Photonics integrated device, wearable temperature measuring device, fluorescence temperature measuring method and electronic device

Abstract

The application relates to the field of optical devices, and provides a photonic integrated device, a wearable temperature measuring device, a fluorescent temperature measuring method and electronic equipment, wherein the photonic integrated device comprises a wavelength division multiplexer, a multimode interference coupler and a mode spot converter; the wavelength division multiplexer, the multimode interference coupler and the mode spot converter are connected through waveguides to transfer light beams; the second end of the wavelength division multiplexer is used for inputting a light beam of a first wavelength; the third section of the wavelength division multiplexer is used for outputting a light beam of a second wavelength; the light beam of the second wavelength carries temperature data; the second end of the mode spot converter is used for outputting the light beam of the first wavelength and inputting the light beam of the second wavelength. The application solves the defects that the system is complex, bulky and not portable when the light beam is conducted through an optical fiber; the light beam is output and received through the waveguide in the scheme, the complexity of the wearable measuring system is reduced, and the portability is improved.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and in particular to a photonic integrated device, a wearable temperature measurement device, a fluorescence temperature measurement method, and an electronic device. Background Technology

[0002] Wearable measurement technology refers to wearing portable measurement devices on the body to sense and record various physiological characteristics and parameters of organisms through built-in or external sensors, so as to conveniently complete the health measurement of organisms. Common wearable measurement devices include smart bracelets.

[0003] Wearable measurement technology can be applied to the measurement of body temperature. Currently, most wearable temperature measurement technologies utilize optical thermometry. Compared to traditional contact thermometry, optical thermometry offers advantages such as high sensitivity, fast response, and resistance to electromagnetic interference. However, existing optical thermometry methods typically involve an electronic device emitting a laser to illuminate the skin and then demodulating the body temperature signal by receiving different reflections of the laser. This method is commonly used in wearable wristbands. This method requires the wristband to be in close contact with the skin and remain stable; otherwise, the accuracy of the measurement results will be affected. Furthermore, the need to wear a rigid wristband results in low comfort and convenience. Another method, using fiber optics for temperature measurement, is often used in petroleum and coal mining engineering. However, this method involves complex and bulky measurement systems, making it less portable. Summary of the Invention

[0004] This invention provides a photonic integrated device, a wearable temperature measurement device, a fluorescence temperature measurement method, and an electronic device to solve the problems of poor stability, low comfort, poor fit to the human body, low portability, and high complexity of the sensing system in existing wearable measurement technology. The solution in this application designs a micron-scale flexible photonic integrated device for wearable temperature measurement, which outputs and receives light beams through a waveguide, reducing the complexity of the wearable measurement system and improving portability.

[0005] This invention provides a photonic integrated device, comprising:

[0006] A wavelength division multiplexer, a multimode interference coupler, and a mode spot converter are provided, wherein the wavelength division multiplexer, the multimode interference coupler, and the mode spot converter are fabricated using waveguides, and the waveguide material meets the requirements for beam transmission.

[0007] The first end of the wavelength division multiplexer is connected to the first end of the multimode interference coupler;

[0008] The second end of the multimode interference coupler is connected to the first end of the mode spot converter;

[0009] The second end of the wavelength division multiplexer is used to input a beam of the first wavelength, and the third segment of the wavelength division multiplexer is used to output a beam of the second wavelength, which carries temperature data.

[0010] The second end of the speckle converter is used to output a beam of the first wavelength and to input a beam of the second wavelength.

[0011] The dimensions of the connection portion between the wavelength division multiplexer, the multimode interference coupler, and the mode spot converter satisfy the single-mode transmission of the beam of the first wavelength and the beam of the second wavelength.

[0012] The wavelength division multiplexer is used to filter and split the beam of the first wavelength and the beam of the second wavelength, and the structural parameters of the wavelength division multiplexer are adapted to the beam of the first wavelength and the beam of the second wavelength.

[0013] The multimode interference coupler is used to split and collect the beam of the first wavelength and the beam of the second wavelength, and the structural parameters of the multimode interference coupler are adapted to the beam of the first wavelength and the beam of the second wavelength.

[0014] The speckle converter is used to increase the divergence angle of the first wavelength light and increase the collection surface of the second wavelength light. The structural parameters of the speckle converter are adapted to the beam of the first wavelength and the beam of the second wavelength.

[0015] According to the photonic integrated device provided by the present invention, the first end of the multimode interference coupler includes an interface;

[0016] The second end of the multimode interference coupler includes at least two interfaces.

[0017] According to the photonic integrated device provided by the present invention, the number of interfaces at the first end of the mode converter is the same as the number of interfaces at the second end of the multimode interference coupler;

[0018] The number of interfaces at the second end of the pattern converter is the same as the number of interfaces at the first end of the pattern converter.

[0019] According to the photonic integrated device provided by the present invention, the first end of the multimode interference coupler is a straight waveguide;

[0020] The second end of the multimode interference coupler is a tapered waveguide;

[0021] A rectangular waveguide is also provided between the first end and the second end of the multimode interference coupler. The rectangular waveguide is used to uniformly split the light beam of the first wavelength input from the first end into several beams and output them from the second end of the multimode interference coupler.

[0022] The rectangular waveguide is also used to collect a beam of a second wavelength input from the second end and output it from the first end of the multimode interference coupler.

[0023] According to the photonic integrated device provided by the present invention, the mode converter includes a straight waveguide and a tapered waveguide;

[0024] The mode converter is connected to the second end of the multimode interference coupler via a straight waveguide;

[0025] The straight waveguide of the mode converter is connected to the first end of the tapered waveguide, and the cross-sectional area of ​​the second end of the tapered waveguide of the mode converter is larger than the cross-sectional area of ​​the first end.

[0026] According to the photonic integrated device provided by the present invention, the wavelength division multiplexer includes a tapered waveguide;

[0027] The wavelength division multiplexer is connected to the straight waveguide of the multimode interference coupler via a tapered waveguide.

[0028] The photonic integrated device provided by the present invention includes an encapsulation layer, a waveguide layer, and a substrate layer;

[0029] The waveguide layer and the substrate layer are made of flexible materials to enhance the flexibility and fit of the photonic integrated device;

[0030] The waveguide layer is located between the packaging layer and the substrate layer, and the waveguide layer includes the wavelength division multiplexer, the multimode interference coupler, and the mode speckle converter.

[0031] The present invention also provides a wearable temperature measurement device, including any of the above-mentioned photonic integrated devices.

[0032] The present invention also provides a fluorescence thermometry method, implemented by the above-mentioned wearable thermometry device, comprising:

[0033] A first wavelength light beam is output through a photonic integrated device, and a second wavelength light beam is collected through the same photonic integrated device. The second wavelength light beam is generated after the first wavelength light beam irradiates a fluorescent material, which is disposed on the second end surface of the mode converter of the photonic integrated device.

[0034] The temperature value of the object under test is determined by the fluorescence decay lifetime of the second wavelength beam.

[0035] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement any of the fluorescence temperature measurement methods described above.

[0036] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the fluorescence thermometry methods described above.

[0037] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements any of the fluorescence temperature measurement methods described above.

[0038] The photonic integrated device provided by this invention can transmit light beams through waveguide devices, achieving higher temperature sensing accuracy with lower complexity compared to fiber optic transmission. The wavelength division multiplexer within the photonic integrated device includes three ports. The light beam input at the second port is output to a multimode interference coupler via the first port, and then output to a mode converter via the multimode interference coupler. The first wavelength beam, after exiting the mode converter, can contact the object under test and is collected again by the mode converter to form a second wavelength beam. The second wavelength beam then passes sequentially through the mode converter and the multimode interference coupler before exiting the wavelength division multiplexer. The third output of the device carries the temperature information of the object being measured in a second-wavelength beam. This temperature information can be used for subsequent processing to determine the temperature value of the object. The transmission of the dual-band beam is achieved through a waveguide. Fluorescence-based temperature sensing is realized through a micron-scale flexible photonic integrated device. While ensuring the sensitivity of temperature measurement, the size of the device is greatly reduced, making it easier to integrate into clothing and other materials, achieving a close fit with the human body and greatly improving comfort and stability. Furthermore, the device's waveguide implements filtering and branching output, and its simple structure and high integration effectively reduce the overall complexity of the photonic integrated device and improve portability. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is one of the structural schematic diagrams of the photonic integrated device provided in the embodiments of the present invention;

[0041] Figure 2 This is a second schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention;

[0042] Figure 3 This is the third schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention;

[0043] Figure 4 This is the fourth schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention;

[0044] Figure 5 This is the fifth schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention;

[0045] Figure 6 This is the sixth schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention;

[0046] Figure 7 This is a schematic diagram of the wearable temperature measurement device provided in an embodiment of the present invention;

[0047] Figure 8 This is a schematic flowchart of the fluorescence thermometry method provided in an embodiment of the present invention;

[0048] Figure 9 This is a schematic diagram of the physical structure of the electronic device provided in an embodiment of the present invention.

[0049] in:

[0050] 1-Wavelength division multiplexer; 2-Multimode interference coupler; 3-Mode converter;

[0051] 4- Tapered waveguide of wavelength division multiplexer; 5- Second terminal of wavelength division multiplexer;

[0052] 6 - The third terminal of the wavelength division multiplexer; 7 - The straight waveguide of the multimode interference coupler;

[0053] 8 - Rectangular waveguide of multimode interference coupler; 9 - Tapered waveguide of multimode interference coupler;

[0054] 10-Straight waveguide for mode-spot converter; 11-Tapered waveguide for mode-spot converter;

[0055] 12-Substrate layer; 13-Waveguide layer; 14-Encapsulation layer; 15-Photonic integrated device;

[0056] 16-Fiber optic cable; 17-Demodulation module. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0058] Figure 1 This is one of the structural schematic diagrams of the photonic integrated device provided in the embodiments of the present invention.

[0059] Figure 2This is the second schematic diagram of the structure of the photonic integrated device provided in the embodiment of the present invention.

[0060] Figure 3 This is the third schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention.

[0061] Figure 4 This is the fourth schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention.

[0062] like Figures 1-4 As shown, this embodiment provides a photonic integrated device, including:

[0063] Wavelength division multiplexer 1, multimode interference coupler 2 and mode spot converter 3, wherein the wavelength division multiplexer 1, the multimode interference coupler 2 and the mode spot converter 3 are fabricated using waveguides, and the material of the waveguides meets the requirements for beam transmission;

[0064] The first end of the wavelength division multiplexer is connected to the first end of the multimode interference coupler;

[0065] The second end of the multimode interference coupler is connected to the first end of the mode spot converter;

[0066] The second terminal 5 of the wavelength division multiplexer is used to input a beam of the first wavelength, and the third terminal 6 of the wavelength division multiplexer is used to output a beam of the second wavelength, which carries temperature data.

[0067] The second end of the speckle converter is used to output a beam of the first wavelength and to input a beam of the second wavelength.

[0068] The dimensions of the connection portion between the wavelength division multiplexer, the multimode interference coupler, and the mode spot converter satisfy the single-mode transmission of the beam of the first wavelength and the beam of the second wavelength.

[0069] The wavelength division multiplexer is used to filter and split the beam of the first wavelength and the beam of the second wavelength, and the structural parameters of the wavelength division multiplexer are adapted to the beam of the first wavelength and the beam of the second wavelength.

[0070] The multimode interference coupler is used to split and collect the beam of the first wavelength and the beam of the second wavelength, and the structural parameters of the multimode interference coupler are adapted to the beam of the first wavelength and the beam of the second wavelength.

[0071] The speckle converter is used to increase the divergence angle of the first wavelength light and increase the collection surface of the second wavelength light. The structural parameters of the speckle converter are adapted to the beam of the first wavelength and the beam of the second wavelength.

[0072] In practical applications, the first wavelength beam can be a 395-nanometer beam, and the second wavelength beam can be a 610-nanometer beam.

[0073] In practice, the connection parts between the wavelength division multiplexer, the multimode interference coupler, and the mode spot converter can all be straight waveguides. The width and height of the straight waveguides in the connection parts can be specially designed for the first wavelength beam and the second wavelength beam, which can meet the low-loss transmission of single-mode beams of these two specific wavelengths in the straight waveguide.

[0074] Furthermore, the structural parameters of the wavelength division multiplexer can be specifically designed for the first and second wavelength beams, enabling better filtering and beam splitting for these two specific wavelengths. Similarly, the interference region and the positions of the first and second ends of the multimode interference coupler can be specifically designed for the first and second wavelength beams, achieving beam splitting and collection for both wavelengths. For the mode converter, this maximizes the divergence angle of the first wavelength beam to increase the contact area between the first wavelength beam and the object under test, while achieving maximum collection efficiency for the second wavelength beam and minimizing transmission loss.

[0075] In this embodiment, the photonic integrated device includes two beam transmission directions. In the first transmission direction, a beam of a first wavelength is input through the second terminal 5 of a wavelength division multiplexer (WDM), and sequentially passes through WDM 1, multimode interference coupler 2, and mode converter 3 before being output from the second terminal of the mode converter. In the second transmission direction, a beam of a second wavelength carrying temperature data is input into the photonic integrated device from the second terminal of the mode converter, and then sequentially passes through mode converter 3, multimode interference coupler 2, and WDM 1 before being output from the third terminal 6 of the WDM.

[0076] In the first transmission direction, this embodiment uses wavelength division multiplexing (WDM) technology to achieve the input of the first wavelength beam at a different port, and uses the principle of multimode interference to achieve equal power beam splitting of the input light, and outputs the beam at the maximum diffusion angle. In the second transmission direction, the principle of optical path reversibility and finite element analysis are used to optimize the device parameters, which enables the effective acquisition of the second wavelength beam. Furthermore, the first wavelength beam is filtered and split using the principle of WDM technology, thereby achieving the output of the second wavelength beam at a different port.

[0077] To address the issue of beam splitting between the first and second wavelength beams, this embodiment utilizes a trapezoidal waveguide with a width mismatched to the width of the transmission straight waveguide to form an interference region. This allows the second wavelength beam in the second transmission direction to be output along the arc-shaped waveguide, while the first wavelength beam in the first transmission direction enters the transmission waveguide along the straight waveguide. This achieves dual-band transmission splitting while effectively improving transmission efficiency and reducing transmission loss.

[0078] The photonic integrated device provided in this embodiment can transmit light beams through waveguide devices. Compared with fiber optic transmission, it can achieve higher temperature sensing accuracy with lower complexity. The wavelength division multiplexer in the photonic integrated device includes three ports. The light beam input at the second port is output to the multimode interference coupler through the first port, and then output to the mode speckle converter via the multimode interference coupler. The first wavelength light beam, after being output from the mode speckle converter, can contact the object under test and be collected again by the mode speckle converter to form the second wavelength light beam. The second wavelength light beam then passes through the mode speckle converter and the multimode interference coupler in sequence, and is output from the third port of the wavelength division multiplexer. The output second wavelength light beam carries the temperature information of the object under test. This temperature information can be used for subsequent processing to determine the temperature value of the object under test. The transmission of dual-band light beams is realized through waveguides. The structure is simple, the integration is high, and the overall complexity of the photonic integrated device is effectively reduced.

[0079] Figure 3 One implementation of a multimode interference coupler is illustrated.

[0080] like Figure 3 As shown in the exemplary embodiment, the first end of the multimode interference coupler includes an interface;

[0081] The second end of the multimode interference coupler includes at least two interfaces.

[0082] In an exemplary embodiment, the first end of the multimode interference coupler is a straight waveguide;

[0083] The second end of the multimode interference coupler is a tapered waveguide;

[0084] A rectangular waveguide is also provided between the first end and the second end of the multimode interference coupler. The rectangular waveguide is used to uniformly split the light beam of the first wavelength input from the first end into several beams and output them from the second end of the multimode interference coupler.

[0085] The rectangular waveguide is also used to collect a beam of a second wavelength input from the second end and output it from the first end of the multimode interference coupler.

[0086] In practical applications, such as Figure 3As shown, in a multimode interference coupler, a rectangular waveguide with a width much larger than the transmission waveguide is used to excite multimode interference. The light that has completed equal power beam splitting is transmitted to the next device, i.e., to the mode converter, through a small tapered waveguide of the same size.

[0087] To address the issue of emitting the first wavelength beam in the first transmission direction at the maximum diffusion angle, a tapered waveguide is used to expand the excitation light with minimal loss, thereby increasing the area for fluorescence excitation. Furthermore, by adjusting the width of the maximum and minimum ends of the tapered waveguide and its overall length, the convergence and collection of the second wavelength beam in the second transmission direction are achieved. By balancing these two functions through dimensional parameter adjustments, the transmission loss is minimized.

[0088] In practical applications, the projection of the first and second wavelength beams in the interference waveguide can be adjusted by adjusting the length of the rectangular waveguide, so that both wavelengths are output at the same port. By utilizing the reversibility of the optical path, the problem of collecting the second wavelength light in the second transmission direction can be solved by using the same device.

[0089] In an exemplary embodiment, the number of interfaces at the first end of the mode speckle converter is the same as the number of interfaces at the second end of the multimode interference coupler;

[0090] The number of interfaces at the second end of the pattern converter is the same as the number of interfaces at the first end of the pattern converter.

[0091] In an exemplary embodiment, the mode converter includes a straight waveguide and a tapered waveguide;

[0092] The mode converter is connected to the second end of the multimode interference coupler via a straight waveguide;

[0093] The straight waveguide 10 of the mode spot converter is connected to the first end of the tapered waveguide, and the cross-sectional area of ​​the second end of the tapered waveguide 11 of the mode spot converter is larger than the cross-sectional area of ​​the first end.

[0094] like Figure 3 and Figure 4 As shown, in practical applications, the second end of the multimode interference coupler 2 may include five tapered waveguides. Correspondingly, the first end of the mode spot converter may also include five straight waveguides, and the second end may include five tapered waveguides. The tapered waveguide 9 of the multimode interference coupler corresponds one-to-one with the straight waveguide 10 and tapered waveguide 11 of the mode spot converter.

[0095] In practical applications, the tapered waveguide 9 of the multimode interference coupler can be called a beam-splitting waveguide based on its function. The function of a beam-splitting waveguide is to divide a complete beam into several equal parts using the principle of mirror interference. This increases the contact area between the output beam and the object under test, thus improving the accuracy of temperature measurement. Similarly, the tapered waveguide 11 of the mode converter can be called a beam-expanding waveguide based on its function. The function of a beam-expanding waveguide is to change the shape of the beam, adjusting it from a thinner diameter to a thicker diameter, increasing the contact area between the beam and the object under test, and also improving the accuracy of temperature measurement.

[0096] Figure 2 One implementation of a wavelength division multiplexer is illustrated.

[0097] like Figure 2 As shown in the exemplary embodiment, the wavelength division multiplexer includes a tapered waveguide;

[0098] The tapered waveguide 4 of the wavelength division multiplexer is connected to the straight waveguide of the multimode interference coupler.

[0099] Figure 5 This is the fifth schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention.

[0100] Figure 6 This is the sixth schematic diagram of the structure of the photonic integrated device provided in the embodiments of the present invention.

[0101] like Figure 5 and Figure 6 As shown in the exemplary embodiment, the photonic integrated device includes an encapsulation layer 14, a waveguide layer 13, and a substrate layer 12;

[0102] The waveguide layer 13 is located between the encapsulation layer 14 and the substrate layer 12, and the waveguide layer includes the wavelength division multiplexer, the multimode interference coupler and the mode speckle converter.

[0103] In practical applications, the substrate and encapsulation layers can be made of polydimethylsiloxane, and the waveguide layer can be made of polymethyl methacrylate.

[0104] In an exemplary embodiment, the thickness of the encapsulation layer can be 5 micrometers, the thickness of the substrate layer can be 5 micrometers, the thickness of the waveguide layer can be 1 micrometer, the width of the second port of the wavelength division multiplexer can be 1 micrometer, the length can be 50 micrometers, the width of the third port 6 of the wavelength division multiplexer can be 2 micrometers, the length can be 50 micrometers, and the curvature can be 0.9; the length of the tapered waveguide of the wavelength division multiplexer can be 30 micrometers, the width of the end near the second port can be 3 micrometers, and the width of the end near the multimode interference coupler can be 1 micrometer; the width of the straight waveguide 7 of the multimode interference coupler can be 1 micrometer, the length can be 50 micrometers, and the rectangular waveguide of the multimode interference coupler... The bandwidth of the waveguide can be 25 micrometers and the length can be 950 nanometers. The length of the beam splitter waveguide of the multimode interference coupler can be 20 micrometers, the width of the end near the rectangular waveguide is 2 micrometers, the width of the end of the rectangular waveguide is 1 micrometer, and the spacing between each beam splitter waveguide is 5 micrometers. The width of the straight waveguide of the mode speckle converter can be 1 micrometer and the length can be 5 micrometers. The spacing between multiple straight waveguides of the mode speckle converter can be 5 micrometers. The length of the beam expander waveguide of the mode speckle converter can be 8 micrometers, the width of the end near the multimode interference coupler can be 1 micrometer, and the width of the end away from the multimode interference coupler can be 5 micrometers.

[0105] In this embodiment, by controlling the length and width of each component in the photonic integrated device, the optical transmission efficiency of the photonic integrated device can be changed and maximized. Specifically, in practical applications, the transmission efficiency of the first wavelength beam in this embodiment is 57% when passing through the wavelength division multiplexing device, 90% when passing through the multimode interference coupler, and 59% when passing through the mode converter, with a total transmittance of 30%. The transmission efficiency of the second wavelength beam is 65% when passing through the mode converter, 49% when passing through the multimode interference coupler, and 89% when passing through the wavelength division multiplexing device, with a total fluorescence transmittance of 28%. Overall, the photonic integrated device in this embodiment has high data transmission efficiency.

[0106] This embodiment also provides a wearable temperature measurement device, including the photonic integrated device described in any of the above embodiments.

[0107] Figure 7 This is a schematic diagram of the wearable temperature measurement device provided in an embodiment of the present invention.

[0108] like Figure 7As shown, in practical applications, the photonic integrated device 15 can be encapsulated under the armpit of clothing. The output port of the photonic integrated device 15 is connected to the optical fiber 16, which is woven into the clothing. The optical fiber 16 transmits the optical signal to the demodulation module 17, which is encapsulated in the pocket of the clothing. The demodulation module 17 demodulates the optical signal to realize a wearable temperature measurement device. In practice, this invention can also be encapsulated in a soldier's helmet for real-time monitoring of the soldier's body temperature.

[0109] The wearable temperature measurement device provided in this embodiment is implemented using a waveguide, and the waveguide material is chosen to have sufficient refractive index to ensure beam transmission. The substrate and waveguide layers in the photonic integrator can be made of flexible materials, greatly enhancing the device's flexibility and fit, thus improving comfort in wearable measurements. Furthermore, the micron-scale device offers higher temperature sensitivity, and the fluorescence thermometry method based on the wearable temperature measurement device eliminates the influence of force on temperature measurement. While achieving fluorescence lifetime temperature measurement sensing, it also enables filtering and beam splitting, significantly reducing the overall system complexity of the sensing system.

[0110] The fluorescence thermometry method provided by the present invention is described below. The fluorescence thermometry method described below can be referred to in correspondence with the photonic integrated device described above.

[0111] Figure 8 This is a schematic flowchart of the fluorescence thermometry method provided in an embodiment of the present invention.

[0112] like Figure 8 As shown, the fluorescence thermometry method provided in this embodiment is implemented by the aforementioned wearable thermometry device, and the method includes:

[0113] Step 801: A light beam of a first wavelength is output through the photonic integrated device, and a light beam of a second wavelength is collected through the photonic integrated device. The second wavelength light beam is generated after the first wavelength light beam irradiates the fluorescent material, and the fluorescent material is disposed on the second end surface of the mode converter of the photonic integrated device.

[0114] Step 802: By fitting the fluorescence lifetime curve using the fluorescence decay time of the second wavelength, the temperature value of the object under test is determined.

[0115] In practice, the fluorescent material is placed on the port surface of the second end of the speckle converter, and after encapsulation, the entire device comes into contact with the temperature field to be measured.

[0116] In practical applications, a 10Hz pulsed excitation light can be continuously output from the second terminal of the mode converter of the photonic integrated device. The frequency of the pulsed laser light can be set according to the fluorescence lifetime of the selected fluorescent material. Furthermore, the wavelengths of the first wavelength beam input to the second terminal of the wavelength division multiplexer of the photonic integrated device and the second wavelength beam output from the third segment are also related to the selection of the fluorescent material. When the excitation light disappears, the fluorescence emitted by the fluorescent material on the object under test is output from the port and received by the photonic integrated device. Then, the fluorescence decay curve can be determined, and the lifetime curve from fluorescence generation to extinction can be obtained by inversion. A calibrated temperature value is then fitted to achieve real-time temperature measurement demodulation. That is to say, changes in the surface temperature of the object under test will affect the fluorescence lifetime curve, and there is a one-to-one correspondence between the temperature value and the fluorescence lifetime curve. In this embodiment, the temperature value of the object surface is determined by determining the fluorescence lifetime curve.

[0117] Figure 9 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 9 As shown, the electronic device may include: a processor 910, a communication interface 920, a memory 930, and a communication bus 940, wherein the processor 910, the communication interface 920, and the memory 930 communicate with each other via the communication bus 940. The processor 910 can call logic instructions in the memory 930 to execute a fluorescence thermometry method, which includes:

[0118] A first wavelength light beam is output through a photonic integrated device, and a second wavelength light beam is collected through the same photonic integrated device. The second wavelength light beam is generated after the first wavelength light beam irradiates a fluorescent material, which is disposed on the second end surface of the mode converter of the photonic integrated device.

[0119] The temperature value of the object under test is determined by the wavelength and intensity of the second wavelength beam.

[0120] Furthermore, the logical instructions in the aforementioned memory 930 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0121] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to perform the fluorescence thermometry method provided by the above methods, the method comprising:

[0122] A first wavelength light beam is output through a photonic integrated device, and a second wavelength light beam is collected through the same photonic integrated device. The second wavelength light beam is generated after the first wavelength light beam irradiates a fluorescent material. The fluorescent material is disposed on the second end surface of the mode converter of the photonic integrated device.

[0123] The temperature value of the object under test is determined by the wavelength and intensity of the second wavelength beam.

[0124] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the fluorescence thermometry method provided by the methods described above, the method comprising:

[0125] A first wavelength light beam is output through a photonic integrated device, and a second wavelength light beam is collected through the same photonic integrated device. The second wavelength light beam is generated after the first wavelength light beam irradiates a fluorescent material. The fluorescent material is disposed on the second end surface of the mode converter of the photonic integrated device.

[0126] The temperature value of the object under test is determined by the wavelength and intensity of the second wavelength beam.

[0127] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0128] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Photonic integrated device, characterized in that, include: A wavelength division multiplexer, a multimode interference coupler, and a mode spot converter are provided, wherein the wavelength division multiplexer, the multimode interference coupler, and the mode spot converter are fabricated using waveguides, and the waveguide material meets the requirements for beam transmission. The first end of the wavelength division multiplexer is connected to the first end of the multimode interference coupler; The second end of the multimode interference coupler is connected to the first end of the mode spot converter; The second end of the wavelength division multiplexer is used to input a light beam of the first wavelength, and the third end of the wavelength division multiplexer is used to output a light beam of the second wavelength. The light beam of the second wavelength carries temperature data and is generated after the light beam of the first wavelength is irradiated onto a fluorescent material. The fluorescent material is disposed on the surface of the second end of the mode converter. The second end of the speckle converter is used to output a beam of the first wavelength and to input a beam of the second wavelength. The dimensions of the connection portion between the wavelength division multiplexer, the multimode interference coupler, and the mode spot converter satisfy the single-mode transmission of the beam of the first wavelength and the beam of the second wavelength. The wavelength division multiplexer is used to filter and split the beam of the first wavelength and the beam of the second wavelength, and the structural parameters of the wavelength division multiplexer are adapted to the beam of the first wavelength and the beam of the second wavelength. The multimode interference coupler is used to split and collect the beam of the first wavelength and the beam of the second wavelength, and the structural parameters of the multimode interference coupler are adapted to the beam of the first wavelength and the beam of the second wavelength. The modulus converter is used to increase the divergence angle of the first wavelength light and increase the collection surface of the second wavelength light. The structural parameters of the modulus converter are adapted to the beam of the first wavelength and the beam of the second wavelength. The temperature of the object under test is determined by measuring the fluorescence decay lifetime of the second wavelength beam.

2. The photonic integrated device of claim 1, wherein, The first end of the multimode interference coupler includes an interface; The second end of the multimode interference coupler includes at least two interfaces.

3. The photonic integrated device according to claim 2, wherein, The number of interfaces at the first end of the speckle converter is the same as the number of interfaces at the second end of the multimode interference coupler; The number of interfaces at the second end of the pattern converter is the same as the number of interfaces at the first end of the pattern converter.

4. The photonic integrated device according to claim 1, characterized in that, The first end of the multimode interference coupler is a straight waveguide; The second end of the multimode interference coupler is a tapered waveguide; A rectangular waveguide is also provided between the first end and the second end of the multimode interference coupler. The rectangular waveguide is used to uniformly split the light beam of the first wavelength input from the first end into several beams and output them from the second end of the multimode interference coupler. The rectangular waveguide is also used to collect a beam of a second wavelength input from the second end and output it from the first end of the multimode interference coupler.

5. The photonic integrated device of claim 1, wherein, The mode converter includes a straight waveguide and a tapered waveguide; The mode converter is connected to the second end of the multimode interference coupler via a straight waveguide; The straight waveguide of the mode converter is connected to the first end of the tapered waveguide, and the cross-sectional area of ​​the second end of the tapered waveguide of the mode converter is larger than the cross-sectional area of ​​the first end.

6. The photonic integrated device of claim 1, wherein, The wavelength division multiplexer includes a tapered waveguide; The wavelength division multiplexer is connected to the straight waveguide of the multimode interference coupler via a tapered waveguide.

7. The photonic integrated device of claim 1, wherein, Includes a packaging layer, a waveguide layer, and a substrate layer; The waveguide layer and the substrate layer are made of flexible materials to enhance the flexibility and fit of the photonic integrated device; The waveguide layer is located between the packaging layer and the substrate layer, and the waveguide layer includes the wavelength division multiplexer, the multimode interference coupler, and the mode speckle converter.

8. The wearable temperature measuring device, characterized in that, Includes the photonic integrated device according to any one of claims 1-7.

9. Fluorescent thermometry method, implemented by means of the wearable thermometry device of claim 8, characterized in that, include: A first wavelength light beam is output through a photonic integrated device, and a second wavelength light beam is collected through the same photonic integrated device. The second wavelength light beam is generated after the first wavelength light beam irradiates a fluorescent material, which is disposed on the second end surface of the mode converter of the photonic integrated device. The temperature of the object under test is determined by measuring the fluorescence decay lifetime of the second wavelength beam.

10. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the fluorescence thermometry method as described in claim 9.

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