High-precision low-power-consumption liquid temperature measurement system based on photoelectric conversion and use method thereof

Abstract

The invention discloses a high-precision low-power-consumption liquid temperature measurement system based on photoelectric conversion and a use method thereof, and belongs to the technical field of instrument measurement. The system comprises a power supply module used for providing working voltage; the light source module is used for emitting light signals; the signal transmission module is used for transmitting the optical signal to the liquid sample to be subjected to temperature measurement; the liquid container is used for containing a liquid sample to be subjected to temperature measurement; the signal processing module is used for collecting and amplifying an optical signal passing through the liquid sample to be subjected to temperature measurement and converting the optical signal into an electric signal; the microprocessor is used for receiving the electric signal sent by the signal processing module and calculating the temperature value of the liquid sample to be subjected to temperature measurement according to a voltage-temperature model; and the display module is used for displaying the temperature value of the liquid sample to be subjected to temperature measurement. High-efficiency, high-precision and low-cost temperature measurement is realized, stable and reliable temperature data can be provided in a long-distance and complex environment through an optical fiber sensing technology, and the temperature sensor is suitable for high-temperature monitoring in the industries of electric power, petroleum, chemical engineering and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber sensing, and in particular relates to a high-precision, low-power consumption liquid temperature measurement system based on photoelectric conversion and a use method thereof. Background Art

[0002] Temperature is one of the most basic environmental parameters. Measuring the temperature of liquids has important applications in the chemical, petroleum, food and other industries. A temperature sensor is a device that detects and measures temperature. It can convert temperature changes into electrical signals for easy reading, recording, control or display. According to their working principles, temperature sensors can be divided into two categories: contact and non-contact. Contact temperature sensors need to be in physical contact with the object being measured. Common contact temperature sensors include thermocouples, thermal resistors and thermistors. Thermocouples are composed of two different metals or alloy materials, and use the property that the thermoelectric potential difference changes with temperature to measure temperature. Thermal resistors use the property that the material resistance changes with temperature, while thermistors are semiconductor materials whose resistance value changes significantly with temperature. Although contact temperature sensors have the advantages of high measurement accuracy and simple structure in some applications, they have long response time, are not suitable for moving or small targets, and have low sensitivity.

[0003] Non-contact temperature sensors measure temperature by detecting infrared radiation emitted by objects. At present, the technology of fiber optic temperature sensors is relatively mature, among which distributed fiber optic temperature sensors (Distributed Temperature Sensing, DTS) and fiber Bragg Grating Temperature Sensor (Fiber Bragg Grating Temperature Sensor, FBGTS) are the mainstream. However, whether it is the Raman scattering principle used in DTS or the grating spectroscopic principle used in FBGTS, it is inseparable from the demodulation of the output light wave. In the demodulation process, expensive instruments such as optical demodulators or optical mass spectrometers are still needed to convert optical signals. Even if the temperature is accurate and the loss is avoided, it is difficult for us to afford it in daily life, lacking practicality and convenience.

[0004] Therefore, it is very necessary to design an optical fiber temperature measurement device that is suitable for long-distance measurement and has high sensitivity, rapid response, strong anti-interference, accurate measurement, and low price. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a high-precision, low-power liquid temperature measurement system based on photoelectric conversion and a method of using the same, so as to solve the technical problem of how to design a fiber optic temperature measurement device that is suitable for long-distance measurement and has high sensitivity, fast response, strong anti-interference, accurate measurement and low price, so as to achieve high-efficiency, high-precision and low-cost optical fiber measurement of liquid temperature.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a high-precision, low-power consumption liquid temperature measurement system based on photoelectric conversion, comprising: A power module, used for providing working voltage; A light source module, used for emitting light signals; A signal transmission module, used for transmitting the light signal emitted by the light source module to the liquid sample to be temperature measured; A liquid container, used for holding a liquid sample to be temperature measured; A signal processing module is used to collect and amplify the optical signal passing through the liquid sample to be measured, and convert the optical signal into an electrical signal and transmit it to the microprocessor; A microprocessor is used to receive the electrical signal sent by the signal processing module and calculate the temperature value of the liquid sample to be measured according to the voltage-temperature model; The display module is used to display the temperature value of the liquid sample to be measured calculated by the microprocessor.

[0007] Preferably, the power module is connected to the signal processing module, the microprocessor and the display module respectively; the liquid container is arranged between the light source module and the signal processing module, and the signal transmission module passes through the liquid container.

[0008] Preferably, the liquid container and the microprocessor are installed inside the housing; the light source module is installed outside the housing and connected to the signal transmission module.

[0009] Preferably, the light source module is a laser pen, and the output power of the laser pen is 15 mW.

[0010] Preferably, the signal transmission module is a single-mode optical fiber, and the type of the signal transmission module is G.652D; the insertion loss of the signal transmission module is 0.3dB, return loss 50dB.

[0011] Preferably, the signal processing module amplifies the electrical signal through an avalanche photodiode, and converts the optical signal into an electrical signal through a photoelectric IV conversion amplifier module; the photoelectric IV conversion amplifier module is a YK-APD01AC photoelectric IV conversion amplifier module.

[0012] Preferably, the microprocessor is a single-chip microcomputer; the single-chip microcomputer is a stm32F103C8T6 single-chip microcomputer.

[0013] Preferably, the liquid container is composed of an L-shaped partition with a length of 17 cm and a width of 8 cm arranged inside the shell; the shell is made of acrylic material and the upper end is a semi-open structure; the thickness of the shell is 3 mm.

[0014] Preferably, the voltage-temperature model is: T=60.12×U-5.33 Among them, U is the voltage and T is the temperature of the liquid.

[0015] The present invention also discloses a method for using the above-mentioned high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion, which comprises the following steps: 1) Turn on the power supply, the power module provides the working voltage, and the signal processing module, microprocessor and display module start automatically; 2) Turn on the light source module and add the liquid sample to be measured into the liquid container; the light signal emitted by the light source module is transmitted to the liquid sample to be measured through the signal transmission module, and then transmitted to the signal processing module through the liquid sample to be measured; the signal processing module amplifies the light signal passing through the liquid sample to be measured and converts it into an electrical signal and transmits it to the microprocessor; 3) The microprocessor receives the electrical signal sent by the signal processing module and calculates the temperature value of the liquid sample to be measured according to the voltage-temperature model; 4) Observe the temperature value of the liquid sample to be measured calculated by the microprocessor through the display module, and obtain the temperature of the liquid sample to be measured after the reading stabilizes.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a high-precision, low-power liquid temperature measurement system based on photoelectric conversion. When the temperature of the liquid contacted by the signal transmission module changes, its refractive index will also change accordingly, and the luminous intensity received by the signal processing module will also change. Accordingly, a fixed light source is used to provide an optical signal for the system. After the signal transmission module passes through a liquid container containing a liquid sample to be measured at an initial temperature (before heating), the optical signal is transmitted to the signal processing module for amplification and conversion of the optical signal into an electrical signal, and then the electrical signal is transmitted to a microprocessor. After data processing, the microprocessor displays the temperature of the liquid sample to be measured through a display module, and records the voltage and the corresponding temperature value at this time. By heating the liquid sample to be measured contained in the liquid container, the temperature values ​​corresponding to the voltage values ​​are recorded in sequence, and the voltage-temperature relationship can be obtained. According to the voltage-temperature relationship, a mathematical model is established and stored in the microprocessor of the system. When detecting the liquid to be measured of unknown temperature, first ensure that the light source module, the signal transmission module, and the signal processing module are on the same horizontal plane to avoid light leakage and transmission loss; secondly, cover the upper part of the liquid container with a cover to avoid temperature loss and data error. A liquid container is arranged between the light source module and the signal processing module, so that the signal transmission module can more fully sense the temperature change and transmit the light signal to the signal processing module. The signal processing module collects and amplifies the light signal of the liquid sample immersed in different temperatures, and converts the light signal into an electrical signal and transmits it to the microprocessor. The microprocessor obtains the temperature value of the liquid to be measured according to the voltage-temperature mathematical model and displays it through the display module. The present invention can accurately capture the slight change of the liquid refractive index caused by the temperature change by monitoring the intensity change of the light signal after transmission in the liquid, thereby realizing high-precision temperature measurement. A fixed light source and a stable signal processing module are adopted to ensure the stability and repeatability of the measurement results. By establishing a voltage-temperature mathematical model and storing it in the microprocessor, the electrical signal can be accurately converted into a temperature value, further improving the measurement accuracy. The use of a low-power light source and a signal processing module reduces energy consumption and prolongs battery life, and is suitable for application scenarios that require long-term continuous monitoring. By optimizing the signal transmission path and reducing unnecessary electronic components, power consumption is further reduced and energy utilization efficiency is improved. The operation is convenient, and the user only needs to put the liquid sample to be measured into the liquid container to automatically complete temperature measurement and display. It has high stability and reliability, reducing maintenance costs and time. It can be applied to various scenarios that require measuring liquid temperature, such as laboratories, industrial production, environmental monitoring and other fields. By adjusting the wavelength of the light source and the parameters of the signal processing module, the system can also adapt to the needs of different liquids and measurement ranges. It can display the temperature value of the liquid to be measured in real time, so that users can understand and grasp the temperature changes of the liquid in a timely manner. By continuously recording the temperature value corresponding to the voltage value, dynamic monitoring and data analysis can also be achieved, providing strong support for users' decision-making.The design adopts that the light source module and the signal processing module are on the same horizontal plane, which effectively avoids the transmission loss caused by light leakage.

[0017] Furthermore, the signal transmission module is a single-mode optical fiber, which is inexpensive compared to other types of optical fibers. Single-mode optical fiber has the characteristics of high resolution and high sensitivity. It can better sense changes in ambient temperature and achieve the output of high-power, high-quality optical signals, thereby better monitoring real-time changes in temperature.

[0018] Furthermore, the housing not only provides a stable structure, making the connection between each module more compact, but also makes the system more beautiful. This high-precision liquid temperature measurement system based on optical fiber can transmit and record data over long distances, and can be applied to more complex environments, effectively solving the problem that the measurement results of mercury thermometers cannot be transmitted or recorded over long distances and are fragile. Real-time monitoring of temperature changes is achieved.

[0019] Furthermore, the power module is composed of a DC adjustable power template and a 12V lithium battery pack, which provides working voltage for the signal processing module, the microprocessor and the display module.

[0020] Furthermore, the output power of the laser pen selected in the present invention is 15 mW.

[0021] Furthermore, the signal transmission module type is selected as G.652D, and the insertion loss 0.3dB, return loss 50dB single-mode fiber to reduce optical loss.

[0022] Furthermore, an L-shaped partition with a length of 17 cm and a width of 8 cm is arranged inside the shell, which can effectively reduce heat loss.

[0023] Furthermore, the signal processing module includes a 905nm silicon 500um avalanche photodiode and a YK-APD01AC photoelectric IV conversion amplifier module, wherein the input frequency range of the photoelectric IV conversion amplifier module is DC-150MHz, which can realize the input of low-frequency alternating and DC optical signals, and the optical signal intensity is increased.

[0024] Furthermore, the microprocessor selects the stm32F103C8T6 single-chip microcomputer, which has low cost and can process data stably and quickly.

[0025] Furthermore, the outer shell is made of acrylic material with a thickness of 3mm, and the integrated structure is strong. The upper end is a semi-open structure, which can effectively reduce the heat loss in the liquid container area and improve the accuracy of the temperature measured by the system.

[0026] The present invention also discloses a method for using the above-mentioned high-precision, low-power consumption liquid temperature measurement system based on photoelectric conversion. By using the different refractive indices of optical fibers at different temperatures, it is possible to monitor the corresponding voltage value through photoelectric conversion and establish a voltage-temperature data model. Through the principle of thermorefractive effect, a stable light source, a photoelectric conversion device, and an intuitive reading display, high-efficiency, high-precision, and low-cost temperature measurement is achieved. The method of use is simple and easy to operate. The user only needs to pour the liquid sample to be measured into a liquid container to obtain its temperature value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a principle diagram of the high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion disclosed by the present invention; Figure 2 It is a structural schematic diagram of a high-precision, low-power consumption liquid temperature measurement system based on photoelectric conversion disclosed in the present invention; Figure 3 This is a graph showing the relationship between the temperature and voltage of the liquid sample to be measured.

[0028] Among them: 1. Light source module; 2. Signal transmission module; 3. Signal processing module; 4. Liquid container; 5. Microprocessor; 6. Display module; 7. Housing; 8. Power module; 9. Laser pen; 10. Single-mode optical fiber; 11. Avalanche photodiode; 12. Photoelectric IV conversion amplifier module; 13. DC adjustable power supply template; 14. Lithium battery pack; 15. OLED display; 16. Single-chip microcomputer. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings: The present invention discloses a high-precision, low-power consumption liquid temperature measurement system based on photoelectric conversion, comprising: A light source module 1, a signal transmission module 2 horizontally connected to the light source module 1, a signal processing module 3 connected to the signal transmission module 2, a liquid container 4 disposed between the light source module 1 and the signal processing module 3 and through which the signal transmission module 2 passes, a microprocessor 5 connected to the signal processing module 3, a display module 6 connected to the microprocessor 5, and a housing 7 covering the outer sides of the liquid container 4 and the microprocessor 5; The light source module 1 is a laser pen 9, which is used to transmit signals; The signal transmission module 2 is a single-mode optical fiber 10, which is used to transmit optical signals; A liquid container 4, used for containing a liquid sample to be tested for temperature; The light signal emitted by the light source module 1 is transmitted to the signal processing module 3 through the signal transmission module 2 after passing through the liquid sample to be measured; The signal processing module 3 is used to collect and amplify the optical signals of the liquid samples to be tested immersed in different temperatures; and convert the optical signals into electrical signals; The microprocessor 5 is used to receive the electrical signal and calculate the temperature value of the liquid sample to be measured according to the voltage-temperature model; The display module 6 is used to display the temperature of the liquid sample to be measured calculated by the microprocessor 5 .

[0032] Preferably, it further comprises a power supply module 8, which is respectively connected to the signal processing module 3, the microprocessor 5 and the display module 6 for providing a working voltage.

[0033] The light source module 1 is installed outside the housing 7 and connected to the signal transmission module 2; the output power of the laser pen 9 is 15 mW.

[0034] The type of signal transmission module 2 is G.652D, and its insertion loss 0.3dB, return loss 50dB.

[0035] The thickness of the liquid container 4 is 17 cm in length and 8 cm in width. An L-shaped partition with a length of 17 cm and a width of 8 cm is arranged inside the shell 7, so that the liquid sample to be measured in temperature can be placed thereon.

[0036] The signal processing module 3 amplifies the electrical signal through the avalanche photodiode 11, and the photoelectric IV conversion amplifier module 12 converts the optical signal into an electrical signal; the avalanche photodiode 11 is an APD avalanche photodiode; the photoelectric IV conversion amplifier module 12 is a YK-APD01AC photoelectric IV conversion amplifier module.

[0037] The microprocessor 5 is a single chip microcomputer 16 , which is a stm32F103C8T6 single chip microcomputer and is fixed outside the housing 7 .

[0038] The voltage-temperature model is: T = 60.12 × U - 5.33; Among them, U is the voltage and T is the temperature of the liquid.

[0039] The outer shell 7 is made of acrylic material, has a thickness of 3 mm, and has a semi-open structure at the upper end.

[0040] The method for using the high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion disclosed in the present invention comprises the following steps: 1) When the power is turned on, the signal processing module 3, the microprocessor 5 and the display module 6 start automatically; 2) Turn on the light source module 1 and add the liquid sample to be measured into the liquid container 4; the signal transmission module 2 transmits the signal to the signal processing module 3 after containing the liquid sample to be measured; the signal processing module 3 amplifies the light signal and converts it into an electrical signal and transmits it to the microprocessor 5; the microprocessor 5 receives the electrical signal sent by the signal processing module 3, and calculates the temperature value of the liquid sample to be measured according to the voltage-temperature model; the temperature value of the liquid sample to be measured calculated by the microprocessor 5 is observed through the display module 6; 3) Cover the housing 7 with a cover plate, observe the reading of the display module 6, and when the reading stabilizes, obtain the temperature of the liquid sample to be tested.

[0041] Example 1 A high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion, comprising: A power supply module 8, used for providing a working voltage; Light source module 1, used for emitting light signals; The signal transmission module 2 is used to transmit the light signal emitted by the light source module 1 to the liquid sample to be measured; Liquid container 4, used for holding the liquid sample to be temperature measured; The signal processing module 3 is used to collect and amplify the optical signal passing through the liquid sample to be measured, and convert the optical signal into an electrical signal and transmit it to the microprocessor 5; The microprocessor 5 is used to receive the electrical signal sent by the signal processing module 3 and calculate the temperature value of the liquid sample to be measured according to the voltage-temperature model; The display module 6 is used to display the temperature value of the liquid sample to be measured calculated by the microprocessor 5 .

[0042] Example 2 A high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion, comprising: The power module 8 is used to provide a working voltage; the power module 8 is composed of a DC adjustable power template 13 and a lithium battery pack 14; The light source module 1 is used to emit light signals; the light source module 1 is a laser pen 9, and the output power of the laser pen 9 is 15 mW.

[0043] The signal transmission module 2 is used to transmit the optical signal emitted by the light source module 1 to the liquid sample to be measured; the signal transmission module 2 is a single-mode optical fiber 10, and the type of the signal transmission module 2 is G.652D; the insertion loss of the signal transmission module 2 is 0.3dB, return loss 50dB.

[0044] The liquid container 4 is used to hold the liquid sample to be measured; the liquid container 4 is arranged between the light source module 1 and the signal processing module 3, and the signal transmission module 2 passes through the liquid container 4. The liquid container 4 is composed of an L-shaped partition with a length of 17 cm and a width of 8 cm arranged inside the shell 7; the shell 7 is made of acrylic material, and the upper end is a semi-open structure; the thickness of the shell 7 is 3 mm.

[0045] The signal processing module 3 is used to collect and amplify the optical signal passing through the liquid sample to be measured, and convert the optical signal into an electrical signal and transmit it to the microprocessor 5; the signal processing module 3 amplifies the electrical signal through the avalanche photodiode 11, and converts the optical signal into an electrical signal through the photoelectric IV conversion amplifier module 12; the photoelectric IV conversion amplifier module 12 is a YK-APD01AC photoelectric IV conversion amplifier module.

[0046] The microprocessor 5 is used to receive the electrical signal sent by the signal processing module 3 and calculate the temperature value of the liquid sample to be measured according to the voltage-temperature model; the microprocessor 5 is a single chip microcomputer 16; the single chip microcomputer 16 is a stm32F103C8T6 single chip microcomputer. The voltage-temperature model is: T=60.12×U-5.33 Among them, U is the voltage and T is the temperature of the liquid.

[0047] The display module 6 is used to display the temperature value of the liquid sample to be measured calculated by the microprocessor 5 .

[0048] The liquid container 4 and the microprocessor 5 are installed inside the housing 7 ; the light source module 1 is installed outside the housing 7 and connected to the signal transmission module 2 .

[0049] Example 3 A high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion, comprising: The light source module 1 is a laser pen 9, which is installed outside the housing 7 and connected to the signal transmission module 2 for transmitting signals. The output power of the laser pen 9 is 15 mW, which maintains the stability of the light source transmission.

[0050] The signal transmission module 2 is a single-mode optical fiber 10, which is used to transmit optical signals and is connected to the signal processing module 3. Its type is G.652D, and its insertion loss is 0.3dB, return loss 50dB, thereby reducing the loss when transmitting optical signals.

[0051] The signal processing module 3 is composed of an APD avalanche photodiode 11 and a YK-APD01AC photoelectric IV conversion amplifier. The APD avalanche photodiode 11 amplifies the electrical signal, and the YK-APD01AC photoelectric IV conversion amplifier module 12 converts the optical signal into an electrical signal.

[0052] The liquid container 4 is between the light source module 1 and the signal processing module 3 , and is an L-shaped partition with a length of 17 cm and a width of 8 cm provided inside the housing 7 , so that the liquid sample to be measured in temperature can be placed therein.

[0053] The microprocessor 5 is connected to the signal processing module 3, and its type is sm32F103C8T6 single chip microcomputer 16, which is fixed outside the housing 7, and is used to receive the electrical signal and calculate the temperature value of the liquid sample to be tested according to the voltage-temperature model. The voltage-temperature model is T=60.12×U-5.33; wherein U is the voltage and T is the temperature of the liquid.

[0054] The display module 6 is used to display the temperature calculated by the microprocessor 5 .

[0055] The outer shell 7 is made of acrylic material with a thickness of 3 mm, and has a strong integrated structure. The upper end is a semi-open structure, which can effectively reduce the heat loss in the liquid container 4 area and improve the accuracy of the temperature measured by the system.

[0056] The measuring system further comprises a power supply module 8 which is respectively connected to the signal processing module 3, the microprocessor 5 and the display module 6 for providing a working voltage.

[0057] The method of using the present invention is simple and easy to operate. The user only needs to pour the liquid sample of the temperature to be measured into the liquid container 4 to obtain its temperature value. It can realize long-distance transmission and record data, and can be applied to more complex environments, effectively solving the problem that the measurement results of mercury thermometers cannot be transmitted remotely, cannot be recorded, and are fragile. Real-time monitoring of temperature changes is realized.

[0058] See also Figure 1 Schematic diagram of optical fiber temperature measurement system; As can be seen from the figure, the high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion includes: light source module 1, signal transmission module 2, signal processing module 3, liquid container 4, microprocessor 5, display module 6, housing 7, power module 8; light source module 1, signal transmission module 2, and signal processing module 3 are on the same horizontal plane, and liquid container 4 is arranged between light source module 1 and signal processing module 3, signal transmission module 2 transmits optical signal to signal processing module 3, signal processing module 3 collects and amplifies optical signal of liquid samples immersed in different temperatures, and converts optical signal into electrical signal and transmits it to microprocessor 5, microprocessor 5 obtains temperature value of liquid sample to be measured according to voltage-temperature mathematical model, and displays it through display module 6. Signal transmission module 2, signal processing module 3, liquid container 4, microprocessor 5, power module 8 are all inside housing 7, while light source module 1 and display module 6 are outside housing 7. Power module 8 is connected to signal transmission module 2, signal processing module 3, microprocessor 5, and display module 6.

[0059] See also Figure 2The schematic diagram of the structure of the high-precision and low-power liquid temperature measurement system based on photoelectric conversion disclosed in the present invention; as can be seen from the figure, the laser pen 9 is used as a light source module 1 to emit a light signal, and the light signal is efficiently and low-loss transmitted to the avalanche photodiode 11 through the single-mode optical fiber 10. After receiving the light signal, the avalanche photodiode 11 converts it into an electrical signal; the photoelectric IV conversion amplifier module 12 amplifies and processes the electrical signal output by the avalanche photodiode 11 to ensure the accuracy and stability of the signal. At the same time, the photoelectric IV conversion amplifier module 12 obtains the working power from the DC adjustable power supply template 13; the DC adjustable power supply template 13 provides a stable DC power supply for the entire system to ensure that each module can work normally, and the lithium battery pack 14 is used as a backup or main power supply to power the OLED display screen 15 and the single-chip microcomputer 16; the OLED display screen 15 is used to intuitively display the temperature measurement results, and is connected to the single-chip microcomputer 16 through wires to receive and display the data processed by the single-chip microcomputer 16. The single-chip microcomputer 16, as the control core of the system, receives the electrical signal transmitted by the photoelectric IV conversion amplifier module 12, calculates the temperature value of the liquid sample to be measured according to the voltage-temperature model, and displays the temperature measurement result through the OLED display screen 15. At the same time, the single-chip microcomputer 16 also controls other modules to work together to ensure that the entire system can complete the liquid temperature measurement task efficiently and accurately. Through precise connection and synergy, each component jointly realizes the liquid temperature measurement function with high precision and low power consumption.

[0060] The method for using the high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion disclosed in Embodiment 3 of the present invention comprises the following steps: 1) Build the experimental device, first pass the single-mode optical fiber 10 through the liquid container 4, connect it to the signal processing module 3 (including the avalanche photodiode 11 and the photoelectric IV conversion amplifier 12), and then connect it to the signal processing module 3 (including the single-chip computer 16 and the OLED display screen 15), and place it inside the housing 7. Make sure that the light source module 1 is on the same horizontal plane as the signal transmission module 2 and the signal processing module 3; 2) placing the liquid container 4 of the system device on the heating plate, adding water at room temperature into the liquid container 4 and then covering it with a cover plate; 3) Turn on the power module 8, which is composed of a DC adjustable power template 13 and a lithium battery pack 14, to provide working voltage for the signal processing module 3, the microprocessor 5 and the display module 6; 4) Turn on the laser pointer 9 to allow it to provide a stable light source; 5) Use a thermometer to measure the water temperature and record the voltage value displayed on the OLED display screen 15 at this time; 6) Turn on the heating plate to heat the liquid. During the heating process, record the water temperature and the corresponding voltage reading every 5 seconds; 7) Repeat the above operation, measure multiple times to obtain multiple sets of data, and take the average value of the voltage value corresponding to the same temperature; 8) Repeat the steps to obtain voltage values ​​at multiple temperatures; 9) Use Origin to perform data fitting and curve fit the obtained relationship between temperature and voltage; 10) Write the fitted function into the microcontroller 16 program; 11) Use a mercury thermometer to measure the water temperature and compare it with the temperature result measured by the system device to obtain the device error; 12) If the error between the standard result and the measured result is too large, the voltage and temperature values ​​at this time are used as data, and the fitting is performed again, and the previous fitting curve is modified and rewritten into the microcontroller 16 program; 13) Measure and correct the curve multiple times to reduce device errors.

[0061] The high-precision, low-power liquid temperature measurement system based on photoelectric conversion disclosed in the present invention combines the advantages of optical and electronic technologies to achieve high-precision, real-time measurement of liquid temperature. The system monitors the change of liquid refractive index with temperature and then converts it into electrical signals for processing. It not only establishes a high-precision voltage-temperature mathematical model, but also significantly improves the accuracy and stability of the measurement. In addition, a low-power design is adopted to effectively extend the service life and reduce operating costs. In terms of operation, by optimizing the system layout and strict process control, the interference of external factors on the measurement, such as light leakage and temperature loss, is effectively avoided, ensuring the accuracy and reliability of the data. The temperature measurement system provides efficient, accurate and reliable temperature measurement solutions for scientific research, industry, medical care and other fields, and has broad application value and market prospects.

[0062] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A high-precision, low-power liquid temperature measurement system based on photoelectric conversion, characterized in that: include: A power module (8), used for providing a working voltage; A light source module (1), used for emitting a light signal; A signal transmission module (2) is used to transmit the light signal emitted by the light source module (1) to the liquid sample to be temperature measured; A liquid container (4) for containing a liquid sample to be temperature measured; A signal processing module (3) is used to collect and amplify the optical signal passing through the liquid sample to be measured, and convert the optical signal into an electrical signal and transmit it to the microprocessor (5); A microprocessor (5) is used to receive the electrical signal sent by the signal processing module (3) and calculate the temperature value of the liquid sample to be measured according to a voltage-temperature model; The display module (6) is used to display the temperature value of the liquid sample to be measured calculated by the microprocessor (5).

2. According to claim 1, the high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion is characterized in that: The power module (8) is composed of a DC adjustable power template (13) and a lithium battery pack (14); The liquid container (4) is arranged between the light source module (1) and the signal processing module (3), and the signal transmission module (2) passes through the liquid container (4).

3. The high-precision, low-power consumption liquid temperature measurement system based on photoelectric conversion according to claim 1 is characterized in that: The liquid container (4) and the microprocessor (5) are installed inside the housing (7); the light source module (1) is installed outside the housing (7) and is connected to the signal transmission module (2).

4. The high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion according to claim 1 is characterized in that: The light source module (1) is a laser pen (9), and the output power of the laser pen (9) is 15 mW.

5. The high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion according to claim 1 is characterized in that: The signal transmission module (2) is a single-mode optical fiber (10); the type of the signal transmission module (2) is G.652D; the insertion loss of the signal transmission module (2) is 0.3dB, return loss 50dB.

6. The high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion according to claim 1 is characterized in that: The signal processing module (3) amplifies the electrical signal through an avalanche photodiode (11), and converts the optical signal into an electrical signal through a photoelectric IV conversion amplifier module (12); the photoelectric IV conversion amplifier module (12) is a YK-APD01AC photoelectric IV conversion amplifier module.

7. The high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion according to claim 1 is characterized in that: The microprocessor (5) is a single-chip microcomputer (16); the single-chip microcomputer (16) is a stm32F103C8T6 single-chip microcomputer.

8. The high-precision, low-power consumption liquid temperature measurement system based on photoelectric conversion according to claim 1 is characterized in that: The liquid container is composed of an L-shaped partition with a length of 17 cm and a width of 8 cm arranged inside the outer shell (7); the outer shell (7) is made of acrylic material and has a semi-open structure at the upper end; the thickness of the outer shell (7) is 3 mm.

9. The high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion according to claim 1 is characterized in that: The voltage-temperature model is: T=60.12×U-5.33 Among them, U is the voltage and T is the temperature of the liquid.

10. The method for using the high-precision and low-power consumption liquid temperature measurement system based on photoelectric conversion according to any one of claims 1 to 9, characterized in that: The following steps are involved: 1) The power supply is turned on, the power supply module (8) provides the operating voltage, and the signal processing module (3), the microprocessor (5) and the display module (6) are automatically started; 2) Turning on the light source module (1), adding a liquid sample of the temperature to be measured into the liquid container (4); the light signal emitted by the light source module (1) is transmitted to the liquid sample of the temperature to be measured via the signal transmission module (2), and then transmitted to the signal processing module (3) via the liquid sample of the temperature to be measured; the signal processing module (3) amplifies the light signal passing through the liquid sample of the temperature to be measured, converts it into an electrical signal, and transmits it to the microprocessor (5); 3) The microprocessor (5) receives the electrical signal sent by the signal processing module (3) and calculates the temperature value of the liquid sample to be measured according to the voltage-temperature model; 4) Observe the temperature value of the liquid sample to be measured calculated by the microprocessor (5) through the display module (6), and obtain the temperature of the liquid sample to be measured after the reading stabilizes.

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