CN212483332U - Temperature compensation device - Google Patents
Temperature compensation device Download PDFInfo
- Publication number
- CN212483332U CN212483332U CN202020126861.5U CN202020126861U CN212483332U CN 212483332 U CN212483332 U CN 212483332U CN 202020126861 U CN202020126861 U CN 202020126861U CN 212483332 U CN212483332 U CN 212483332U
- Authority
- CN
- China
- Prior art keywords
- temperature compensation
- pin
- thermosensitive element
- circuit
- gas sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The application relates to temperature compensation equipment which comprises a gas sensor, a thermosensitive element, a partial pressure device and a single chip microcomputer. One end of the thermosensitive element is used for connecting a power supply; one end of the voltage divider is grounded, and the other end of the voltage divider is connected with the other end of the thermosensitive element. A first pin of the single chip microcomputer is connected with the gas sensor, and a second pin of the single chip microcomputer is connected between the thermosensitive element and the voltage divider. The current temperature value and the current gas state parameter value can be obtained through the temperature compensation equipment. The temperature compensation equipment can be internally provided with a corresponding relation between the temperature value and the temperature compensation value, so that the temperature compensation value at each temperature is obtained, and the temperature compensation of the current gas state parameter value is further completed. Because the gas sensor is susceptible to the accuracy of the output signal of the temperature, the detection accuracy of the gas sensor is low, the data obtained by the gas sensor can be more accurate based on the temperature compensation equipment, and the accuracy of the gas sensor at different temperatures is improved.
Description
Technical Field
The application relates to the technical field of gas sensors, in particular to temperature compensation equipment.
Background
Gas sensors are converters that convert a certain gas volume fraction into a corresponding electrical signal, and as the technology of gas sensors is continuously mature, gas sensors are continuously used in various gas detection scenarios.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the existing gas sensor has the problem that the data precision is easily influenced by the temperature.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a temperature compensation device capable of improving data accuracy of a gas sensor in response to the above technical problems.
In order to achieve the above object, an embodiment of the present invention provides a temperature compensation device, including:
a gas sensor;
a thermosensitive element; one end of the thermosensitive element is used for connecting a power supply;
a voltage divider device; one end of the voltage divider is grounded, and the other end of the voltage divider is connected with the other end of the thermosensitive element;
and a single chip microcomputer; a first pin of the single chip microcomputer is connected with the gas sensor, and a second pin of the single chip microcomputer is connected between the thermosensitive element and the voltage divider.
In one embodiment, the first pin is a first ADC pin; the second pin is a second ADC pin.
In one embodiment, the device further comprises a filter circuit;
one end of the filter circuit is connected between the thermosensitive element and the voltage divider, and the other end of the filter circuit is connected with the second pin and grounded.
In one embodiment, the filter circuit comprises a resistor and a capacitor;
one end of the resistor is connected between the thermosensitive element and the voltage divider, and the other end of the resistor is respectively connected with one end of the capacitor and the second pin;
the other end of the capacitor is grounded.
In one embodiment, the system further comprises a preprocessing circuit;
the input end of the preprocessing circuit is connected with the gas sensor, and the output end of the preprocessing circuit is connected with the first pin.
In one embodiment, the preprocessing circuit comprises a preamplification circuit and an analog-to-digital conversion circuit;
the input end of the preamplification circuit is connected with the gas sensor, and the output end of the preamplification circuit is connected with the input end of the analog-to-digital conversion circuit; the output end of the analog-to-digital conversion circuit is connected with the first pin;
the circuit also comprises a filter circuit;
the preamplifier circuit is connected with the analog-to-digital conversion circuit through the filter circuit.
In one embodiment, the system further comprises a display device;
the display equipment is connected with the singlechip.
In one embodiment, the gas sensor is a non-dispersive infrared carbon dioxide sensor.
In one embodiment, the thermistor is an NTC thermistor.
In one embodiment, the voltage divider is a voltage divider resistor.
One of the above technical solutions has the following advantages and beneficial effects:
the application provides a temperature compensation equipment, including gas sensor, thermal element, partial pressure device and singlechip. One end of the thermosensitive element is used for connecting a power supply; one end of the voltage divider is grounded, and the other end of the voltage divider is connected with the other end of the thermosensitive element. A first pin of the single chip microcomputer is connected with the gas sensor, and a second pin of the single chip microcomputer is connected between the thermosensitive element and the voltage divider. The current temperature value and the current gas state parameter value can be obtained through the temperature compensation equipment. The temperature compensation equipment can be internally provided with a corresponding relation between the temperature value and the temperature compensation value, so that the temperature compensation value at each temperature is obtained, and the temperature compensation of the current gas state parameter value is further completed. Because the gas sensor is susceptible to the accuracy of the output signal of the temperature, the detection accuracy of the gas sensor is low, the data obtained by the gas sensor can be more accurate based on the temperature compensation equipment, and the accuracy of the gas sensor at different temperatures is improved.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.
FIG. 1 is a first schematic block diagram of a temperature compensation apparatus according to an embodiment;
FIG. 2 is a second schematic block diagram of a temperature compensation apparatus according to an embodiment;
FIG. 3 is a third schematic block diagram of a temperature compensation apparatus according to an embodiment;
FIG. 4 is a fourth schematic block diagram of a temperature compensation apparatus according to an embodiment;
FIG. 5 is a fifth schematic block diagram of a temperature compensation apparatus according to an embodiment;
FIG. 6 is a block diagram showing a sixth schematic configuration of the temperature compensation device in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "first end," "second end," "one end," "another end," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In one embodiment, as shown in fig. 1, there is provided a temperature compensation device comprising:
a gas sensor 10;
a thermosensitive element 30; one end of the thermosensitive element 30 is used for connecting a power supply;
a voltage dividing device 20; one end of the voltage divider 20 is grounded, and the other end is connected with the other end of the thermosensitive element 30;
and a single chip 40; a first pin of the singlechip 40 is connected with the gas sensor 10, and a second pin of the singlechip 40 is connected between the thermosensitive element 30 and the voltage divider 20.
Wherein, the gas sensor can be any sensor in the field which converts a certain gas volume fraction into a corresponding electric signal. The thermosensitive element may be any element in the art that generates a characteristic change according to a change in temperature, and specifically, the characteristic may be a resistance value. The voltage dividing device is used for dividing voltage of the thermosensitive element.
Specifically, the thermosensitive element and the voltage divider form a voltage dividing module of the power supply. Under different temperatures, after the temperature of the thermosensitive element changes along with the temperature, the resistance value of the thermosensitive element also changes differently, so that the voltage value of the second end of the thermosensitive element changes. The second end of the thermosensitive element refers to an end of the thermosensitive element connected to the voltage divider. In one embodiment, the thermistor is an NTC thermistor. In one embodiment, the voltage divider is a voltage divider resistor. The first end of the thermosensitive element is used for grounding, the second end of the thermosensitive element is connected with one end of the voltage divider, and the other end of the voltage divider is connected with a power supply. The connection mode forms a loop of the voltage division device and the thermosensitive element.
In one embodiment, the gas sensor is a non-dispersive infrared carbon dioxide sensor. The existing non-spectroscopic infrared carbon dioxide sensor is applied to detecting the following defects of gas: 1. the receiving end is easily influenced by temperature, and thermopile signals at different temperatures are different; 2. the amplification performance of the whole circuit containing the non-dispersive infrared carbon dioxide sensor is influenced by temperature, so that the problem of inaccurate data output is caused; 3. the luminous intensity of a light source containing the non-light-splitting infrared carbon dioxide sensor is not consistent under different temperatures. And the above problems can be effectively solved by the above temperature compensation device.
A first pin of the single chip microcomputer is connected with the gas sensor, and a second pin of the single chip microcomputer is connected between the thermosensitive element and the voltage divider. The single chip microcomputer respectively acquires the current gas concentration detected by the gas sensor and the voltage value between the thermosensitive element and the voltage divider through the first pin and the second pin. The voltage value between the thermosensitive element and the voltage dividing device is also the voltage value of the second end of the thermosensitive element. Furthermore, the single chip microcomputer obtains a current temperature value according to the voltage value of the second end of the thermosensitive element, and the method is a conventional method for obtaining the temperature value by the single chip microcomputer.
In one embodiment, the first pin is a first ADC pin; the second pin is a second ADC pin. The single chip microcomputer can respectively acquire the current gas concentration and the voltage value between the thermosensitive element and the voltage divider through an ADC pin. In one embodiment, the thermistor comprises an NTC thermistor. In one embodiment, the voltage divider device includes a voltage divider resistor.
It should be noted that the corresponding relationship between the temperature value and the temperature compensation value may be built in the single chip microcomputer, and when the current temperature value is obtained, the corresponding temperature compensation value may be output, so as to obtain the compensated gas concentration according to the temperature compensation value and the current gas concentration. It should be noted that the corresponding relationship may include a graph or a table, and is not specifically limited herein. Further, the compensation according to the corresponding relation can be processed by another single chip microcomputer, and the temperature compensation equipment in the application can obtain the current temperature and the current gas concentration.
The temperature compensation equipment comprises a gas sensor, a thermosensitive element, a partial pressure device and a singlechip. One end of the thermosensitive element is used for connecting a power supply; one end of the voltage divider is grounded, and the other end of the voltage divider is connected with the other end of the thermosensitive element. A first pin of the single chip microcomputer is connected with the gas sensor, and a second pin of the single chip microcomputer is connected between the thermosensitive element and the voltage divider. The current temperature value and the current gas state parameter value can be obtained through the temperature compensation equipment. The temperature compensation equipment can be internally provided with a corresponding relation between the temperature value and the temperature compensation value, so that the temperature compensation value at each temperature is obtained, and the temperature compensation of the current gas state parameter value is further completed. Because the gas sensor is susceptible to the accuracy of the output signal of the temperature, the detection accuracy of the gas sensor is low, the data obtained by the gas sensor can be more accurate based on the temperature compensation equipment, and the accuracy of the gas sensor at different temperatures is improved.
In one embodiment, as shown in fig. 2, there is provided a temperature compensation device including:
a gas sensor 10;
a thermosensitive element 30; one end of the thermosensitive element 30 is used for connecting a power supply;
a voltage dividing device 20; one end of the voltage divider 20 is grounded, and the other end is connected with the other end of the thermosensitive element 30;
and a single chip 40; a first pin of the singlechip 40 is connected with the gas sensor 10, and a second pin of the singlechip 40 is connected between the thermosensitive element 30 and the voltage divider 20.
Also included is a filter circuit 50;
one end of the filter circuit 50 is connected between the thermosensitive element 30 and the voltage divider 20, and the other end is connected to the second pin and grounded.
The filter circuit is any circuit with a filter function in the field.
Specifically, the filter circuit is used for filtering the electric signal of the second end of the thermosensitive element. The second end of the thermosensitive element refers to an end of the thermosensitive element connected to the voltage divider, and the second end of the thermosensitive element may also refer to an end of the voltage divider connected to the thermosensitive element.
In one particular example, the filter circuit includes a low pass filter circuit.
Signals except for specific frequencies are filtered through the filter circuit, interference of the signals is reduced, and accuracy of the current temperature value is improved.
In one embodiment, as shown in fig. 3, the filter circuit includes a resistor 501 and a capacitor 503;
one end of the resistor 501 is connected between the thermosensitive element 30 and the voltage divider 20, and the other end is connected with one end of the capacitor 503 and the second pin respectively;
the other terminal of the capacitor 503 is grounded.
Specifically, the capacitor is a short circuit for high-frequency current, namely, high-frequency current can pass through the capacitor; due to the fact that the capacitor blocks direct current and alternating current, for low-frequency signals, the capacitor is open-circuit, the low-frequency signals cannot pass through, namely the high-frequency signals are all short-circuited to the ground, and therefore low-pass filtering is achieved.
Further, the cut-off frequency in the low-pass filtering may be obtained from the resistance value of the resistor and the capacitance value of the capacitor. The formula for the cut-off frequency is: f is 1/(2 pi RC). If the resistance is 10K and the capacitance is 0.78uf, the cutoff frequency is 1/(2 pi RC) 20 Hz.
In one embodiment, as shown in fig. 4, there is provided a temperature compensation apparatus including:
a gas sensor 10;
a thermosensitive element 30; one end of the thermosensitive element 30 is used for connecting a power supply;
a voltage dividing device 20; one end of the voltage divider 20 is grounded, and the other end is connected with the other end of the thermosensitive element 30;
and a single chip 40; a first pin of the singlechip 40 is connected with the gas sensor 10, and a second pin of the singlechip 40 is connected between the thermosensitive element 30 and the voltage divider 20.
Also included is a filter circuit 50;
one end of the filter circuit 50 is connected between the thermosensitive element 30 and the voltage divider 20, and the other end is connected to the second pin and grounded.
Also included is a preprocessing circuit 60;
the input end of the preprocessing circuit 60 is connected with the gas sensor 10, and the output end is connected with the first pin.
The preprocessing circuit may be any circuit in the art that modulates analog signals to eliminate interference.
Through the preprocessing circuit, the interference in the electric signals transmitted by the gas sensor is eliminated, and the electric signals are amplified and processed, so that more accurate data information, namely more accurate current gas concentration, is obtained.
In one embodiment, as shown in fig. 5, the preprocessing circuit includes a pre-amplification circuit 601 and an analog-to-digital conversion circuit 603;
the input end of the preamplification circuit 601 is connected with the gas sensor, and the output end is connected with the input end of the analog-to-digital conversion circuit 603; the output end of the analog-to-digital conversion circuit 603 is connected with a first pin;
also included is a filter circuit 605;
the pre-amplifier circuit 601 is connected to the analog-to-digital conversion circuit 603 through the filter circuit 605.
In particular, the pre-amplification circuit is used for amplifying the electrical signal transmitted by the gas sensor, and may be any one of the pre-amplification circuits in the art. The analog-to-digital conversion circuit is used for converting an analog signal into a digital signal, and may be any analog-to-digital conversion circuit in the art. The filter circuit may be any one of those in the art.
The preprocessing circuit amplifies and filters the electric signals transmitted by the gas sensor, and converts the analog signals into digital signals through the analog-to-digital conversion circuit and then is recognized by the singlechip.
In one embodiment, as shown in FIG. 6, a display device 70 is also included;
the display device 70 is connected to the single chip microcomputer.
Specifically, the display device may include a liquid crystal display or an electronic ink display, and is configured to display the compensated gas concentration value output by the single chip microcomputer.
To further illustrate the above embodiments, a brief description of a specific example is provided below:
in the step of obtaining the preset corresponding relation, assuming that the first temperature is 25 ℃, the preset concentration is 1000ppm, and the measured concentration received by the single chip microcomputer is also 1000 ppm;
when the temperature rises to 50 ℃, the gas concentration is also 1000ppm, and the measured concentration received by the singlechip is 900 ppm;
then in the temperature interval of 25-50 c, the error in measurement is 100ppm, which can be calculated to determine a concentration deviation of 4(100/25) ppm for each degree of increase in the interval of (25 c, 50 c).
Assuming that the current temperature received by the singlechip is 26 ℃, the measured current gas concentration is 996ppm, after temperature compensation, the real gas concentration (namely the target gas state parameter value) of the current environment is 1000ppm, and the data is corrected and displayed.
In another example, during the production of the sensor, a temperature compensation test (i.e., obtaining a preset corresponding relationship) is performed in a sealed space, 2 reference temperatures are selected, such as 25 ℃ and 50 ℃, the sealed space carbon dioxide is maintained at a concentration value a at 25 ℃, the sensor output value is V1, the sealed space temperature is increased to 50 ℃ at the time of maintaining the concentration value a, the sensor output value is V2, and a curve of the temperature value and the temperature compensation value of the sensor (i.e., the preset corresponding relationship) is determined according to the values of V2 and V1.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A temperature compensation device, comprising:
a gas sensor;
a thermosensitive element; one end of the thermosensitive element is used for connecting a power supply;
a voltage divider device; one end of the voltage divider is grounded, and the other end of the voltage divider is connected with the other end of the thermosensitive element;
and a single chip microcomputer; and a first pin of the singlechip is connected with the gas sensor, and a second pin of the singlechip is connected between the thermosensitive element and the voltage divider.
2. The temperature compensation apparatus of claim 1, wherein the first pin is a first ADC pin; the second pin is a second ADC pin.
3. The temperature compensation apparatus of claim 1, further comprising a filter circuit;
one end of the filter circuit is connected between the thermosensitive element and the voltage divider, and the other end of the filter circuit is connected with the second pin and grounded.
4. The temperature compensation apparatus of claim 3, wherein the filter circuit comprises a resistor and a capacitor;
one end of the resistor is connected between the thermosensitive element and the voltage divider, and the other end of the resistor is respectively connected with one end of the capacitor and the second pin;
the other end of the capacitor is grounded.
5. The temperature compensation apparatus of claim 1, further comprising a pre-processing circuit;
the input end of the preprocessing circuit is connected with the gas sensor, and the output end of the preprocessing circuit is connected with the first pin.
6. The temperature compensation apparatus of claim 5, wherein the pre-processing circuit comprises a pre-amplification circuit and an analog-to-digital conversion circuit;
the input end of the preamplification circuit is connected with the gas sensor, and the output end of the preamplification circuit is connected with the input end of the analog-to-digital conversion circuit; the output end of the analog-to-digital conversion circuit is connected with the first pin;
the circuit also comprises a filter circuit;
the pre-amplification circuit is connected with the analog-to-digital conversion circuit through the filter circuit.
7. The temperature compensation device of claim 6, further comprising a display device;
the display equipment is connected with the single chip microcomputer.
8. The temperature compensation apparatus of any one of claims 1 to 7, wherein the gas sensor is a non-dispersive infrared carbon dioxide sensor.
9. The temperature compensation device of any one of claims 1 to 7, wherein the thermistor is an NTC thermistor.
10. The temperature compensation apparatus of any one of claims 1 to 7, wherein the voltage dividing device is a voltage dividing resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020126861.5U CN212483332U (en) | 2020-01-19 | 2020-01-19 | Temperature compensation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020126861.5U CN212483332U (en) | 2020-01-19 | 2020-01-19 | Temperature compensation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212483332U true CN212483332U (en) | 2021-02-05 |
Family
ID=74414674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020126861.5U Active CN212483332U (en) | 2020-01-19 | 2020-01-19 | Temperature compensation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212483332U (en) |
-
2020
- 2020-01-19 CN CN202020126861.5U patent/CN212483332U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20070295095A1 (en) | Apparatus for providing an output proportional to pressure divided by temperature (P/T) | |
| CN102680803B (en) | Real-time monitoring microwave dicke radiometer based on reference load temperature | |
| CN106525325B (en) | Pressure measurement conversion circuit with adjustable differential signal gain | |
| US5268852A (en) | Self diagnostic pH sensor | |
| CN113489466B (en) | Circuit for eliminating signal offset of charge amplifier | |
| CN212483332U (en) | Temperature compensation device | |
| CN204064466U (en) | A kind of automobile-used infrared temperature measurement apparatus | |
| CN112130003B (en) | Device and method for removing electromagnetic interference signals in same frequency band | |
| CN110702252A (en) | Platinum resistance temperature measuring instrument with quick self-checking function | |
| CN105092087A (en) | Photoelectric conversion module, temperature compensation method for photoelectric conversion module, and distributed light sensing system | |
| EP4009060A1 (en) | Rf power detector | |
| CN114305404A (en) | Radiant heat collecting and amplifying circuit and application thereof | |
| CN113138174A (en) | Temperature compensation device and method | |
| CN113820029A (en) | PT100 temperature acquisition circuit for acquisition terminal | |
| CN111257273A (en) | Coal quality analyzer and coal quality detection circuit thereof | |
| KR102128024B1 (en) | Apparatus and method for sensing registance with ripple reduction | |
| CN212963725U (en) | Temperature measuring instrument | |
| CN216484461U (en) | On-line intelligent detection regulating valve | |
| SU1200206A1 (en) | Apparatus for measuring ratio of resistor current noise | |
| CN215768816U (en) | Crystal oscillator testing device | |
| CN213024794U (en) | Working circuit of atmospheric quality sensor capable of transmitting signals remotely | |
| CN212988621U (en) | Motor temperature detection device | |
| CN213455863U (en) | Infrared imaging probe capable of realizing 5G and LORA wireless output | |
| CN216978170U (en) | Temperature sensor circuit structure | |
| CN216117782U (en) | Small voltage signal sampling circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |