Temperature-controllable laser heating device and heating method

Abstract

The invention discloses a temperature-controllable laser heating device and method, and relates to the technical field of laser heating, and the device comprises a laser generator which is used for generating a laser beam for heating; the triangular prism assembly is arranged on the same side of the laser generator and the detection control module and is used for refracting the laser beams to irradiate the power equipment for heating and refracting infrared radiation generated by the power equipment to irradiate the detection control module; the detection control module is used for detecting the infrared radiation so as to obtain the actual temperature of the heating point of the power equipment, and adjusting the output power of the laser generator based on the actual temperature and the preset temperature so as to control the deviation between the preset temperature and the actual temperature; the laser beam is refracted to irradiate the power equipment for heating, the actual temperature of the heating point is obtained, the output power of the laser generator is adjusted based on the actual temperature and the preset temperature, the device can be used without modification, and the problems of randomness of training content and concealment of examination content are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser heating, in particular to a controllable temperature laser heating device and a heating method. BACKGROUND

[0002] In order to carry out infrared thermal imaging technology training, it is necessary to set up a power equipment heating defect simulation device on a training high-voltage electrical equipment without electricity to realize heating defect simulation.

[0003] The current power equipment heating defect simulation device mainly includes a power equipment heating defect simulation device based on a heat source and a power equipment heating defect simulation device based on a temperature control heating film. For the former, the deployment of the heat source needs to be customized to adapt to various types of power equipment, and the modification workload is large. Moreover, the equipment modified through the cavity is difficult to undertake other types of training tasks, causing waste of equipment resources. For the latter, the heating film is easy to be identified at the deployment position due to the special material form, and it is difficult to solve the randomness of the training content and the concealment of the examination content. SUMMARY

[0004] In order to solve the technical problems of the need for customization to adapt to various types of power equipment and the easy-to-identify deployment position in the prior art, the present application provides a controllable temperature laser heating device and a heating method.

[0005] The present application adopts the following technical solutions.

[0006] The first aspect of the present application provides a controllable temperature laser heating device, comprising:

[0007] A laser generator for generating a heating laser beam;

[0008] A triangular prism assembly disposed on the same side of the laser generator and the detection control module for refracting the laser beam to irradiate the power equipment for heating and refracting the infrared radiation generated by the power equipment to irradiate the detection control module;

[0009] A detection control module for detecting the infrared radiation to obtain the actual temperature of the heating point of the power equipment, and adjusting the output power of the laser generator based on the actual temperature and the preset temperature to control the deviation between the preset temperature and the actual temperature.

[0010] Preferably, the triangular prism assembly comprises at least one triangular prism made of an optical material with a dispersion coefficient greater than 0.03 / nm.

[0011] Preferably, the detection control module comprises:

[0012] An infrared thermal imaging sensor for detecting the infrared radiation and sending the infrared thermal imaging signal to the temperature control module,

[0013] a temperature control module, configured to convert the infrared thermal imaging signal into an actual temperature, and control the power of the laser generator based on the actual temperature and a preset temperature.

[0014] Preferably, the infrared thermal imaging sensor comprises a narrow-band filter, and a transmission band of the narrow-band filter is matched with a characteristic radiation wavelength of the power equipment.

[0015] Preferably, the temperature control module comprises:

[0016] a signal processing unit, configured to convert the infrared thermal imaging signal into an actual temperature;

[0017] a controller, configured to calculate a deviation between the preset temperature and the actual temperature, and generate a control signal based on the deviation;

[0018] a power adjusting circuit, configured to adjust the output power of the laser generator based on the control signal.

[0019] Preferably, the detection control module detects a sampling frequency that is not less than five times of an output power adjusting frequency of the laser generator.

[0020] A second aspect of the present application provides a heating method, which is realized based on the controllable temperature laser heating device of the first aspect, and comprises:

[0021] refracting the laser beam to irradiate the power equipment for heating;

[0022] detecting the refracted infrared radiation generated by the heating point of the power equipment to obtain an actual temperature of the heating point of the power equipment;

[0023] adjusting the laser based on the actual temperature and the preset temperature to control a deviation between the preset temperature and the actual temperature.

[0024] Compared with the prior art, the present application has the beneficial effects that,

[0025] The laser beam generated by the laser generator is refracted by the three-prism assembly to irradiate the power equipment for heating, the infrared radiation refracted by the three-prism assembly is detected by the detection control module to obtain the actual temperature of the heating point of the power equipment, and the output power of the laser generator is adjusted based on the actual temperature and the preset temperature to control the deviation between the preset temperature and the actual temperature, thereby meeting the requirements of infrared thermal imaging technology training, and the device can be used without modification for different power equipment, has high use efficiency, and has no direct installation on the power equipment, so that the heating light path and the detection light path are invisible to the naked eye, the position of the heating point can be selected as needed, and the randomness of training content and the concealment of examination content can be solved, thereby having good use effect. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a controllable temperature laser heating device according to the present invention.

[0027] 1. Laser generator; 2. Prism assembly; 3. Power equipment; 4. Infrared thermal imaging sensor; 5. Temperature control module; 6. Heating optical path; 7. Detection optical path; 8. First refractive surface; 9. Second refractive surface. Detailed Implementation

[0028] 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 of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0030] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0034] like Figure 1 As shown, Embodiment 1 of the present invention provides a controllable temperature laser heating device, which is fixed on a three-dimensional motion platform during use. The position of the power equipment 3 and the heating point is selected by rotating the three-dimensional motion platform. The present invention achieves simultaneous heating and detection through optical path separation design, accurately, continuously and in real time obtaining the temperature of the heating point during laser heating, realizing real-time control of laser heating temperature. It has the advantages of fast temperature response, high measurement accuracy and compact system structure. The device includes:

[0035] Laser generator 1, used to generate a laser beam for heating;

[0036] a three-prism assembly 2, disposed at the same side of the laser generator and the detection control module, for refracting the laser beam to irradiate the power device 3 for heating, and refracting the infrared radiation generated by the power device 3 to irradiate the detection control module;

[0037] the detection control module, for detecting the infrared radiation to obtain the actual temperature of the heating spot of the power device 3, and adjusting the output power of the laser generator 1 based on the actual temperature and the preset temperature to control the deviation between the preset temperature and the actual temperature.

[0038] Preferably but not limitedly, the laser generator 1 comprises a pump source (energy input), a gain medium (laser working substance), an optical resonant cavity (feedback and mode selection), an output coupler (laser output), and an auxiliary control system (such as power supply, cooling, control circuit, etc.), which is a complete and independent device capable of emitting heating required laser.

[0039] The laser generator 1 is arranged near the first refractive surface 8 of the three-prism assembly 2, the laser beam emitted by the laser generator 1 is parallel to the main section of the three-prism, and the incident angle i1 between the laser beam and the first refractive surface 8 satisfies that the incident angle i2 between the laser beam and the second refractive surface 9 after the laser beam enters the three-prism assembly 2 through the first refractive surface 8 is less than the critical angle of the prism assembly material, so as to ensure that the laser beam can be refracted through the second refractive surface 9 after entering the three-prism assembly 2 through the first refractive surface 8, and the total reflection does not occur, and the specific angle of the incident angle i1 is determined according to the wavelength of the selected laser generator 1 and the material used in the three-prism assembly 2.

[0040] The laser emitter adopts a fiber-coupled semiconductor laser, and preferably, the wavelength λ1 is 980 nm, the maximum output power is 500 W, and it is continuously adjustable.

[0041] Preferably but not limitedly, the three-prism assembly 2 comprises at least one three-prism, and the three-prism is made of an optical material with a dispersion coefficient greater than 0.03 / nm, preferably calcium fluoride crystal or flint glass.

[0042] The three-prism assembly 2 is a prism assembly independent of the laser generator 1, rather than a prism assembly in the optical elements of the optical resonant cavity in the laser generator 1, and the three-prism assembly 2 can change the direction of the laser beam emitted by the laser generator 1 and irradiating on the first refractive surface 8 of the three-prism assembly 2, and change the direction of the infrared radiation generated by the heating spot of the power device 3 and irradiating on the second refractive surface 9 of the three-prism assembly 2.

[0043] The incident surface of the three-prism assembly 2 is coated with an anti-reflection film, and preferably, the thickness of the anti-reflection film is 980 nm, the reflectivity is less than 0.5%, and the top angle α of the three-prism is 60°.

[0044] Preferably but not limitedly, the detection control module comprises:

[0045] an infrared thermal imaging sensor 4 for detecting infrared radiation and sending an infrared thermal imaging signal to the temperature control module 5,

[0046] a temperature control module 5 for converting the infrared thermal imaging signal into an actual temperature, and controlling the power of the laser generator 1 based on the actual temperature and a preset temperature.

[0047] Further preferably but not limitedly, the infrared thermal imaging sensor 4 comprises a narrow-band filter, the transmission band of which is matched with the characteristic radiation wavelength of the power equipment 3.

[0048] The infrared thermal imaging sensor 4 is preferably a refrigeration-type indium antimonide (InSb) detector, with a response band of 3-5 μm and a frame rate of 200 Hz. A narrow-band filter is installed at the front end of the infrared thermal imaging sensor 4. Preferably, the center wavelength of the infrared thermal imaging sensor 4 is 4.3 μm, and the bandwidth is ±0.2 μm.

[0049] Further preferably but not limitedly, the temperature control module 5 comprises:

[0050] a signal processing unit for converting the infrared thermal imaging signal into an actual temperature;

[0051] a controller, preferably a PID controller, for calculating the deviation between the preset temperature and the actual temperature, and generating a control signal based on the deviation. Preferably, the sampling period of the controller is 5 ms;

[0052] a power regulation circuit, preferably a PWM laser drive circuit, for adjusting the output power of the laser generator 1 based on the control signal.

[0053] The detection control module and the laser generator 1 are also arranged near the first refracting surface 8 on one side of the three-prism assembly 2. The position and angle of the detection control module satisfy the condition that it can detect the infrared radiation generated by the heated spot of the power equipment 3 after being refracted twice by the three-prism assembly 2.

[0054] Preferably but not limitedly, the detection sampling frequency of the detection control module is not less than five times the output power regulation frequency of the laser generator 1.

[0055] The device further comprises a collimator. In combination with the example, the optical path configuration of the device is as follows:

[0056] Laser incidence path: the laser beam is collimated by a collimator (beam divergence angle <1 mrad) to form a heating light path 6 with a certain diameter, and is incident on the first refractive surface 8 of the three-prism assembly 2 at an incidence angle i1=45°, and then is refracted twice by the second refractive surface 9 (refraction angle r2≈28.5°), and is focused on the surface of the power equipment 3 to form a heating spot.

[0057] Infrared detection path: the power equipment 3 generates infrared radiation (λ2=3-5 μm) when heated, which is transmitted to the three-prism assembly 2 in reverse, and is incident on the second refractive surface 9 of the three-prism assembly 2 at an incidence angle r2≈28.5°, and is refracted twice by the first refractive surface 8 due to the dispersion effect, and is emitted at a refraction angle r3=25.9°, forming a detection light path 7 with an included angle θ of 2.6° with the laser incidence direction, and the included angle θ is determined by the refractive index difference between the laser wavelength λ1 and the infrared radiation wavelength λ2.

[0058] Embodiment 2 of the present application provides a heating method, which is realized based on the controllable temperature laser heating device provided in embodiment 1, and comprises the following steps:

[0059] Refracting the laser beam to irradiate the power equipment 3 for heating;

[0060] Detecting the refracted infrared radiation generated by the heating spot of the power equipment 3 to obtain the actual temperature of the heating spot of the power equipment 3;

[0061] Adjusting the laser based on the actual temperature and the preset temperature to control the deviation between the preset temperature and the actual temperature.

[0062] The heating method will be described below in combination with examples:

[0063] Temperature calibration: a blackbody radiation source (temperature range 100-800℃) is used to calibrate the infrared thermal imaging sensor 4, and a radiation intensity-temperature lookup table is established.

[0064] Closed loop control: the user sets a preset temperature T_set (such as 100 DEG C) through the temperature control module 5 and starts, the laser generator 1 starts heating, the infrared thermal imaging sensor 4 collects the actual temperature T_actual of the heating point of the power equipment 3 in real time, the controller calculates the deviation ΔT of the preset temperature T_set and the actual temperature T_actual, and the power regulation circuit adjusts the output power (adjustment range 10-500W) of the laser generator 1 based on ΔT proportionally until ΔT≤±0.5 DEG C (the specific deviation is determined by the infrared thermal imaging sensor 4 accuracy and the sampling period of the controller, and the same below) The output power of the laser generator 1 is reduced to 0, but the infrared thermal imaging sensor 4 still collects the actual temperature T_actual of the heating point of the power equipment 3 in real time, and when ΔT>1 DEG C, the output power of the laser generator 1 is adjusted again (adjustment range 10-20W) to heat, until ΔT≤±0.5 DEG C, the laser generator 1 is intermittently started to heat, so that the actual temperature of the heating point is maintained within the range of preset temperature T_set±1 DEG C.

[0065] Compared with the prior art, the beneficial effects of the present application are that,

[0066] The laser beam generated by the laser generator is refracted by the three-prism assembly to irradiate the power equipment for heating, the actual temperature of the heating point of the power equipment is obtained by detecting the infrared radiation after the three-prism assembly refraction through the detection control module, and the output power of the laser generator is adjusted based on the actual temperature and the preset temperature, so as to control the deviation between the preset temperature and the actual temperature, meet the requirements of infrared thermal imaging technology training, the device can be used without modification for different power equipment, the use efficiency is high, and since it is not directly installed on the power equipment, the heating light path and the detection light path are not visible to the naked eye, the heating point position can be selected as needed, and the randomness of the training content and the concealment of the examination content can be solved, and the use effect is good.

[0067] The present disclosure can be a system, a method, and / or a computer program product. The computer program product can include a computer readable storage medium having computer readable program instructions loaded thereon, the computer readable program instructions being configured to cause a processor to implement various aspects of the present disclosure.

[0068] Computer readable storage media can be tangible storage media which can retain and store instructions for use by an instruction execution device. Computer readable storage media can be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer readable storage media include the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or raised structures in a groove having instructions recorded thereon, and any suitable combination of the foregoing. A computer readable storage medium, as used herein, is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.

[0069] Computer readable program instructions described herein can be downloaded to respective computing / processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and / or a wireless network. The network can comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and / or edge servers. A network adapter card or network interface in each computing / processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing / processing device.

[0070] Computer readable program instructions for carrying out operations of the present disclosure can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++ or the like, and conventional procedural programming languages such as the "C" programming language or similar programming languages. The computer readable program instructions can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate arrays (FPGA), or programmable logic arrays (PLA) can execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present disclosure.

[0071] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced, and any modification or replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A temperature controllable laser heating device, characterized in that, The application relates to a controllable temperature laser heating device, comprising: a laser generator for generating a heating laser beam; a triangular prism assembly arranged on the same side of the laser generator and the detection control module, for refracting the laser beam to irradiate the power equipment for heating, and refracting the infrared radiation generated by the power equipment to irradiate the detection control module; a detection control module for detecting the infrared radiation to obtain the actual temperature of the heating point of the power equipment, and adjusting the output power of the laser generator based on the actual temperature and the preset temperature to control the deviation between the preset temperature and the actual temperature.

2. The controllable temperature laser heating device according to claim 1, characterized in that: the triangular prism assembly comprises at least one triangular prism made of optical material with a dispersion coefficient greater than 0.03 / nm.

3. A temperature controllable laser heating device according to claim 1, wherein, the detection control module comprises: an infrared thermal imaging sensor for detecting the infrared radiation and sending the infrared thermal imaging signal to the temperature control module.

4. The controllable temperature laser heating device according to claim 3, characterized in that: the infrared thermal imaging sensor comprises a narrow-band filter, and the transmission wave band of the narrow-band filter is matched with the characteristic radiation wavelength of the power equipment.

5. A temperature controllable laser heating device according to claim 1, wherein, the detection control module comprises: a temperature control module for converting the infrared thermal imaging signal into the actual temperature, and controlling the power of the laser generator based on the actual temperature and the preset temperature.

6. A temperature controllable laser heating device according to claim 5, wherein, the temperature control module comprises: a signal processing unit for converting the infrared thermal imaging signal into the actual temperature.

7. A temperature controllable laser heating device according to claim 5, wherein, the temperature control module comprises: a controller for calculating the deviation between the preset temperature and the actual temperature, and generating a control signal based on the deviation.

8. A temperature controllable laser heating device according to claim 5, wherein, the temperature control module comprises: a power adjusting circuit for adjusting the output power of the laser generator based on the control signal.

9. A temperature controllable laser heating device according to claim 1, wherein, the temperature control module comprises: the detection sampling frequency of the detection control module is not lower than five times of the output power adjusting frequency of the laser generator.

10. A heating method, implemented by means of a controllable temperature laser heating device according to any one of claims 1-9, characterized in that, The application relates to a controllable temperature laser heating device, comprising: refracting the laser beam to irradiate the power equipment for heating; detecting the refracted infrared radiation generated by the heating point of the power equipment to obtain the actual temperature of the heating point of the power equipment; adjusting the laser based on the actual temperature and the preset temperature to control the deviation between the preset temperature and the actual temperature.

Images