Adaptive wireless passive temperature sensor testing method

Abstract

The invention belongs to the technical field of sensors, and particularly relates to a self-adaptive wireless passive temperature sensor testing method, which comprises the following steps that wireless transmitting equipment is started and transmits an excitation signal, and a passive wireless temperature sensor returns a to-be-tested signal subjected to frequency conversion to wireless receiving testing equipment after receiving the excitation signal transmitted by the wireless transmitting equipment. At the moment, the power of the transmitted signal is gradually increased, the power of the to-be-measured signal is also gradually increased, if the power of the transmitted signal is increased to the power threshold value of the passive wireless temperature sensor, the to-be-measured signal subjected to frequency conversion is self-locked, and the power of the to-be-measured signal does not change along with the change of the power of the input signal; if yes, the passive wireless temperature sensor works normally; otherwise, the passive wireless temperature sensor works abnormally. According to the method, the power change of the input signal is utilized to detect the frequency change of the output signal, and when the frequency does not change any more, the working condition of the sensor can be judged through the frequency.

Description

Technical Field

[0001] The invention belongs to the technical field of sensors, and in particular relates to a method for testing an adaptive wireless passive temperature sensor. Background Art

[0002] In the development process of the new generation of passive wireless temperature sensors, testing the sensors is a necessary process, and the research on the test methods for new passive wireless temperature sensors is crucial. The conventional test method of passive wireless temperature sensors generally makes judgments based on the transmitted input signal and then tests the returned output signal. This method has many disadvantages in test efficiency, measurement accuracy, convenience and test cost.

[0003] In addition, there are no passive wireless temperature sensors with different transmission frequencies and return frequencies on the market, so the existing methods cannot be applied to such variable-frequency passive wireless temperature sensors. Summary of the invention

[0004] In view of the above problems existing in the prior art, an adaptive wireless passive temperature sensor testing method is proposed. The method can measure the output frequency of the sensor on the passive wireless temperature sensor. By measuring whether the frequency can achieve stable self-locking, it is determined whether the sensor is working normally, thereby realizing adaptive testing.

[0005] In order to achieve the above effects, the technical solution adopted by the present invention is as follows: A self-adaptive wireless passive temperature sensor testing method comprises the following steps: preparing a wireless transmitting device, a wireless receiving test device and a passive wireless temperature sensor; starting the wireless transmitting device and sending an excitation signal; after the passive wireless temperature sensor receives the excitation signal sent by the wireless transmitting device, it returns a frequency-converted signal to be tested to the wireless receiving test device; at this time, the power of the transmitting signal is gradually increased, and the power of the signal to be tested is also gradually increased; if the power of the transmitting signal is increased to a power threshold of the passive wireless temperature sensor, the frequency-converted signal to be tested is self-locked, and the power of the signal to be tested no longer changes with the change of the input signal power, it indicates that the passive wireless temperature sensor is working normally; otherwise, it indicates that the passive wireless temperature sensor is working abnormally.

[0006] Further, specifically Step 1: Set the transmission frequency of the wireless transmitter to f pump The transmitting signal is set to a low power state. Step 2: Place the passive wireless temperature sensor in a location that can receive the frequency f emitted by the transmitter. pump within the scope of Step 3: The intact passive wireless temperature sensor receives f pumpAfter the signal is received, it will generate a frequency f to be measured. r At this time, the wireless receiving test equipment will r Signal retraction display; Step 4: Gradually increase the f emitted by the wireless transmitter pump The signal power is measured on the wireless receiving test equipment. r How the signal changes; Step 5: By observing f r The signal changes are judged by f pump As the signal power increases, if the wireless receiving test equipment detects a stable fixed frequency that does not change with the increase in power, it means that the sensor is working properly; otherwise, it means that the passive wireless temperature sensor is not working properly.

[0007] Furthermore, the wireless transmitting device includes a signal source, a transmitting front end and an antenna, and its function is to provide a transmitting signal for the passive wireless temperature sensor to be tested to receive wireless signals; the frequency provided is f pump The microwave signal can change f pump output power.

[0008] Furthermore, the wireless receiving test equipment includes a spectrum analyzer, a receiving front end and an antenna, and its function is to receive the frequency-converted signal f returned by the sensor. r , which can display the received signal to be tested f r changes.

[0009] Furthermore, after obtaining a fixed frequency output by increasing the transmission signal power, the frequency of the signal, the signal power, the transmission efficiency and the output efficiency are obtained accordingly according to the output frequency.

[0010] Furthermore, if the wireless receiving test device cannot receive the signal to be tested during the process of increasing the power of the transmitted signal, it means that the passive wireless temperature sensor is not working properly.

[0011] Furthermore, if the frequency of the signal to be tested received by the wireless receiving test device is disordered during the process of increasing the power of the transmitted signal, it means that the passive wireless temperature sensor is not working properly.

[0012] The technical effects achieved by the present invention are: This method uses the power change of the input signal to detect the frequency change of the output signal according to the characteristics of the new passive wireless. When the frequency no longer changes, the working condition of the sensor can be judged by the frequency. The output frequency, signal strength, transmission efficiency, output efficiency and other indicators of the passive wireless temperature sensor are adaptively tested.

[0013] This application is aimed at temperature sensors with passive wireless frequency conversion signal generation, and determines whether the sensor is in a normal working state by testing the frequency locking characteristics of the signal sent by the sensor. It can be completed using any wireless transmitting device. As the transmission power gradually increases, the return frequency will be a locked frequency, which will no longer change with the increase of transmission power, so as to achieve the purpose of adaptive testing by increasing the power and observing the returned frequency.

[0014] There is no such passive wireless temperature sensor on the market with different transmitting and returning frequencies, so there is no way to detect the returned frequency conversion frequency. This method detects whether the frequency after frequency conversion is locked, so this method can also be used in subsequent passive wireless frequency conversion sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a technical background schematic.

[0016] Figure 2 This is the test principle block diagram.

[0017] Figure 3-Figure 4 This is a graph showing the change in output signal frequency. DETAILED DESCRIPTION

[0018] The adaptive wireless passive temperature sensor testing method mainly performs the input of the transmission signal power and the output of the detection frequency signal through the wireless transmitting device and the wireless receiving test device respectively, so as to judge whether the passive wireless temperature sensor is in a normal working state, and the output frequency index of the signal can be further obtained according to the output.

[0019] The specific implementation process of the test method is as follows Figure 2 As shown, the power of the signal transmitting device is increased so that the passive wireless temperature sensor to be tested receives a signal with increasing power. After receiving the signal, according to the frequency characteristics of the passive wireless temperature sensor, the output signal changes with the power of the input excitation signal under the condition of low-power signal excitation. As the power of the input excitation signal increases, when a certain threshold condition is reached, the frequency of the output signal no longer changes with the increase of the input signal power.

[0020] Example 1 A method for testing an adaptive wireless passive temperature sensor includes the following steps: preparing a wireless transmitting device, a wireless receiving test device and a passive wireless temperature sensor; starting the wireless transmitting device and sending an excitation signal, after the passive wireless temperature sensor receives the excitation signal sent by the wireless transmitting device, it returns the signal to be tested after frequency conversion to the wireless receiving test device, at this time, the power of the transmitting signal is gradually increased, and the power of the signal to be tested is also gradually increased, if the power of the transmitting signal increases to the power threshold of the passive wireless temperature sensor, the signal to be tested after frequency conversion is self-locked, and the power of the signal to be tested no longer changes with the change of the input signal power, then it means that the passive wireless temperature sensor is working normally; otherwise, it means that the passive wireless temperature sensor is not working properly. The test purpose of this method is mainly to detect whether the passive wireless temperature sensor is working properly. According to the principle of stimulated radiation, whether this type of passive wireless temperature sensor with frequency conversion is working properly can be determined by whether it can return a stable fixed frequency that does not change with the increase of power. If the locked frequency is detected, it means that the sensor is working properly. If the phenomenon of frequency conversion to locked frequency is not detected, it means that it is not working properly.

[0021] This method is changed to only detect the frequency of the signal, and other indicators are no longer tested. The quality of the sensor is judged by measuring the frequency. The frequency is measured by a wireless receiving device. In this method, the measurement can be performed by any spectrum device, such as a spectrum analyzer.

[0022] Example 2 An adaptive wireless passive temperature sensor testing method comprises the following steps: Step 1: Set the transmission frequency of the wireless transmitter to f pump The transmitting signal is set to a low power state. Step 2: Place the passive wireless temperature sensor in a location that can receive the frequency f emitted by the transmitter. pump within the scope of Step 3: The intact passive wireless temperature sensor receives f pump After the signal is received, it will generate a frequency f to be measured. r At this time, the wireless receiving test equipment will r Signal retraction display; Step 4: Gradually increase the f emitted by the wireless transmitter pump The signal power is measured on the wireless receiving test equipment. r How the signal changes; Step 5: By observing f r The signal changes are judged by f pumpAs the signal power increases, if the wireless receiving test equipment detects a stable fixed frequency that does not change with the increase in power, it means that the sensor is working properly; otherwise, it means that the passive wireless temperature sensor is not working properly.

[0023] The test purpose of this method is mainly to detect whether the passive wireless temperature sensor is working properly. According to the principle of stimulated radiation, whether this type of variable frequency passive wireless temperature sensor is working properly can be determined by whether it can return a stable fixed frequency that does not change with the increase of power. If the locked frequency is detected, it means that the sensor is working properly. If the phenomenon of frequency conversion to locked frequency is not detected, it means that it is not working properly.

[0024] This method is changed to only detect the frequency of the signal, and other indicators are no longer tested. The quality of the sensor is judged by measuring the frequency. The frequency is measured by a wireless receiving device. In this method, the measurement can be performed by any spectrum device, such as a spectrum analyzer.

[0025] Example 3 A self-adaptive wireless passive temperature sensor testing method comprises the following steps: preparing a wireless transmitting device, a wireless receiving test device and a passive wireless temperature sensor; starting the wireless transmitting device and sending an excitation signal, after the passive wireless temperature sensor receives the excitation signal transmitted by the wireless transmitting device, returning a frequency-converted signal to be tested to the wireless receiving test device, at which time the power of the transmitting signal is gradually increased, and the power of the signal to be tested is also gradually increased; if the power of the transmitting signal is increased to the power threshold of the passive wireless temperature sensor, the frequency-converted signal to be tested is self-locked, and the power of the signal to be tested no longer changes with the change of the input signal power, it means that the passive wireless temperature sensor is working normally; otherwise, it means that the passive wireless temperature sensor is not working properly.

[0026] Specifically Step 1: Set the transmission frequency of the wireless transmitter to f pump The transmitting signal is set to a low power state. Step 2: Place the passive wireless temperature sensor in a location that can receive the frequency f emitted by the transmitter. pump within the scope of Step 3: The intact passive wireless temperature sensor receives f pump After the signal is received, it will generate a frequency f to be measured. r At this time, the wireless receiving test equipment will r Signal retraction display; Step 4: Gradually increase the f emitted by the wireless transmitter pump The signal power is measured on the wireless receiving test equipment. r How the signal changes; Step 5: By observing f r The signal changes are judged by f pump As the signal power increases, if the wireless receiving test equipment detects a stable fixed frequency that does not change with the increase in power, it means that the sensor is working properly; otherwise, it means that the passive wireless temperature sensor is not working properly.

[0027] The wireless transmitting device includes a signal source, a transmitting front end and an antenna. Its function is to provide a transmitting signal for the passive wireless temperature sensor to be tested to receive the wireless signal. The wireless transmitting device can be a product that can be directly purchased on the market. The frequency it provides is f pump The microwave signal can change f pump output power.

[0028] The wireless receiving test equipment includes a spectrum analyzer, a receiving front end and an antenna. Its function is to receive the frequency-converted signal f returned by the sensor. r The wireless transmitting device can be a product that can be directly purchased on the market, which can display the received signal to be tested f r changes.

[0029] After obtaining a fixed frequency output by increasing the transmission signal power, the frequency, signal power, transmission efficiency and output efficiency of the signal are obtained according to the output frequency.

[0030] If the wireless receiving test device cannot receive the signal to be tested while the power of the transmitted signal increases, it means that the passive wireless temperature sensor is not working properly.

[0031] If the frequency of the signal to be tested received by the wireless receiving test device is disordered during the process of increasing the power of the transmitted signal, it means that the passive wireless temperature sensor is not working properly.

[0032] The test purpose of this method is mainly to detect whether the passive wireless temperature sensor is working properly. According to the principle of stimulated radiation, whether this type of variable frequency passive wireless temperature sensor is working properly can be determined by whether it can return a stable fixed frequency that does not change with the increase of power. If the locked frequency is detected, it means that the sensor is working properly. If the phenomenon of frequency conversion to locked frequency is not detected, it means that it is not working properly.

[0033] This method is changed to only detect the frequency of the signal, and other indicators are no longer tested. The quality of the sensor is judged by measuring the frequency. The frequency is measured by a wireless receiving device. In this method, the measurement can be performed by any spectrum device, such as a spectrum analyzer.

[0034] like Figure 1 As shown, it is due to microwave stimulated frequency conversion. When the frequency is f pump The pump microwave (whose energy is h·fpump , where h is Planck's constant) is fed into the sensor device, it will simultaneously radiate a frequency of f r Electromagnetic waves (whose energy is h·f r ) and an electromagnetic wave with a frequency of fa. The frequency relationship of each signal can be expressed as: f pump = f r + f a Therefore, the transmitted signal is f pump , the recovery signal is f r and f a Where f r The signal has the same frequency as the input signal f pump The increase of power changes the characteristics, and f pump When the power increases to a certain level, f r No longer changes.

[0035] The specific implementation process of the test method is as follows Figure 2 As shown, the power of the signal transmitting device is increased so that the passive wireless temperature sensor to be tested receives a signal with increasing power. After receiving the signal, according to the frequency characteristics of the passive wireless temperature sensor, the output signal changes with the power of the input excitation signal under the condition of low-power signal excitation. As the power of the input excitation signal increases, when a certain threshold condition is reached, the frequency of the output signal no longer changes with the increase of the input signal power.

[0036] like Figure 3-Figure 4 As shown in the figure, the output signal fr is the signal to be tested returned by the sensor. When the frequency is not stable, f1 is a frequency signal that changes with the input signal power. After reaching the input power threshold condition, the output signal f2 will become a fixed signal, and the frequency will no longer change with the input power. According to this phenomenon, by only increasing the input signal power, it is possible to adaptively measure whether the passive wireless temperature sensor is in a normal working state based on whether it has a stable frequency output. If the frequency cannot be locked to a fixed frequency, it means that the sensor is not working properly.

Claims

1. An adaptive wireless passive temperature sensor testing method, characterized in that: Prepare a wireless transmitting device, a wireless receiving test device and a passive wireless temperature sensor; Start the wireless transmitting device and send out an excitation signal. After the passive wireless temperature sensor receives the excitation signal transmitted by the wireless transmitting device, it returns the frequency-converted test signal to the wireless receiving test device. At this time, the power of the transmitting signal is gradually increased, and the power of the test signal is also gradually increased. If the power of the transmitting signal increases to the power threshold of the passive wireless temperature sensor, the frequency-converted test signal is self-locked, and the power of the test signal no longer changes with the change of the input signal power, it means that the passive wireless temperature sensor is working normally; otherwise, it means that the passive wireless temperature sensor is not working properly.

2. The method for testing an adaptive wireless passive temperature sensor according to claim 1, characterized in that: The specific steps are: Step 1: Set the transmission frequency of the wireless transmitter to f pump The transmitting signal is set to a low power state. Step 2: Place the passive wireless temperature sensor in a location that can receive the frequency f emitted by the transmitter. pump within the scope of Step 3: The intact passive wireless temperature sensor receives f pump After the signal is received, it will generate a frequency f to be measured. r At this time, the wireless receiving test equipment will r Signal retraction display; Step 4: Gradually increase the f emitted by the wireless transmitter pump The signal power is measured on the wireless receiving test equipment. r How the signal changes; Step 5: By observing f r The signal changes are judged by f pump As the signal power increases, if the wireless receiving test equipment detects a stable fixed frequency that does not change with the increase in power, it means that the sensor is working properly; otherwise, it means that the passive wireless temperature sensor is not working properly.

3. The method for testing an adaptive wireless passive temperature sensor according to claim 2, characterized in that: The wireless transmitting device includes a signal source, a transmitting front end and an antenna. Its function is to provide a transmitting signal for receiving wireless signals from the passive wireless temperature sensor to be tested. The frequency provided by the device is f pump The microwave signal can change f pump output power.

4. The method for testing an adaptive wireless passive temperature sensor according to claim 2, characterized in that: The wireless receiving test equipment includes a spectrum analyzer, a receiving front end and an antenna. Its function is to receive the frequency-converted signal f returned by the sensor. r , which can display the received signal to be tested f r changes.

5. The method for testing an adaptive wireless passive temperature sensor according to claim 2, characterized in that: After obtaining a fixed frequency output by increasing the transmission signal power, the frequency, signal power, transmission efficiency and output efficiency of the signal are obtained according to the output frequency.

6. The method for testing an adaptive wireless passive temperature sensor according to claim 1 or 2, characterized in that: If the wireless receiving test device cannot receive the signal to be tested while the power of the transmitted signal increases, it means that the passive wireless temperature sensor is not working properly.

7. The method for testing an adaptive wireless passive temperature sensor according to claim 1 or 2, characterized in that: If the frequency of the signal to be tested received by the wireless receiving test device is disordered during the process of increasing the power of the transmitted signal, it means that the passive wireless temperature sensor is not working properly.

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