An ultraviolet power detection range expansion device

Abstract

The invention relates to an ultraviolet power detection range extending device. The device comprises an ultraviolet photoelectrical diode, a signal conditioning module, a differencing amplifying module, a secondary amplifying module, an analog-digital conversion module, a master controller, a comparator and a digital-analog conversion module, wherein the ultraviolet photoelectrical diode is connected with the signal conditioning module; the signal conditioning module is sequentially connected with the differencing amplifying module and the secondary amplifying module through analog signal lines; an output end of the secondary amplifying module is connected with input ends of the analog-digital conversion module and the comparator; output ends of the analog-digital conversion module and the comparator are connected with the master controller; the master controller regulates output voltage of the digital-analog conversion module through a DAC control line; an output end of the digital-analog conversion module is connected with the differencing amplifying module through a bias signal line. A micro-processor acquires the basic intensity condition of ultraviolet power quickly through the comparator, the detection range can be greatly increased, and relatively high precision in the whole range is realized.

Description

Technical field [0001] The invention relates to the technical field of ultraviolet light power measurement, in particular to an ultraviolet power detection range expansion device. Background technique [0002] Ultraviolet rays are electromagnetic waves with a wavelength of 100 to 400 nm. It is divided into: near ultraviolet UVA, far ultraviolet UVB and ultra-short ultraviolet UVC. Among them, the short-wave ultraviolet UVC is absorbed by the ozone layer when passing through the stratosphere of the earth's surface and cannot reach the earth's surface. Generally, the ultraviolet light generated by the ultraviolet lamp or detected by the detection instrument is UVA and UVB. [0003] The principle of ultraviolet photometer detection is to select specific photosensitive elements to make receiving elements according to the specific wavelength of ultraviolet rays. When the receiver is irradiated by ultraviolet rays, the optical signal is converted into electrical signals, which are ampl...

AI Technical Summary

Problems solved by technology

[0004] The existing patent No. CN201610236289.6 discloses a wide-range optical power meter. The technical solution includes a photoelectric detector, a photoelectric signal amplification and analog-to-digital conversion acquisition circuit, a control calculation unit and an optical attenuator. The technical solution Use an optical attenuator to expand the detection range of ultraviolet power. This way of expanding the range will reduce the resolution when the ultraviolet light is weak. When the ultraviolet light is strong, although it can be collected normally, the accuracy will be reduced.

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