Single ultraviolet phototube optical detector for fire detection at high temperature

Abstract

The invention discloses a single ultraviolet phototube optical detector for fire detection at high temperature. The single ultraviolet phototube optical detector comprises a power filtering conversion circuit, an ultraviolet sensing circuit, a temperature compensation circuit, a window contamination detection circuit, a CPU (central processing unit) interface circuit, a serial port communication circuit and an indicator light circuit. Information of operation state and the like can be transmitted to an upper computer timely by serial port communication. A single ultraviolet photounit adaptive to ultraviolet light of flame is used, so that infrared radiation interference of a power chamber at high temperature is avoided, fire detection is highly accurate, and anti-false-positive capacity is high. Temperature compensation is performed by CPU sampling and calculation, time detectivity is consistent at wide temperature, and intelligent degree is increased remarkably. The condition that window glass is contaminated by oil in the power chamber can be detected by the window contamination detection circuit and reported to the upper computer.

Description

technical field [0001] The patent of the present invention relates to an optical detector, more specifically, to a single ultraviolet photoelectric cell optical detector for detecting fire in a high-temperature environment. Background technique [0002] In the current fire warning system commonly used in special vehicles, the power cabin mainly uses the principle of heat conduction to detect fire. For example, a line flame sensor is used, which has a small fire sensitive area and low sensitivity. With the progress and development of science and technology, the application field of optics is becoming wider and wider. According to relevant abstracts, the existing optical detectors are mainly divided into two categories: one is infrared light detectors, and the other is ultraviolet light detectors. However, due to the complexity of the environment in the power compartment of special vehicles, infrared photosensitive components are susceptible to false alarms due to the thermal ...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the environment in the power compartment of special vehicles, infrared photosensitive components are susceptible to false alarms due to the thermal radiation generated by the engine, etc.

In addition, temperature has a great influence on the sensitivity of photosensitive components. The lower the temperature, the higher the sensitivity. For the wide temperature range of -40℃~+105℃, the existing optical detectors cannot achieve the detection sensitivity. consistency

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