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

FIELD: measurement equipment.

SUBSTANCE: periodically light pulses are emitted by two light diodes with wave length λ₁=565 nm and two light guides with wave length λ₂=930 nm, and a photosensor receives pulses reflected from three plates. The first plate has an artificially applied maximum level of dustiness, 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. 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.

EFFECT: invention provides for indication of higher level of dust deposit and disconnection of radio electronics equipment as the limit threshold of moist dust deposit is achieved.

5 dwg