CN203350208U

CN203350208U - Combustible mixed gas intelligent analysis system based on catalytic sensor

Info

Publication number: CN203350208U
Application number: CN 201320144910
Authority: CN
Inventors: 张愉; 陆生华; 童敏明
Original assignee: Suzhou Vocational University
Current assignee: Suzhou Vocational University
Priority date: 2013-03-27
Filing date: 2013-03-27
Publication date: 2013-12-18
Anticipated expiration: 2023-03-27

Abstract

The utility model discloses a combustible mixed gas intelligent analysis system based on a catalytic sensor. The combustible mixed gas intelligent analysis system based on the catalytic sensor comprises a multi-point constant-temperature detection circuit, peripheral devices and a control panel, wherein the multi-point constant-temperature detection circuit is connected to an AC1 port of the control panel; all the peripheral devices are connected to the control panel; and the control panel is an Atmege8 singlechip. With the adoption of the manner, the combustible mixed gas intelligent analysis system can well realize detection of various mixed combustible gases; and at the same time, the combustible mixed gas intelligent analysis system has the characteristics as follows: a peripheral circuit is simple, the wiring is easy, the cost is low, the use is convenient, the anti-interference capability is high, and the like.

Description

Burning mixture intelligent analysis system based on catalytic sensor

Technical field

The utility model relates to the gas analysis field, particularly relates to a kind of burning mixture intelligent analysis system based on catalytic sensor.

Background technology

Gas analysis has a very important role at aspects such as commercial production, environmental protection, safety monitoring, scientific researches.At present the detection of burning mixture is analyzed and usually adopted the multiple gases sensor directly to measure, but often there is a kind of cross sensitivity phenomenon in many gas sensors, have affected the effect of gas analysis.In recent years, employing Gas Sensor Array and Processing with Neural Network cell formation gas analysis system have also appearred, but this mode depends on the selectivity of gas sensor to special gas, and many gas sensors are subject to the impact of environmental gas larger, are difficult to obtain the testing result that reliability is higher.Given this plant situation, in order to solve problems of the prior art, our specialized designs a kind of burning mixture intelligent analysis system based on catalytic sensor.Thermal catalytic sensor in this system is that a kind of detection comprises mine gas and the most frequently used gas sensor of other inflammable gas, and it has unique selectivity to inflammable gas.According to the operating characteristic of Thermal catalytic sensor, control its different working temperature, different inflammable gass is showed to different sensitivity, this is to utilize single-sensor determination and analysis burning mixture to create favourable condition.This system peripherals circuit is simple, wiring is easy, and cost is low, easy to use, can realize preferably the detection of multiple mixed combustible gas body, and popularizing application prospect is preferably arranged.

The utility model content

The technical matters that the utility model mainly solves is to provide a kind of burning mixture intelligent analysis system based on catalytic sensor, can realize preferably the detection of multiple mixed combustible gas body, have that peripheral circuit is simple simultaneously, wiring easily, the characteristics such as cost is low, and easy to use and antijamming capability is strong.

For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of burning mixture intelligent analysis system based on catalytic sensor is provided, should comprise multiple spot Constant Temperature Detection circuit, peripheral unit and control mainboard by the burning mixture intelligent analysis system based on catalytic sensor, described multiple spot Constant Temperature Detection circuit is connected to the AC1 port of controlling mainboard, described peripheral unit all is connected to the control mainboard, and described control mainboard is the Atmege8 single-chip microcomputer.

Preferably, described multiple spot Constant Temperature Detection circuit comprises by resistance R ₁, R ₂, R ₃with the electric bridge that catalysis sensing element r forms, electric bridge and regulator A form the constant temperature closed control circuit, and the constant temperature closed control circuit also is provided with a program control potentiometer B.

Preferably, described peripheral unit comprises environment temperature sensor, key circuit, LED display module and EEPROM module, described LED display module and EEPROM module are directly connected to the Atmege8 single-chip microcomputer, described environment temperature sensor is connected to the ACO port of Atmege8 single-chip microcomputer, and described key circuit is connected to the PB4-PB6 port of Atmege8 single-chip microcomputer

The beneficial effects of the utility model are: the burning mixture intelligent analysis system of the utility model based on catalytic sensor, its peripheral circuit is simple, wiring is easy, and cost is low, easy to use, can realize preferably the detection of multiple mixed combustible gas body, popularizing application prospect is preferably arranged.

The accompanying drawing explanation

Fig. 1 is the structural representation of the burning mixture intelligent analysis system of the utility model based on catalytic sensor;

Fig. 2 is the multiple spot Constant Temperature Detection circuit diagram of the burning mixture intelligent analysis system of the utility model based on catalytic sensor.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that, protection domain of the present utility model is made to more explicit defining.

Refer to shown in Fig. 1 and Fig. 2, the utility model embodiment comprises:

A kind of burning mixture intelligent analysis system based on catalytic sensor, should comprise multiple spot Constant Temperature Detection circuit 1, peripheral unit 2 and control mainboard 3 by the burning mixture intelligent analysis system based on catalytic sensor, described multiple spot Constant Temperature Detection circuit 1 is connected to the AC1 port of controlling mainboard 3, described peripheral unit 2 all is connected to controls mainboard 3, and described control mainboard 3 is control core Atmege8 single-chip microcomputer;

Described peripheral unit 2 comprises environmental sensor 21, key circuit 22, LED display module 23 and EEPROM module 24, described LED display module 23 and EEPROM module 24 are directly connected to the Atmege8 single-chip microcomputer, described environmental sensor 21 is connected to the ACO port of Atmege8 single-chip microcomputer, and described key circuit 22 is connected to the PB4-PB6 port of Atmege8 single-chip microcomputer;

As shown in Figure 1, the Atmege8 single-chip microcomputer be aly have that travelling speed is fast, 8 8-digit microcontrollers of low-power consumption, employing CMOS technology, and it just can carry out an instruction within a clock period, so Atmege8 can reach the performance that approaches 1MIPS/MHz.Wherein, utilize PB7, the PC2 mouth regulator potentiometer of Atmege8 single-chip microcomputer in native system, all produce three specific current value I while making each detection ₁, I ₂, I ₃thereby, make r1, r2, r3 is unique to be determined, at this moment just can be in advance r1, r2, the value of r3 is stored in the ROM of single-chip microcomputer, as known quantity, uses, and this just can be avoided single-chip microcomputer to do some complex calculations.

In environment temperature one regularly, C _ifor constant, thus utilize the AC0 mouth of Atmege8 single-chip microcomputer to detect environment temperature, thus draw C _i.At r1, r2, r3, C _iall in fixed situation, because the connection weight W between neuron has determined parameter μ ₁₁, μ ₁₂.... μ _nn, μ here _nnfor μ ₃₃.To the floating-point operation ability, at this, adopt look-up table due to single-chip microcomputer, according to AD translation data table look-at, obtain P _i=f _i(U ₁, U ₂... .U _n; r ₁, r ₂... .r _n; C ₁, C ₂... .C _n; μ ₁₁, μ ₁₂... .. μ _nn) and then give LED to show digital quantity, during demonstration, can adopt button to control, what show such as button one is methane concentration, and what button two showed is the concentration of butane, and what button three showed is the concentration of acetylene.

As shown in Figure 2, multiple spot Constant Temperature Detection circuit working principle: at first adjust arm resistance, the electric current I on the catalysis sensing element r that makes to flow through equals its rated operational current I ₀, now electric bridge is in equilibrium state, output signal U=I ₀r.When detecting inflammable gas, catalytic oxidation occurs on catalysis sensing element surface in tested gas, produces a large amount of heats, and the temperature of catalysis sensing element is raise, and resistance increases.By the control of regulator A, automatically reduce electric current I, the temperature of catalysis sensing element r is descended, resistance returns to initial value, and electric bridge restores balance again.Now, output voltage U ₀=Ir ₀can reduce.Thereby reflect the concentration of tested gas.So, in Constant Temperature Detection, the temperature of catalysis sensing element remains constant.In Fig. 2, B is a program control potentiometer, and by the adjustment of potentiometer, the working current of adjustable sensor, be operated at different temperature catalytic sensor, forms multiple spot Constant Temperature Detection circuit.

A kind of burning mixture intelligent analysis system based on catalytic sensor of the utility model, it is peripheral simply, wiring is easy, and cost is low, easy to use, can realize preferably that multiple mixed combustible gas detects, and has popularizing application prospect preferably.

The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model instructions and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present utility model.

Claims

1. the burning mixture intelligent analysis system based on catalytic sensor, it is characterized in that: should comprise multiple spot Constant Temperature Detection circuit, peripheral unit and control mainboard by the burning mixture intelligent analysis system based on catalytic sensor, described multiple spot Constant Temperature Detection circuit is connected to the AC1 port of controlling mainboard, described peripheral unit all is connected to the control mainboard, and described control mainboard is the Atmege8 single-chip microcomputer.

2. a kind of burning mixture intelligent analysis system based on catalytic sensor according to claim 1, it is characterized in that: described multiple spot Constant Temperature Detection circuit comprises by resistance R ₁, R ₂, R ₃with the electric bridge that catalysis sensing element r forms, electric bridge and regulator A form the constant temperature closed control circuit, and the constant temperature closed control circuit also is provided with a program control potentiometer B.

3. a kind of burning mixture intelligent analysis system based on catalytic sensor according to claim 1, it is characterized in that: described peripheral unit comprises environment temperature sensor, key circuit, LED display module and EEPROM module, described LED display module and EEPROM module are directly connected to the Atmege8 single-chip microcomputer, described environment temperature sensor is connected to the ACO port of Atmege8 single-chip microcomputer, and described key circuit is connected to the PB4-PB6 port of Atmege8 single-chip microcomputer.