Temperature, humidity and pressure metering module capable of self-calibration

Abstract

A temperature, humidity and pressure metering module capable of self-calibration relates to the field of temperature, humidity and pressure monitoring equipment and is used for calibrating a temperature, humidity and pressure sensor. The self-calibration temperature, humidity and pressure metering module comprises a housing, a sensor assembly, a circuit board, a microprocessor, a calibration source assembly and a power supply module. The sensor assembly is arranged in the shell and comprises a temperature sensor, a humidity sensor and a pressure sensor; the circuit board is arranged in the shell, a signal conditioning circuit is arranged on the circuit board, and the temperature sensor, the humidity sensor and the pressure sensor are electrically connected with the signal conditioning circuit; the microprocessor is arranged on the circuit board and is electrically connected with the signal conditioning circuit; the calibration source assembly is arranged in the shell and comprises a temperature calibration source, a pressure calibration source and a humidity calibration source, and the temperature calibration source, the pressure calibration source and the humidity calibration source are all electrically connected with the microprocessor; the power supply module supplies power to the microprocessor, the sensor assembly and the calibration source assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of temperature, humidity and pressure monitoring equipment, in particular to a self-calibrating temperature, humidity and pressure measurement module. BACKGROUND

[0002] In many fields, such as industrial production, environmental monitoring, weather forecasting, warehouse logistics and the operating environment control of precision instruments and equipment, it is crucial to accurately measure temperature, humidity and pressure (hereinafter referred to as temperature, humidity and pressure) parameters.

[0003] Although existing temperature, humidity and pressure measurement equipment or modules can achieve basic measurement functions, the measurement accuracy will gradually decrease due to environmental factors and component aging during long-term use, resulting in deviations in the detection results.

[0004] Traditional calibration methods often require the use of external high-precision standard sources, and the measurement module needs to be disassembled and sent to a professional calibration laboratory for calibration, which is cumbersome, time-consuming and labor-intensive. CONTENT OF THE INVENTION

[0005] The present application provides a self-calibrating temperature, humidity and pressure measurement module for calibrating temperature, humidity and pressure sensors.

[0006] The present application provides a self-calibrating temperature, humidity and pressure measurement module, comprising a housing, a sensor assembly, a circuit board, a microprocessor, a calibration source assembly and a power module; the housing has a ventilation hole; the sensor assembly is arranged in the housing, the sensor assembly is in communication with the ventilation hole, and the sensor assembly comprises a temperature sensor, a humidity sensor and a pressure sensor; the circuit board is arranged in the housing, and a signal conditioning circuit is arranged on the circuit board; the temperature sensor, the humidity sensor and the pressure sensor are electrically connected to the signal conditioning circuit; the microprocessor is arranged on the circuit board, and the microprocessor is electrically connected to the signal conditioning circuit; the calibration source assembly is arranged in the housing, and the calibration source assembly is adjacent to the sensor assembly; the calibration source assembly comprises a temperature calibration source, a pressure calibration source and a humidity calibration source, and the temperature calibration source, the pressure calibration source and the humidity calibration source are electrically connected to the microprocessor; the power module is electrically connected to the circuit board, and the power module supplies power to the microprocessor, the sensor assembly and the calibration source assembly.

[0007] The sensor assembly in the shell in the present application can detect temperature, humidity and air pressure information through the air at the vent, and the power module and the circuit board, the microprocessor can support the work of the sensor assembly; the calibration source assembly is further arranged in the shell, and the calibration source assembly comprises a temperature calibration source, a pressure calibration source and a humidity calibration source; the temperature calibration source, the pressure calibration source and the humidity calibration source can quantitatively change the temperature, humidity and pressure information in the environment through the microprocessor control, and the microprocessor can calibrate the sensor assembly according to the difference between the temperature, humidity and pressure information change of the sensor assembly and the difference between the change value of the calibration source assembly to the environment, so that the temperature, humidity and pressure information detected by the sensor assembly is more accurate.

[0008] In some embodiments of the present application, the self-calibrating temperature, humidity and pressure measurement module further comprises a closed shell and a door body, the closed shell is provided with a calibration inspection port, the door body is arranged at the calibration inspection port, the door body can open or close the calibration inspection port, and the calibration source assembly is arranged in the closed shell.

[0009] The closed shell and the door body can protect the calibration source assembly, which is only used when the sensor assembly needs to be calibrated, so as to avoid damage of the calibration source assembly itself due to environmental factors, and also avoid the influence of the calibration source assembly on the sensor assembly.

[0010] In some embodiments of the present application, the self-calibrating temperature, humidity and pressure measurement module further comprises a power member, the power member is arranged in the shell, the power member is electrically connected with the microprocessor, the power member is electrically connected with the power module, and the power member is in transmission connection with the door body. The power member can drive the door body to open or close the calibration inspection port.

[0011] The power member can realize automatic opening and closing of the calibration source assembly, automatic calibration can be realized, and after the calibration work is completed, automatic closing can be realized again, so that stable protection effect of the calibration source assembly is realized.

[0012] In some embodiments of the present application, the self-calibrating temperature, humidity and pressure measurement module further comprises a clock chip, the clock chip is arranged on the circuit board, the clock chip is electrically connected with the microprocessor, and the clock chip is electrically connected with the power module. The clock chip can provide time information for the microprocessor, so as to facilitate the microprocessor to calibrate the sensor assembly at a specified time or at a specified time interval.

[0013] In some embodiments of the present application, the self-calibrating temperature, humidity and pressure measurement module further comprises a sealing strip, the sealing strip is arranged at the calibration inspection port of the door body and the closed shell, and the sealing strip is fixedly connected with one of the closed shell and the door body. The sealing strip can improve the sealing property of the sealed shell, so as to avoid dust and water vapor from entering.

[0014] In some embodiments of the present application, two sealing strips are arranged, and the two sealing strips are fixedly arranged at the calibration inspection openings of the door body and the closed shell respectively, and the two sealing strips can abut against each other. The two sealing strips can further improve the sealing effect.

[0015] In some embodiments of the present application, the temperature calibration source comprises a high-precision thermistor or a platinum resistance combined with a temperature control circuit. The temperature range that can be detected by the structure is-20℃~80℃, the precision is ±0.5℃, the stable and accurate temperature change can be provided, and the microprocessor can calibrate the data of the temperature sensor.

[0016] In some embodiments of the present application, the humidity calibration source is a high-molecular humidity generating element. The humidity detection range of the structure is 10% RH~95% RH, the precision is ±2% RH, the stable and accurate humidity change can be provided, and the microprocessor can calibrate the data of the humidity sensor.

[0017] In some embodiments of the present application, the pressure calibration source is a high-precision electronic pressure generator or a piston pressure gauge. The structure can provide a pressure change in the range of 0kPa~100kPa, and the precision is ±0.1kPa, so that the microprocessor can calibrate the data of the pressure sensor.

[0018] In some embodiments of the present application, the signal conditioning circuit comprises a high-precision operational amplifier, a filter chip and a high-speed analog-to-digital converter connected in sequence. The signal conditioning circuit can convert the sensing information in the sensor assembly into corresponding temperature, humidity and pressure information. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the technical scheme of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0020] Figure 1 A schematic view of a self-calibrating temperature and humidity pressure metering module provided by the embodiments of the present application.

[0021] Figure 2 A side view partial schematic view of a self-calibrating temperature and humidity pressure metering module provided by the embodiments of the present application.

[0022] Fig. 1 is a schematic view of a self-calibrating temperature and humidity pressure metering module provided by the embodiments of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0025] The terms "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0026] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, "connected" and "connected" in the present application have the meaning of conducting. The specific meaning needs to be understood in combination with the context.

[0027] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words such as "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0028] In many fields, such as industrial production, environmental monitoring, weather forecasting, warehouse logistics and operation environment control of precision instruments and equipment, it is very important to accurately measure temperature, humidity and pressure (hereinafter referred to as temperature, humidity and pressure) parameters.

[0029] Although the existing temperature, humidity and pressure measurement equipment or module can realize basic measurement function, due to the influence of environmental factors, component aging and other factors during long-term use, the measurement accuracy will gradually decrease, resulting in deviation of the detection result.

[0030] Traditional calibration methods often need to use external high-precision standard sources, and the metering module needs to be disassembled and sent to a professional calibration laboratory for calibration, which is complicated, time-consuming and laborious.

[0031] Therefore, referring to Figure 1 , the application provides a self-calibrating temperature and humidity pressure metering module, which comprises a shell 1, a sensor assembly 2, a circuit board 3, a microprocessor 4, a calibration source assembly 5 and a power module.

[0032] Please refer to Figure 1 , the shell 1 has a ventilation hole 11. The shell 1 is made of a sealing and protective material, such as aluminum alloy or plastic material, for protecting the internal electronic components from the interference and damage of the external environment. The shell 1 is provided with a ventilation hole 11 for the sensor to sense the temperature, humidity and pressure of the external environment. The ventilation hole 11 can be a round hole or a square hole, and can be one or more.

[0033] Please refer to Figure 1 , the sensor assembly 2 is arranged in the shell 1, and the sensor assembly 2 is in communication with the ventilation hole 11. The sensor assembly 2 comprises a temperature sensor 21, a humidity sensor 22 and a pressure sensor 23. The temperature and humidity pressure sensor assembly 2 is installed inside the shell 1 near the ventilation hole 11.

[0034] Please refer to Figure 1 , wherein the temperature sensor 21 can be a high-precision platinum resistance temperature sensor 21, which has the advantages of high measurement accuracy, good stability and fast response speed; the humidity sensor 22 can be a capacitive humidity sensor 22, which can accurately measure the environmental humidity; the pressure sensor 23 can be a piezoresistive pressure sensor 23, which is sensitive to pressure changes and can accurately measure the environmental pressure.

[0035] Please refer to Figure 1 , the circuit board 3 is arranged in the shell 1, and the circuit board 3 is provided with a signal conditioning circuit. The temperature sensor 21, the humidity sensor 22 and the pressure sensor 23 are respectively electrically connected with the signal conditioning circuit. The circuit board 3 can include a substrate and a printed circuit. The signal conditioning circuit can be printed and can be part of the circuit on the circuit board 3. The substrate of the circuit board 3 can be any one of phenolic paper substrate, epoxy glass fiber substrate and polyimide substrate. The circuit board 3 can also be provided with a packaging layer and a solder resist layer to protect the circuit board 3.

[0036] The signal conditioning circuit can include an operational amplifier, a filter and an analog-to-digital converter. The operational amplifier amplifies the weak electrical signal output by the sensor, so that the amplitude meets the input requirements of the analog-to-digital converter; the filter uses a combination of low-pass and high-pass filters to effectively filter out high-frequency noise and low-frequency interference signals in the signal, improving the quality of the signal; the analog-to-digital converter converts the amplified and filtered analog signal into a digital signal and transmits it to the microprocessor 4. The signal conditioning circuit can also include other parallel interfaces, digital-to-analog converters, etc., to meet more functional requirements.

[0037] Please refer to Figure 1 The microprocessor 4 is arranged on the circuit board 3, and the microprocessor 4 is electrically connected with the signal conditioning circuit. The microprocessor 4 can adopt a low-power single-chip microcomputer to realize signal processing and corresponding actions through internal peripheral resources and a certain capacity of memory.

[0038] Please refer to Figure 1 After the microprocessor 4 receives the digital signals transmitted by the signal conditioning circuit, the microprocessor 4 analyzes and calculates these signals according to a preset algorithm to obtain the temperature value, humidity value and pressure value of the current environment; during normal measurement, the microprocessor 4 reads the pre-stored calibration parameters from the internal memory and performs calibration compensation operation on the measurement value to obtain accurate temperature, humidity and pressure measurement results.

[0039] Please refer to Figure 1 During calibration, the microprocessor 4 controls the internal calibration source component 5 to generate standard temperature, humidity and pressure signals, and simultaneously reads the measurement values of the standard signals by the temperature, humidity and pressure sensor component 2. By comparing the differences between the measurement values and the standard values, the microprocessor 4 calculates and updates the calibration parameters in the internal memory by using the built-in calibration algorithm, thereby realizing the self-calibration function.

[0040] Please refer to Figure 1 The calibration source component 5 is arranged in the shell 1, and the calibration source component 5 is adjacent to the sensor component 2. The calibration source component 5 includes a temperature calibration source 51, a pressure calibration source 53 and a humidity calibration source 52, and the temperature calibration source 51, the pressure calibration source 53 and the humidity calibration source 52 are electrically connected with the microprocessor 4.

[0041] Please refer to Figure 1 The temperature calibration source 51 in the calibration source component 5 can use a high-precision platinum resistance as a heating element, and combine with a precise temperature control circuit to accurately generate the required standard temperature value in the range of-20℃~80℃ by controlling the size and time of the heating current through the microprocessor 4, and the precision can reach ±0.5℃.

[0042] Please refer to Figure 1The humidity calibration source 52 can adopt a high-molecular humidity generating element. The high-molecular humidity generating element can be controlled by the microprocessor 4 to generate a standard humidity signal with a precision of ±2% RH in a humidity range of 10% RH to 95% RH.

[0043] Please refer to Figure 1 The pressure calibration source 53 can adopt a small electronic pressure generator. Based on the pressure sensor 23 and a feedback control circuit, the pressure calibration source 53 can generate a standard pressure signal with a precision of ±0.1 kPa in a pressure range of 0 kPa to 100 kPa.

[0044] Please refer to Figure 1 The power module is electrically connected to the circuit board 3, and the power module supplies power to the microprocessor 4, the sensor assembly 2, and the calibration source assembly 5. The power module can include a rechargeable lithium battery and a power management circuit. The lithium battery provides stable power supply for the entire module, and the power management circuit is responsible for charging control, voltage stabilization, low-power consumption management, and other operations of the lithium battery.

[0045] During the charging process, the power management circuit can accurately control the stages of constant-current charging and constant-voltage charging to prevent overcharging and overdischarging of the lithium battery. At the same time, when the module is in standby or low-power consumption state, the power management circuit automatically reduces the output power of the power supply to prolong the service life of the lithium battery and ensure stable operation of the module in different working states.

[0046] Please refer to Figure 1 The sensor assembly 2 in the shell 1 in the present application can detect temperature, humidity, and air pressure information through the air vents 11. The power module and the circuit board 3, the microprocessor 4 can support the work of the sensor assembly 2.

[0047] Please refer to Figure 1 The shell 1 also has a calibration source assembly 5, and the calibration source assembly 5 includes a temperature calibration source 51, a pressure calibration source 53, and a humidity calibration source 52. The temperature calibration source 51, the pressure calibration source 53, and the humidity calibration source 52 can be controlled by the microprocessor 4 to quantitatively change the temperature, humidity, and pressure information in the environment. The microprocessor 4 can calibrate the detection data of the sensor assembly 2 according to the difference between the temperature, humidity, and pressure information changes of the sensor assembly 2 and the difference between the changes of the calibration source assembly 5 to the environment, so that the temperature, humidity, and pressure information detected by the sensor assembly 2 is more accurate.

[0048] Please refer to Figure 2 In some examples, the self-calibrating temperature, humidity, and pressure metering module also includes a closed housing 6 and a door body 7. The closed housing 6 is provided with a calibration inspection port 61, and the door body 7 is arranged at the calibration inspection port 61. The door body 7 can open or close the calibration inspection port 61, and the calibration source assembly 5 is arranged in the closed housing 6.

[0049] The closed shell 6 and the door body 7 can protect the calibration source assembly 5, and are used only when the sensor assembly 2 needs to be calibrated, so as to avoid damage of the calibration source assembly 5 itself due to environmental factors and influence of the calibration source assembly 5 on the sensor assembly 2.

[0050] In some examples, the closed shell 6 can be made of aluminum alloy, plastic or other materials, the door body 7 can be made of the same material as the closed shell 6, and the two can be connected in a sliding manner, and the sliding direction can be vertical or horizontal. The two can be provided with sliding rails or other directional sliding structures.

[0051] Please refer to Figure 2 It should be noted that when the closed shell 6 and the door body 7 are arranged, a gap is formed between the pressure calibration source 53 generator and the pressure sensor 23. At this time, a corresponding walking structure such as a linear motor or a ball screw structure can be arranged to move the pressure calibration source 53 to a specified position to apply the expected pressure when the pressure calibration source 53 needs to pressurize the pressure sensor 23.

[0052] Please refer to Figure 1 In some examples, the self-calibrating temperature and humidity pressure measurement module further comprises a power member 71 arranged in the housing 1, the power member 71 is electrically connected with the microprocessor 4 and the power supply module, and the power member 71 is in transmission connection with the door body 7. The power member 71 can drive the door body 7 to open or close the calibration inspection port 61.

[0053] The power member 71 can automatically open and close the calibration source assembly 5, realize automatic calibration, and automatically close after the calibration is completed, so as to realize stable protection of the calibration source assembly 5.

[0054] In some examples, the power member 71 can be a rotary motor or a linear motor. When the power member 71 is a rotary motor, a corresponding toothed strip can be matched with the power member 71, and a corresponding toothed groove can be arranged on the door body 7, so that the rotary motor can drive the door body 7 to open and close.

[0055] Please refer to Figure 1 In some examples, the self-calibrating temperature and humidity pressure measurement module further comprises a clock chip 41 arranged on the circuit board 3, the clock chip 41 is electrically connected with the microprocessor 4 and the power supply module. The clock chip 41 can provide time information for the microprocessor 4, so as to facilitate the microprocessor 4 to calibrate the sensor assembly 2 at a specified time or at a specified time interval.

[0056] In some examples, the clock chip 41 can be integrated into the microprocessor 4 or be a separate clock chip 41, so that the microprocessor 4 can calibrate the sensor assembly 2 in time.

[0057] In some examples, the self-calibrating temperature and humidity pressure measurement module further comprises a sealing strip arranged at the calibration inspection port 61 of the door body 7 and the closed shell 6, and the sealing strip is fixedly connected with one of the closed shell 6 and the door body 7. The sealing strip can improve the sealing performance of the closed shell to prevent dust and water vapor from entering.

[0058] In some examples, the sealing strip can be a rubber strip or a plastic strip, as long as it can fill the gap between the closed shell 6 and the door body 7.

[0059] In some examples, two sealing strips are arranged, and the two sealing strips are fixedly arranged at the calibration inspection port 61 of the door body 7 and the closed shell 6, respectively, and can abut against each other. The two sealing strips can further improve the sealing effect.

[0060] In some examples, the two sealing strips can be identical, and the two sealing strips can be fixedly connected with the outer walls of the door body 7 and the closed shell 6, respectively. The sealing strips can be fixed by adhesion, clamping or other connection methods.

[0061] Please refer to Figure 1 In some examples, the temperature calibration source 51 comprises a high-precision thermistor or platinum resistance combined with a temperature control circuit. The temperature range that can be detected by this structure is -20°C~80°C, and the accuracy is ±0.5°C. This structure can provide stable and accurate temperature changes, which is convenient for the microprocessor 4 to calibrate the data of the temperature sensor 21.

[0062] Please refer to Figure 1 In some examples, the humidity calibration source 52 is a high-molecular humidity generating element. The humidity detection range of this structure is 10% RH~95% RH, and the accuracy is ±2% RH. This structure can provide stable and accurate humidity changes, which is convenient for the microprocessor 4 to calibrate the data of the humidity sensor 22.

[0063] Please refer to ​ In some examples, the pressure calibration source 53 is a high-precision electronic pressure generator or a piston pressure gauge. This structure can provide a pressure change ranging from 0kPa to 100kPa, with an accuracy of ±0.1kPa. This structure is convenient for the microprocessor 4 to calibrate the data of the pressure sensor 23.

[0064] In some examples, the signal conditioning circuit comprises a high-precision operational amplifier, a filter chip and a high-speed analog-to-digital converter connected in sequence. The signal conditioning circuit can convert the sensing information in the sensor assembly 2 into corresponding temperature and humidity pressure information.

[0065] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in an appropriate manner.

[0066] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A self-calibratable temperature-humidity barometric metrology module, characterized by, include: The outer casing has ventilation holes; A sensor assembly is disposed within the housing and communicates with the ventilation hole. The sensor assembly includes a temperature sensor, a humidity sensor, and a pressure sensor. A circuit board is disposed inside the housing, and a signal conditioning circuit is disposed on the circuit board. The temperature sensor, the humidity sensor and the pressure sensor are electrically connected to the signal conditioning circuit respectively. A microprocessor is disposed on the circuit board and is electrically connected to the signal conditioning circuit. A calibration source assembly is disposed within the housing and is adjacent to the sensor assembly. The calibration source assembly includes a temperature calibration source, a pressure calibration source, and a humidity calibration source, all of which are electrically connected to the microprocessor. A power module is electrically connected to the circuit board, and the power module supplies power to the microprocessor, the sensor assembly, and the calibration source assembly.

2. The self-calibrating temperature, humidity, and pressure metering module according to claim 1, characterized in that, The self-calibrating temperature, humidity and pressure metering module also includes a closed housing and a door. The closed housing is provided with a calibration inspection port, and the door is located at the calibration inspection port. The door can open or close the calibration inspection port, and the calibration source component is located inside the closed housing.

3. The self-calibrating temperature, humidity, and pressure metering module according to claim 2, characterized in that, The self-calibrating temperature, humidity and pressure measurement module also includes a power component, which is disposed inside the housing. The power component is electrically connected to the microprocessor, the power component is electrically connected to the power module, and the power component is drively connected to the door. The power component can drive the door and open or close the calibration and inspection port.

4. The self-calibrating temperature, humidity, and pressure metering module according to claim 3, characterized in that, The self-calibrating temperature, humidity and pressure measurement module also includes a clock chip, which is disposed on the circuit board and electrically connected to the microprocessor and the power supply module.

5. The self-calibrating temperature, humidity, and pressure metering module according to claim 2, characterized in that, The self-calibrating temperature, humidity and pressure metering module also includes a sealing strip, which is disposed at the calibration and inspection port of the door and the closed housing, and is fixedly connected to one of the closed housing and the door.

6. The self-calibrating temperature, humidity, and pressure metering module according to claim 5, characterized in that, The sealing strip is provided in two parts, and the two sealing strips are respectively fixedly installed at the calibration and inspection port of the door body and the closed shell, and the two sealing strips can abut against each other.

7. The self-calibrating temperature, humidity, and pressure metering module according to any one of claims 1 to 6, characterized in that, The temperature calibration source includes a high-precision thermistor or platinum resistance thermometer combined with a temperature control circuit.

8. The self-calibrating temperature, humidity, and pressure metering module according to any one of claims 1 to 6, characterized in that, The humidity calibration source is a polymer humidity generating element.

9. The self-calibratable temperature-humidity-pressure metrology module according to any one of claims 1-6, characterized in that, the pressure calibration source is a high-precision electronic pressure generator or a piston gauge.

10. The self-calibratable temperature-humidity-pressure metrology module according to claim 1, characterized in that, the signal conditioning circuit comprises a high-precision operational amplifier, a filter chip and a high-speed analog-to-digital converter connected in sequence.

Images