Infrared SF6 sensor device relevant to NDIR (Non-Dispersive Infrared Analyzer) and method

Abstract

The invention relates to the technical field of infrared sensors, in particular to an infrared SF6 sensor device relevant to an NDIR (Non-Dispersive Infrared Analyzer) using an infrared spectrum absorption principle and a method. The infrared SF6 sensor device comprises an optical cavity, an MEMS (Micro-Electromechanical System) light source, an infrared detector, a detector circuit board and a main circuit board, wherein the optical cavity comprises an inner light tube, a breathable film and a jacket shell; the sensor optical cavity is of a convective diffusion structure and a double-layer breathable film structure; a main circuit board circuit comprises a power supply management circuit and a sensor infrared light source driving circuit; the sensor infrared light source driving circuit adopts a constant-power driving way; the main circuit board is provided with an output interface UART, an RS-485 serial communication circuit and a 4-20mA transmitter circuit. The device adopts a convective diffusion design, so that the response time is short; the double-layer breathable film is designed with short response time, so that the moisture interference capability is enhanced; the constant-power driving circuit is adopted, and an instrument amplification form is adopted for detector signal amplification, so that the long-term stability of analogue signals of a module on hardware is enhanced; various output interfaces are provided, so that the compatibility is high.

Description

[technical field] [0001] The invention relates to the technical field of infrared sensors, in particular to a related NDIR infrared SF6 sensor device and method utilizing the principle of infrared spectrum absorption. [Background technique] [0002] With the development of today's technology, SF 6 The application fields of gas continue to expand, such as: electric power, environmental protection, metallurgy and microelectronics and many other fields. In the electric industry, SF 6 Mainly used as electrical insulation medium and arc extinguishing agent. SF 6 As an insulating medium, while ensuring the safe and reliable operation of electrical equipment, it can make the equipment miniaturized and reduce the equipment cost. At present, most high-power transformers, high-voltage circuit breakers, gas-insulated combined switchgears, and transformers use SF 6 As an insulating medium, it greatly reduces the damage caused by spark discharge and arc to the equipment. In additio...

AI Technical Summary

Problems solved by technology

[0006] In view of the problems of the above SF6 sensor module such as small working temperature range, poor resistance to moisture, zero drift and single customer interface, corresponding improvements have been made in structural design and circuit design, and a working temperature range is designed. NDIR infrared SF6 sensor device and method with wide range, reduced moisture interference, fast gas diffusion speed, stable performance and providing multiple customer interfaces

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