Thermal imaging device and thermal imaging system

Abstract

The invention provides a thermal imaging device and a thermal imaging system, relates to the field of thermal imaging, and aims to realize high-quality infrared image data transmission by using an antenna. The thermal imaging device comprises an infrared detector module, a radio frequency module, a signal quality monitoring module, a first antenna and a second antenna. The infrared detector module can sense infrared radiation of an object to be detected, generate an electric signal and send the electric signal to the radio frequency module. The signal quality monitoring module is used for detecting the communication quality of the first antenna and the communication quality of the second antenna, and sending a first quality signal reflecting the communication quality of the first antenna and a second quality signal reflecting the communication quality of the second antenna to the radio frequency module. The radio frequency module is capable of generating an infrared image data signal according to the electrical signal. And selecting to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal, wherein the communication quality of the selected antenna is higher than that of the unselected antenna.

Description

Technical Field

[0001] The present invention relates to the field of thermal imaging, and in particular to a thermal imaging device and a thermal imaging system. Background Art

[0002] As an important part of wireless communication equipment, antennas can realize the spatial radiation function of signals and transmit data in the form of electromagnetic waves. Antennas are popular because of their wide coverage, rich spectrum resources, and support for high-speed transmission.

[0003] Thermal imaging equipment uses infrared detectors to obtain thermal imaging data of the scene to be detected, and can send the thermal imaging data to the image processing device through the antenna, which converts the data into infrared images and displays them on the monitor. However, if the antenna is blocked or shielded, the quality of data transmission will be greatly reduced. Summary of the invention

[0004] The embodiments of the present invention provide a thermal imaging device and a thermal imaging system, aiming to realize high-quality infrared image data transmission by using an antenna.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, the present application provides a thermal imaging device, which includes an infrared detector, a radio frequency module, a signal quality monitoring module, a first antenna, and a second antenna. The infrared detector is connected to the radio frequency module, the radio frequency module is connected to the first antenna and the second antenna, and the signal quality monitoring module is connected to the radio frequency module. The infrared detector module is configured to: sense the infrared radiation of the object to be measured, generate an electrical signal, and send the electrical signal to the radio frequency module. The signal quality monitoring module is configured to: detect the communication quality of the first antenna and the communication quality of the second antenna, and send a first quality signal reflecting the communication quality of the first antenna and a second quality signal reflecting the communication quality of the second antenna to the radio frequency module. The radio frequency module is configured to: generate an infrared image data signal according to the electrical signal. Based on the first quality signal and the second quality signal, the infrared image data signal is selected to be sent to the first antenna or the second antenna, wherein the communication quality of the selected antenna is higher than the communication quality of the unselected antenna.

[0007] The infrared detector module in the thermal imaging device provided by the present application can sense the infrared radiation of the object to be measured, and generate an electrical signal after photoelectric conversion. Since the infrared detector module is connected to the radio frequency module, the infrared detector module can send the electrical signal to the radio frequency module. The signal quality monitoring module can detect the communication quality of the first antenna and the communication quality of the second antenna, and send the first quality signal and the second quality signal to the radio frequency module. The first quality signal can reflect the communication quality of the first antenna, and the second quality signal can reflect the communication quality of the second antenna. The communication quality is also the quality of the infrared image data signal transmitted by the antenna (the first antenna and the second antenna). The radio frequency module converts the electrical signal into an infrared image data signal that can be transmitted by the antenna after digital signal processing and modulation, and selects the antenna based on the first quality signal and the second quality signal to transmit the infrared image data signal. When the communication quality of the first antenna is poor, it switches to the second antenna to transmit data, and when the communication quality of the second antenna is poor, it switches to the first antenna to transmit data, so that the infrared image data signal can always be transmitted through the antenna with high quality.

[0008] As a possible implementation manner, the communication quality of the selected antenna is higher than the communication quality of the unselected antenna, including that the signal-to-noise ratio of the unselected antenna is less than a first threshold, and the signal-to-noise ratio of the selected antenna is greater than the signal-to-noise ratio of the unselected antenna.

[0009] As a possible implementation method, based on the first quality signal and the second quality signal, the infrared image data signal is selected to be sent to the first antenna or the second antenna, including when the size of the data packet of the infrared image data signal is greater than a second threshold, based on the first quality signal and the second quality signal, selecting to send the infrared image data signal to the first antenna or the second antenna.

[0010] As a possible implementation method, based on the first quality signal and the second quality signal, the infrared image data signal is selected to be sent to the first antenna or the second antenna, including when the size of the data packet of the infrared image data signal is greater than the second threshold and the difference in the signal-to-noise ratio of the first antenna and the second antenna is greater than the third threshold, based on the first quality signal and the second quality signal, the infrared image data signal is selected to be sent to the first antenna or the second antenna.

[0011] As a possible implementation, the radio frequency module includes a radio frequency circuit, a processing circuit, and a switch circuit. The input end of the radio frequency circuit is connected to the infrared detector module, and the output end of the radio frequency circuit is connected to the first input end of the switch circuit. The first output end of the switch circuit is connected to the first antenna, and the second output end of the switch circuit is connected to the second antenna. The input end of the processing circuit is connected to the signal quality monitoring module, and the output end of the processing circuit is connected to the second input end of the switch circuit. The radio frequency circuit is configured to receive an electrical signal, convert the electrical signal into an infrared image data signal, and transmit the infrared image data signal to the switch circuit. The processing circuit is configured to control the conduction between the first input end and the first output end of the switch circuit according to the first quality signal and the second quality signal, so as to output the infrared image data to the first antenna. Alternatively, the conduction between the first input end and the second output end of the switch circuit is controlled to output the infrared image data to the second antenna.

[0012] As a possible implementation, the switch circuit includes a first RF switch and a second RF switch. The first end of the first RF switch is connected to the first input end of the switch circuit, the second end of the first RF switch is connected to the first output end of the switch circuit, and the control end of the first RF switch is connected to the second input end of the switch circuit. The first end of the second RF switch is connected to the first input end of the switch circuit, the second end of the second RF switch is connected to the second output end of the switch circuit, and the control end of the second RF switch is connected to the second input end of the switch circuit.

[0013] As a possible implementation, the thermal imaging device further includes a circuit board and a packaging shell, wherein the circuit board is disposed inside the packaging shell. The infrared detector module, the radio frequency module, and the signal quality monitoring module are disposed on the circuit board. The first antenna and the second antenna are both connected to the circuit board, and there is a preset distance between the second antenna and the first antenna.

[0014] As a possible implementation, the packaging shell includes a detection part and a handle part that are connected to each other, the infrared detector module and the first antenna are located in a space surrounded by the detection part, and the second antenna is located in a space surrounded by the handle part.

[0015] As a possible implementation, the first antenna is a printed circuit board antenna, which is arranged on the area of ​​the circuit board near the top of the detection part. The second antenna is a flexible printed circuit antenna, at least part of which is connected to the inner wall of the bottom of the handle part.

[0016] In a second aspect, the present application also provides a thermal imaging system. The thermal imaging system includes a host computer and a thermal imaging device as mentioned in the first aspect and its possible implementation. The host computer is connected to the thermal imaging device, and the host computer is configured to: receive an infrared image data signal from the thermal imaging device and output an infrared image of the object to be measured. Among them, the beneficial effects of the second aspect and its specific implementation methods can refer to the beneficial effects of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a thermal imaging device provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the composition of a radio frequency module in a thermal imaging device provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of a switch circuit provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of another switch circuit provided in an embodiment of the present application;

[0021] Figure 5 A structural diagram of another thermal imaging device provided in an embodiment of the present application;

[0022] Figure 6 A schematic diagram of a thermal imaging system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, when describing the pipeline, the "connected" and "connection" used in the present invention have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0026] In the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0027] Antenna transmission is a type of wireless communication technology, which has the advantages of high flexibility, wide coverage, easy expansion, easy maintenance, and high transmission rate. Therefore, it is widely used in many fields. Taking the field of infrared thermal imaging as an example, in complex or dangerous environments, traditional manual detection methods are often not effective, especially in areas with high temperatures, small spaces, or the presence of harmful gases. Manual intervention detection has high safety risks.

[0028] To solve this problem, the technology combining infrared thermal imaging and antennas came into being. Infrared thermal imaging technology can detect infrared radiation on the surface of an object, generate temperature distribution images, and achieve non-contact measurement. In narrow pipelines, deep wells, chemical plants or dangerous areas, a remote-controlled car can be used to carry an infrared thermal imager into areas that are difficult to reach manually for temperature exploration and detection.

[0029] In this process, the data collected by the infrared thermal imager needs to be transmitted to the remote control center in real time for detection and analysis. By integrating the antenna and the infrared thermal imager, the thermal imaging data captured by the infrared thermal imager can be transmitted to the remote display device or console through the antenna. The use of the antenna ensures stable communication between the remote control car and the control center within a large range, improving the flexibility and safety of exploration and detection. However, if the antenna is blocked or shielded, the quality of data transmission will be greatly reduced.

[0030] In view of this, an embodiment of the present application provides a thermal imaging device. For example, Figure 1As shown, the thermal imaging device 100 includes an infrared detector module 1, a radio frequency module 2, a signal quality monitoring module 3, a first antenna 4 and a second antenna 5. The infrared detector module 1 is connected to the radio frequency module 2, the radio frequency module 2 is connected to the first antenna 4 and the second antenna 5, and the signal quality monitoring module 3 is connected to the radio frequency module 2.

[0031] The infrared detector module 1 is configured to sense the infrared radiation of the object to be detected, generate an electrical signal, and send the electrical signal to the radio frequency module 2. The signal quality monitoring module 3 is configured to detect the communication quality of the first antenna 4 and the communication quality of the second antenna 5, and send a first quality signal reflecting the communication quality of the first antenna 4 and a second quality signal reflecting the communication quality of the second antenna 5 to the radio frequency module 2. The radio frequency module 2 is configured to generate an infrared image data signal according to the electrical signal. Based on the first quality signal and the second quality signal, the infrared image data signal is selected to be sent to the first antenna 4 or the second antenna 5, wherein the communication quality of the selected antenna is higher than the communication quality of the unselected antenna.

[0032] The infrared detector module 1 in the thermal imaging device 100 provided in the present application can sense the infrared radiation of the object to be measured, and generate an electrical signal after photoelectric conversion. Since the infrared detector module 1 is connected to the radio frequency module 2, the infrared detector module 1 can send the electrical signal to the radio frequency module 2. The signal quality monitoring module 3 can detect the communication quality of the first antenna 4 and the communication quality of the second antenna 5, and send the first quality signal and the second quality signal to the radio frequency module 2. The first quality signal can reflect the communication quality of the first antenna 4, and the second quality signal can reflect the communication quality of the second antenna 5. The communication quality is also the quality of the infrared image data signal transmitted by the antenna (the first antenna 4 and the second antenna 5).

[0033] When the RF module transmits the infrared image data signal to the first antenna and the second antenna, it only transmits data to one of the antennas. The antenna that transmits data is called the selected antenna, and the antenna that does not transmit data is called the unselected antenna. In order to ensure that the infrared image data signal is always transmitted with high quality, the communication quality of the antenna must be detected in real time.

[0034] The radio frequency module 2 processes the electrical signal through digital signal processing and modulation, and then packages the data into an infrared image data signal that can be transmitted by the antenna. The antenna is selected based on the first quality signal and the second quality signal to transmit the infrared image data signal. When the communication quality of the first antenna 4 is poor, the data is switched to the second antenna 5, and when the communication quality of the second antenna 5 is poor, the data is switched to the first antenna 4, so that the infrared image data signal can always be transmitted through the antenna with high quality.

[0035] Although the present application adopts a two-antenna design, namely the first antenna and the second antenna, only one antenna is always transmitting during operation, and the antenna is switched only when the signal quality is poor. Therefore, the power consumption is the same as that required by the single-antenna solution. Since no additional energy is required to maintain the operation of multiple antennas, energy consumption is reduced. For thermal imaging devices or battery-powered devices, maintaining the same power consumption as the single-antenna solution means that there will be no additional burden on battery life, and the battery life of the device can be kept the same as that of a single-antenna system, which is particularly critical in detection scenarios that require long battery life. In addition, the reduction in power consumption reduces the heat dissipation of the thermal imaging device. In communication equipment, the RF module and antenna are the main sources of heat. By maintaining the same power consumption as a single antenna, the heat generated by the thermal imaging device is reduced, thereby improving the stability and service life of the device.

[0036] As a possible implementation manner, the communication quality of the selected antenna is higher than the communication quality of the unselected antenna, including that the signal-to-noise ratio of the unselected antenna is less than a first threshold, and the signal-to-noise ratio of the selected antenna is greater than the signal-to-noise ratio of the unselected antenna.

[0037] The signal-to-noise ratio (SNR) of an antenna refers to the ratio between the strength of the received signal and the strength of the background noise, usually expressed in decibels. SNR is an important indicator for measuring signal quality and reception performance in communication systems. A high SNR means that the signal received by the antenna is much stronger than the noise, the signal clarity is high, the communication link is relatively stable, and the bit error rate is low. A low SNR means that the noise received by the antenna is equal to or even exceeds the signal, which may cause unstable communication or data errors, and a high bit error rate.

[0038] The first threshold in "the signal-to-noise ratio of the unselected antenna is less than the first threshold, and the signal-to-noise ratio of the selected antenna is greater than the signal-to-noise ratio of the unselected antenna" refers to an average level of transmission quality, that is, when an antenna with a signal-to-noise ratio lower than the first threshold is used to transmit infrared image data signals, the communication link is unstable and the bit error rate is high. The signal-to-noise ratio of the selected antenna is greater than the signal-to-noise ratio of the unselected antenna, which ensures that the infrared image data signal can always be transmitted using an antenna with a higher transmission quality.

[0039] In some embodiments, the RF module selects to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal, including selecting to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal when the size of the data packet of the infrared image data signal is greater than a second threshold.

[0040] The second threshold is a preset upper limit of the data packet size, and the setting of the second threshold plays a limiting role.

[0041] Reference Figure 1 , the size of the data packet of the infrared image data signal is used as a prerequisite for whether to switch the antenna, so that the RF module 2 can make flexible decisions based on the size of the data packet of the infrared image data signal. When the data packet of the infrared image data signal is small, the infrared image data signal can be transmitted in a shorter time because the antenna has a higher transmission speed. At this time, even if the signal-to-noise ratio of the antenna transmitting the infrared image data signal is lower than that of the other antenna, the probability of error in the transmission of the infrared image data signal is relatively low. However, if the antenna is switched frequently, delays will be introduced, reducing the real-time performance of data transmission. Since it takes a certain amount of time for the signal quality monitoring module 3 to detect the first antenna 4 and the second antenna 5, it also takes a certain amount of time for the first quality signal and the second quality signal detected to be transmitted to the RF module 2, and it also takes a certain amount of time for the RF module 2 to make a decision and perform the switch. Although the antenna switching time of most modern RF thermal imaging devices 100 is very short (usually in the nanosecond to millisecond level), in some real-time application scenarios, the delay introduced by switching antennas may still affect the user experience or the performance of the thermal imaging device 100.

[0042] In addition, too frequent antenna switching will cause instability in the communication thermal imaging device 100, increase the calculation and decision-making burden of the thermal imaging device 100, and lead to an increase in overall power consumption, especially in the application scenarios where mobile devices or IoT devices are sensitive to power consumption. However, when the data packet of the infrared image data signal is large, the required transmission time is longer. If it is transmitted under the condition of unstable antenna transmission quality, the probability of data loss, retransmission, and delay may increase. Therefore, the thermal imaging device 100 will be more cautious in selecting an antenna with better signal quality. Therefore, when the size of the data packet of the infrared image data signal is greater than the second threshold, the RF module 2 chooses to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal. Especially in harsh transmission environments, the reliability of transmission is improved.

[0043] In other embodiments, reference Figure 1 The RF module 2 selects to send the infrared image data signal to the first antenna 4 or the second antenna 5 based on the first quality signal and the second quality signal, including selecting to send the infrared image data signal to the first antenna 4 or the second antenna 5 based on the first quality signal and the second quality signal when the size of the data packet of the infrared image data signal is greater than the second threshold and the difference in the signal-to-noise ratio between the first antenna 4 and the second antenna 5 is greater than the third threshold.

[0044] The third threshold refers to a set value of the difference between the signal-to-noise ratio of the first antenna 4 and the second antenna 5, which is used to determine whether the difference in signal quality between the first antenna 4 and the second antenna 5 is significant enough to trigger the determination of the antenna switching condition. The third threshold is set so that the difference in the signal-to-noise ratio of the two antennas must reach or exceed a certain preset level before it is determined that there is a sufficiently large difference in the signal quality of the antennas, which is worth switching the antennas. By setting the third threshold, unnecessary switching is prevented when the difference in antenna signal quality is not large, thereby improving the stability of the thermal imaging device 100.

[0045] As a possible implementation, Figure 2 As shown, the RF module 2 includes a RF circuit 21, a processing circuit 22, and a switch circuit 23. The input end 21-1 of the RF circuit 21 is connected to the infrared detector module 1, and the output end 21-2 of the RF circuit 21 is connected to the first input end 23-1 of the switch circuit 23. The first output end 23-2 of the switch circuit 23 is connected to the first antenna 4, and the second output end 23-3 of the switch circuit 23 is connected to the second antenna 5. The input end 22-1 of the processing circuit 22 is connected to the signal quality monitoring module 3, and the output end 22-2 of the processing circuit 22 is connected to the second input end 23-4 of the switch circuit 23.

[0046] The radio frequency circuit 21 is configured to receive an electrical signal, convert the electrical signal into an infrared image data signal, and transmit the infrared image data signal to the switch circuit 23. The processing circuit 22 is configured to control the first input terminal 23-1 and the first output terminal 23-2 of the switch circuit 23 to be connected according to the first quality signal and the second quality signal, so as to output the infrared image data to the first antenna 4. Alternatively, the first input terminal 23-1 and the second output terminal 23-3 of the switch circuit 23 are controlled to be connected, so as to output the infrared image data to the second antenna 5.

[0047] For example, the switch circuit is composed of Figure 3 As shown. The switch circuit 23 includes a first RF switch 231 and a second RF switch 232. The first end of the first RF switch 231 is connected to the first input end 23-1 of the switch circuit 23, the second end of the first RF switch 231 is connected to the first output end 23-2 of the switch circuit 23, and the control end of the first RF switch 231 is connected to the second input end 23-4 of the switch circuit 23. The first end of the second RF switch 232 is connected to the first input end 23-1 of the switch circuit 23, the second end of the second RF switch 232 is connected to the second output end 23-3 of the switch circuit 23, and the control end of the second RF switch 232 is connected to the second input end 23-4 of the switch circuit 23.

[0048] The infrared detector module 1 in the thermal imaging device absorbs the infrared radiation of the object to be measured, and is converted into an electrical signal after photoelectric conversion by the sensitive element inside the infrared detector module. After the electrical signal is transmitted to the radio frequency circuit 21, the radio frequency circuit 21 converts the analog electrical signal into a digital electrical signal, and after modulation, data packaging and other processing, the infrared image data signal is output to the switching circuit through the output terminal 21-2 of the radio frequency circuit 21.

[0049] Assuming that the thermal imaging device transmits the infrared image data signal through the first antenna 4 at the beginning, the first radio frequency switch 231 is in a closed state and the second radio frequency switch 232 is in an open state. In the process of transmitting the infrared image data signal through the first antenna 4, the signal quality monitoring module 3 continuously detects the communication quality of the first antenna 4 and the second antenna 5, and sends the generated first quality signal and second quality signal to the processing module. The processing module determines whether it is necessary to switch the antenna to transmit the image data signal according to the switching condition. Among them, the switching condition includes that the signal-to-noise ratio of the unselected antenna is less than the first threshold, and the signal-to-noise ratio of the selected antenna is greater than the signal-to-noise ratio of the unselected antenna.

[0050] As a possible implementation, Figure 4 As shown, the radio frequency circuit 21 is also connected to the processing circuit 22. In this case, the switching conditions include selecting to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal when the size of the data packet of the infrared image data signal is greater than the second threshold; and selecting to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal when the size of the data packet of the infrared image data signal is greater than the second threshold and the difference in the signal-to-noise ratio of the first antenna and the second antenna is greater than the third threshold.

[0051] When the first antenna 4 is blocked during the detection of the thermal imaging device, the communication quality of the first antenna 4 deteriorates. The processing circuit detects that the above switching condition is met at this time, and controls the control end of the first RF switch 231 to switch the first RF switch 231 from a closed state to an open state. At the same time, the processing circuit controls the control end of the second RF switch 232 to switch the second RF switch 232 from an open state to a closed state. The transmission of the infrared image data signal realizes the transition from the first antenna 4 to the second antenna 5.

[0052] In some embodiments, Figure 5 As shown, the thermal imaging device further includes a circuit board 6 and a packaging shell. The circuit board 6 is arranged inside the packaging shell. The infrared detector module 1, the radio frequency module, and the signal quality monitoring module are arranged on the circuit board 6. The first antenna 4 and the second antenna 5 are both arranged on the circuit board 6. Figure 5The first antenna 4 is shown to be disposed at one side of the circuit board in the thickness direction, and there is a preset distance between the second antenna 5 and the first antenna 4 .

[0053] There is a preset interval between the first antenna 4 and the second antenna 5, which can reduce mutual interference between the antennas so that each antenna can independently and effectively receive and transmit signals. When the antennas are too close, a coupling effect may occur, that is, the electromagnetic field of one antenna affects the performance of another antenna, which will greatly affect the antenna's gain, radiation characteristics, and reception and transmission efficiency. And spatial diversity can increase the reliability of the communication link. When one antenna is blocked, the other antenna may not be blocked, so that the infrared image data signal can be preferentially transmitted, enhancing the reliability of the thermal imaging device.

[0054] As a possible implementation, the isolation between the first antenna and the second antenna is greater than or equal to a fourth threshold, and an exemplary fourth threshold is 40db. The fourth threshold here refers to a preset minimum value of the isolation between the first antenna and the second antenna. Isolation refers to the degree of isolation of signals between two antennas, usually expressed in decibels. The greater the isolation, the less mutual interference between the two antennas and the less signal leakage. By setting the minimum isolation between the first antenna and the second antenna, that is, the size of the fourth threshold, signal leakage can be effectively prevented, and signal interference between the first antenna and the second antenna can be reduced, thereby improving the quality of signal transmission.

[0055] As a possible implementation, the encapsulation shell includes a detection part and a handle part connected to each other, the infrared detector module and the first antenna are located in the space enclosed by the detection part, and the second antenna is located in the space enclosed by the handle part. The thermal imaging device supports non-contact measurement such as handheld detection or forklift. The encapsulation shell provides support and protection for the thermal imaging device. The present application divides the encapsulation shell into two major areas, namely the detection part and the handle part. The first antenna and the second antenna are respectively arranged in the space enclosed by the detection part and the handle part of the encapsulation shell.

[0056] Furthermore, the first antenna is arranged on the area of ​​the circuit board close to the top of the detection part. At least part of the second antenna is connected to the inner wall of the bottom of the handle part. As a possible implementation, the first antenna is a printed circuit board antenna, and the second antenna is a flexible printed circuit antenna. The first antenna is directly connected to the circuit board, and the thickness direction of the first antenna intersects with one side surface of the circuit board in the thickness direction. For example, the first antenna is vertically welded on the circuit board. The projection of the first antenna on the packaging shell falls on the top of the detection part, and the second antenna itself does not contact the circuit board. The projection of a part of the second antenna connected to the circuit board through a spring pin on the packaging shell falls on the bottom of the handle part, and another part of the second antenna is connected to the inner wall of the bottom of the handle part on the packaging shell.

[0057] When handheld measurement is used, the tester will hold the handle portion of the package shell. At this time, the first antenna is not blocked, so the thermal imaging data can be efficiently transmitted through the first antenna. When non-contact measurement such as a forklift is used, the thermal imaging device will be fixed on the forklift. At this time, as the forklift moves, obstacles in the environment may block the first antenna. Since the first antenna and the second antenna are set in different positions, the second antenna may not be blocked. Therefore, the thermal imaging device can efficiently transmit the thermal imaging data through the second antenna. The second antenna is at least partially connected to the inner wall of the bottom of the handle portion so that the second antenna is set at an angle, that is, the blockage in the direction perpendicular to the plane of the circuit board or the blockage in the direction parallel to the plane of the circuit board cannot have a significant impact on the second antenna, so that the quality of thermal imaging data transmission is further guaranteed. The embodiment of the present application also provides a thermal imaging system, exemplarily, such as Figure 6 The thermal imaging system 200 includes a host computer 50 and the thermal imaging device 100 as described above. The host computer 50 is connected to the thermal imaging device 100, and the host computer 50 is configured to: receive infrared image data signals from the thermal imaging device 100, and output infrared images of the object to be measured.

[0058] The host computer 50 receives the infrared image data signal transmitted from the antenna in the thermal imaging device 100, and outputs the infrared image of the object to be measured after demodulation, digital-to-analog conversion, and image processing, thereby realizing infrared detection across space. The host computer 50 is also the remote display device or control console as mentioned above. The thermal imaging device 100 performs infrared detection on areas that are difficult for human intervention. The detected infrared image data signal is transmitted to the host computer 50 through the antenna. The staff analyzes the infrared image transmitted in real time, thereby realizing non-contact measurement. The dual antenna design, switching conditions, and dual antenna installation position setting in the thermal imaging device 100 ensure the transmission quality of the infrared image data signal, and improve the accuracy and reliability of the infrared image formed by the host computer 50 after conversion of the infrared image data signal.

[0059] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application.

[0060] Finally, it should be noted that the above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A thermal imaging device, characterized in that: It includes an infrared detector module, a radio frequency module, a signal quality monitoring module, a first antenna and a second antenna; The infrared detector module is connected to the radio frequency module, the radio frequency module is connected to the first antenna and the second antenna, and the signal quality monitoring module is connected to the radio frequency module; The infrared detector module is configured to: sense infrared radiation of the object to be detected, generate an electrical signal, and send the electrical signal to the radio frequency module; The signal quality monitoring module is configured to: detect the communication quality of the first antenna and the communication quality of the second antenna, and send a first quality signal reflecting the communication quality of the first antenna and a second quality signal reflecting the communication quality of the second antenna to the radio frequency module; The radio frequency module is configured to: generate an infrared image data signal based on the electrical signal; and select to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal; wherein the communication quality of the selected antenna is higher than the communication quality of the unselected antenna.

2. The thermal imaging device according to claim 1, characterized in that: The communication quality of the selected antenna is higher than the communication quality of the unselected antenna, including: The signal-to-noise ratio of the unselected antenna is less than a first threshold, and the signal-to-noise ratio of the selected antenna is greater than the signal-to-noise ratio of the unselected antenna.

3. The thermal imaging device according to claim 2, characterized in that: The step of selecting to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal comprises: When the size of the data packet of the infrared image data signal is greater than a second threshold, the infrared image data signal is sent to the first antenna or the second antenna based on the first quality signal and the second quality signal.

4. The thermal imaging device according to claim 2, characterized in that: The step of selecting to send the infrared image data signal to the first antenna or the second antenna based on the first quality signal and the second quality signal comprises: When the size of the data packet of the infrared image data signal is greater than a second threshold and the difference in signal-to-noise ratio between the first antenna and the second antenna is greater than a third threshold, based on the first quality signal and the second quality signal, select the first antenna or the second antenna to send the infrared image data signal.

5. The thermal imaging device according to any one of claims 1 to 4, characterized in that: The radio frequency module includes a radio frequency circuit, a processing circuit and a switching circuit; The input end of the radio frequency circuit is connected to the infrared detector module, and the output end of the radio frequency circuit is connected to the first input end of the switch circuit; The first output end of the switch circuit is connected to the first antenna, and the second output end of the switch circuit is connected to the second antenna; The input end of the processing circuit is connected to the signal quality monitoring module, and the output end of the processing circuit is connected to the second input end of the switch circuit; The radio frequency circuit is configured to receive the electrical signal, convert the electrical signal into the infrared image data signal, and transmit the infrared image data signal to the switch circuit; The processing circuit is configured to control the conduction between the first input terminal and the first output terminal of the switching circuit based on the first quality signal and the second quality signal to output the infrared image data to the first antenna; or to control the conduction between the first input terminal and the second output terminal of the switching circuit to output the infrared image data to the second antenna.

6. The thermal imaging device according to claim 5, characterized in that: The switch circuit includes a first radio frequency switch and a second radio frequency switch; A first end of the first RF switch is connected to a first input end of the switch circuit, a second end of the first RF switch is connected to a first output end of the switch circuit, and a control end of the first RF switch is connected to a second input end of the switch circuit; The first end of the second RF switch is connected to the first input end of the switch circuit, the second end of the second RF switch is connected to the second output end of the switch circuit, and the control end of the second RF switch is connected to the second input end of the switch circuit.

7. The thermal imaging device according to any one of claims 1 to 4, characterized in that: The thermal imaging device further comprises a circuit board and a packaging shell, wherein the circuit board is arranged inside the packaging shell; The infrared detector module, the radio frequency module, and the signal quality monitoring module are arranged on the circuit board; The first antenna and the second antenna are both connected to the circuit board, and there is a preset distance between the second antenna and the first antenna.

8. The thermal imaging device according to claim 7, characterized in that: The packaging shell includes a detection part and a handle part which are connected to each other. The infrared detector module and the first antenna are located in a space surrounded by the detection part, and the second antenna is located in a space surrounded by the handle part.

9. The thermal imaging device according to claim 8, characterized in that: The first antenna is a printed circuit board antenna, and the first antenna is arranged on a region of the circuit board close to the top of the detection part; The second antenna is a flexible printed circuit antenna, and at least a portion of the second antenna is connected to the inner wall of the bottom of the handle portion.

10. A thermal imaging system, characterized in that: It comprises a host computer and a thermal imaging device as claimed in any one of claims 1 to 9; The host computer is connected to the thermal imaging device, and is configured to receive infrared image data signals from the thermal imaging device and output an infrared image of the object to be measured.

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