Laser-phosphorescence coupling type optical path system for two-dimensional phosphorescence temperature measurement optical fiber probe

Abstract

The invention discloses a laser-phosphorescence coupling type optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe, and relates to the field of non-contact solid surface temperature measurement, and the laser-phosphorescence coupling type optical path system is characterized in that an object to be measured is coated with a phosphorescence material coating; the laser light source generates laser capable of exciting the phosphorescent material coating; the laser transmission module is located on a light path of laser emitted by the laser light source; the light splitting module is positioned on a laser emergent light path of the laser transmission module and is also positioned on a phosphorescence emergent light path of the coupling transmission module; the coupling transmission module is positioned on a laser emergent light path which is turned back by the light splitting module and is also positioned on a phosphorescence emergent light path of the object to be measured; the image decomposition module is located on a phosphorescence emergent light path of the light splitting module; the image receiving module is located on a phosphorescence emergent light path of the image decomposition module. On the basis of realizing two-dimensional phosphorescence image acquisition, the laser and phosphorescence transmission efficiency is improved, the size of the probe is reduced, and the problem of high-efficiency transmission of two-dimensional phosphorescence signals in a narrow space is solved.

Description

Technical Field

[0001] The present application relates to the field of non-contact solid surface temperature measurement, and in particular to a laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe. Background Art

[0002] The continuously developing aviation technology has gradually increased the requirements for the comprehensive performance of aircraft engines. The design indicators of the hot end components of the engine have been continuously improved, and the load has gradually increased. Measuring the temperature of the hot end components of aircraft engines is an important means to improve the thermal design level of the engine and ensure the normal operation of the engine. Compared with measuring the local temperature points on the surface of the component, measuring the two-dimensional temperature field on the surface of the component can provide more accurate and comprehensive temperature information on the surface of the component, which is of great significance for improving the temperature measurement effect of the hot end components, and also conforms to the mainstream development trend of advanced temperature measurement technology. However, traditional temperature measurement technology is generally unable to achieve temperature field measurement, and the harsh conditions of high temperature, high pressure, high speed, complex gas composition, and strong background radiation of the hot end components further restrict the temperature measurement effect of traditional temperature measurement technology. Therefore, traditional temperature measurement technology is difficult to be effectively applied in the temperature measurement of the hot end components of aircraft engines, especially in the temperature field measurement.

[0003] Phosphorescence temperature measurement technology is an emerging non-contact temperature measurement technology. Based on the principle that the characteristics of stimulated emission of phosphorescence by phosphorescent materials change with temperature, the phosphorescent material coated on the surface of the object to be measured is first excited by laser, and then the excited phosphorescence signal is collected by optical equipment. The intensity ratio or lifetime-related characteristics of the collected phosphorescence signal are compared with the specific mapping relationship of temperature to achieve the temperature measurement of the object to be measured. It has the advantages of being able to achieve two-dimensional surface temperature measurement, the temperature measuring device not being in direct contact with the surface to be measured, the temperature measurement results being less affected by background radiation and absorption of gas components, a wide temperature measurement range and a high upper temperature measurement limit. It has great application potential in the temperature test of hot end components of aircraft engines.

[0004] At present, the application methods of phosphorescence temperature measurement technology in aircraft engines mainly include window test method and fiber optic probe test method. Among them, the temperature measuring instrument based on the window test method needs to open a window on the inner wall for laser and phosphorescence transmission when in use, which has the disadvantages of large damage to the wall, easy breakage of the window, and difficulty in signal transmission in a small area; the temperature measuring instrument based on the fiber optic probe test method has a smaller opening area on the wall when in use, has less interference with the internal flow field of the engine, can realize remote transmission of optical signals in a small space, and has good application prospects.

[0005] Most of the existing phosphorescence temperature measurement fiber optic probes can only collect phosphorescence signals at a single point, and cannot collect and transmit phosphorescence images, so they can only perform single-point temperature measurement. A few fiber optic probes with two-dimensional phosphorescence temperature measurement function generally adopt an optical path system design in which the laser transmission optical path and the phosphorescence collection optical path are separated from each other, that is, the laser and phosphorescence are transmitted using different optical fibers respectively, the laser transmission optical fiber and the phosphorescence transmission optical fiber are arranged in parallel, the front end of the optical fiber remains flush, and the rear end is forked and integrated with the laser optical path and the phosphorescence optical path respectively, thereby realizing the separate optical path transmission of the laser signal and the phosphorescence signal. In this type of separate optical path transmission scheme, due to the deviation of the optical axis of the phosphorescence transmission optical fiber and the phosphorescence signal output optical path, the phosphorescence transmission optical fiber cannot fully collect and transmit the phosphorescence signal emitted from the surface to be measured, and there are problems such as large optical signal loss and low phosphorescence collection efficiency. The parallel arrangement of the laser transmission optical fiber and the phosphorescence transmission optical fiber may also cause the outer diameter of the optical fiber bundle to be too large, affecting the application of the probe in the narrow space inside the aircraft engine.

[0006] Therefore, it is urgent to develop an optical path system for laser-phosphorescence coupled transmission to provide an optical path transmission solution with low optical signal loss, high phosphorescence collection efficiency, and small radial size for the two-dimensional phosphorescence temperature measurement fiber probe, so as to improve the temperature field test accuracy of the two-dimensional phosphorescence temperature measurement fiber probe inside the aircraft engine. Summary of the invention

[0007] The purpose of the present application is to provide a laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement fiber optic probe to solve the problems of low phosphorescence collection efficiency, inability to transmit two-dimensional images, and large radial size of the probe.

[0008] To achieve the above objectives, this application provides the following solutions:

[0009] In a first aspect, the present application provides a laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe, comprising:

[0010] An object to be measured, a laser light source, a laser transmission module, a light splitting module, a coupling transmission module, an image decomposition module and an image receiving module;

[0011] The object to be measured is coated with a phosphorescent material coating; the laser light source is used to generate a laser that can excite the phosphorescent material coating; the laser transmission module is located on the optical path of the laser emitted by the laser light source; the spectroscopic module is located on the laser emission optical path of the laser transmission module and on the phosphorescence emission optical path of the coupling transmission module; the spectroscopic module can fold the laser emission optical path while keeping the phosphorescence emission optical path undisturbed; the coupling transmission module is located on the laser emission optical path after being folded by the spectroscopic module and on the phosphorescence emission optical path of the object to be measured; the coupling transmission module includes an objective lens, an image transmission optical fiber and a coupling lens, and through the optical coupling design of the objective lens, the coupling lens and the end face of the image transmission optical fiber, the coaxial coupling transmission of the laser beam and the phosphorescence image is realized; the image decomposition module is located on the phosphorescence emission optical path of the spectroscopic module; the image receiving module is located on the phosphorescence emission optical path of the image decomposition module.

[0012] Optionally, the coupling transmission module includes an objective lens, an image transmission fiber and a coupling lens; the objective lens is located on the phosphorescence signal emission light path of the object to be measured, and the optical axis of the objective lens is perpendicular to the surface of the object to be measured; the coupling lens is arranged on the same optical axis as the objective lens, and is located on the laser emission light path after being folded by the light splitting module; the image transmission fiber is arranged between the objective lens and the coupling lens, and is located on both the phosphorescence transmission light path of the objective lens and the laser transmission light path of the coupling lens, and the two end faces of the image transmission fiber are respectively arranged perpendicular to the optical axes of the objective lens and the coupling lens. The specific distance between the objective lens and the object to be measured can be adjusted within 60mm to 300mm according to actual application requirements.

[0013] Optionally, the image transmission optical fiber is used to transmit the laser and the collected phosphorescence image on the same axis; the objective lens is used to converge the laser transmitted by the image transmission optical fiber to the object to be measured, and to image the phosphorescence emitted by the object to be measured to the first end face of the image transmission optical fiber; the coupling lens is used to converge the laser to the second end face of the image transmission optical fiber, and to transmit the phosphorescence image emitted by the image transmission optical fiber to the spectroscopic module.

[0014] Optionally, the spectroscopic module specifically includes: a laser-phosphorescence dichroic mirror and a converging lens; the laser-phosphorescence dichroic mirror is arranged on the laser output light path of the laser beam expander in the laser transmission module, and the laser output light path of the laser beam expander is the phosphorescence output light path of the coupling lens; the converging lens is arranged on the transmission light path of the laser-phosphorescence dichroic mirror.

[0015] Optionally, the image decomposition module specifically includes: a phosphorescent dichroic mirror, a phosphorescent reflector, a first eyepiece and a second eyepiece; the phosphorescent dichroic mirror is arranged on the transmitted light path of the converging lens in the splitting module; the phosphorescent reflector is arranged on the reflected light path of the phosphorescent dichroic mirror; the first eyepiece is arranged on the transmitted light path of the phosphorescent dichroic mirror; and the second eyepiece is arranged on the reflected light path of the phosphorescent reflector.

[0016] Optionally, the laser transmission module specifically includes: a laser power meter, a beam splitter, a laser reflector and a laser beam expander;

[0017] The beam splitter is arranged in the outgoing light path of the laser light source; the laser power meter is arranged in the reflected light path of the beam splitter; the reflector is arranged in the transmitted light path of the beam splitter; and the laser beam expander is arranged in the reflected light path of the reflector.

[0018] Optionally, the image receiving module specifically includes: a stereoscope and an ICCD camera;

[0019] The two lenses of the stereoscope are respectively arranged on the imaging optical paths of the first eyepiece and the second eyepiece in the image decomposition module; the stereoscope is used to receive phosphorescent images of different wavelengths transmitted from the image decomposition module and input the phosphorescent images into the ICCD camera;

[0020] The ICCD camera is connected to the stereoscope and is used to convert the phosphorescent image into an electrical signal.

[0021] Optionally, the image transmission optical fiber is a flexible image transmission optical fiber bundle made of fused silica.

[0022] Optionally, the number of the image transmission optical fiber is single.

[0023] According to the specific embodiments provided in the present application, the present application discloses the following technical effects: the present application utilizes a laser light source, a laser transmission module, a spectroscopic module and a coupled transmission module to achieve effective excitation of the phosphorescent material coating on the object to be measured, and utilizes a coupled transmission module, a spectroscopic module and an image decomposition module to efficiently collect, image and transmit two-dimensional phosphorescent signals. The present application adopts a phosphorescence collection scheme in which an image transmission fiber is used together with an objective lens and a coupling lens for imaging and transmission to replace the existing scheme of using an energy transmission fiber for single-point phosphorescence signal collection, thereby solving the problem that the existing phosphorescence temperature measurement fiber probe optical path system cannot transmit a two-dimensional image; in addition, the coupling transmission module uses the image transmission fiber as the transmission core and uses the objective lens, the coupling lens and the two end faces of the image transmission fiber for optical coupling design, so that the image transmission fiber is simultaneously used as the transmission fiber for both the laser signal and the phosphorescence image, achieving the technical effect of realizing the coaxial coupled transmission of laser and phosphorescence with only one image transmission fiber, solving the problem in the prior art that the optical fiber cannot fully collect and transmit the phosphorescence signal due to the separate transmission of laser and phosphorescence, reducing the optical signal loss and improving the phosphorescence collection efficiency; finally, the present invention adopts a single image transmission fiber to realize the coaxial coupled transmission of the laser beam and the phosphorescence image, thereby solving the problem in the prior art that the outer diameter of the probe is too large due to the use of two or more optical fibers arranged in parallel, and can bring the beneficial effect of "small radial size of the probe". BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the module structure of a laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement probe provided in one embodiment of the present application;

[0026] Figure 2 A schematic diagram of the specific structure of a laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement probe provided in one embodiment of the present application.

[0027] Explanation of symbols:

[0028] Object to be measured 1, laser light source 2, laser transmission module 3, spectroscopic module 4, coupled transmission module 5, image decomposition module 6, image receiving module 7, power meter 3-1, beam splitter 3-2, laser reflector 3-3, laser beam expander 3-4, laser-phosphorescent dichroic mirror 4-1, converging lens 4-2, objective lens 5-1, image transmission optical fiber 5-2, coupling lens 5-3, phosphorescent dichroic mirror 6-1, phosphorescent reflector 6-2, first eyepiece 6-3, second eyepiece 6-4, stereoscope 7-1, ICCD camera 7-2. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] like Figure 1 As shown, the laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement fiber optic probe provided in an embodiment of the present application includes: an object to be measured 1, a laser light source 2, a laser transmission module 3, a spectrometer module 4, a coupling transmission module 5, an image decomposition module 6 and an image receiving module 7.

[0032] The object to be tested 1 is coated with a phosphorescent material coating.

[0033] The laser light source 2 generates laser light that can excite the phosphorescence signal of the sample to be tested.

[0034] The laser transmission module 3 is located on the optical path of the laser emitted by the laser light source 2 ; the laser transmission module 3 can transmit the laser to the light splitting module 4 .

[0035] The spectroscopic module 4 is located on the reflection light path of the laser transmission module 3 and the phosphorescence signal emission light path of the coupling transmission module 5; the spectroscopic module 4 can both reflect the laser to form an optical path for the laser to irradiate the coupling transmission module 5, and effectively transmit the phosphorescence signal to ensure that the phosphorescence enters the image decomposition module 6.

[0036] The coupling transmission module 5 is located on the laser emission light path after being deflected by the spectroscopic module 4 and on the phosphorescence signal emission light path of the object to be measured 1; the coupling transmission module 5 can not only transmit the laser to the object to be measured 1, but also collect and image the phosphorescence signal emitted from the object to be measured 1, and transmit the phosphorescence image to the spectroscopic module 4.

[0037] The image decomposition module 6 is located on the phosphorescence transmission light path of the spectroscopic module 4 ; the image decomposition module 6 can receive the phosphorescence image passing through the spectroscopic module 4 and transmit it to the image receiving module 7 .

[0038] The image receiving module 7 is located on the outgoing light path of the image decomposition module 6 ; the image receiving module 7 can receive the phosphorescence signal transmitted by the image decomposition module 6 and convert it into an electrical signal.

[0039] The present application realizes the coaxial coupled transmission of the laser beam and the phosphorescence image through a single image transmission optical fiber bundle, thereby solving the problems of low efficiency in existing phosphorescence collection, inability to transmit two-dimensional images, and large radial size of the probe. It has the beneficial effects of low optical signal loss, high phosphorescence collection efficiency, ability to collect and transmit two-dimensional phosphorescence images, and small radial size of the probe.

[0040] In another exemplary embodiment, Figure 2 As shown, the power meter 3-1, the beam splitter 3-2, the laser reflector 3-3, and the laser beam expander 3-4 constitute the laser transmission module 3; the objective lens 5-1, the image transmission optical fiber 5-2, and the coupling lens 5-3 constitute the coupling transmission module 5; the laser-phosphorescent dichroic mirror 4-1 and the converging lens 4-2 constitute the splitting module 4; the phosphorescent dichroic mirror 6-1, the phosphorescent reflector 6-2, the first eyepiece 6-3, and the second eyepiece 6-4 constitute the image decomposition module 6; the stereoscope 7-1 and the ICCD camera 7-2 constitute the image receiving module 7.

[0041] The present invention utilizes a coupled transmission module 5 with an image transmission optical fiber as the transmission core to realize coaxial coupled transmission of laser and phosphorescent images, wherein a laser light source 2, a laser transmission module 3, a spectroscopic module 4 and a coupled transmission module 5 are utilized to transmit laser to an object to be measured 1, so as to realize the excitation of the phosphorescent material coating on the surface of the object to be measured 1, and the coupled transmission module 5, the spectroscopic module 4, the image decomposition module 6 and the image receiving module 7 are utilized to collect, transmit and receive the two-dimensional phosphorescent signal excited on the surface of the object to be measured 1.

[0042] The present application uses the image transmission fiber as the transmission core and adopts the objective lens 5-1, the coupling lens 5-3 and the two end faces of the image transmission fiber 5-2 for optical coupling design, thereby realizing the coaxial coupling transmission of the laser beam and the phosphorescence image, improving the fiber coupling efficiency and the phosphorescence collection efficiency, reducing the complexity of the optical path structure and the signal loss in the optical transmission process, and effectively reducing the radial size of the probe, thereby realizing efficient transmission of the laser and efficient collection and imaging of phosphorescence in a small space, providing an efficient optical path system for the two-dimensional phosphorescence temperature measurement fiber probe, which can solve the problems of difficult phosphorescence image collection and low temperature measurement accuracy when the phosphorescence temperature measurement technology is applied to the small space inside the aircraft engine, and improve the temperature field test accuracy of the two-dimensional phosphorescence temperature measurement fiber probe.

[0043] The implementation method of transmitting laser to the object to be measured 1 is as follows: the laser generated by the laser light source 2 is emitted and reaches the beam splitter 3-2, the beam splitter 3-2 reflects a part of the laser to the power meter 3-1, and the remaining laser is transmitted to the laser reflector 3-3 and reflected, and after being expanded by the laser beam expander 3-4, it reaches the laser-phosphorescent dichroic mirror 4-1, and the laser-phosphorescent dichroic mirror 4-1 reflects the laser to the coupling lens 5-3, and the laser is transmitted to the object to be measured 1 through the coupling lens 5-3, the objective lens 5-1 and the image transmission optical fiber 5-2 in sequence.

[0044] The implementation method of collecting, transmitting and receiving phosphorescence excited on the surface of the object to be tested 1 is as follows: after the phosphorescence radiated by the object to be tested 1 under the induction of laser is emitted, it is transmitted to the image transmission fiber 5-2 through the objective lens 5-1, and then sequentially transmitted to the phosphorescence dichroic mirror 6-1 through the coupling lens 5-3, the laser-phosphorescence dichroic mirror 4-1 and the converging lens 4-2. After the phosphorescence image transmitted through the converging lens 4-2 is transmitted to the phosphorescence dichroic mirror 6-1, the phosphorescence image less than a certain wavelength is transmitted to the first eyepiece 6-3 through the phosphorescence dichroic mirror 6-1, and the phosphorescence image greater than a certain wavelength is reflected to the phosphorescence reflector 6-2 through the phosphorescence dichroic mirror 6-1 and further reflected to the second eyepiece 6-4. At this point, the collected two-dimensional phosphorescence image is divided into two images of different wavelength bands, and is received by the two lenses of the stereoscope 7-1 respectively. The stereoscope 7 - 1 is used to receive phosphorescence images of different wavelength bands transmitted from the image decomposition module 6 and input them into the ICCD camera 7 - 2 .

[0045] Specifically, the laser light source 2 can provide pulsed laser light for exciting the phosphorescence of the sample to be tested, and the wavelength is preferably 355 nm and the frequency is preferably 20 Hz.

[0046] The laser power meter 3 - 1 can measure the laser power in real time to monitor the laser power fluctuation.

[0047] The laser-phosphorescence dichroic mirror 4 - 1 can reflect the laser light and create an optical channel for the laser light to irradiate the object to be measured 1 , while not affecting the transmission of phosphorescence with a longer wavelength.

[0048] The stereoscope 7 - 1 can receive images of different wavelengths respectively through two coplanar lenses, thereby achieving the effect of simultaneously acquiring two images of different wavelengths while using one camera.

[0049] Preferably, the objective lens 5-1 is made of sapphire or fused quartz.

[0050] Preferably, the image transmission optical fiber 5-2 is a flexible image transmission optical fiber bundle made of fused silica.

[0051] Preferably, the phosphorescent dichroic mirror 6 - 1 transmits phosphorescent light having a longer wavelength of 493 nm and reflects phosphorescent light having a shorter wavelength of 455 nm.

[0052] Preferably, the two lenses of the stereoscope 7-1 receive phosphorescence signals with wavelengths of 455nm and 493nm respectively.

[0053] Preferably, the two lenses of the stereoscope 7-1 receive phosphorescence signals with wavelengths of 455nm and 493nm respectively.

[0054] In summary, phosphorescence temperature measurement technology can measure the temperature of rotating components, and the luminescence is independent of blackbody radiation and surface emissivity. Compared with existing temperature measurement technology, it is more suitable for non-contact high-temperature measurement. The present invention provides a laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement fiber probe for phosphorescence temperature measurement technology, which uses a laser light source 2, a laser transmission module 3, a spectroscopic module 4 and a coupled transmission module 5 to achieve effective excitation of the phosphorescent material coating of the object to be measured 1, and uses the coupled transmission module 5, the spectroscopic module 4 and the image decomposition module 6 to efficiently collect, image and transmit two-dimensional phosphorescence signals, and uses the image receiving module 7 to receive optical signals and convert and process electrical signals for phosphorescence images. The laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement fiber probe provided by the present invention realizes efficient transmission of lasers and efficient collection of phosphorescence images, improves the fiber coupling efficiency, reduces signal loss during optical transmission, and can effectively improve the temperature field test accuracy of the two-dimensional phosphorescence temperature measurement fiber probe.

[0055] The present application adopts a single image transmission fiber bundle to realize the co-axial coupled transmission of the laser beam and the phosphorescence image: the existing technical scheme adopts two or more different optical fibers arranged in parallel to separately transmit the laser and the phosphorescence, resulting in the deviation of the optical axis of the phosphorescence transmission fiber and the phosphorescence output light path, thereby causing the phosphorescence transmission fiber to be unable to fully collect and transmit the phosphorescence signal emitted from the surface to be measured. To address this problem, a co-axial coupled transmission scheme of the laser beam and the phosphorescence image based on a single image transmission fiber bundle is proposed, which can ensure that the optical axes of the image transmission fiber bundle, the laser beam and the phosphorescence image remain coincident, thereby achieving the beneficial effects of improving the fiber coupling efficiency and reducing the optical signal loss, thereby realizing efficient transmission of laser signals and efficient collection of phosphorescence images.

[0056] The present application adopts an image transmission fiber bundle in conjunction with a lens group to realize the collection and transmission of two-dimensional phosphorescence images: in order to address the problem that the existing technical solutions using a single energy transmission fiber for phosphorescence signal transmission can only collect and transmit phosphorescence signals at a single point, an image transmission fiber bundle with an image transmission function is used as the transmission fiber of phosphorescence, and a lens group is used to realize imaging of phosphorescence, thereby realizing the collection and transmission of two-dimensional phosphorescence images, thereby supporting the phosphorescence temperature measurement probe to realize the measurement of the temperature field of the surface to be measured.

[0057] The present application has the following advantages.

[0058] Advantage 1: Ability to capture and transmit two-dimensional phosphorescence images.

[0059] The present invention adopts an image transmission fiber bundle with an image transmission function as a transmission fiber for phosphorescence, and realizes the collection and transmission of a two-dimensional phosphorescence image through a coupled imaging design of an objective lens 5-1, a coupling lens 5-3 and an end face of an image transmission fiber 5-2, thereby solving the problem in the prior art that the optical path system of a phosphorescence temperature measurement fiber optic probe can only transmit phosphorescence signals at a single point, and can support the phosphorescence temperature measurement probe to realize the measurement of the temperature field of the surface to be measured.

[0060] Advantage 2: Smaller optical signal loss and higher phosphorescence collection efficiency.

[0061] The present invention adopts a single image transmission optical fiber as a common transmission channel for laser and phosphorescence, and respectively adopts an objective lens 5-1, a coupling lens 5-3 and two end faces of the image transmission optical fiber 5-2 for optical coupling design, thereby forming a coupled transmission module with the image transmission optical fiber as the core, thereby realizing coaxial coupled transmission of laser and phosphorescence, solving the problem in the prior art that the optical fiber cannot fully collect and transmit the phosphorescence signal emitted from the surface to be measured due to the separate transmission of laser and phosphorescence, ensuring that the optical axes of the image transmission optical fiber bundle, the laser beam and the phosphorescence image remain coincident, thereby achieving the beneficial effect of reducing optical signal loss and improving phosphorescence collection efficiency.

[0062] Advantage 3: The radial dimension of the probe is small.

[0063] The present invention adopts a single image transmission fiber bundle to realize the coaxial coupled transmission of the laser beam and the phosphorescent image, thereby solving the problem of excessively large outer diameter of the probe caused by the parallel arrangement of two or more optical fibers in the prior art solution, and can effectively support the use of the probe in a small space.

[0064] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe, characterized in that: The laser-phosphorescence coupling optical path system for the two-dimensional phosphorescence temperature measurement optical fiber probe comprises: An object to be measured, a laser light source, a laser transmission module, a light splitting module, a coupling transmission module, an image decomposition module and an image receiving module; The object to be measured is coated with a phosphorescent material coating; the laser light source is used to generate a laser that can excite the phosphorescent material coating; the laser transmission module is located on the optical path of the laser emitted by the laser light source; the spectroscopic module is located both on the laser emission optical path of the laser transmission module and on the phosphorescence emission optical path of the coupling transmission module; the spectroscopic module can fold the laser emission optical path while keeping the phosphorescence emission optical path undisturbed; the coupling transmission module is located both on the laser emission optical path after being folded by the spectroscopic module and on the phosphorescence emission optical path of the object to be measured; the coupling transmission module includes an objective lens, an image transmission optical fiber and a coupling lens, and through the optical coupling design of the objective lens, the coupling lens and the end face of the image transmission optical fiber, the coaxial coupling transmission of the laser beam and the phosphorescence image is realized; the image decomposition module is located on the phosphorescence emission optical path of the spectroscopic module; the image receiving module is located on the phosphorescence emission optical path of the image decomposition module.

2. The laser-phosphorescence coupling optical path system for two-dimensional phosphorescence temperature measurement optical fiber probe according to claim 1, characterized in that: The coupling transmission module comprises an objective lens, an image transmission optical fiber and a coupling lens; the objective lens is located on the phosphorescence signal emission light path of the object to be measured, and the optical axis of the objective lens is perpendicular to the surface of the object to be measured; the coupling lens is arranged on the same optical axis as the objective lens and is located on the laser emission light path after being folded by the light splitting module; The image transmission optical fiber is arranged between the objective lens and the coupling lens, and is located on both the phosphorescence transmission light path of the objective lens and the laser transmission light path of the coupling lens. The two end faces of the image transmission optical fiber are respectively arranged perpendicular to the optical axes of the objective lens and the coupling lens.

3. The laser-phosphorescence coupling optical path system for two-dimensional phosphorescence temperature measurement optical fiber probe according to claim 2, characterized in that: The image transmission optical fiber is used for coaxial transmission of laser light and the collected phosphorescence image; the objective lens is used for converging the laser light transmitted by the image transmission optical fiber onto the object to be measured, and imaging the phosphorescence emitted by the object to be measured onto the first end face of the image transmission optical fiber; the coupling lens is used for converging the laser light onto the second end face of the image transmission optical fiber, and transmitting the phosphorescence image emitted by the image transmission optical fiber to the spectroscopic module.

4. The laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe according to claim 1, characterized in that: The spectroscopic module specifically includes: a laser-phosphorescent dichroic mirror and a converging lens; the laser-phosphorescent dichroic mirror is arranged on the laser output light path of the laser beam expander in the laser transmission module, and the laser output light path of the laser beam expander is the phosphorescent output light path of the coupling lens; the converging lens is arranged on the transmission light path of the laser-phosphorescent dichroic mirror.

5. The laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe according to claim 1, characterized in that: The image decomposition module specifically includes: a phosphorescent dichroic mirror, a phosphorescent reflector, a first eyepiece and a second eyepiece; the phosphorescent dichroic mirror is arranged on the transmitted light path of the converging lens in the splitting module; the phosphorescent reflector is arranged on the reflected light path of the phosphorescent dichroic mirror; the first eyepiece is arranged on the transmitted light path of the phosphorescent dichroic mirror; and the second eyepiece is arranged on the reflected light path of the phosphorescent reflector.

6. The laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe according to claim 1, characterized in that: The laser transmission module specifically includes: a laser power meter, a beam splitter, a laser reflector and a laser beam expander; The beam splitter is arranged in the outgoing light path of the laser light source; the laser power meter is arranged in the reflected light path of the beam splitter; the reflector is arranged in the transmitted light path of the beam splitter; and the laser beam expander is arranged in the reflected light path of the reflector.

7. The laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe according to claim 1, characterized in that: The image receiving module specifically includes: a stereoscope and an ICCD camera; The two lenses of the stereoscope are respectively arranged on the imaging optical paths of the first eyepiece and the second eyepiece in the image decomposition module; the stereoscope is used to receive phosphorescent images of different wavelengths transmitted from the image decomposition module and input the phosphorescent images into the ICCD camera; The ICCD camera is connected to the stereoscope and is used to convert the phosphorescent image into an electrical signal.

8. The laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe according to claim 2, characterized in that: The image transmission optical fiber is a flexible image transmission optical fiber bundle made of fused quartz.

9. The laser-phosphorescence coupling optical path system for a two-dimensional phosphorescence temperature measurement optical fiber probe according to claim 2, characterized in that: The number of the image transmission optical fiber is single.

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