METHOD TO DETECT DUST DEPOSIT ON PRINTED CIRCUIT BOARDS OF RADIO ELECTRONICS EQUIPMENT Russian patent published in 2014 - IPC G01N21/94 

FIELD: measurement equipment.

SUBSTANCE: method to detect dust deposit with account of moisture level on printed circuit boards of radio electronics equipment consists in the fact that light pulses are periodically emitted by two light diodes with wave length λ₁=565 nm (to take into account the level of dust deposit) and two light diodes with wave length λ₂=930 nm (to take into account the level of moist dust deposit) and are received as reflected from three plates. At the same time the first plate has an artificially applied maximum level of dust deposit, the second one is in a tight body with artificially created maximum level of dust deposit with the limit threshold of moisture, and the third one is a reference plate, a photosensor. Besides, the photosensor first records the light pulses of two light diodes with wave length λ₁, then light pulses of two light diodes with wave length λ₂, arriving at the angle to the optical axis of radiation, comparing them by means of subtraction, as a result of which the higher level of dust deposit is detected, as well as availability of moist dust deposit.

EFFECT: provision of indication of higher level of dust deposit, disconnection of radio electronics equipment as the limit threshold of moist dust deposit is achieved.

3 dwg