Method for measuring stain on optical lens

Abstract

The invention relates to a method for measuring stain on optical lens, a photoelectric signal detection part is composed of an infrared LED light source, a detector, an optical filter and an installation support. The infrared LED light source is arranged at the rear part of the lens to be detected in an optical device through a fixed support, the emission direction points at the lens; the detector is fixed at the rear part of the lens to be detected through the fixed support; the optical filter is pasted at the front end of the non-point source of the detector, so that the interference of stray light can be removed; a measure control circuit comprises a one-chip microcomputer, a light source drive circuit, a preposed amplification circuit, a filter circuit, a signal demodulation circuit, an analog to digital conversion circuit, a data output circuit and a memory circuit. The backscattering signals received by the detector are subjected to circuit amplification and treatment, the central processor determines the pollution extent on the lens face, and when the lens surface pollution extent exceeds early warning threshold value, the alarm signal is output to alert the requirement forcleaning the lens. The method for measuring stain on optical lens is used for monitoring lens surface pollution extent with outfield on-line operation, and provides the guarantee for normal operationof system.

Description

technical field [0001] The invention relates to the application field of optical instruments, and is a device for automatically monitoring surface pollution of optical lenses based on light backscattering theory, and is suitable for lens pollution measurement of optical instruments operating on-line in an external field. Background technique [0002] At present, many optical instruments are installed and used in the field for online measurement in fields such as meteorology, environmental protection, ecological flux, and optical communication. The ensuing problem is: because the optical lens is exposed to the external field, it will be polluted by dust or other pollutants, the cleanliness of the lens mirror will decrease, and the transmittance will decrease, resulting in weakened received or emitted light intensity, which will affect the measurement. As a result, in severe cases, the instrument may not work properly. At present, there is no effective method to automatically...

AI Technical Summary

Problems solved by technology

[0003] The problem solved by the present invention is: an optical lens pollution measuring device, which can judge whether the optical instrument lens is polluted by measuring the intensity change of the backscattering of light, and provide an alarm when the pollution is serious, and inform that cleaning and maintenance are required

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