CN208314014U - A kind of mining wind measuring device based on MEMS wind detection sensor - Google Patents

Abstract

A kind of mining wind measuring device based on MEMS wind detection sensor, it is mainly used in safety of coal mines, it includes MEMS vector wind detection sensor, signal extracting circuit, dsp processor, display, it is characterized by: the output connection signal of MEMS vector wind detection sensor extracts the input of circuit, the input of the output connection dsp processor of signal extracting circuit, the output of dsp processor connect display；The signal extracting circuit is sequentially connected and is formed by power supply pressure supply and compensation circuit, adjustable stabilized voltage supply, bridge circuit, two-stage differential amplifying circuit, low-pass filter, follower.The utility model is small in size, can be mass, Real-time Remote Sensing monitoring, and since what is utilized is static(al) measurement, no electrostatic phenomenon is securely and reliably easy in mine fixed, has broad application prospects and market in field of coal mining.

Description

A kind of mining wind measuring device based on MEMS wind detection sensor

Technical field

The present invention relates to mining wind measuring device, specifically a kind of mining wind measuring device based on MEMS wind detection sensor.

Background technique

Coal enterprise is high risk industries, and safety in production is the most important thing of coal production, the wherein effect of wind detection sensor Be it is very important, for guarantee each operating location in underground have enough suitable air quantity, it is ensured that safety in production, it is necessary to by survey wind Device accurately measures.

Traditional mining wind measuring device is made of the impeller and data processing display of mechanical structure, based on mechanical rotation Formula principle, i.e. impeller rotate under the action of distinguished and admirable, and revolving speed is directly proportional to wind speed, utilize some attachmentes installed on impeller, root The revolving speed of impeller is transformed into electricity according to principles such as photoelectricity, inductance, using electronic circuit realize wind speed automatically record and number Display.When measuring, wind direction amount, that is, wind speed and direction measures respectively, all asynchronous over time and space, measurement As a result there is biggish error between actual wind vector, especially in the threshold wind velocity difference of wind direction and air velocity transducer, It may cause full of prunes measurement result, in addition, it is used that it has rotation due to the design feature of rotary wind detection sensor Property, it is difficult to measure the transient change value of wind.Feature is convenient reading, it is easy to accomplish telemetering.Although such anemometer technology is very Maturation, but such sensor structure is complicated, is not easy to be monitored in real time, volume is relatively large, is not easy to be fixedly mounted, and impeller Rotation can generate electrostatic, the danger of explosion can be generated in the Minepit environment full of gas, and cannot determine the wind direction, some The more severe occasion operation and maintenance of application environment is all inconvenient.Therefore develop a kind of structure is simple, it is fixed, small in size to be easy to, Be easy in mine it is fixed can the wind measuring device of Real-time Remote Sensing monitoring be of great significance.

It is a kind of new principle that MEMS technology, which is applied in mine, new technology, and new method had both overcome tradition machinery formula, heat The shortcomings that effect formula, electronics vane type measuring device, simultaneously because MEMS technology and semiconductor planar process compatible, because This can make sensitive detection part and signal processing circuit portion point simultaneously on silicon wafer, realize single-chip integration or even system collection At, and can develop as microsensor of new generation.Utilize the survey wind arrow quantity sensor of MEMS technology combination piezoresistive principles development It comes into being, compared with existing frequently-used rotating detector, time constant is small, has good dynamic characteristic, can be simultaneously The all information for measuring wind vector, the wind speed completely eliminated when carrying out dynamic measurement using rotary wind detection sensor are excessively efficient It should problem asynchronous with wind direction and wind velocity time and space.

Summary of the invention

In order to solve existing mining wind measuring device, structure is complicated, bulky, is not easy to be fixedly mounted, cannot determine the wind direction, The all inconvenient problem of operation and maintenance, the utility model provide a kind of novel mining measuring wind based on MEMS wind detection sensor Device.

The utility model adopts the following technical scheme that realization:

A kind of mining wind measuring device based on MEMS wind detection sensor, including MEMS vector wind detection sensor, signal extraction Circuit, dsp processor, display, the output connection signal of MEMS vector wind detection sensor extract the input of circuit, and signal mentions The input of the output connection dsp processor of sense circuit, the output of dsp processor connect display；The signal extracting circuit by Power supply pressure supply and compensation circuit, adjustable stabilized voltage supply, bridge circuit, two-stage differential amplifying circuit, low-pass filter, follower according to Secondary connection composition.

The A/D converter of the dsp processor is connected with signal processing circuit.

The GPIO mouth of the dsp processor is connected with display.

The wind number of the MEMS vector wind detection sensor acquisition wind field, after signal extracting circuit is handled, by DSP After the analog signal that the A/D converter of reason device exports MEMS vector wind detection sensor is acquired, converts, it is sent to algorithm point Analysis, calculates wind speed and direction, is finally shown by the GPIO mouth driving display of dsp processor.

The wind field signal acquisition of the utility model needs may be constructed different array formats, Mei Gemo according to different Block possesses independent address and processing unit, is uniformly controlled by computer, realizes synchronous acquisition.

When utility model works, the address of wind signal acquisition module is set first, module is then placed on defined position It sets, computer is waited to issue acquisition.After the completion of signal acquisition, acquired data storage is deposited in the data of each acquisition module In reservoir.Since A/D converter can only receive the signal of 0-3V, after data have acquired, first have to lead to the signal of acquisition It crosses signal conditioning circuit and collected voltage signal is converted into 0 ~ 3V.Then A/D conversion will be transmitted to by the signal of conditioning Device.Analog-to-digital conversion and data storage processing, the pin company of LCD and the output of dsp chip data are carried out under control of the microprocessor It connects, LCD is transferred to by serial ports and carries out real-time display.Wherein, microprocessor is the core of signal acquisition module, and other parts are all It is completion work under its control.

Micro process uses the TMS320F2812 micro process of TI company, improves the speed and precision of data processing.

The MEMS vector wind detection sensor of the utility model, high sensitivity, vector property, single-sensor can be realized wind speed and Wind direction detection.

Power supply pressure supply and compensation circuit is used to provide stable 3.6V voltage for regulated power supply chip, and to based on pressure drag The sensitivity temperature drift of the four beams-cilium formula sensitive structure of effect compensates, and high-precision regulated power supply is to electric bridge pressure supply；Due to Sensor weak output signals, at the same for reduce sensor output signal line loss and noise jamming, to circuit signal into Gone low-pass filtering and two-stage differential amplification.

The MEMS wind detection sensor refers to that China Patent No. is that " micro-nano wind measuring vector passes disclosed in 201110433663.9 Sensor ".

The utility model be with TMS320F2812 in mining wind measuring system application for background, receive mine under wind field Signal carries out analog-to-digital conversion and is transferred to LCD by serial ports to carry out real-time display by DSP.Wind field wind number connects through sensor After receipts, analog signal is collected by the input pin of A/D converter inside dsp chip, by DSP processing system, will be acquired The data come are pre-processed in dsp, software section are then passed data to again, so not only without the negative of increase system Load, and system can be allowed to handle other things with more times.

The utility model realizes the detection of wind speed and direction using MEMS wind detection sensor, has compact, and cost performance is high, It can be mass, Real-time Remote Sensing monitoring, since what is utilized is static(al) measurement, no electrostatic phenomenon is securely and reliably easy in mine It is fixed, it is had broad application prospects and market in field of coal mining.

Detailed description of the invention

Fig. 1 is the structural block diagram of the utility model；

Fig. 2 is signal extracting circuit block diagram in the utility model；

Fig. 3 is power supply pressure supply and compensation circuit schematic diagram in the utility model；

Fig. 4 is differential amplifier circuit schematic diagram in the utility model；

Fig. 5 is the utility model low-pass filter circuit schematic diagram.

Fig. 6 is the program flow diagram of the utility model.

Specific embodiment

Shown in Fig. 1, a kind of mining wind measuring device based on MEMS wind detection sensor, including MEMS vector wind detection sensor, Signal extracting circuit, dsp processor, display, the output connection signal of MEMS vector wind detection sensor extract the input of circuit, The input of the output connection dsp processor of signal extracting circuit, the output of dsp processor connect display；The signal extraction Electric routing power pressure supply and compensation circuit, adjustable stabilized voltage supply, bridge circuit, two-stage differential amplifying circuit, low-pass filter, with Composition is sequentially connected with device.

A/D converter is connected with signal processing circuit inside dsp processor, and GPIO mouthfuls of dsp processor are connected with display； Wind number in the wind detection sensor acquisition wind field, after signal extracting circuit is handled, by the inside A/D of dsp processor After the analog signal that converter exports sensor is acquired, converts, it is sent to algorithm analysis, calculates wind speed and direction, most It is shown afterwards by the GPIO mouth driving display of dsp processor.

The MEMS wind detection sensor refers to that China Patent No. is " micro-nano wind measuring vector disclosed in 201110433663.9 Sensor ".

Shown in Fig. 2, the signal extracting circuit include power supply pressure supply and compensation circuit, adjustable stabilized voltage supply, bridge circuit, Two-stage differential amplification, low-pass filtering and follower are connected in sequence.

Power supply pressure supply and compensation circuit is used to provide stable 3.6V voltage for regulated power supply chip, and to based on pressure drag The sensitivity temperature drift of the four beams-cilium formula sensitive structure of effect compensates, and high-precision regulated power supply is to electric bridge pressure supply；Due to Sensor weak output signals, at the same for reduce sensor output signal line loss and noise jamming, to circuit signal into Gone low-pass filtering and two-stage differential amplification.

Shown in Fig. 3, the power supply pressure supply and compensation circuit are put by diode D1 and resistance R1, R2, R3, RSET, operation Big device LM353 and its peripheral circuit are constituted, the constant current that supply sensor does not vary with temperature.

Using constant current source power supply, the output of electric bridge and the variable quantity of resistance are directly proportional, also directly proportional to source current, i.e., electric The supply current size of bridge output and constant-current source is related with precision, is not affected by temperature, and is conducive to reduce sensitivity temperature drift.

Operational amplifier LF353, resistance RSTC and transistor Q1 constitute temperature-compensation circuit, and RSTC is for being arranged electricity Pressure gradient is used to compensate since temperature generates sensitivity error, since the output voltage sensitivity drift of electric bridge has negative temperature system Number, then offset it with transistor base-transmitting voltage across poles Vbe negative temperature characteristic.Meanwhile in the negative anti-of LF353 Connect RSTC in feed resistance, just makes up bridge section sensitivity negative temperature characteristic with the positive temperature characterisitic of gain to reach Purpose.As temperature increases, RSTC resistance value increases, and operational amplifier LF353 amplification factor reduces, and will make electric bridge pressure supply The voltage value of VCC3.6V reduces, and the voltage of VCC3.6V is at this moment just compensated for using the negative temperature coefficient of pn-junction in transistor Q1 Value reduces, and thus plays the compensating action of sensitivity temperature.

Adjustable stabilized voltage supply uses the low pressure difference linearity regulated power supply MAX8526 of Maxim company, and input voltage range exists Between 1.425V~3.6V, output voltage range is between 0.5V~3.4V.

Shown in Fig. 4, differential amplifier circuit selects instrument amplifier AD620 chip, only needs an external resistance RG that can set Determine gain, gain ranging 1~1000.

Low-pass filter uses eight rank Butterworth capacitance switch type low-pass filter MAX291, and corner frequency is from 0.1Hz To 25KHz, clock can be generated using the oscillator of chip interior by connecing a capacitor in CLK pin.

The low pass filter cutoff frequencyf ₀The concatenated capacitance selection 101 in the end=3KHz, CLK.

The follower uses emitter follower, solves the problems, such as high load.

Requirement and sensor output signal in view of algorithm to dominant frequency are converted in real time to A/D converter fast conversion times Requirement, the dsp processor use TI company TMS320F2812 chip.

A/D converter (A/D converter) uses TMS320F2812 chip in the utility model.

The three-way output signal of MEMS wind detection sensor connects A/D converter CINA0, CINA1, CINA2 tri- inputs respectively Pin.

16 analog input channels of A/D converter, cascade are formed 16 channel modules, automatic sequence by the utility model Column device is a 16 single channel automatic sequence generators.It, automatically will knot after the collected converted device conversion of analog signal Fruit is stored in corresponding result register, and sequencer uses starting/stop mode, using software triggering mode, by CPU The interruption of timer is started to work to start A/D converter, and sample rate is also controlled by CPU timer.

The display uses 1602LCD liquid crystal device, and the digital I/O port of DSP indirectly controls 1602, realizes the timing of the two Matching.By GPIOB2-GPIOB4 complete reading and writing, the configuration of enable end timing, and GPIO5-GPIO13 with 1602 data terminal phase Even, the data transmission of the two is realized.

The utility model program circuit includes the initialization section of DSP program, acquisition process part and part as the result is shown.

Shown in Fig. 6, the peripheral hardware of all applications of DSP and clock are needed to be placed in initial shape by program initialization according to system State, including interrupt identification is reset, AD, GPIO mouthfuls of initialization, timer clearing；Then waiting timer interrupt instruction is adopted Collection starts A/D conversion, while determining whether sampling is completed if receiving acquisition instructions, continues to sample if sampling does not complete, If sample conversion is completed, DSP carries out data storage and processing, the data of conversion is sent into result register, and call wind Fast wind direction algorithm routine carries out specific algorithm analysis to data by DSP and handles, and the programming of display portion exists the result of processing It is shown on LCD.

Claims (4)

1. a kind of mining wind measuring device based on MEMS wind detection sensor, including MEMS vector wind detection sensor, signal extraction electricity Road, dsp processor, display, it is characterised in that: the output connection signal of MEMS vector wind detection sensor extracts the defeated of circuit Enter, the input of the output connection dsp processor of signal extracting circuit, the output of dsp processor connects display；The signal mentions Sense circuit by power supply pressure supply and compensation circuit, adjustable stabilized voltage supply, bridge circuit, two-stage differential amplifying circuit, low-pass filter, Follower is sequentially connected composition.

2. a kind of mining wind measuring device based on MEMS wind detection sensor according to claim 1, it is characterised in that: described The A/D converter of dsp processor is connected with signal processing circuit.

3. a kind of mining wind measuring device based on MEMS wind detection sensor according to claim 1, it is characterised in that: described The GPIO mouth of dsp processor is connected with display.

4. a kind of mining wind measuring device based on MEMS wind detection sensor according to claim 1, it is characterised in that: described MEMS vector wind detection sensor acquires the wind number of wind field, after signal extracting circuit is handled, by the inside A/ of dsp processor After the analog signal that D converter exports sensor is acquired, converts, it is sent to algorithm analysis, calculates wind speed and direction, most It is shown afterwards by the GPIO mouth driving display of dsp processor.