Temperature measurement method, product and wireless passive temperature sensor

Abstract

The application discloses a temperature measurement method, product and wireless passive temperature sensor, relates to the technical field of sensing and measurement, and the temperature measurement method comprises the following steps: receiving a radio frequency carrier signal transmitted by an RFID reader to locally supply power, receiving a modulation command signal to determine a temperature measurement request, wherein the modulation command signal is obtained by modulating the radio frequency carrier signal by the RFID reader, performing temperature measurement on a to-be-measured object based on the temperature measurement request to obtain temperature data, and transmitting the encoded temperature data to the RFID reader for decoding the encoded temperature data by the RFID reader to obtain the temperature data. In the application, the RFID temperature sensor is wirelessly connected with the RFID reader, and wireless power supply is performed based on the radio frequency carrier signal, so that wired connection is not needed, and the temperature sensor can not be affected by the environment to perform temperature measurement, so that the application range of temperature measurement is improved while the measurement precision is ensured.

Description

Technical Field

[0001] This application relates to the field of sensing and measurement technology, and in particular to temperature measurement methods, products and wireless passive temperature sensors. Background Technology

[0002] In industrial production, temperature is a core parameter that affects equipment performance, product quality and safety. In order to ensure measurement accuracy, temperature sensors are usually needed to monitor the temperature of the workpiece in real time.

[0003] Currently, there are two main types of temperature measurement sensors: contact and non-contact. Contact temperature sensors require a wired connection and direct connection to a power source in the field, limiting their application in industrial settings. Non-contact temperature sensors can only measure the surface temperature of materials and are easily affected by material surface characteristics and the environment, resulting in lower measurement accuracy. Therefore, using current temperature sensors makes it difficult to improve application range while maintaining measurement accuracy. Summary of the Invention

[0004] The main purpose of this application is to provide a temperature measurement method, product, and wireless passive temperature sensor, aiming to solve the technical problem that temperature measurement is difficult to simultaneously guarantee application range and measurement accuracy.

[0005] To achieve the above objectives, this application proposes a temperature measurement method applied to a contact-type RFID temperature sensor in a wireless passive temperature sensor. The temperature measurement device further includes an RFID reader / writer, which is wirelessly connected to a local device. The method includes:

[0006] Receives radio frequency carrier signals sent by RFID readers and provides local power based on the radio frequency carrier signals; The system receives a modulation command signal sent by the RFID reader and determines a temperature measurement request based on the modulation command signal, wherein the modulation command signal is obtained by the RFID reader modulating the radio frequency carrier signal; Based on the temperature measurement request, the temperature of the object to be measured is measured to obtain the temperature data of the object to be measured. The temperature data is encoded and sent to the RFID reader so that the RFID reader can decode the encoded temperature data to obtain the temperature data.

[0007] In one embodiment, the step of encoding the temperature data and sending it to the RFID reader includes: Based on a preset protocol format, the temperature data is encoded to obtain encoded temperature data; Adjust the input impedance of the local radio frequency antenna to perform backscatter modulation on the radio frequency carrier signal to obtain the reflected radio frequency signal; Based on the reflected radio frequency signal, the coded temperature data is sent to the RFID reader.

[0008] In one embodiment, the step of measuring the temperature of the object to be measured based on the temperature measurement request to obtain the temperature data of the object to be measured includes: Based on the temperature measurement request, the temperature of the object to be measured is measured to obtain the analog electrical signal corresponding to the temperature of the object to be measured. The analog electrical signal is digitized to obtain the digitized temperature data.

[0009] In one embodiment, the step of powering itself based on the radio frequency carrier signal includes: Based on the local radio frequency antenna, the radio frequency carrier signal is transmitted to the local RFID chip; Based on the RFID chip, the radio frequency carrier signal is converted into DC power, and the DC power is rectified and regulated to obtain working power. The operating electrical energy is supplied locally.

[0010] To achieve the above objectives, this application also proposes a temperature measurement method applied to an RFID reader / writer in a wireless passive temperature sensor. The temperature measurement device further includes a contact-type RFID temperature sensor, which is wirelessly connected to a local device. The method comprises: In response to a command to transmit a radio frequency carrier signal, the radio frequency carrier signal is transmitted to the RFID temperature sensor so that the RFID temperature sensor can power itself based on the radio frequency carrier signal. The radio frequency carrier signal is modulated to obtain a modulation command signal, and the modulation command signal is sent to the RFID temperature sensor so that the RFID temperature sensor can determine a temperature measurement request based on the modulation command signal, and perform temperature measurement on the object to be measured based on the temperature measurement request to obtain the temperature data of the object to be measured. The system receives encoded temperature data sent by the RFID temperature sensor and decodes the encoded temperature data to obtain the temperature data.

[0011] In one embodiment, the step of modulating the radio frequency carrier signal to obtain a modulation command signal and sending the modulation command signal to the RFID temperature sensor includes: The amplitude or phase of the radio frequency carrier signal is modulated to obtain the modulation command signal; The modulation command signal is sent to the radio frequency antenna of the RFID temperature sensor, so that the radio frequency antenna can send the modulation command signal to the RFID chip of the RFID temperature sensor.

[0012] Furthermore, to achieve the above objectives, this application also proposes a wireless passive temperature sensor, which includes: An RFID reader is used to respond to a transmission command of a radio frequency carrier signal, send the radio frequency carrier signal to an RFID temperature sensor, modulate the radio frequency carrier signal to obtain a modulation command signal, send the modulation command signal to the RFID temperature sensor, receive the encoded temperature data sent by the RFID temperature sensor, and decode the encoded temperature data to obtain the temperature data. An RFID temperature sensor is used to receive radio frequency carrier signals sent by an RFID reader, to be locally powered based on the radio frequency carrier signals, to receive modulation command signals sent by the RFID reader, to determine a temperature measurement request based on the modulation command signals, to measure the temperature of the object to be measured based on the temperature measurement request, to obtain the temperature data of the object to be measured, and to encode the temperature data and send it to the RFID reader.

[0013] In one possible embodiment of this application, the wireless passive temperature sensor further includes: The radio frequency antenna is used to receive the radio frequency carrier signal sent by the RFID reader, transmit the radio frequency carrier signal and the modulation command signal to the local RFID chip, and send the locally generated reflected radio frequency signal to the RFID reader. The RFID chip is used to convert the radio frequency carrier signal into DC power, rectify and regulate the DC power to obtain working power, determine the temperature measurement request based on the modulation command signal, digitize the analog electrical signal measured by the local temperature sensing unit to obtain the digitized temperature data, and encode the temperature data according to a preset protocol format to obtain coded temperature data. A temperature sensing unit is used to measure the temperature of the object to be measured based on the temperature measurement request, obtain an analog electrical signal corresponding to the temperature of the object to be measured, and send the analog electrical signal to the RFID chip.

[0014] In one possible implementation of this application, the radio frequency antenna and the RFID chip are integrated into an integrated module, and the temperature sensing unit is independent of the integrated module and is connected to the integrated module based on a flexible PCB board or cable of a preset length.

[0015] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the temperature measurement method described above.

[0016] One or more technical solutions proposed in this application have at least the following technical effects: This application receives a radio frequency carrier signal sent by an RFID reader / writer, uses the radio frequency carrier signal as local power, receives a modulation command signal sent by the RFID reader / writer, determines a temperature measurement request based on the modulation command signal, wherein the modulation command signal is obtained by the RFID reader / writer modulating the radio frequency carrier signal, performs temperature measurement on the object to be measured based on the temperature measurement request, obtains the temperature data of the object to be measured, encodes the temperature data and sends it to the RFID reader / writer for the RFID reader / writer to decode the encoded temperature data to obtain the temperature data.

[0017] To address the limitations of current contact-type temperature sensors and the low accuracy of non-contact temperature sensors, which hinder the simultaneous improvement of application range and measurement accuracy, this application utilizes a wireless, passive RFID temperature sensor to simultaneously guarantee both application range and measurement accuracy. Specifically, the RFID temperature sensor in this application is wirelessly connected to an RFID reader, and is wirelessly powered by the radio frequency carrier signal transmitted by the RFID reader, eliminating the need for wired connections and thus ensuring a wider application range for temperature measurement. Furthermore, this RFID temperature sensor is a contact-type sensor, capable of measuring the internal temperature of the object being measured and unaffected by various environmental factors, thereby improving measurement accuracy. Therefore, overall, this application can improve the application range of temperature measurement while maintaining measurement accuracy. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating an embodiment of the temperature measurement method of this application. Figure 2This is a schematic diagram of the first scenario provided in Embodiment 2 of the temperature measurement method of this application; Figure 3 This is a schematic diagram of the second scenario provided in Embodiment 2 of the temperature measurement method of this application; Figure 4 This is a schematic diagram of the third scenario provided in Embodiment 2 of the temperature measurement method of this application; Figure 5 This is a flowchart illustrating Embodiment 2 of the temperature measurement method of this application; Figure 6 This is a schematic diagram illustrating the data acquisition consent process involved in the temperature measurement method described in this application.

[0021] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0023] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0024] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or temperature measuring device capable of performing the above functions. The following description uses a temperature measuring device as an example to illustrate this embodiment and the subsequent embodiments.

[0025] In industrial production, temperature is a core parameter that affects equipment performance, product quality and safety. In order to ensure measurement accuracy, temperature sensors are usually needed to monitor the temperature of the workpiece in real time.

[0026] Currently, there are two main types of temperature measurement sensors: contact and non-contact. Contact temperature sensors typically require the use of instruments for signal measurement and display. This type of temperature measurement relies on wired connections and direct power supply in the field. Although it offers high measurement accuracy and stable response, it has certain limitations in industrial settings. For example, wiring is complex and maintenance costs are high; in confined spaces or environments with high temperatures, high pressures, or strong electromagnetic interference, wiring is difficult and its reliability is limited. Furthermore, some industrial scenarios (such as explosion-proof areas in oil and gas or chemical industries) have strict safety certification requirements for electrical equipment, and traditional wired active temperature measurement systems often fail to meet explosion-proof standards, thus limiting their application scope.

[0027] Non-contact temperature measurement devices rely on the infrared radiation characteristics of the object being measured to estimate its surface temperature, offering advantages such as fast response and wide applicability. However, this type of temperature measurement also has certain limitations. First, the measurement results are highly sensitive to the emissivity of the measured surface; different materials, surface roughness, or oxidation levels can all cause changes in radiation characteristics, introducing significant errors. Second, infrared thermometry cannot directly reflect the internal temperature of a material, only providing surface temperature information. Third, environmental factors (such as smoke, steam, dust, and even air humidity) can interfere with the propagation of infrared radiation, affecting measurement stability. Furthermore, in high-temperature, strong-light, or multi-reflection environments, infrared detectors may be affected by background radiation interference, requiring additional optical filtering or signal compensation processing.

[0028] Therefore, using current temperature sensors makes it difficult to improve the range of applications while ensuring measurement accuracy.

[0029] Based on this, this application provides a temperature measurement method applied to a contact-type RFID temperature sensor in a temperature measurement device. The temperature measurement device further includes an RFID reader / writer, which is wirelessly connected to a local network. (Refer to...) Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the temperature measurement method of this application.

[0030] In this embodiment, the temperature measurement method includes steps S10 to S40: Step S10: Receive the radio frequency carrier signal sent by the RFID reader and provide local power based on the radio frequency carrier signal; It should be noted that RFID (Radio Frequency Identification) readers are devices used to communicate with RFID tags. They are capable of emitting radio frequency carrier signals to activate passive RFID tags and receiving response signals returned by the tags. Radio frequency carrier signals refer to high-frequency electromagnetic wave signals emitted by RFID readers, used to transmit energy and information in space.

[0031] It should also be noted that the RFID temperature sensor in this embodiment includes: The radio frequency antenna (101) is used to receive radio frequency signals from the RFID reader (200) and send the internally generated backscattered signals back to the RFID reader; The RFID chip (102) is used to rectify, regulate and demodulate the received signal to realize energy management, command parsing, temperature data processing and storage; The temperature sensing unit (103) is used to sense the temperature of the environment or the object being measured and convert the temperature information into an electrical signal that can be read by the RFID chip.

[0032] In this embodiment, the connection relationship between the RFID reader and the RFID temperature sensor, as well as the integration relationship of the various components in the RFID temperature sensor, are as follows: Figure 2 As shown.

[0033] It is understood that this embodiment uses the radio frequency carrier signal sent by the RFID reader as an energy source and uses an energy harvesting mechanism to power the local circuit, thereby avoiding the use of built-in batteries or external power sources. This not only reduces the size, cost and maintenance complexity of the device, but also improves its deployment flexibility and long-term reliability in passive application scenarios, because the device can continuously obtain working energy as long as it is within the range of the RFID reader.

[0034] In one feasible implementation, the specific implementation method of powering itself based on the radio frequency carrier signal can also be: Based on the local radio frequency antenna, the radio frequency carrier signal is transmitted to the local RFID chip. Based on the RFID chip, the radio frequency carrier signal is converted into DC power, and the DC power is rectified and regulated to obtain working power, which is used to supply power locally.

[0035] It should be noted that the radio frequency antenna refers to a device used to receive or transmit radio frequency signals. In this embodiment, it is used to receive radio frequency carrier signals from the RFID reader and transmit them to the local circuit. The RFID chip refers to the core integrated circuit integrated into the RFID tag, possessing functions such as energy harvesting, signal demodulation, data processing, and response. It can convert the received radio frequency signals into electrical energy and execute commands. Rectification refers to the process of converting AC radio frequency signals into unidirectional pulsating DC power. Voltage regulation refers to the process of adjusting the voltage of the rectified DC power to make its output stable and suitable for the operating requirements of subsequent circuits. Working power refers to the stable DC power obtained after rectification and voltage regulation, which can be used to drive the normal operation of the local circuit.

[0036] It is understood that in this embodiment, the radio frequency carrier signal is received by a local radio frequency antenna and transmitted to the local RFID chip. The RFID chip uses its internal energy harvesting module to convert the radio frequency carrier signal into DC power, and then performs rectification and voltage regulation on the DC power to generate stable operating power to supply the various functional modules, thereby achieving efficient and stable passive power supply and ensuring the reliable execution of subsequent sensing and communication operations.

[0037] Step S20: Receive the modulation command signal sent by the RFID reader, and determine the temperature measurement request based on the modulation command signal, wherein the modulation command signal is obtained by the RFID reader modulating the radio frequency carrier signal; It should be noted that the modulation command signal refers to the signal containing specific instruction information formed by the RFID reader modulating the radio frequency carrier signal through modulation methods such as ASK (Amplitude Shift Keying) and PSK (Phase Shift Keying), which is used to transmit control commands or requests to the RFID tag.

[0038] It is understood that the device in this embodiment receives a modulated command signal sent by an RFID reader, which is formed by superimposing instruction information on the original radio frequency carrier signal. The device demodulates the modulated command signal to extract the specific command content and determines whether a temperature measurement request exists, thereby responding to external commands and activating specific functions as needed under passive conditions.

[0039] Since the modulation command signal is generated by modulating an existing radio frequency carrier signal, the device can use the carrier to power itself while also reusing the same signal channel to receive control commands without the need for additional communication links or energy overhead. This allows for accurate identification and response to temperature measurement requests without increasing hardware complexity.

[0040] Step S30: Based on the temperature measurement request, perform temperature measurement on the object to be measured to obtain the temperature data of the object to be measured; It should be noted that a temperature measurement request refers to an instruction sent by an RFID reader via a modulated command signal and identified by the device to trigger temperature sensing operations. The object to be measured refers to the target object for which temperature detection is required, and its temperature information is the data to be acquired in this embodiment. Temperature data refers to the electrical signal or digital value obtained through temperature measurement operations that characterizes the current temperature state of the object to be measured.

[0041] In one feasible implementation, the specific implementation of measuring the temperature of the object to be measured based on the temperature measurement request to obtain the temperature data of the object to be measured can also be: Based on the temperature measurement request, the temperature of the object to be measured is measured to obtain the analog electrical signal corresponding to the temperature of the object to be measured. The analog electrical signal is then digitized to obtain the digitized temperature data.

[0042] It should be noted that analog electrical signals refer to continuously varying voltage or current signals output by temperature sensors, the amplitude of which corresponds to the temperature of the object being measured. Digitization refers to the process of converting continuous analog electrical signals into discrete digital signals using an analog-to-digital converter (ADC) to facilitate subsequent processing, storage, or transmission.

[0043] It should also be noted that the RFID temperature sensor in this embodiment can also store a serial number. The software can be used to customize metadata such as the installation location corresponding to the serial number of each RFID temperature sensor. Simultaneously, the obtained temperature data can be correlated with ultrasonic thickness measurement signals obtained at adjacent locations, and a temperature compensation algorithm can be used to calculate more accurate wall thickness data.

[0044] Ultrasonic thickness sensors require the sound velocity of the material to calculate thickness, and the sound velocity is related to the material's temperature. When the temperature of the object being measured changes, the measured wall thickness will also change. Therefore, this embodiment can use an RFID temperature sensor to obtain the material's temperature information to compensate for the wall thickness.

[0045] Understandably, in this embodiment, upon receiving a temperature measurement request, the temperature sensor first senses the object to be measured and outputs an analog electrical signal corresponding to its temperature. This analog electrical signal is then digitized using a locally integrated analog-to-digital converter to generate temperature data in digital form. This achieves the accurate and reliable conversion of physical temperature into digital information that can be processed and transmitted back by the RFID system.

[0046] This embodiment digitizes the analog electrical signal output by the temperature sensor, giving the obtained temperature data a clear numerical format and anti-interference capability, facilitating subsequent encoding, storage, or modulation and transmission within the RFID chip. Furthermore, the digitization process in this embodiment is performed by a low-power ADC, enabling efficient operation with limited power consumption. This ensures measurement accuracy while improving the overall data processing efficiency and communication compatibility of the system.

[0047] Step S40: The temperature data is encoded and sent to the RFID reader so that the RFID reader can decode the encoded temperature data to obtain the temperature data.

[0048] It should be noted that encoding refers to the process of converting temperature data into a signal format suitable for transmission over a radio frequency link according to a specific communication protocol or modulation format, including data packaging, verification, modulation, and other operations. Decoding refers to the process by which an RFID reader reverse-processes the received encoded signal to reconstruct the original temperature data.

[0049] It should also be noted that signal transmission between the RFID reader and the RFID temperature sensor may be limited in special scenarios, such as when the structural surface is covered by a metal insulation layer. Therefore, in this embodiment, the temperature sensing unit is separated from the original integrated module and extended via a flexible PCB (Printed Circuit Board). That is, the temperature sensing unit is mounted on the surface of the structure being measured, and the RF antenna and RFID chip are mounted outside the barrier (such as an insulation layer, covering layer, etc.), with the inside and outside of the barrier connected by the flexible PCB. This enables the reading of temperature data beneath the layer. The connection between the RFID chip and the temperature sensing unit via the PCB in this embodiment can be found in [reference needed]. Figure 3 Temperature detection via an extended temperature sensing unit can be referenced. Figure 4 .

[0050] It is understood that this embodiment uses an encoding mechanism to convert temperature data into standardized communication signals and uses backscattering to transmit them back to the RFID reader, thereby ensuring the integrity and identifiability of the data during wireless transmission.

[0051] In one feasible implementation, the specific method of encoding the temperature data and sending it to the RFID reader can also be: Based on a preset protocol format, the temperature data is encoded to obtain encoded temperature data. The input impedance of the local radio frequency antenna is adjusted, and the radio frequency carrier signal is backscattered and modulated to obtain a reflected radio frequency signal. Based on the reflected radio frequency signal, the encoded temperature data is sent to the RFID reader.

[0052] It should be noted that the preset protocol format is a pre-agreed data organization rule, including data frame structure, start / end markers, and verification methods, used to ensure that the encoded temperature data can be correctly identified and parsed by the RFID reader. Encoded temperature data refers to the data format that can be used for wireless transmission, obtained after encapsulating and modulating the raw temperature data according to the preset protocol format. Input impedance refers to the equivalent impedance presented to the RFID chip circuit by the RF antenna port; its variation affects the antenna's reflection characteristics of the incident RF signal. Backscatter modulation refers to dynamically changing the input impedance of the RF antenna to reflect the incident RF carrier signal to different degrees, thereby embedding information in the reflected signal. The reflected RF signal refers to the modulated RF signal carrying the encoded temperature data, reflected back into space via the local RF antenna.

[0053] Understandably, in this embodiment, temperature data is encoded based on a preset protocol format to generate coded temperature data. The RFID chip is then controlled to adjust the input impedance of its local radio frequency antenna. This impedance change is used to perform backscatter modulation on the radio frequency carrier signal from the RFID reader, generating a reflected radio frequency signal carrying the coded temperature data. This reflected radio frequency signal propagates through space and is received by the RFID reader, completing the wireless transmission of temperature data. Thus, under passive conditions, the sensor data is transmitted back to the reader efficiently and with low power consumption using only a passive reflection mechanism.

[0054] This embodiment achieves backscatter modulation of the radio frequency carrier signal by adjusting the input impedance of the radio frequency antenna. It can load the coded temperature data into the reflected signal without the need for an active radio frequency transmitting circuit, thereby significantly reducing system power consumption and hardware complexity. While ensuring communication reliability, it makes full use of the existing RFID backscatter communication mechanism to achieve high-efficiency and low-cost wireless temperature data backhaul.

[0055] In one embodiment, the implementation following the step of measuring the temperature of the object to be measured based on the temperature measurement request to obtain the temperature data of the object to be measured can also be: The system detects whether the voltage of the local operating power supply has reached the preset encoding threshold. If it has, the system performs subsequent encoding and transmission operations. If it has not, the system temporarily stores the temperature data and waits for the next radio frequency carrier signal to arrive before re-evaluating whether the encoding threshold is met.

[0056] It should be noted that the preset encoding threshold refers to the minimum operating voltage value set to ensure the reliable operation of the encoding circuit. If the voltage is lower than this value, the analog-to-digital converter or digital logic may produce erroneous outputs. Temporary storage refers to temporarily storing acquired but not yet transmitted temperature data in the non-volatile or low-power volatile memory unit inside the RFID chip, waiting for subsequent processing when sufficient power is available.

[0057] It is understood that after obtaining temperature data through temperature measurement, the RFID temperature sensor in this embodiment does not immediately encode and transmit the data. Instead, it first checks whether the voltage level of the operating power converted from the radio frequency carrier signal reaches a preset encoding threshold. If the voltage is sufficient, encoding and backscatter transmission continue. If the voltage is insufficient, the temperature data is temporarily stored in the local storage unit and enters a low-power waiting state until the next radio frequency carrier signal is received, at which point the energy conditions are reassessed. This allows for the judgment of critical data transmission operations in a highly energy-constrained passive environment, preventing communication failures or data corruption due to insufficient power supply.

[0058] Since the RFID temperature sensor in this embodiment scenario completely relies on instantaneous radio frequency power supply, its operating power is significantly affected by distance, environment, and fluctuations in the reader power. If forced encoding and backhaul are performed when the voltage is insufficient, it is extremely easy to cause data errors or communication interruptions. Therefore, this embodiment introduces an energy threshold judgment and data caching mechanism, and only performs high-power encoding operations when the energy is sufficient, thereby significantly improving the success rate and integrity of data backhaul.

[0059] In one embodiment, after caching the temperature data, if the radio frequency carrier signal is received continuously for N times but the operating power does not reach the preset encoding threshold each time, the temperature data is marked as low priority, and when the encoding threshold is first met subsequently, only the compressed summary of the low-priority data is backhauled instead of the complete temperature data; if the backhaul is still not completed when the signal is received for the Mth time (M > N), the temperature data is discarded and the cache record is cleared.

[0060] It should be noted that low priority refers to the status flag of temperature data that has been degraded due to the failure to successfully backhaul for a long time. The compressed summary refers to a simplified representation of the original temperature data (such as only retaining the integer part, or using differential encoding, or truncating the lower bits) to reduce the energy consumption required for encoding and backscattering. N times / M times are respectively the preset retry threshold and timeout discard threshold, N < M, and both are positive integers, which are configured by the system according to the reliability requirements of the application scenario.

[0061] It can be understood that after caching the temperature data, the RFID temperature sensor in this embodiment continuously counts the number of subsequent received radio frequency carrier signals; if the encoding and backhaul cannot be performed continuously for N times due to insufficient operating power, the data is marked as low priority, and once the energy condition is met thereafter, only its compressed summary is backhauled instead of the complete data to save precious power. If the backhaul still cannot be completed until the Mth interaction (even the summary has not been sent), the stale data is actively discarded and the storage resources are released. Thus, intelligent data storage and data transmission are realized in an extremely weak power supply environment, avoiding the long-term occupation of limited cache by invalid data.

[0062] Since the RFID temperature sensor in this application can be deployed in a closed / embedded environment that is difficult to replace or maintain, where its storage unit is extremely small and energy acquisition is highly uncertain, if old data remains for a long time, it will not only waste storage space but may also block new measurement tasks. Therefore, this embodiment dynamically performs data storage and transmission based on the number of retries, and can still transmit the status information at the minimum cost under extremely limited energy conditions, which has more engineering value than no backhaul at all, thus ensuring the long-term operation stability of the system.

[0063] In summary, this embodiment receives a radio frequency carrier signal sent by an RFID reader / writer, uses the radio frequency carrier signal for local power supply, receives a modulation command signal sent by the RFID reader / writer, determines a temperature measurement request based on the modulation command signal, wherein the modulation command signal is obtained by the RFID reader / writer modulating the radio frequency carrier signal, and performs temperature measurement on the object to be measured based on the temperature measurement request to obtain the temperature data of the object to be measured. The temperature data is then encoded and sent to the RFID reader / writer for the RFID reader / writer to decode the encoded temperature data to obtain the temperature data.

[0064] To address the limitations of current contact-type temperature sensors and the low accuracy of non-contact temperature sensors, which hinder the simultaneous improvement of application range and measurement accuracy, this embodiment utilizes a wireless, passive RFID temperature sensor to simultaneously guarantee both application range and measurement accuracy. Specifically, in this embodiment, the RFID temperature sensor is wirelessly connected to an RFID reader, and the sensor is wirelessly powered by the radio frequency carrier signal transmitted by the RFID reader, eliminating the need for wired connections and thus ensuring a wider application range for temperature measurement. Furthermore, this embodiment's RFID temperature sensor is a contact-type sensor, capable of measuring the internal temperature of the object being measured and unaffected by various environmental factors, thereby improving measurement accuracy. Therefore, overall, this embodiment effectively expands the application range of temperature measurement while maintaining measurement accuracy.

[0065] This application also provides a temperature measurement method applied to an RFID reader / writer in a temperature measurement device. The temperature measurement device further includes a contact-type RFID temperature sensor, which is wirelessly connected to a local source. (Refer to...) Figure 5 , Figure 5 This is a flowchart illustrating the second embodiment of the temperature measurement method of this application.

[0066] In this embodiment, the temperature measurement method includes steps A10 to A30: Step A10: In response to the radio frequency carrier signal transmission command, the radio frequency carrier signal is transmitted to the RFID temperature sensor so that the RFID temperature sensor can power itself based on the radio frequency carrier signal. It should be noted that an RFID reader refers to an active terminal device that has the ability to transmit radio frequency carrier signals, send modulation commands, and receive reflected signals, and is used to drive and communicate with RFID temperature sensors.

[0067] A contact-type RFID temperature sensor refers to a passive RFID tag that integrates a temperature sensing unit and requires physical contact with the object being measured to obtain its temperature. This sensor is powered by receiving radio frequency carrier signals and communicates with the RFID reader via backscattering. A local wireless connection refers to a non-contact, short-range wireless communication link established between the RFID reader and the RFID temperature sensor via a radio frequency electromagnetic field, used for power transfer and data exchange. The radio frequency carrier signal transmission command refers to the operational command generated by the RFID reader's internal controller to trigger the transmission of the radio frequency carrier signal.

[0068] It is understood that the RFID reader in this embodiment actively sends radio frequency carrier signals to provide the necessary operating power source for the passive RFID temperature sensor, so that the sensor can be activated and operated without a built-in battery, thereby simplifying the structure and maintenance cost of the sensor, and ensuring that power is only provided when measurement is needed, avoiding the waste of resources caused by continuous power supply.

[0069] Step A20: Modulate the radio frequency carrier signal to obtain a modulation command signal, and send the modulation command signal to the RFID temperature sensor so that the RFID temperature sensor can determine a temperature measurement request based on the modulation command signal, and perform temperature measurement on the object to be measured based on the temperature measurement request to obtain the temperature data of the object to be measured. It should be noted that in this embodiment, modulation refers to the process by which the RFID reader superimposes control command information onto the transmitted radio frequency carrier signal by changing its amplitude, phase, or frequency, thereby forming a modulated command signal containing specific commands.

[0070] It is understood that this embodiment efficiently transmits temperature measurement requests wirelessly to the RFID temperature sensor by superimposing a modulated command signal onto the radio frequency carrier signal, completing the command issuance without the need for additional communication channels or complex protocols. Furthermore, the modulation process in this embodiment reuses the radio frequency carrier signal already used for power supply, achieving integration of power transmission and command communication. This enables the passive sensor to recognize and respond to external commands without increasing hardware overhead and power consumption, thus improving the flexibility of the entire temperature measurement system.

[0071] In one feasible implementation, the specific embodiment of modulating the radio frequency carrier signal to obtain a modulation command signal and sending the modulation command signal to the RFID temperature sensor can also be: The amplitude or phase of the radio frequency carrier signal is modulated to obtain the modulation command signal, and the modulation command signal is sent to the radio frequency antenna of the RFID temperature sensor so that the radio frequency antenna can send the modulation command signal to the RFID chip of the RFID temperature sensor.

[0072] It should be noted that amplitude modulation refers to a modulation method that carries information by changing the amplitude of the radio frequency carrier signal, while phase modulation refers to a modulation method that encodes information by changing the phase of the radio frequency carrier signal. A modulation command signal refers to a radio frequency signal containing control commands such as temperature measurement requests, after being modulated by amplitude or phase modulation.

[0073] It is understood that the RFID reader in this embodiment modulates the amplitude or phase of the radio frequency carrier signal to generate a modulated command signal containing a temperature measurement request, and sends this signal to the radio frequency antenna of the RFID temperature sensor. After receiving the modulated command signal, the radio frequency antenna transmits it to the RFID chip inside the RFID temperature sensor. The chip performs demodulation and command parsing, and reliably transmits the control command using the standard RFID downlink modulation mechanism, ensuring that the passive sensor can accurately identify the measurement trigger signal.

[0074] This embodiment completes command transmission by reusing the existing radio frequency power link, without the need for additional hardware or frequency bands, thereby improving communication reliability and making the issuance of temperature measurement requests more efficient and stable.

[0075] Step A30: Receive the encoded temperature data sent by the RFID temperature sensor, and decode the encoded temperature data to obtain the temperature data.

[0076] It should be noted that the encoded temperature data refers to the data format generated by the RFID temperature sensor after completing temperature measurement, which is encapsulated and modulated according to a preset protocol format and is used for wireless transmission. Decoding in this embodiment refers to the process by which the RFID reader parses and restores the encoded temperature data carried in the received reflected radio frequency signal according to the same protocol to recover the original temperature data.

[0077] It is understood that the RFID reader in this embodiment decodes the received coded temperature data based on a preset protocol, and can accurately identify and restore the temperature information returned by the sensor, thereby ensuring the integrity and semantic consistency of data transmission.

[0078] Furthermore, the decoding process in this embodiment is strictly matched with the encoding mechanism at the sensor end, enabling the decoding success rate to be improved even in environments with weak signals or interference through the verification or synchronization mechanisms in the protocol. Therefore, in passive systems that rely solely on passive backscatter communication, this embodiment can effectively achieve highly reliable and low-overhead temperature data recovery, enhancing the robustness of the entire temperature measurement system.

[0079] In one embodiment, the specific implementation following the modulation of the radio frequency carrier signal to obtain a modulation command signal and the transmission of the modulation command signal to the RFID temperature sensor can also be: After sending the modulation command signal, the transmission power of the radio frequency carrier signal is dynamically adjusted, and the change in the intensity of the reflected signal is monitored. If no valid temperature data is received within a preset time, the transmission power of the radio frequency carrier signal is adaptively increased based on the feedback of the reflected signal intensity to enhance the power supply capability of the RFID temperature sensor.

[0080] It should be noted that transmit power refers to the energy intensity of the radio frequency carrier signal output by the RFID reader, which directly affects the power supply distance and stability for passive tags. Reflected signal strength refers to the amplitude of the signal returned by the RFID temperature sensor through backscattering at the reader's receiving end, which can indirectly reflect whether the sensor is activated and the quality of the communication link. Adaptive boost refers to the reader automatically increasing its output power based on real-time communication feedback, without manual intervention.

[0081] It is understood that after the RFID reader in this embodiment sends a modulation command signal to start temperature measurement, it simultaneously monitors the intensity of the reflected signal from the RFID temperature sensor. If valid temperature data is not successfully decoded within a preset time window and the intensity of the reflected signal is lower than expected, it is determined that the current power supply is insufficient or the communication link is faulty. Then, in the next round of interaction, it adaptively increases the transmission power of the radio frequency carrier signal to enhance the energy supply to the sensor, thereby improving the stability of temperature data acquisition.

[0082] Since the RFID temperature sensor in this application is a contact-mounted sensor, its location may be at the edge of the reader's field strength. Conventional fixed-power transmission can easily lead to insufficient power supply, making it impossible to complete the measurement and transmission. Therefore, this embodiment combines reflected signal strength feedback with dynamic adjustment of transmission power. When the first attempt fails, the system can intelligently enhance the power supply instead of simply retrying, thereby significantly improving the success rate of a single interaction, reducing the number of communication rounds and overall energy consumption, and ensuring that the contact temperature measurement task can still be reliably executed in complex electromagnetic environments, thus improving the stability of temperature data acquisition.

[0083] In summary, the RFID reader in this embodiment responds to a transmission command by radiating a radio frequency carrier signal into space, providing the necessary energy for the contact-type passive RFID temperature sensor. The reader modulates the amplitude or phase of this radio frequency carrier signal to generate a modulated command signal containing a temperature measurement request, and sends it to the RFID temperature sensor's radio frequency antenna. The antenna then transmits the signal to the internal RFID chip to trigger temperature measurement. Finally, the reader receives the encoded temperature data returned by the sensor via backscattering, decodes it according to a preset protocol, and reconstructs the original temperature data.

[0084] In this embodiment, the radio frequency carrier signal serves both as an energy carrier to power the passive sensor and as an information carrier to transmit control commands through modulation. This constructs a simple, low-power temperature measurement system without relying on batteries or additional communication modules. Furthermore, by employing standard amplitude or phase modulation methods and a protocol-based encoding / decoding mechanism, this embodiment ensures compatibility in command transmission and reliability in data feedback. This not only reduces system deployment and maintenance costs but also improves the reliability of contact-based temperature sensing in industrial monitoring and other scenarios.

[0085] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the temperature measurement method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0086] This application also proposes a wireless passive temperature sensor, which includes: An RFID reader is used to respond to a transmission command of a radio frequency carrier signal, send the radio frequency carrier signal to an RFID temperature sensor, modulate the radio frequency carrier signal to obtain a modulation command signal, send the modulation command signal to the RFID temperature sensor, receive the encoded temperature data sent by the RFID temperature sensor, and decode the encoded temperature data to obtain the temperature data. An RFID temperature sensor is used to receive radio frequency carrier signals sent by an RFID reader, to be locally powered based on the radio frequency carrier signals, to receive modulation command signals sent by the RFID reader, to determine a temperature measurement request based on the modulation command signals, to measure the temperature of the object to be measured based on the temperature measurement request, to obtain the temperature data of the object to be measured, and to encode the temperature data and send it to the RFID reader.

[0087] The wireless passive temperature sensor further includes: The radio frequency antenna is used to receive the radio frequency carrier signal sent by the RFID reader, transmit the radio frequency carrier signal and the modulation command signal to the local RFID chip, and send the locally generated reflected radio frequency signal to the RFID reader. The RFID chip is used to convert the radio frequency carrier signal into DC power, rectify and regulate the DC power to obtain working power, determine the temperature measurement request based on the modulation command signal, digitize the analog electrical signal measured by the local temperature sensing unit to obtain the digitized temperature data, and encode the temperature data according to a preset protocol format to obtain coded temperature data. A temperature sensing unit is used to measure the temperature of the object to be measured based on the temperature measurement request, obtain an analog electrical signal corresponding to the temperature of the object to be measured, and send the analog electrical signal to the RFID chip.

[0088] The radio frequency antenna and the RFID chip are integrated into an integrated module, and the temperature sensing unit is independent of the integrated module and is connected to the integrated module based on a flexible PCB board or cable of a preset length.

[0089] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the temperature measurement method described above.

[0090] The computer program product provided in this application can solve the technical problem that temperature measurement is difficult to simultaneously guarantee in terms of application range and measurement accuracy. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the temperature measurement method provided in the above embodiments, and will not be repeated here.

[0091] All user-related data involved in this application was obtained with the user's permission or consent, as per [reference]. Figure 6 In other words, when this application is applied to a specific product or technology, user permission is required to acquire and process the relevant data, and the processing of the relevant data must comply with the relevant laws, regulations and regulatory standards of the relevant countries and regions.

[0092] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A temperature measurement method, characterized in that, A contact-type RFID temperature sensor is used in wireless passive temperature sensors. The temperature measuring device further includes an RFID reader / writer, which is wirelessly connected to a local source. The method includes: Receives radio frequency carrier signals sent by RFID readers and provides local power based on the radio frequency carrier signals; The system receives a modulation command signal sent by the RFID reader and determines a temperature measurement request based on the modulation command signal, wherein the modulation command signal is obtained by the RFID reader modulating the radio frequency carrier signal; Based on the temperature measurement request, the temperature of the object to be measured is measured to obtain the temperature data of the object to be measured. The temperature data is encoded and sent to the RFID reader so that the RFID reader can decode the encoded temperature data to obtain the temperature data.

2. The method as described in claim 1, characterized in that, The step of encoding the temperature data and sending it to the RFID reader includes: Based on a preset protocol format, the temperature data is encoded to obtain encoded temperature data; Adjust the input impedance of the local radio frequency antenna to perform backscatter modulation on the radio frequency carrier signal to obtain the reflected radio frequency signal; Based on the reflected radio frequency signal, the coded temperature data is sent to the RFID reader.

3. The method as described in claim 1, characterized in that, The step of measuring the temperature of the object to be measured based on the temperature measurement request to obtain the temperature data of the object to be measured includes: Based on the temperature measurement request, the temperature of the object to be measured is measured to obtain the analog electrical signal corresponding to the temperature of the object to be measured. The analog electrical signal is digitized to obtain the digitized temperature data.

4. The method as described in claim 1, characterized in that, The step of powering itself based on the radio frequency carrier signal includes: Based on the local radio frequency antenna, the radio frequency carrier signal is transmitted to the local RFID chip; Based on the RFID chip, the radio frequency carrier signal is converted into DC power, and the DC power is rectified and regulated to obtain working power. The operating electrical energy is supplied locally.

5. A temperature measurement method, characterized in that, An RFID reader / writer is used in a wireless passive temperature sensor. The temperature measuring device further includes a contact-type RFID temperature sensor, which is wirelessly connected to a local source. The method includes: In response to a command to transmit a radio frequency carrier signal, the radio frequency carrier signal is transmitted to the RFID temperature sensor so that the RFID temperature sensor can power itself based on the radio frequency carrier signal. The radio frequency carrier signal is modulated to obtain a modulation command signal, and the modulation command signal is sent to the RFID temperature sensor so that the RFID temperature sensor can determine a temperature measurement request based on the modulation command signal, and perform temperature measurement on the object to be measured based on the temperature measurement request to obtain the temperature data of the object to be measured. The system receives encoded temperature data sent by the RFID temperature sensor and decodes the encoded temperature data to obtain the temperature data.

6. The method as described in claim 5, characterized in that, The step of modulating the radio frequency carrier signal to obtain a modulation command signal and sending the modulation command signal to the RFID temperature sensor includes: The amplitude or phase of the radio frequency carrier signal is modulated to obtain the modulation command signal; The modulation command signal is sent to the radio frequency antenna of the RFID temperature sensor, so that the radio frequency antenna can send the modulation command signal to the RFID chip of the RFID temperature sensor.

7. A wireless passive temperature sensor, characterized in that, The wireless passive temperature sensor includes: An RFID reader is used to respond to a transmission command of a radio frequency carrier signal, send the radio frequency carrier signal to an RFID temperature sensor, modulate the radio frequency carrier signal to obtain a modulation command signal, send the modulation command signal to the RFID temperature sensor, receive the encoded temperature data sent by the RFID temperature sensor, and decode the encoded temperature data to obtain the temperature data. An RFID temperature sensor is used to receive radio frequency carrier signals sent by an RFID reader, to be locally powered based on the radio frequency carrier signals, to receive modulation command signals sent by the RFID reader, to determine a temperature measurement request based on the modulation command signals, to measure the temperature of the object to be measured based on the temperature measurement request, to obtain the temperature data of the object to be measured, and to encode the temperature data and send it to the RFID reader.

8. The wireless passive temperature sensor as described in claim 7, characterized in that, The wireless passive temperature sensor also includes: The radio frequency antenna is used to receive the radio frequency carrier signal sent by the RFID reader, transmit the radio frequency carrier signal and the modulation command signal to the local RFID chip, and send the locally generated reflected radio frequency signal to the RFID reader. The RFID chip is used to convert the radio frequency carrier signal into DC power, rectify and regulate the DC power to obtain working power, determine the temperature measurement request based on the modulation command signal, digitize the analog electrical signal measured by the local temperature sensing unit to obtain the digitized temperature data, and encode the temperature data according to a preset protocol format to obtain coded temperature data. A temperature sensing unit is used to measure the temperature of the object to be measured based on the temperature measurement request, obtain an analog electrical signal corresponding to the temperature of the object to be measured, and send the analog electrical signal to the RFID chip.

9. The wireless passive temperature sensor as described in claim 8, characterized in that, The radio frequency antenna and the RFID chip are integrated into an integrated module, and the temperature sensing unit is independent of the integrated module and is connected to the integrated module based on a flexible PCB board or cable of a preset length.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the temperature measurement method as described in any one of claims 1 to 6.

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