CN202512106U

CN202512106U - Singlechip-based multi-gas detection system

Info

Publication number: CN202512106U
Application number: CN2012201180614U
Authority: CN
Inventors: 钱国东
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-26
Filing date: 2012-03-26
Publication date: 2012-10-31
Anticipated expiration: 2022-03-26

Abstract

The utility model discloses a singlechip-based multi-gas detection system, which comprises a gas sensor array module, an analog/digital (A/D) converter, a singlechip, a light emitting diode (LED) display module and an alarm module, wherein the gas sensor array module is connected to an input end of a singlechip through the A/D converter; an output end of the singlechip is respectively connected with the input ends of the LED display module and the alarm module; the gas sensor array module converts gas information which is acquired into an electric signal; the electric signal is converted into a digital signal through the A/D converter; the singlechip performs data acquisition processing on the digital signal; and data information which is obtained by processing is displayed by the LED display module and the alarm module. The singlechip-based multi-gas detection system has the advantages that a sensor array is formed by a plurality of sensors, various kinds of gas can be subjected to information acquisition, information conversion and data processing, and the type information and concentration information of the gas are displayed, so various kinds of gas can be conveniently, stably and accurately detected.

Description

A kind of SCM Based many gas detecting systems

Technical field

The utility model relates to a kind of singlechip technology, relates in particular to a kind of SCM Based many gas detecting systems.

Background technology

Gas sensor is a kind of device that can become electric signal with gaseous species and with concentration dependent information translation.Power according to these electric signals just can obtain in environment, to have the relevant information of situation with gas to be measured, thereby can detect, monitor, report to the police.Therefore the intelligent smell identification instrument that is made up of gas sensor and the PRS field that has a wide range of applications like food industry, chemical industry, environmental monitoring, medical diagnosis, safety inspection etc., more and more receives extensive concern.

Traditional gas detection adopts single gas detection mode mostly, and a kind of gas of promptly every measurement needs a kind of measurement instrument.The detection and Identification that can carry out multiple gases with a kind of instrument are development trends of gas detecting instrument.

The utility model content

The above-mentioned technical matters that the utility model will solve provides a kind of SCM Based many gas detecting systems; Comprise gas sensor array module, A/D converter, single-chip microcomputer, LED display module and alarm module; Said gas sensor array module is connected to the input end of single-chip microcomputer through A/D converter, and the output terminal of said single-chip microcomputer is connected respectively to the input end of said LED display module and alarm module; Said gas sensor array module becomes electric signal with the gas information translation of gathering; Said electric signal converts digital signal into through A/D converter; Single-chip microcomputer carries out data acquisition process to digital signal, and the data message that obtains after the processing shows through LED display module and alarm module.

The beneficial effect of the utility model: native system adopts multiple gases sensors such as alcohol sensor, methane transducer, carbon monoxide transducer to form sensor array; Can detect the special component in the gas through sensor array; And be translated into electric signal; Adopting ADC0809 then is digital signal with the analog signal conversion of sensor output; Utilization AT89C51 carries out data processing and calculating, and shows gaseous species and concentration information through LED, has so just realized qualitative identification and detection to multiple gases.

Description of drawings

Fig. 1 is the system architecture synoptic diagram;

Fig. 2 is the line circuit of ADC0809 and 89C51;

Embodiment

Describe below in conjunction with the technical scheme implementation method of accompanying drawing: among Fig. 1 utility model; A kind of SCM Based many gas detecting systems; Partly be made up of data acquisition, data-switching, data processing, result's demonstration and warning etc., the chip that relates to has AD0809 modulus conversion chip, AT89C51 single-chip microcomputer, SUN7474 frequency generator and some gas sensors, driving circuit, reset circuit and LED display module.Said gas sensor array module is connected to the input end of single-chip microcomputer through A/D converter, and the output terminal of said single-chip microcomputer is connected respectively to the input end of said LED display module and alarm module; Said gas sensor array module becomes electric signal with the gas information translation of gathering; Said electric signal converts digital signal into through A/D converter; Single-chip microcomputer carries out data acquisition process to digital signal, and the data message that obtains after the processing shows through LED display module and alarm module.

Gas sensor array is the crucial component units of electronics olfactory system, is equivalent to elementary olfactory nerve unit, by have broad spectrum response characteristic, cross sensitivity big, different odor/gas is made up of the gas sensor of different sensitivity.

Gas sensor is a core devices of forming gas sensor array.Gas sensor is a kind ofly to detect the special component in the gas, and is translated into the device of electric signal.Usually, gas sensor array can adopt several independent gas sensors to combine, and adopts integrated technique to make, and volume is little, and is low in energy consumption, is convenient to the concentrated collection and the processing of signal.Single gas sensor and biography sensitive array have the difference of matter on characteristic; Single gas sensor is represented the response usable intensity of smell/gas; And gas sensor array forms response modes in the hyperspace that all sensors is formed except each sensor's response, under the certain situation of environmental baseline; Response modes on the array and its excitation are one to one, and this this system key point that can carry out identification to multiple smell and gas just.

Native system requires to realize the qualitative and quantitative analysis to alcohol, methane, CO gas, and at first most important work is to select right sensors, through the contrast to performance, realizability, price etc.; To alcohol gas, selection be the MQ-303A alcohol sensor, to methane gas; What adopt is the MQ-4 semiconductor gas sensor; To CO gas, selection be the V-40 carbon monoxide transducer, form sensor array by these three kinds of sensors.

Gas information is gathered through gas sensor array by this system, and the information that collects is converted into electric signal, delivers to ADC0809 then and carries out analog to digital conversion.

By the ultra-weak electronic signal of gas sensor array output, warp signal amplification circuit separately carries out pre-service to signal, makes it convert the direct current signal that changes in O～5V scope into, delivers to the A/D change-over circuit and is transformed to digital signal, and it is carried out data acquisition process.

Among Fig. 2, be ADC0809 and single-chip microcomputer 89C51 line wiring diagram, with being connected of 89C51 single-chip microcomputer, native system selects for use the ADC0809 chip that the gas information that collects is carried out analog to digital conversion for ease.Its resolution is 8, needn't carry out the adjustment of zero point and full scale, and has high impedance chopped wave stabilizing comparer, but in 8 single-ended simulating signals of the multi-way switch direct access of 8 passages one.Utilize single-chip microcomputer to write the startup A/D converter, send interrupt request singal by ADC0809 to 89C51 again behind the EOC, CPU responds interrupt request.Through read operation, read transformation result and deliver to measured respective storage areas code translator.Reselect measuredly again, and start A/D conversion back once more and interrupt returning.

Claims

1. SCM Based many gas detecting systems; It is characterized in that; Comprise gas sensor array module, A/D converter, single-chip microcomputer, LED display module and alarm module; Said gas sensor array module is connected to the input end of single-chip microcomputer through A/D converter, and the output terminal of said single-chip microcomputer is connected respectively to said LED and shows the input end of touching piece and alarm module; Said gas sensor array module becomes electric signal with the gas information translation of gathering; Said electric signal converts digital signal into through A/D converter; Single-chip microcomputer carries out data acquisition process to digital signal, and the data message that obtains after the processing shows through LED display module and alarm module.