Rapid regulation and control infrared narrow-band thermal radiation light source based on temperature feedback and control method

Abstract

The invention relates to the technical field of infrared light sources, in particular to a rapid regulation and control infrared narrow-band thermal radiation light source based on temperature feedback and a control method. The light source comprises a heating layer, a light source cavity and a control circuit; the heating layer comprises a heating coil, the width of the heating coil is increased from the center area to the edge area, and the interval of the heating coil is increased from the center area to the edge area. The heating layer is made of a platinum material, and the platinum electrode monitors the temperature of the heating layer in real time through resistance temperature change characteristics; the light source cavity is used for accommodating a heating electrode and an optical filter and guiding generated infrared radiation to a required direction; the optical filter is used for selectively filtering light with a specific wavelength to realize infrared narrow-band light output; the control circuit is used for adjusting heating output power in real time according to the temperature of the heating layer. According to the technical scheme, the system structure can be simplified, and efficient power regulation and control and accurate temperature feedback control are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of infrared light sources, and in particular to a fast-controlled infrared narrow-band thermal radiation light source and a control method based on temperature feedback. Background Art

[0002] As an important optical device, infrared narrowband thermal radiation light source has shown broad application prospects in many fields such as gas detection and environmental monitoring. Its working principle is mainly based on the interaction between infrared light of a specific wavelength and gas molecules. By measuring the absorption, reflection or transmission characteristics of infrared light, accurate detection of gas concentration can be achieved. Although infrared narrowband thermal radiation light source has many advantages, there are still some problems with existing light source equipment.

[0003] First, the slow response speed of power regulation is a significant problem of existing infrared light sources. In situations where the output power of the light source needs to be adjusted quickly, such as real-time monitoring of gas concentration changes, the slow response speed may cause a lag in the detection results, thus affecting the accuracy and timeliness of the detection.

[0004] Secondly, low temperature control accuracy is also a key factor restricting the performance improvement of existing infrared light sources. The operating temperature of an infrared light source has an important influence on its radiation characteristics and stability. However, existing temperature control usually relies on external sensors. This control method not only increases the complexity of the system, but may also lead to insufficient temperature control accuracy, which in turn affects the radiation performance and stability of the light source.

[0005] In addition, the high system complexity is also a significant drawback of existing infrared light source equipment. Since additional temperature sensors and complex control circuits are required to achieve temperature monitoring and power regulation, the size and cost of existing light source equipment are often large, which is not conducive to the miniaturization and integration of the equipment. Summary of the invention

[0006] The purpose of the present invention is to propose a fast-controlled infrared narrow-band thermal radiation light source and a control method based on temperature feedback. This technical solution can simplify the system structure and achieve efficient power regulation and precise temperature feedback control.

[0007] To achieve the above objectives, in a first aspect, the embodiments of the present disclosure provide a fast-controlled infrared narrow-band thermal radiation light source based on temperature feedback, comprising a heating layer, a light source cavity and a control circuit; The heating layer includes a heating coil, the width of which changes from narrow to wide from the center area to the edge area, and the spacing of which changes from small to large from the center area to the edge area; the heating layer is made of platinum material, and the platinum electrode monitors the temperature of the heating layer in real time through the resistance temperature change characteristic; The light source cavity is used to accommodate the heating electrode and the filter, and guide the generated infrared radiation to the desired direction; the filter is used to selectively filter out light of a specific wavelength to achieve infrared narrow-band light output; The control circuit is used to adjust the heating output power in real time according to the temperature of the heating layer.

[0008] Beneficial effects of the basic solution: The width of the heating coils in the heating layer of the present application changes from narrow to wide from the center area to the edge area, and the intervals also change accordingly, which helps to quickly heat up the center area, improve the heat transfer efficiency, shorten the heating time, and ensure the temperature stability and uniform distribution in the edge area, and prevent uneven heating caused by excessive temperature gradients. Heating coils with a larger width can generate heat stably in the edge area, maintain temperature uniformity, optimize the overall heat distribution, and achieve more uniform heat distribution and faster thermal response speed. When the control circuit receives a signal that requires power adjustment, it can quickly change the current or voltage of the heating layer, thereby achieving rapid regulation of the output power.

[0009] The heating layer is made of platinum material, and the temperature of the heating layer is monitored in real time by using the resistance-temperature change characteristics of platinum. As a high-precision and high-stability temperature measurement material, platinum can ensure the accuracy of temperature monitoring. The control circuit can accurately adjust the power output of the heating layer based on the temperature information monitored in real time to keep the light source running stably within the set temperature range, thereby improving the temperature control accuracy.

[0010] This technical solution does not require the use of external filters, further reducing the system size and improving the integration, simplifying the system structure. Due to the realization of fast power regulation and precise temperature control, this technical solution can significantly improve the stability and reliability of the system. The fast response power regulation helps to respond to external environmental changes or load fluctuations in a timely manner, while precise temperature control can ensure the performance consistency of the light source during long-term operation.

[0011] The infrared narrow-band thermal radiation light source of this technical solution has the advantages of fast response, high-precision temperature control and compact structure, making it applicable to more fields. For example, in gas detection and environmental monitoring, it can realize real-time monitoring and accurate measurement of gas concentration; in the medical field, it can be used for infrared thermal imaging and diagnosis.

[0012] As an implementable preferred solution, it also includes a substrate, which serves as the bottom support of the entire structure and the installation basis of other components, and is made of an aluminum substrate; a welding pad is set at the bottom or side of the substrate and is connected to the heating electrode through a lead wire.

[0013] As an implementable preferred solution, it also includes a substrate, which is fixed on the base plate and is used to provide stable mechanical support for the supporting layer and the heating layer.

[0014] As an implementable preferred solution, it also includes a support layer, which is located between the substrate and the heating layer, and is used to provide support for the heating layer, while also playing the role of thermal insulation and electrical insulation.

[0015] As an implementable preferred solution, the control circuit adjusts the output power of the heating layer through PWM control and PID feedback algorithm.

[0016] In a second aspect, the embodiments of the present disclosure provide a control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback, comprising: The initial power is set by the control circuit to heat the heating layer to the set temperature; The temperature signal is collected in real time through the platinum electrode, and its resistance temperature coefficient is used to monitor the temperature and feedback it to the control circuit; The control circuit adjusts the power output of the heating layer according to the temperature feedback signal; According to the external environment and detection requirements, dynamic power output is achieved by adjusting the feedback control parameters.

[0017] Beneficial effects: Through improved control algorithms and fuzzy logic control strategies, this technical solution can meet high-demand application scenarios. By collecting temperature signals in real time through platinum electrodes and using their resistance temperature coefficient for monitoring, accurate measurement of the temperature of the heating layer can be achieved. The control circuit adjusts the power output of the heating layer in real time according to the temperature feedback signal. The instant feedback mechanism enables the system to respond quickly to temperature changes and make timely adjustments to maintain the stability of the set temperature. It can adjust the feedback control parameters according to the external environment and detection requirements to achieve dynamic power output. It can be flexibly adjusted according to different working environments and actual needs, which improves the adaptability and flexibility of the system. Through precise temperature control and rapid response mechanisms, it is ensured that the infrared narrow-band thermal radiation light source operates in a stable working state, thereby improving the luminous efficiency and stability of the light source, thereby improving the reliability of the light source and extending its service life.

[0018] As an implementable preferred solution, the initial power is set by the control circuit to heat the heating layer to the set temperature, including the following contents: Set target temperature , initialize the historical temperature value , set the temperature change rate , initialize PID parameters; convert the power command into an analog signal, apply it to the platinum heating layer through the power drive circuit, start the heating process, and preheat the heating layer to the set temperature range.

[0019] As an implementable preferred solution, the temperature signal is collected in real time through the platinum electrode, and the temperature is monitored by using its resistance temperature coefficient, and fed back to the control circuit, which specifically includes the following contents: Use its resistance temperature coefficient to obtain the current temperature value ; Temperature error The calculation formula is as follows: ; Error change rate The calculation formula is as follows: .

[0020] As an implementable preferred solution, the control circuit adjusts the power output of the heating layer according to the temperature feedback signal, including the following contents: Perform fuzzy processing; Error e Categorize: | e | ≤ 1℃ is low error, 1℃<| e | ≤ 5℃ is the mean error, | e |> 5℃ is a high error; Error change rate ec To classify: ec <-0.5℃ / s is negative change, -0.5℃ / s ≤ ec ≤ 0.5℃ / s means no change. ec >0.5℃ / s is a positive change; Define the fuzzy rule base, obtain the increase and decrease coefficient according to the temperature error and change rate, and use the increase and decrease coefficient to calculate the correction k p 、k i 、k d Three parameters, the specific formula is as follows:

[0021]

[0022]

[0023] in, k p 、k i 、k d are the proportional, integral, and differential coefficients respectively.

[0024] As an implementable preferred solution, according to the adjusted k p 、k i 、k d Parameters, real-time calculation of PID controller output , thereby adjusting the power output of the heating layer , the formula is as follows:

[0025] according to The value of PWM output is calculated , the formula is as follows:

[0026] Continuously monitor temperature and update PID control parameters in real time, including the minimum voltage value and maximum voltage Calculated through testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of a rapidly controlled infrared narrow-band thermal radiation light source based on temperature feedback.

[0028] Figure 2 It is a schematic diagram of the structure of the heating layer.

[0029] Figure 3 It is a structural diagram of the control circuit. DETAILED DESCRIPTION

[0030] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings. It will be understood that the specific embodiments described herein are only partial embodiments of the present invention, which are only used to explain the present application, rather than to limit the present application. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered isolated, and they can be combined with each other to achieve better technical effects. The same reference numerals appearing in the drawings of the following embodiments represent the same features or components, which can be applied to different embodiments.

[0031] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of the present invention should have the common meanings understood by those skilled in the art in the art to which the present invention belongs.

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings: Reference numerals: substrate 1 , underlay 2 , support layer 3 , heating layer 4 , light source cavity 5 .

[0033] Reference Figure 1 A fast-controlled infrared narrow-band thermal radiation light source based on temperature feedback includes a substrate 1, a substrate 2, a support layer 3, a heating layer 4, a light source cavity 5, a filter and a control circuit.

[0034] The substrate 1 is used as the bottom support of the entire structure and the installation basis of other components. It is made of an aluminum substrate 1 with high thermal conductivity and high mechanical strength. The aluminum substrate 1 has excellent heat dissipation performance and can effectively prevent deformation of the substrate 1 and changes in material properties caused by heat. A pad is set at the bottom or side of the substrate 1, which is connected to the heating electrode through a lead wire to achieve the transmission of electrical energy.

[0035] The substrate 2 is fixed on the base plate 1 to provide stable mechanical support for the support layer 3 and the heating layer 4. In this embodiment, the substrate 2 material preferably adopts high-resistance, high-insulation silicon oxide or silicon nitride, which can maintain stable electrical insulation under high temperature conditions to ensure the electrical safety of the entire structure.

[0036] The support layer 3 is located between the substrate 2 and the heating layer 4, and is used to provide support for the heating layer 4, and also plays the role of heat insulation and electrical insulation. The material of the support layer 3 is preferably silicon oxide or aluminum oxide, and its thickness is preferably 100nm~500nm, so as to ensure good heat insulation performance and avoid the increase of thermal resistance caused by excessive thickness.

[0037] The heating layer 4 is located above the supporting layer 3 and is used to achieve heating and temperature measurement. The heating layer 4 is preferably made of platinum material, which can convert electrical energy into thermal energy, and can also realize temperature acquisition through its temperature-dependent resistance change, forming a cantilever structure of 0.5μm~2μm. Platinum not only has efficient heating ability, but also can realize temperature acquisition through its temperature-dependent resistance change. By precisely controlling the thickness and structure of platinum, it can ensure that it works stably at high temperatures and has a good resistance temperature coefficient (RTD characteristic), thereby achieving accurate temperature measurement and control.

[0038] In one embodiment, the heating layer 4 includes a heating coil, referring to Figure 2 , whose width and spacing gradually change from the center to the edge (refer to Figure 2 ③ to ①). In the central area, the heating coil width is narrow (such as 5μm) and the spacing is small (such as 2μm) to achieve rapid heating and improve heat transfer efficiency. In the edge area, the heating coil width is wide (such as 20μm) and the spacing is large (such as 10μm) to ensure stable and uniform temperature distribution. This gradient heating coil design not only improves the heating speed of the heating plate, but also ensures the uniformity of temperature, effectively improving the performance of the infrared narrow-band thermal radiation light source, thereby improving the uniformity of heat distribution and the speed of temperature rise and fall.

[0039] The light source cavity 5 is used to accommodate the heating electrode and the filter, and guide the generated infrared radiation to the desired direction. In this embodiment, the light source cavity 5 is made of quartz glass, which has the characteristics of high temperature resistance and low thermal expansion coefficient, and can maintain optical performance and mechanical strength in a high temperature environment.

[0040] The filter is used to achieve infrared narrowband light output. In this embodiment, the filter preferably uses a metamaterial absorber, which can selectively filter out light of a specific wavelength without the need for an external filter, further reducing the system volume and improving the integration. The metamaterial absorber is composed of a metal / dielectric composite structure, the metal layer thickness is preferably 30nm~200nm, the dielectric layer thickness is preferably 50nm~300nm, and can achieve narrowband infrared radiation output near 3μm, and the spectral bandwidth is preferably 10nm~20nm.

[0041] Reference Figure 3 The control circuit adjusts the output power of the heating layer 4 through PWM control and PID feedback algorithm to achieve fast and accurate temperature control.

[0042] A control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback is as follows: Step S100, performing initialization settings, specifically including: Turn on the power, start the control circuit, and set the parameter values ​​through the control circuit. The parameter values ​​are preset according to the specific application scenario. Set the target temperature , initialize the historical temperature value , set the temperature change rate , initialize the PID parameters. In this embodiment, the PID parameters are set to k p =3、k i= 0.14、k d =6 .

[0043] The power command is converted into an analog signal and applied to the platinum heating layer through a power driving circuit to start the heating process, so that the heating layer is preheated to a set temperature range, preferably 200°C to 600°C.

[0044] Step S200, performing temperature collection and feedback control, specifically includes: During the heating process, the resistance value of the platinum heating layer 4 increases with the temperature. The temperature signal is collected in real time through the platinum electrode, and the current temperature value is obtained by using its resistance temperature coefficient (RTD effect). , and fed back to the control circuit. Temperature changes cause changes in the resistance of the platinum layer, and the control circuit collects resistance signals in real time to accurately adjust the power output. The response time of the feedback system is preferably less than 10ms to ensure fast and stable temperature control.

[0045] Temperature error The calculation formula is as follows: .

[0046] Error change rate The calculation formula is as follows: .

[0047] Step S300, performing rapid power regulation through a control circuit, specifically includes: The control circuit adjusts the power output of the heating layer 4 according to the temperature feedback signal to ensure that the infrared radiation intensity is stable within the set range. The power adjustment range is preferably 0% to 100%, and the adjustment time is less than 50ms to meet the needs of different detection environments.

[0048] According to the external environment and detection requirements, dynamic power output is achieved by adjusting the feedback control parameters. The PID (proportional-integral-differential) control algorithm is preferably used to achieve rapid response and precise control of different gas concentrations and ambient temperatures.

[0049] The specific contents include the following: Fuzzy processing is performed to e Divided into: low error (| e | ≤ 1℃), mean error (1℃<| e | ≤ 5℃), high error (| e |> 5℃); Error change rate ec Divided into: negative change ( ec <-0.5℃ / s), no change (-0.5℃ / s ≤ ec ≤0.5℃ / s), positive change( ec >0.5℃ / s).

[0050] Define the fuzzy rule base, adjust the system response according to the temperature error and the rate of change, and set the fuzzy rule table of the proportional coefficient, see Table 1.

[0051] Table 1

[0052] The adjustment amount can be increased or decreased by a factor To define, among which, the significant increase is ; A slight increase of ; significantly reduced to ; slightly reduced to .

[0053] Calculate and correct the conclusions based on the fuzzy rule base k p 、k i 、k d Three parameters, the specific formula is as follows:

[0054]

[0055]

[0056] in, k p 、k i 、k d are the proportional, integral, and differential coefficients respectively.

[0057] According to the adjusted k p 、k i 、k d Parameters, real-time calculation of PID controller output , thereby adjusting the power output of the heating layer 4 , the formula is as follows:

[0058] according to The value of PWM output is calculated and tested = -3.6, =1200, the formula is as follows:

[0059] Continuously monitor the temperature and update the PID control parameters in real time to form a closed-loop control system to achieve continuous and stable infrared narrow-band thermal radiation output.

[0060] Those of ordinary skill in the art can understand that all or part of the process of implementing a control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback can be completed by instructing related hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the process of each embodiment of a control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0061] The above contents are only embodiments of the present invention. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known control methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A fast-controlled infrared narrow-band thermal radiation light source based on temperature feedback, characterized in that: It includes a heating layer, a light source cavity and a control circuit; The heating layer includes a heating coil, the width of which changes from narrow to wide from the center area to the edge area, and the spacing of which changes from small to large from the center area to the edge area; the heating layer is made of platinum material, and the platinum electrode monitors the temperature of the heating layer in real time through the resistance temperature change characteristic; The light source cavity is used to accommodate the heating electrode and the filter, and guide the generated infrared radiation to the desired direction; the filter is used to selectively filter out light of a specific wavelength to achieve infrared narrow-band light output; The control circuit is used to adjust the heating output power in real time according to the temperature of the heating layer.

2. The fast-controlled infrared narrow-band thermal radiation light source based on temperature feedback according to claim 1, characterized in that: It also includes a substrate, which serves as the bottom support of the entire structure and the installation basis of other components, and is made of an aluminum substrate; a welding pad is set at the bottom or side of the substrate and is connected to the heating electrode through a lead wire.

3. The fast-controlled infrared narrow-band thermal radiation light source based on temperature feedback according to claim 2, characterized in that: It also includes a substrate, which is fixed on the base plate and is used to provide stable mechanical support for the supporting layer and the heating layer.

4. The fast-controlled infrared narrow-band thermal radiation light source based on temperature feedback according to claim 3 is characterized in that: It also includes a support layer, which is located between the substrate and the heating layer and is used to provide support for the heating layer and also plays a role of thermal insulation and electrical insulation.

5. The fast-controlled infrared narrow-band thermal radiation light source based on temperature feedback according to claim 1 or 4, characterized in that: The control circuit adjusts the output power of the heating layer through PWM control and PID feedback algorithm.

6. A control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback, characterized in that: include: The initial power is set by the control circuit to heat the heating layer to the set temperature; The temperature signal is collected in real time through the platinum electrode, and its resistance temperature coefficient is used to monitor the temperature and feedback it to the control circuit; The control circuit adjusts the power output of the heating layer according to the temperature feedback signal; According to the external environment and detection requirements, dynamic power output is achieved by adjusting the feedback control parameters.

7. The control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback according to claim 6 is characterized in that: The initial power is set by the control circuit to heat the heating layer to the set temperature, including the following: Set target temperature , initialize the historical temperature value , set the temperature change rate , initialize PID parameters; convert the power command into an analog signal, apply it to the platinum heating layer through the power drive circuit, start the heating process, and preheat the heating layer to the set temperature range.

8. The control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback according to claim 7, characterized in that: The temperature signal is collected in real time through the platinum electrode, and its resistance temperature coefficient is used to monitor the temperature and feedback to the control circuit, which includes the following: Use its resistance temperature coefficient to obtain the current temperature value ; Temperature error The calculation formula is as follows: ； Error change rate The calculation formula is as follows: 。 9. The control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback according to claim 8, characterized in that: The control circuit adjusts the power output of the heating layer according to the temperature feedback signal, including the following: Perform fuzzy processing; Error e Categorize: | e | ≤ 1℃ is low error, 1℃ < | e | ≤ 5℃ is the mean error, | e |> 5℃ is a high error; Error change rate ec To classify: ec < -0.5℃ / s is negative change, -0.5℃ / s ≤ ec ≤ 0.5℃ / s means no change. ec > 0.5℃ / s is a positive change; Define the fuzzy rule base, obtain the increase and decrease coefficient according to the temperature error and change rate, and use the increase and decrease coefficient to calculate the correction k p 、 k i 、k d Three parameters, the specific formula is as follows: in, k p 、k i 、k d are the proportional, integral, and differential coefficients respectively.

10. The control method for rapidly regulating an infrared narrow-band thermal radiation light source based on temperature feedback according to claim 9, characterized in that: According to the adjusted k p 、k i 、k d Parameters, real-time calculation of PID controller output , thereby adjusting the power output of the heating layer , the formula is as follows: according to The value of PWM output is calculated , the formula is as follows: Continuously monitor temperature and update PID control parameters in real time, including the minimum voltage value and maximum voltage Calculated through testing.

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