to reduce errors, laser rangefinders will be placed on the measured end of a reflective surface, to reduce the diffuse reflection of the formation of errors, snipers with a telescopic laser rangefinders how to overcome this problem?It works in much the same way as sonar, but can signals that receive reflected light be easily interfered with by other wavelengths and intensifies of light in the environment?
Laser rangefinder (pulse) detection device generally used avalanche photodiode, it is only sensitive to a specific wavelength of light, wavelength matching if very small light intensity can be detected by it, wavelength mismatch, even if the light intensity is very large, can not be detected.The laser just has the good monochromatic characteristic, the commonly used wavelength is 905nm.So signals that receive reflected light are not simply interfered with by other wavelengths and intensives of light in the environment.
There are two kinds of laser ranging methods commonly used: pulse method and phase method.
The phase method measures the distance by measuring the phase deviation of the returned wave. This requires the cooperative target, which is said to put a reflection surface on the measured end. In this case, the range finder emits less power.
Snipers with telescopic laser rangefinder is generally used by the pulse method, that is, to announce a pulse, start timing, receiving the reflected pulse stop timing, achieve the purpose of ranging.In this case, when there is no cooperative target, the loss of diffuse reflected light wave energy is very serious, but generally does not affect the measurement.The reasons are stated above.Generally, the transmitting power of rangefinder will be increased to make certain compensation.