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A fid micro-current amplifier capable of automatic calibration and its calibration method

An automatic calibration and micro-current technology, which is applied in the field of gas chromatograph FID detection, can solve the problems of uncorrectable component errors and uncertainties, and achieve the effect of improving repeatability and accuracy and improving adaptability

Active Publication Date: 2022-04-19
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When in use, the output data is corrected according to the stored test records according to the change of the ambient temperature detected by the sensor; this kind of correction is uncertain and cannot correct the error caused by the drift of the component itself

Method used

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  • A fid micro-current amplifier capable of automatic calibration and its calibration method
  • A fid micro-current amplifier capable of automatic calibration and its calibration method
  • A fid micro-current amplifier capable of automatic calibration and its calibration method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment provides a FID micro-current amplifier capable of automatic calibration. The signal input end of the FID micro-current amplifier is connected to a micro-current source. The micro-current source includes a reference voltage generation circuit, a program-controlled line variable voltage output circuit, a filter circuit and line variable voltage-current conversion circuit.

[0033] The reference voltage generation circuit includes a voltage reference source VR1, a first resistor R1, and a first capacitor C1, and the output voltage of the voltage reference source VR1 is filtered by the first resistor R1 and the first capacitor C1 before entering digital-to-analog conversion The reference voltage input terminal of chip U1.

[0034] The program-controlled line variable voltage output circuit includes a digital-to-analog conversion chip U1 (DAC chip), a high-voltage operational amplifier U2A and a digital control part, and the digital-to-analog conversion chip ...

Embodiment 2

[0048] The present invention provides a method for calibrating the FID microcurrent amplifier described in Embodiment 1, and its flow process is as follows:

[0049] 1) Set the control terminal of the switch Q1 to a high level, so that the switch Q1 is turned on; test and record the basic input current, and the input current at this time is the reference leakage current of the system;

[0050] 2) The control terminal of the switch Q1 is set to a low level, and the digital control part outputs a line variable voltage with a fixed slope according to the required set current and the value of the output capacitor C2 to obtain a continuous output current;

[0051] 3) Through the analog-to-digital conversion part of the chromatograph host, read and record the final output voltage of the output terminal of the micro-current amplifier; three points of 1pA, 10pA, and 100pA are used as test points, and each point is repeatedly measured 2-3 times, and other data Read after stabilization ...

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Abstract

The invention discloses an FID micro-current amplifier capable of automatic calibration and a calibration method thereof. The technical solution adopted by the present invention is: the signal input end of the FID micro-current amplifier is connected to a micro-current source, and the micro-current source includes a reference voltage generating circuit, a program-controlled line-variable voltage output circuit, a filter circuit and a line-variable voltage-current conversion circuit; The reference voltage generation circuit includes a voltage reference source VR1, a first resistor R1, and a first capacitor C1, and the output voltage of the voltage reference source VR1 is filtered by the first resistor R1 and the first capacitor C1 before entering digital-to-analog conversion The reference voltage input terminal of the chip U1; the described line variable voltage-current conversion circuit includes an output capacitor C2 and a switch Q1, one end of the output capacitor C2 is connected to the signal input terminal of the FID microcurrent amplifier, and the other end is connected to the high voltage operation output of amplifier U2A. The invention can realize the calibration of the FID micro-current amplifier under different conditions.

Description

technical field [0001] The invention belongs to the field of gas chromatograph FID detection, in particular to an FID micro-current amplifier capable of automatic calibration and a calibration method thereof. Background technique [0002] A hydrogen flame ionization detector (FID) is a detector that uses a hydrogen flame as an ionization source to ionize organic matter and generates a microcurrent to respond, also known as a hydrogen flame ionization detector. It is one of many gas phase ionization detectors and is a destructive, typically mass-type detector. [0003] There is a high-voltage electric field between the collecting electrode and the polarizing electrode of the hydrogen flame ionization detector. After the combustible gas ejected from the flame nozzle is ignited, a high temperature will be generated in a certain range. Under the action of ionization, under the action of a high-voltage electric field, positive ions flow to the collector side, while electrons and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/64G01N30/86
CPCG01N30/02G01N30/64G01N30/8665
Inventor 明菊兰余璐静潘芝瑛钱洲亥许飞于志勇胡家元王立华邬凯张黎晖赵鑫闫鹏刘馨
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY