A flexible circuit of a resistive gas sensor and a gas concentration calculation method

A gas sensor and flexible circuit technology, applied in the direction of material resistance, can solve the problems of inability to extract the response signal of the sensor in time, decrease the measurement accuracy, etc., and achieve the effects of compensating for influence, improving accuracy and high input impedance.

Active Publication Date: 2021-09-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the response resistance value of the gas sensor reaches the megohm level and above and the environment of the gas sensor is high temperature and high humidity or low temperature and low humidity and other very temperature and humidity conditions, the measurement accuracy of this method will drop sharply; when it is applied to a large gas sensor array Under the condition of monitoring the complex composition of the ambient gas, the traversal reading is unable to realize the timely extraction of the sensor response signal

Method used

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  • A flexible circuit of a resistive gas sensor and a gas concentration calculation method
  • A flexible circuit of a resistive gas sensor and a gas concentration calculation method
  • A flexible circuit of a resistive gas sensor and a gas concentration calculation method

Examples

Experimental program
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Effect test

Embodiment 1

[0062] In this example, taking a single resistive ammonia sensor as an example, that is, M=N=1, the schematic diagram of the structure and composition of the gas sensor module U2 is as follows figure 2 shown. It is assumed that the response resistance Rx of the ammonia sensor increases with the increase of the ambient ammonia concentration. The signal gating circuit 1312 adopts a single-channel analog switch chip, COUNT=0, the channel control pin A0 is connected to the pin IO5 of the DSP chip U5, and the pin S1 is connected to one end of the resistive ammonia sensor U (1, 1); the voltage The output terminal of the comparator A1-U(1,1,1) is connected to the input terminal of the first OR gate, and the output terminal of the voltage comparator A2-U(1,1,2) is connected to the input terminal of the second OR gate The terminals are connected, and the other input terminal of the two OR gates is low level.

[0063] Step 1. Predict whether the resistance type ammonia sensor U(1, 1)...

Embodiment 2

[0085] In this example, with Taking the resistive gas sensor array as an example, the structure of the gas sensor module U2 is shown in the schematic diagram image 3 As shown, M=N=2, COUNT=1. Signal gating circuit 1312 adopts four-channel analog switch chip U6, channel control pin A0 and channel control pin A1 are respectively connected to pins IO5 and IO6 of DSP chip U5, pin S1, pin S2, pin S3 and pin S4 is connected to one end of the resistance type gas sensors U(1,1), U(1,2), U(2,1) and U(2,2) respectively.

[0086] Step 1. Predict whether the resistance gas sensor U(m,n) responds:

[0087] The pins IO0 and IO4 of the DSP chip U5 give high level and low level respectively, the channel of the single-channel analog switch chip SW1 is closed, all channels of the four-channel analog switch chip U6 are disconnected; the channel of the single-channel analog switch chip SW1 is closed Finally, the bias voltage V2 makes the two sets of switches S1-D1 and S2-D2 of the dual-chann...

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Abstract

The invention discloses a resistance type gas sensor flexible circuit and a gas concentration calculation method, belonging to the technical field of gas sensor applications. The circuit of the present invention includes a temperature and humidity information collection module, a DSP signal processing circuit and a sensor signal conditioning circuit. The circuit of the present invention expands the resistance measurement range of the circuit by introducing a reference resistance switching circuit and the same-phase proportional amplification circuit; by using the voltage corresponding to the response resistance as the reference voltage of the analog-to-digital conversion chip, it solves the problem that the sensor response resistance is 100 megaohms. The technical problem of inaccurate measurement; through the introduction of the temperature and humidity information acquisition module combined with the DSP signal processing circuit, combined with the gas concentration calculation method of the present invention, the influence of the ambient temperature and humidity on the gas sensor is compensated to obtain an accurate gas concentration value quickly and stably ; Applied to the gas sensor array, by preprocessing the response signal of the gas sensor, the extraction and analysis of the response signal can be completed in time.

Description

technical field [0001] The invention belongs to the technical field of gas sensor applications, and in particular relates to a flexible circuit of a resistance type gas sensor and a gas concentration calculation method. Background technique [0002] With the increasingly prominent environmental problems, the monitoring of the composition and concentration of ambient gases is an indispensable indicator in environmental assessment, so various gas sensors emerge in endlessly. Due to the characteristics of the sensitive materials used in some gas sensors, the response resistance of the sensor is often in the megohm level, or even up to hundreds of megohms. Existing resistance measurement methods such as partial pressure method and ordinary multimeter cannot accurately measure the response value, let alone measure the accurate gas concentration under the condition that the sensor is affected by temperature and humidity. [0003] The existing resistance measurement methods are mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
CPCG01N27/04
Inventor 太惠玲张明祥刘灿蒋亚东袁震谢光忠
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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