Sensor based on phosphorescent coating

Abstract

The utility model provides a sensor based on a phosphorescent coating, the sensor is used for measuring single-point and two-dimensional temperature of a solid surface, the sensor comprises a phosphorescent coating, a probe, a light source and an industrial camera, the probe is respectively connected with the light source and the industrial camera; the phosphorescent coating is used for being smeared on the surface of a detected solid; the light source is used for emitting a light beam, and the light beam is transmitted to the surface of the phosphorescent coating after being transmitted by the probe; the phosphorescent coating generates return light after receiving the light beam, and the return light is transmitted by the probe and then is collected by the industrial camera; the industrial camera is used for collecting phosphorescence signals generated by the phosphorescence coating, the solid surface temperature in the high-temperature environment is measured through phosphorescence signal conversion, the sensor adopts the phosphorescence coating technology, the cost can be reduced while high precision is guaranteed, and the efficiency and reliability of measuring the surface temperature of the aero-engine blade are improved.

Description

Technical Field

[0001] The utility model relates to a phosphorescent probe port used in a high-temperature environment, and particularly to a sensor based on a phosphorescent coating. Background Art

[0002] Facing the future extreme harsh environmental conditions such as high temperature, high pressure, and high speed, the key to ensuring the performance of an aero-engine lies in the structural strength design and working performance test during its development process. And the prerequisite for all this is to obtain accurate data of various performance parameters of the aero-engine. Especially the measurement accuracy of the surface temperature of the engine blade, which is directly related to the effectiveness of the design of the cooling system and the thermal analysis system.

[0003] At present, the measurement methods of the surface temperature of aero-engine blades are mainly divided into two categories: contact type and non-contact type. Contact temperature measurement includes methods such as thermocouples, thermochromic paints, and crystal temperature measurement. Although these methods have relatively high measurement accuracy, they may cause damage to the engine blades or affect their normal operation. Non-contact temperature measurement mainly includes temperature measurement technologies such as infrared radiation, phosphorescence, and optical fibers. These methods do not need to contact the blade surface, avoiding the disadvantages of contact measurement.

[0004] Among these non-contact temperature measurement technologies, phosphorescence temperature measurement technology shows great potential due to its advantages such as non-contact and anti-environmental interference. The principle of phosphorescence temperature measurement technology is to apply a phosphorescent material on the surface of the object to be measured, and measure the temperature by the light emitted by the phosphorescent material excited by a laser with a specific frequency. Compared with the traditional single-point measurement method, phosphorescence temperature measurement technology can realize temperature measurement of a two-dimensional plane or even a three-dimensional space curved surface, which is its greatest advantage.

[0005] At present, the methods of phosphorescence temperature measurement are mainly divided into six categories: intensity method, lifetime decay method, intensity ratio method, rise time method, frequency shift method, and peak shift method. Among them, the intensity method, intensity ratio method, and lifetime decay method are the three most commonly used methods. These methods respectively realize temperature measurement based on the relationship between the change of phosphorescence intensity, decay lifetime, or spectral peak and temperature.

[0006] Compared with the traditional contact temperature measurement method, phosphorescence temperature measurement technology is still in the development stage, but it has already shown the ability to break through the traditional technical bottleneck. Although phosphorescence temperature measurement has the advantage of low use cost, in some cases, such as when special equipment or materials are required, the measurement cost may increase. Content of the Utility Model

[0007] The purpose of the utility model is to solve the problems of high cost and low temperature measurement accuracy in the prior art, so a sensor based on a phosphorescent coating is provided. By adopting the phosphorescent coating technology, it can reduce the cost while ensuring high precision, and improve the efficiency and reliability of the surface temperature measurement of aero-engine blades.

[0008] To solve the above technical problems, the present utility model provides a sensor based on a phosphorescent coating, which is used to measure the single-point and two-dimensional temperatures of a solid surface. The sensor includes a phosphorescent coating, a probe, a light source, and an industrial camera. The probe is respectively connected to the light source and the industrial camera;

[0009] The phosphorescent coating is used to be smeared on the surface of the solid to be measured; the light source is used to emit a light beam, which is transmitted through the probe and then emitted to the surface of the phosphorescent coating;

[0010] After receiving the light beam, the phosphorescent coating generates a return light, which is transmitted through the probe and then collected by the industrial camera; the industrial camera is used to collect the phosphorescent signal generated by the phosphorescent coating.

[0011] In a preferred embodiment, the phosphorescent coating is a mixture of Y2O3:Eu material and PDC ceramic; the phosphorescent coating is smeared on the surface of the solid to be measured by the Weissenberg direct writing technique.

[0012] In a preferred embodiment, the probe includes a housing, and a first reflector, a first convex lens, a second reflector, a second convex lens, a high-pass filter, a narrow-band filter, a third convex lens, and a dichroic mirror arranged inside the probe;

[0013] The central wavelength of the high-pass filter is 400 nm, and the central wavelength of the narrow-band filter is 610 nm.

[0014] In a preferred embodiment, the high-pass filter and the narrow-band filter are horizontally arranged at the top of the probe, and the high-pass filter and the narrow-band filter are arranged at the same height;

[0015] The second convex lens and the third convex lens are respectively correspondingly and horizontally arranged below the high-pass filter and the narrow-band filter, and the second convex lens and the third convex lens are arranged at the same height;

[0016] The second reflector and the dichroic mirror are respectively correspondingly and obliquely arranged below the second convex lens and the third convex lens, and the second reflector and the dichroic mirror are arranged in parallel;

[0017] A first reflector is arranged at the bottom of the probe, and a first convex lens is installed by opening a hole on one side of the bottom of the housing. The first reflector is arranged obliquely towards the first convex lens.

[0018] In a preferred embodiment, the transmission of the light beam emitted by the light source in the probe is that the light beam passes through the high-pass filter and is reflected by the second convex lens to the second reflector, and then reflected by the second reflector to the dichroic mirror;

[0019] It is emitted to the first reflector through the dichroic mirror, reflected by the first reflector to the first convex lens, and the first convex lens converges and emits it to the phosphorescent coating.

[0020] In a preferred embodiment, the transmission of the returned light within the probe is as follows: the returned light is shaped by a first convex lens and emitted parallel to a first reflector, and is reflected by the first reflector to a dichroic mirror;

[0021] The dichroic mirror transmits the returned light, and after being converged by a third convex lens and passing through a narrow-band filter, it is collected by an industrial camera.

[0022] In a preferred embodiment, the outer shell is made of a high-temperature resistant material, and a black light-absorbing coating is applied inside the outer shell.

[0023] In a preferred embodiment, the laser beam wavelength emitted by the light source is 395 nm / 405 nm.

[0024] In a preferred embodiment, the light source is an LED-UV point light source.

[0025] In a preferred embodiment, the industrial camera is an industrial CMOS micro camera.

[0026] Compared with the prior art, the technical solution of the present utility model has the following beneficial effects:

[0027] 1. By applying a phosphorescent coating on the surface of the solid to be measured, the temperature information is converted into a detectable optical signal. The probe is responsible for accurately transmitting the light beam emitted by the light source to the surface of the phosphorescent coating and receiving the returned phosphorescent signal. The industrial camera collects the phosphorescent signal and converts it into temperature data to achieve temperature measurement.

[0028] 2. Utilizing the phosphorescent coating technology, the sensor can achieve accurate measurement of the temperature on the solid surface, meeting the high-precision requirements. It can not only perform single-point temperature measurement but also map the two-dimensional temperature field through an industrial camera, providing more comprehensive thermal state information.

[0029] 3. Compared with the traditional contact temperature measurement method, while ensuring high precision, this sensor can reduce the overall measurement cost. The stable connection between the phosphorescent coating and the probe and the high stability of the industrial camera ensure the reliability of the measurement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the sensor based on a phosphorescent coating in the preferred embodiment of the present utility model;

[0031] Figure 2 It is a schematic diagram of the internal structure of the probe in the preferred embodiment of the present utility model.

[0032] Description of reference numerals: 1, phosphorescent coating; 2, probe; 3, industrial camera; 4, light source; 5, housing; 6, first reflector; 7, first convex lens; 8, second reflector; 9, second convex lens; 10, high-pass filter; 11, narrow-band filter; 12, third convex lens; 13, dichroic mirror. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a wall-mounted connection, a detachable connection, or an integral connection, can be a mechanical connection, can be an electrical connection, can be directly connected, or can be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] Refer to Figure 1 - Figure 2 , this embodiment provides a sensor based on a phosphorescent coating. This sensor is used to measure the single-point and two-dimensional temperatures of the solid surface. The main applications of this sensor mainly include the temperature measurement of the solid surface in high-temperature environments such as the turbine blades of aeroengines. According to different application scenarios, the relationship between the phosphorescent signal intensity and the temperature can also be dynamically adjusted to obtain a more accurate measurement result.

[0037] The sensor provided in this embodiment includes a phosphorescent coating 1, a probe 2, a light source 4, and an industrial camera 3. The probe 2 is connected to the light source 4 and the probe 2 is connected to the industrial camera 3. The phosphorescent coating 1 is used to coat the surface of the solid to be measured. The light source 4 is used to emit a light beam, which is transmitted through the probe 2 and then emitted to the surface of the phosphorescent coating 1. After receiving the light beam, the phosphorescent coating 1 generates a return light, which is transmitted through the probe 2 and then collected by the industrial camera 3. The industrial camera 3 is used to collect the phosphorescent signal generated by the phosphorescent coating 1 to measure the surface temperature of the solid in a high-temperature environment. The upper temperature measurement limit of this sensor is 600 °C.

[0038] The phosphorescent coating 1 adopts a mixture of Y2O3:Eu material and PDC ceramic. The phosphorescent coating 1 is a technology that uses the phenomenon of phosphorescent materials absorbing light energy and emitting phosphorescence to measure temperature. Y2O3:Eu (yttrium oxide doped with europium) is used as a phosphorescent material, which has good luminescence performance and temperature sensitivity and is used for temperature measurement. PDC ceramic (phosphor-converted ceramic) is a porous ceramic material and is used as a carrier for Y2O3:Eu to increase its adhesion to the substrate and heat conductivity.

[0039] The phosphorescent coating 1 is coated by using the advanced Vesenberg direct writing technology to form a uniform phosphorescent coating 1. The Vesenberg direct writing technology (VDW for short) is a non-contact coating technology that directly deposits a mixture of Y2O3:Eu material and PDC ceramic onto the surface of the solid to be measured by precisely controlling the spraying system.

[0040] By combining the Y2O3:Eu material and PDC ceramic mixture with the Vesenberg direct writing technology, the phosphorescent coating 1 can achieve precise temperature measurement and thermal analysis.

[0041] The light source 4 adopts a 405nm, 12W LED-UV point light source 4, with an irradiation distance of 50mm, forming a light spot with a diameter of 7mm. The light source 4 has an externally controlled laser control function to ensure the accuracy and repeatability of the measurement process. The laser beam emitted by the light source 4 has a wavelength of 395nm / 405nm.

[0042] The industrial camera selected is an industrial CMOS micro camera, with a reference model of MU9PM-MH / MU9PC-MH from German company XIMEA, having a 5MP resolution and an image size of 2592×1944, ensuring the clarity and details of image acquisition.

[0043] The described probe 2 includes a housing 5, and a first mirror 6, a first convex lens 7, a second mirror 8, a second convex lens 9, a high-pass filter 10, a narrow-band filter 11, a third convex lens 12, and a dichroic mirror 13 disposed inside the probe 2. Among them, the central wavelength of the high-pass filter 10 is 400 nm, and the central wavelength of the narrow-band filter 11 is 610 nm.

[0044] The housing 5 is made of high-temperature resistant material to ensure stability and safety even under extreme temperature conditions. And a black light-absorbing coating is applied inside the housing 5, which can effectively absorb interfering light and reduce background noise, thereby improving the acquisition accuracy of phosphorescence signals. The probe 2 is used for the effective transmission of excitation light signals and the accurate acquisition of phosphorescence signals.

[0045] Such as Figure 2 , the positions of the internal components of the probe 2 are set such that the high-pass filter 10 and the narrow-band filter 11 are horizontally disposed at the top of the probe 2, and the high-pass filter 10 and the narrow-band filter 11 are set at the same height. The second convex lens 9 and the third convex lens 12 are respectively corresponding and horizontally disposed below the high-pass filter 10 and the narrow-band filter 11, and the second convex lens 9 and the third convex lens 12 are set at the same height. The second mirror 8 and the dichroic mirror 13 are respectively corresponding and inclinedly disposed below the second convex lens 9 and the third convex lens 12, and the second mirror 8 and the dichroic mirror 13 are parallelly disposed. The first mirror 6 is disposed at the bottom of the probe 2, and the first convex lens 7 is installed through an opening on one side of the bottom of the housing 5, and the first mirror 6 is inclinedly disposed towards the first convex lens 7.

[0046] In this embodiment, the phosphorescent coating 1 is formed by a mixture of Y2O3:Eu material and PDC ceramic to form a highly sensitive temperature-indicating probe 2, and it is precisely applied on the surface of the solid to be measured by using the Weissenberg direct writing technique. And a UV point light source 4 with wavelengths of 395 nm / 405 nm is selected as the excitation light source 4, and this light source 4 can efficiently excite the phosphorescent coating 1. The probe 2 not only transmits the light beam emitted by the excitation light source 4 to the phosphorescent coating 1, but also is responsible for transmitting the phosphorescence signal generated by the coating to the micro industrial camera 3. A high-resolution industrial CMOS micro camera is selected, which has excellent image capture ability to ensure the accurate acquisition and analysis of phosphorescence signals. The collected phosphorescence signals will be processed by specific software algorithms, and according to the known relationship between phosphorescence intensity and temperature, they will be converted into the temperature value of the surface of the solid to be measured.

[0047] In this embodiment, the measurement process of the sensor is as follows: The LED-UV point light source 4 emits a 395nm / 405nm light beam as the excitation light beam. This light beam is filtered by the high-pass filter 10 to remove some interference signals, and is shaped by the second convex lens 9 to form a parallel or nearly parallel light beam and is reflected to the second mirror 8. The emitted light signal of this light beam is reflected by the second mirror 8, emitted to the dichroic mirror 13, and then reflected by the dichroic mirror 13 and emitted to the first mirror 6. After being reflected by the first mirror 6, it passes through the first convex lens 7. The emitted light signal of this light beam is focused and emitted to the phosphorescent coating 1 through the first convex lens 7. The light beam emitted by the LED-UV point light source 4 finally focuses on the surface of the phosphorescent coating 1 after passing through the probe 2, generating phosphorescence.

[0048] The returned phosphorescence generated by the phosphorescent coating 1 is shaped by the first convex lens 7, and the phosphorescence signal is emitted to the first mirror 6 in a parallel or nearly parallel manner. After being reflected by the first mirror 6, the phosphorescence signal is transmitted through the dichroic mirror 13, aggregated by the third convex lens 12, and filtered by the narrow-band filter 11 to remove some interference signals. Then the phosphorescence signal is collected by the micro industrial camera 3. According to the one-to-one correspondence between the phosphorescence signal intensity and the temperature, the temperature of the measured solid surface can be calculated from the collected phosphorescence signal.

[0049] The above is only the preferred specific embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention who makes non-substantial modifications to the present invention using this concept shall fall within the scope of infringement of the protection of the present invention.

Claims

1. A sensor based on a phosphorescent coating, which is used to measure the single-point and two-dimensional temperatures of a solid surface, and is characterized in that: The sensor includes a phosphorescent coating, a probe, a light source, and an industrial camera. The probe is respectively connected to the light source and the industrial camera; The phosphorescent coating is used to coat the surface of the solid to be measured; the light source is used to emit a light beam, which is transmitted through the probe and then emitted to the surface of the phosphorescent coating; After receiving the light beam, the phosphorescent coating generates a return light, which is transmitted through the probe and then collected by the industrial camera; The industrial camera is used to collect the phosphorescent signal generated by the phosphorescent coating.

2. The sensor based on a phosphorescent coating according to claim 1, characterized in that: The probe includes a housing, and a first reflector, a first convex lens, a second reflector, a second convex lens, a high-pass filter, a narrow-band filter, a third convex lens, and a dichroic mirror arranged inside the probe; The center wavelength of the high-pass filter is 400 nm, and the center wavelength of the narrow-band filter is 610 nm.

3. The sensor based on a phosphorescent coating according to claim 2, characterized in that: The high-pass filter and the narrow-band filter are horizontally arranged at the top of the probe, and the high-pass filter and the narrow-band filter are arranged at the same height; The second convex lens and the third convex lens are respectively correspondingly and horizontally arranged below the high-pass filter and the narrow-band filter, and the second convex lens and the third convex lens are arranged at the same height; The second reflector and the dichroic mirror are respectively correspondingly and obliquely arranged below the second convex lens and the third convex lens, and the second reflector and the dichroic mirror are arranged in parallel; A first reflector is arranged at the bottom of the probe, and the first convex lens is installed through an opening on one side of the bottom of the housing. The first reflector is arranged obliquely towards the first convex lens.

4. The sensor based on a phosphorescent coating according to claim 3, wherein: The transmission of the light beam emitted by the light source in the probe is that the light beam passes through the high-pass filter and is reflected by the second convex lens to the second reflector, and then is reflected by the second reflector to the dichroic mirror; It is emitted to the first reflector through the dichroic mirror, reflected by the first reflector to the first convex lens, and the first convex lens converges and emits it to the phosphorescent coating.

5. The sensor based on a phosphorescent coating according to claim 3, characterized in that: The transmission of the return light in the probe is that the return light is shaped by the first convex lens, parallelly emitted to the first reflector, and reflected by the first reflector to the dichroic mirror; The dichroic mirror transmits the return light, which is collected by the industrial camera after being converged by the third convex lens and passing through the narrow-band filter.

6. The sensor based on a phosphorescent coating according to claim 2, characterized in that: The housing is made of a high-temperature resistant material, and a black light-absorbing coating is applied inside the housing.

7. The sensor based on a phosphorescent coating according to claim 1, wherein: The wavelength of the laser beam emitted by the light source is 395 nm / 405 nm.

8. A sensor based on a phosphorescent coating according to claim 1, characterized in that: The light source is an LED-UV point light source.

9. The sensor based on a phosphorescent coating according to claim 1, characterized in that: The industrial camera is an industrial CMOS micro camera.

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