CN216771577U - Gas detector - Google Patents
Gas detector Download PDFInfo
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- CN216771577U CN216771577U CN202122621701.5U CN202122621701U CN216771577U CN 216771577 U CN216771577 U CN 216771577U CN 202122621701 U CN202122621701 U CN 202122621701U CN 216771577 U CN216771577 U CN 216771577U
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Abstract
The utility model discloses a gas detector, and relates to the technical field of gas detection. The gas detector includes: the gas detection sensor is used for detecting gas; a temperature sensor for detecting an ambient temperature; and the processor is respectively connected with the gas detection sensor and the temperature sensor and is used for acquiring the output voltage value of the temperature sensor and the output voltage value of the gas detection sensor. According to the embodiment of the utility model, the current environment temperature is used as a factor influencing the gas detection result by using the temperature sensor, the output voltage value of the gas detection sensor at the current environment temperature is converted into the voltage value at the standard temperature, and then the voltage value-gas concentration curve is compared, so that the gas concentration is calculated, the influence of the environment temperature on the gas detection result can be reduced to a certain extent, and the accuracy of the gas detection result is improved.
Description
Technical Field
The utility model relates to the technical field of gas detection, in particular to a gas detector.
Background
Some existing gas detectors use a catalytic combustion sensor, which increases the temperature with the increase of the concentration of combustible gas (hereinafter referred to as "gas"), so that the output voltage increases, and the measured gas concentration is obtained according to a known concentration-voltage curve. However, the concentration-voltage curve is obtained at a certain ambient temperature, which is changed in actual measurement, which may cause a certain systematic deviation of the measurement result.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a gas detector which can reduce the influence of the ambient temperature on the gas detection result.
According to the embodiment of the utility model, the gas detector comprises:
the gas detection sensor is used for detecting gas;
a temperature sensor for detecting an ambient temperature;
and the processor is respectively connected with the gas detection sensor and the temperature sensor and is used for acquiring the output voltage value of the temperature sensor and the output voltage value of the gas detection sensor.
The gas detector provided by the embodiment of the utility model at least has the following beneficial effects:
according to the gas detector provided by the embodiment of the utility model, the gas detection sensor, the temperature sensor and the processor are arranged, and the processor acquires the output voltage value of the temperature sensor and the output voltage value of the gas detection sensor, so that the gas concentration is calculated. According to the embodiment of the utility model, the current ambient temperature is used as the factor influencing the gas detection result by using the temperature sensor, so that the influence of the ambient temperature on the gas detection result can be reduced to a certain extent, and the accuracy of the gas detection result is improved.
According to some embodiments of the utility model, one end of the temperature sensor is connected to a fixed voltage end, the other end of the temperature sensor is connected in series with a fixed resistor to the ground, and the other end of the temperature sensor is connected to the processor.
According to some embodiments of the utility model, the temperature sensor comprises a thermistor.
According to some embodiments of the utility model, the gas detector further comprises:
and the wireless communication module is connected with the processor and is used for uploading the gas concentration value to a server.
According to some embodiments of the utility model, the wireless communication module comprises an NB-IOT module.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the following figures and examples, in which:
fig. 1 is a schematic structural diagram of a gas detector according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a gas sensor according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gas detector according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Some existing gas detectors use a catalytic combustion sensor, which increases the temperature with the increase of the concentration of combustible gas (hereinafter referred to as "gas"), so that the output voltage increases, and the measured gas concentration is obtained according to a known concentration-voltage curve. However, the concentration-voltage curve is obtained at a certain ambient temperature, which is changed in actual measurement, which may cause a certain systematic deviation of the measurement result. Especially when the ambient temperature difference is large, the resulting systematic deviation is unacceptable.
Based on the above, the embodiment of the utility model provides a gas detector, and the processor acquires the output voltage value of the temperature sensor and the output voltage value of the gas detection sensor by arranging the gas detection sensor, the temperature sensor and the processor, so as to calculate the gas concentration. According to the embodiment of the utility model, the current ambient temperature is used as the factor influencing the gas detection result by using the temperature sensor, so that the influence of the ambient temperature on the gas detection result can be reduced to a certain extent, and the accuracy of the gas detection result is improved.
The following describes the technical aspects of the present invention with reference to specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides a gas detector, including:
the gas detection sensor is used for detecting gas;
the temperature sensor is used for detecting the ambient temperature;
and the processor is respectively connected with the gas detection sensor and the temperature sensor and is used for acquiring the output voltage value of the temperature sensor and the output voltage value of the gas detection sensor.
In some embodiments, the processor calculates the present resistance value of the temperature sensor from the output voltage value of the temperature sensor by obtaining the output voltage value of the temperature sensor. Calculating the current environment temperature according to the temperature coefficient of the temperature sensor, the current resistance value of the temperature sensor and the standard resistance value of the temperature sensor; wherein, the standard resistance value of the temperature sensor is the resistance value of the temperature sensor at the standard temperature. Then, the output voltage value of the gas detection sensor is obtained, and the output voltage value of the gas detection sensor is converted into a voltage value at a standard temperature according to the current ambient temperature (the processor pre-stores the corresponding relationship between the current ambient temperature of the gas detection sensor, the output voltage value and the voltage value at the standard temperature, that is, the relationship curve between the voltage value of the gas detection sensor and the gas concentration according to the priori data). And calculating the gas concentration corresponding to the voltage value at the standard temperature according to the relation between the voltage value of the gas detection sensor and the gas concentration.
According to the embodiment of the utility model, the current environment temperature is taken as a factor influencing a gas detection result by using the temperature sensor, the output voltage value of the gas detection sensor at the current environment temperature is converted into the voltage value at the standard temperature, and then the voltage value-gas concentration curve is contrasted, so that the gas concentration is calculated, instead of directly using the output voltage value of the gas detection sensor at the current environment temperature to contrast the voltage value-gas concentration curve, so that the gas concentration is calculated, the influence of the environment temperature on the gas detection result can be reduced to a certain extent, and the accuracy of the gas detection result is improved.
In some embodiments, there is illustrated: if the processor calculates that the current environment temperature is 10 ℃, then the output voltage value of the acquired gas detection sensor is 1.50V, and the voltage converted into the voltage of 1.55V at the standard temperature (20 ℃). And calculating the gas concentration corresponding to the voltage value of 1.55V at the standard temperature according to the relation curve of the voltage value of the gas detection sensor and the gas concentration. The purpose of converting the voltage value is to reduce the influence of the external ambient temperature on the output voltage value of the gas detection sensor, i.e., the solution of the present embodiment is more accurate than directly using 1.50V to calculate the gas concentration. The conversion relation or the corresponding relation can be stored in the processor in advance, so that automatic conversion of the voltage value is realized.
In some embodiments, the gas detection sensor is coupled to a first pin of the processor and the temperature sensor is coupled to a second pin of the processor. The voltage value of the first pin of the processor is the output voltage value of the gas detection sensor, and the voltage value of the second pin of the processor is the output voltage value of the temperature sensor.
In some embodiments, as shown in FIG. 2, the temperature sensor is connected to a fixed voltage terminal Vcc at one end, connected in series with a fixed resistor R1 to ground at the other end, and connected to the processor at the other end. The present resistance value of the temperature sensor can be calculated using a series current equality method. According to the equal series current, Vcc/(Rntc + R1) ═ Vi/R1, there are:
Rntc＝R1*(Vcc/Vi-1) (1)
wherein Rntc is the current resistance value of the temperature sensor, R1 is the resistance value of the fixed resistor, Vcc is the voltage value of the fixed voltage terminal, and Vi is the output voltage value of the temperature sensor.
In some embodiments, the absolute temperature of the current ambient temperature is calculated using equation (2):
1/T2＝1/B*Ln(Rntc/R0)+1/T1 (2)
wherein, T2 is the absolute temperature of the current environment temperature, B is the temperature coefficient of the temperature sensor, Ln is the natural logarithm, R0 is the standard resistance value of the temperature sensor, T1 is the fixed value, and T1 is 273.15+ 25;
the current ambient temperature is calculated using equation (3):
T2'＝T2-273.15 (3)
where T2' is the current ambient temperature.
In some embodiments, T2 is the absolute temperature of the current ambient temperature, e.g., T2 — 303.15, then the celsius temperature is 303.15-273.15 — 30 ℃; b is the temperature coefficient of the temperature sensor, and is related to the selected element; rntc is the current resistance value of the temperature sensor calculated in the previous step, R0 is the resistance value of the temperature sensor at the standard temperature, which is related to the selected element, and this is 100K @25 ℃, i.e. R0 ═ 100K, and T1 ═ 273.15+ 25.
In some embodiments, the temperature sensor comprises a thermistor. The present embodiment selects the patch thermistor 4485K. It will be appreciated that the temperature sensor may also be other devices, such as a thermocouple sensor or the like.
In some embodiments, as shown in fig. 3, the gas detector further comprises:
and the wireless communication module is connected with the processor and used for uploading the gas concentration to the server.
In some embodiments, the processor sends the gas concentration to the server through the wireless communication module. The server generates data according to the gas concentration and sends the data to the terminal or displays the data on the display screen, so that management personnel or related personnel can conveniently realize measures of quickly positioning the alarm, giving an alarm, treating and the like, and the life and property safety can be ensured in multiple directions.
In some embodiments, the wireless communication module includes an NB-IOT module. It is understood that the wireless communication module may also be other communication modules, such as a Wi-Fi module, etc.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Claims (5)
1. Gas detector, its characterized in that includes:
the gas detection sensor is used for detecting gas;
a temperature sensor for detecting an ambient temperature;
and the processor is respectively connected with the gas detection sensor and the temperature sensor and is used for acquiring the output voltage value of the temperature sensor and the output voltage value of the gas detection sensor so as to calculate the gas concentration.
2. The gas sensor of claim 1, wherein said temperature sensor has one end connected to a fixed voltage terminal, another end connected in series with a fixed resistor to ground, and another end connected to said processor.
3. A gas sensor as claimed in claim 1, characterised in that the temperature sensor comprises a thermistor.
4. The gas sensor of claim 1, further comprising:
and the wireless communication module is connected with the processor and used for uploading the gas concentration to a server.
5. The gas sensor of claim 4, wherein the wireless communication module comprises an NB-IOT module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122621701.5U CN216771577U (en) | 2021-10-28 | 2021-10-28 | Gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122621701.5U CN216771577U (en) | 2021-10-28 | 2021-10-28 | Gas detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216771577U true CN216771577U (en) | 2022-06-17 |
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| CN202122621701.5U Active CN216771577U (en) | 2021-10-28 | 2021-10-28 | Gas detector |
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2021
- 2021-10-28 CN CN202122621701.5U patent/CN216771577U/en active Active
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