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[Chemical Knowledge]：Demystifying the working principle of the FID detector

Read： 333 Time：20months ago Source：Transform the World with Simplicity

As one of the important tools in analysis technology, FID detector has been widely used in environmental monitoring, industrial product quality detection, medical diagnosis and other fields. It realizes rapid, accurate, sensitive and economical detection and analysis through hydrogen ion detection. So what is the working principle of the FID detector?

1. Basic Principle

The basic principle of the FID detector is to detect organic compounds or hydrocarbons using fluorescence enhancement effect. Inside the FID detector, there is a flame-retardant capillary made of vanilla and nickel alloy, which is heated and ionized by high-pressure hydrogen gas. When the sample to be tested into the detector contains organic compounds or hydrocarbons, these substances will gradually decompose during combustion, and the generated ions will collide with the hydrogen ions inside the FID detector, causing the hydrogen ions to gradually increase.

at the same time, the depth of ion and flue gas collision will make the vanilla and nickel alloy flame retardant capillary wall produce faster electronic recombination, so that the detector wall charge enhancement, produce very strong fluorescence signal, fluorescence intensity and organic compounds or hydrocarbon concentration is proportional to the concentration. Therefore, the detection sensitivity of the FID detector is very high, and the detection accuracy is extremely high.

2. Workflow
The workflow of the
FID detector mainly has two stages: the first stage of the

: the thermal reaction stage-in the thermal reaction stage, the sample to be tested is internally heated, and hydrogen ions begin to collide. Before entering the threshold voltage, the fluorescence signal will not be detected. This process takes about 2.5 seconds. The second stage of

: fluorescence detection stage-after the threshold voltage is reached, the fluorescence signal rises exponentially, the FID detector converts the fluorescence signal into a digital signal, and finally outputs the detection result through the data processing center.

3. application scenarios

FID detector has high sensitivity and high sensitivity to almost all combustible gases, especially suitable for monitoring hydrocarbons, organic compounds and low concentration toxic gases. The main application scenarios include environmental monitoring, such as air pollution monitoring, industrial emission monitoring; product quality testing, such as food, cosmetics, medicine and other fields of quality testing and medical diagnosis.

In general, the FID detector is a fast, accurate, sensitive and economical detection instrument, and its working principle is based on the fluorescence enhancement effect of hydrogen ion detection. This makes the FID detector has a wide range of applications in the environmental, industrial, chemical and pharmaceutical fields.