ROUGHNESS METRE Russian patent published in 2009 - IPC G01B11/30 G01N21/88 

FIELD: physics; optics.

SUBSTANCE: invention relates to devices for measuring surface roughness. The roughness metre has a light emitter and a reflected signal photodetector. The light emitter is a laser and the reflected signal photodetector is a photodiode. The roughness metre also has devices for defocusing the light beam incident on the analysed surface and focusing light reflected by this surface, an amplifier for amplifying signal from the photodiode, comparator, AND circuit, binary pulse counter, pulse decoder, memory storage for standard codes, digital comparison device, display device. The signal from the photodiode is transmitted to the amplifier, from the output of the amplifier to the comparator input, from the comparator output to the AND circuit, then to the input of the binary pulse counter, further to the input of the decode, from the output of the decoder to the input of the digital comparison device where signals from the memory storage for standard codes are also transmitted at the same time, and from the output of the digital comparison device to the input of the display device.

EFFECT: wider operational characteristics of the roughness metre.

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