Infrared spirit test method and system with curve drafting function

Abstract

The invention discloses a method and a system with a curve drawing function for testing alcohol through infrared light. The system comprises a microprocessor unit, a pulsating light source driving circuit, a parabolic reflecting mirror, an infrared light source, an air chamber, a pack, an infrared detector, a signal amplification processing circuit, an A / D conversion circuit, a wireless printing module, and a GUI display system. A square-wave pulse is produced through a microprocessor; a driving circuit is input to drive the infrared light source; infrared radiation rays are absorbed within the range of a gas characteristic absorption line after infrared light enters the air chamber; the attenuated infrared light passes through a narrow-band pack, projects on the infrared detector, and isconverted into an electric signal to be sent into the signal amplification processing circuit; the electric signal is converted into a digital signal through the A / D conversion circuit to be sent into the microprocessor; and the concentration of alcohol is obtained through calculation. The microprocessor sets a certain sampling time interval through a timer, converts acquired data into a concentration value, and then performs real-time display on a graphical user interface display system in a form of a curve.

Description

technical field [0001] The invention relates to an infrared alcohol testing method and system, in particular to an infrared alcohol testing method and system with a curve drawing function. Background technique [0002] With the rapid development of the automobile industry, traffic accidents caused by drunk driving are increasing day by day, seriously threatening the safety of people's lives and properties. In the handling of traffic accident cases, it is necessary to detect the BAC (Blood Alcohol Concentration) of the perpetrator of drunk driving, that is, the blood alcohol concentration, as the evidence presented in court. Law enforcement officers mainly use non-invasive detection to carry out evidence breath alcohol testing (Evidential Breath Alcohol Testing) on ​​drivers. Radiation within a specific group of wavelengths is selectively absorbed, and the intensity of the absorption is related to the concentration of that compound. According to this method, the driver's br...

AI Technical Summary

Problems solved by technology

The main disadvantage of this technology is that it adopts a mechanical modulation method, and the chopper needs to be driven by a motor to rotate, which makes the optical components large in size, heavy in weight, strong in interference, and reduces its life and reliability; on the other hand, the test results cannot be displayed in real time. Easily distracted by oral alcohol

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