A length adjustable infrared probe for remote measurement of a combustion system

Abstract

The application provides a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs to the field of infrared measurement. The application discloses a length-adjustable infrared probe for long-distance measurement of a combustion system, and belongs

Description

Technical Field

[0001] This invention belongs to the field of infrared measurement technology, and in particular relates to an adjustable-length infrared probe for long-distance measurement of combustion systems. Background Technology

[0002] Key components in large combustion systems such as power plant boilers and gas turbines operate under complex and extreme environments for extended periods. They are susceptible to damage from the erosion caused by the high-temperature pulses of turbulent flames, affecting the safe and stable operation of the entire equipment. Therefore, the surface temperature of key hot-end components within the combustion system is a crucial monitoring indicator. However, in practice, constraints imposed by environmental factors such as temperature, pressure, dust, and measurement distance present certain challenges to the technology for monitoring the surface temperature of key components in large combustion systems.

[0003] Traditional contact temperature measurement methods are no longer suitable for such complex operating conditions. While adaptable non-contact infrared temperature measurement methods, especially for long-distance measurements, encounter various interference signals along the radiation signal propagation path, increasing the difficulty for infrared thermometers to extract useful signals. Furthermore, infrared measuring devices require room temperature or even lower temperatures to achieve high sensitivity, necessitating installation away from the combustion system. This detached installation method increases the complexity and uncertainty of the entire system.

[0004] Therefore, there is an urgent need for an adjustable, integrated, high-temperature resistant, and cooled probe that can be assembled with a combustion system. In response to the fire environment inside the combustion system, an assembleable, cooled, and length-adjustable probe is introduced as a directional transmission path for radiation signals. A simple optical system is used to record and focus the light of the measurement space process, so as to meet the needs of long-distance accurate positioning and telemetry while withstanding the corrosion of high-temperature environments. Summary of the Invention

[0005] In view of this, in order to solve the problem of multiple interference signals in the long-distance measurement of the surface temperature of key hot-end components in complex and extreme environments in large combustion systems, and the problem that high-temperature intolerant infrared temperature measuring devices need to be installed in a free manner, which increases the complexity and uncertainty of the system, this invention proposes an adjustable-length infrared probe for long-distance measurement of combustion systems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An adjustable-length infrared probe for long-range measurement in a combustion system, comprising:

[0008] Infrared thermometer;

[0009] The telescopic lens tube has one end connected to an infrared thermometer. The radiation signal of the target can be focused onto the lens of the infrared thermometer through the telescopic lens tube. The end of the telescopic lens tube away from the infrared thermometer is equipped with a window, and the distance between the window of the telescopic lens tube and the lens of the infrared thermometer can be adjusted.

[0010] The telescopic cooling sleeve contains the entire telescopic lens barrel. One end of the telescopic cooling sleeve can be connected to an infrared thermometer. The telescopic cooling sleeve has a cooling chamber. The end of the telescopic cooling sleeve closest to the infrared thermometer has a cooling medium inlet, and the end of the telescopic cooling sleeve furthest from the infrared thermometer has multiple cooling medium outlets at intervals. The cooling medium inlet, cooling chamber, and cooling medium outlets are connected in sequence. The cooling medium discharged from the cooling medium outlets can form an air film layer outside the window of the telescopic lens barrel.

[0011] As a preferred embodiment of the aforementioned adjustable-length infrared probe for long-distance measurement of combustion systems, the retractable lens tube includes a first lens tube, a second lens tube, and a third lens tube. One end of the first lens tube is provided with the window, and the other end is provided with a first internal thread. One end of the second lens tube is provided with a first external thread, and the other end is provided with a second internal thread. One end of the third lens tube can be connected to the infrared thermometer, and the other end is provided with a second external thread. The first internal thread is screwed into the first external thread, and the second internal thread is screwed into the second external thread. A condenser is fixedly provided inside the first lens tube, a collimator is fixedly provided inside the second lens tube, and a meniscus is fixedly provided inside the third lens tube.

[0012] As a preferred embodiment of the aforementioned length-adjustable infrared probe for long-distance measurement of a combustion system, the first external thread of the second lens barrel is provided with a plurality of first scale lines, which are spaced apart along the axial direction; the second external thread of the third lens barrel is provided with a plurality of second scale lines, which are spaced apart along the axial direction.

[0013] As a preferred embodiment of the aforementioned adjustable-length infrared probe for long-distance measurement of combustion systems, one end of the third lens tube is provided with a connection hole, and the lens of the infrared thermometer is snapped into the connection hole.

[0014] As a preferred embodiment of the aforementioned adjustable infrared probe for long-distance measurement of combustion systems, the retractable cooling sleeve includes a front cooling sleeve and a rear cooling sleeve. One end of the rear cooling sleeve can be connected to the infrared thermometer, and the other end is provided with a third internal thread. The front cooling sleeve is provided with a third external thread, and the third external thread is screwed into the third internal thread.

[0015] As a preferred embodiment of the aforementioned adjustable infrared probe for long-distance measurement of combustion systems, the third external thread is provided with multiple third scale lines, which are spaced apart along the axial direction.

[0016] As a preferred embodiment of the aforementioned length-adjustable infrared probe for long-distance measurement of the combustion system, one end of the rear cooling sleeve is connected to the infrared thermometer via a fixing pin.

[0017] As a preferred embodiment of the aforementioned adjustable infrared probe for long-distance measurement of the combustion system, the front cooling sleeve includes a first sleeve and a second sleeve. One end of the first sleeve is connected to the rear cooling sleeve, and the other end is fixedly connected to the second sleeve. The second sleeve is inclined inward relative to the first sleeve.

[0018] As a preferred embodiment of the aforementioned length-adjustable infrared probe for long-distance measurement of the combustion system, it further includes a fixing ring located between the front cooling sleeve and the retractable cooling sleeve, with both ends of the fixing ring abutting against the front cooling sleeve and the retractable cooling sleeve, respectively.

[0019] As a preferred embodiment of the aforementioned length-adjustable infrared probe for long-distance measurement of combustion systems, the retaining ring is made of rubber material.

[0020] Compared with existing technologies, the advantages of the adjustable-length infrared probe for long-distance measurement in combustion systems provided by this invention are:

[0021] This invention provides an adjustable-length infrared probe for long-distance measurement of combustion systems. This probe, applied to long-distance infrared thermometry of large combustion systems, is fixedly assembled to the combustion system via a perforated method. The radiation signal from the target is focused onto the lens of an infrared thermometer through a retractable lens barrel. This, combined with a simplified optical path through the long-distance probe, reduces interference from unwanted signals in the signal propagation path, enabling precise long-distance positioning and telemetry of key hot-end components within large combustion systems. The distance between the window of the retractable lens barrel and the lens of the infrared thermometer is adjustable, allowing for micro-distance adjustments even with a fixed probe installation. The entire cylinder is located within the retractable cooling sleeve, where a cooling medium flows within the cooling chamber. This cooling sleeve can withstand high-temperature corrosion of approximately 1000℃ in harsh working environments, providing a suitable working environment for the retractable telescope and infrared thermometer. Simultaneously, the cooling medium exits from the cooling medium outlet after passing through the cooling chamber. The exited cooling medium forms a thin gas film layer on the outside of the window of the retractable telescope, which further protects the window and also prevents dust contamination. Thus, this cooling sleeve can provide a suitable working environment for the retractable telescope and infrared thermometer in harsh environments with high temperature, high pressure, and high dust, ensuring the safe and stable operation of the equipment. Furthermore, the length of the cooling sleeve can be adjusted according to the required measurement distance. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of an adjustable-length infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention;

[0024] Figure 2 This is a cross-sectional view of the rear cooling sleeve of an adjustable infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the first lens tube of an adjustable infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the second lens tube of an adjustable infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the third lens tube of an adjustable infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the structure of the window of an adjustable-length infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the focusing sheet of the length-adjustable infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the collimation plate of an adjustable-length infrared probe for long-distance measurement of a combustion system, provided in a specific embodiment of the present invention.

[0031] Figure 9 This is a schematic diagram of the structure of a length-adjustable infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of the structure of the length-adjustable infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention when L7 is at its maximum.

[0033] Figure 11This is a schematic diagram of the structure of the adjustable infrared probe for long-distance measurement of a combustion system provided in a specific embodiment of the present invention when L7 is at its minimum.

[0034] Figure 12 This is a schematic diagram of the transfer function (MIF) at infinity when L7 = 1010 mm in a length-adjustable infrared probe for long-distance measurement of a combustion system, provided in a specific embodiment of the present invention.

[0035] Figure 13 This is a partial image of the image plane (RMS) of an adjustable infrared probe used for long-distance measurement of a combustion system under five selectable measurement distances provided in a specific embodiment of the present invention.

[0036] In the picture:

[0037] 11. Front cooling sleeve; 12. Rear cooling sleeve; 13. Cooling medium inlet; 14. Cooling medium outlet; 15. Cooling chamber;

[0038] 21. First tube; 22. Second tube; 23. Third tube;

[0039] 31. Window lens; 32. Condenser lens; 33. Collimator lens; 34. Meniscus lens;

[0040] 4. The target to be tested;

[0041] 5. Infrared thermometer; 51. Lens;

[0042] 6. Retaining ring;

[0043] 7. Fixing pin. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0045] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0048] See Figure 1-13 This invention provides an adjustable-length infrared probe for long-distance measurement of a combustion system. The probe includes a retractable lens tube, a retractable cooling sleeve, and an infrared thermometer 5. One end of the retractable lens tube is connected to the infrared thermometer 5. The radiation signal from the target 4 can be focused onto the lens 51 of the infrared thermometer 5 through the retractable lens tube. A window 31 is provided at the end of the retractable lens tube away from the infrared thermometer 5. The distance between the window 31 of the retractable lens tube and the lens 51 of the infrared thermometer 5 is... The distance is adjustable; the entire telescopic lens barrel is located inside the telescopic cooling sleeve. One end of the telescopic cooling sleeve can be connected to the infrared thermometer 5. The telescopic cooling sleeve is provided with a cooling cavity 15. The end of the telescopic cooling sleeve closer to the infrared thermometer 5 is provided with a cooling medium inlet 13. The end of the telescopic cooling sleeve away from the infrared thermometer 5 is provided with multiple cooling medium outlets 14 at intervals. The cooling medium inlet 13, the cooling cavity 15 and the cooling medium outlets 14 are connected in sequence. The cooling medium discharged from the cooling medium outlets 14 can form an air film layer outside the window 31 of the telescopic lens barrel.

[0049] This adjustable-length infrared probe for long-distance measurement of combustion systems is applied in the field of long-distance infrared temperature measurement of large combustion systems. The probe is fixed to the combustion system via a perforated mounting method. The radiation signal from the target 4 is focused onto the lens 51 of the infrared thermometer 5 through a retractable lens tube. Combined with a simplified optical path through the long-distance probe, interference from unwanted signals in the measurement signal propagation path is reduced, enabling remote and precise positioning of key hot-end components within large combustion systems. The distance between the window 31 of the retractable lens tube and the lens 51 of the infrared thermometer 5 is adjustable, allowing for micro-distance adjustments under fixed probe mounting conditions. The entire retractable lens tube is located within a retractable cooling sleeve. The cooling chamber 15 of the cylinder contains a cooling medium flowing through it. This cooling sleeve can withstand high-temperature corrosion of about 1000℃ in harsh working environments, providing a suitable working environment for the telescopic lens tube and the infrared thermometer 5. At the same time, after passing through the cooling chamber 15, the cooling medium is discharged from the cooling medium outlet 14. The discharged cooling medium can form a thin gas film layer on the outside of the window 31 of the telescopic lens tube. This gas film layer has a further protective effect on the window 31 and also has the function of preventing dust pollution. Thus, the cooling sleeve can provide a suitable working environment for the telescopic lens tube and the infrared thermometer 5 in harsh environments with high temperature, high pressure and lots of dust, ensuring the safe and stable operation of the equipment. At the same time, the length of the cooling sleeve can be adjusted according to the required measurement distance.

[0050] Optionally, the telescopic lens barrel includes a first lens barrel 21, a second lens barrel 22, and a third lens barrel 23. One end of the first lens barrel 21 is provided with the window 31, and the other end is provided with a first internal thread. One end of the second lens barrel 22 is provided with a first external thread, and the other end is provided with a second internal thread. One end of the third lens barrel 23 can be connected to the infrared thermometer 5, and the other end is provided with a second external thread. The first internal thread is screwed into the first external thread, and the second internal thread is screwed into the second external thread. A condenser 32 is fixedly provided inside the first lens barrel 21, a collimator 33 is fixedly provided inside the second lens barrel 22, and a meniscus lens 34 is fixedly provided inside the third lens barrel 23.

[0051] The radiation signal of the target 4 passes through the window 31, the focusing plate 32, the collimating plate 33 and the meniscus 34 in sequence, and finally converges onto the lens 51 of the infrared measuring instrument.

[0052] The window 31 is a sapphire plane mirror with high transmittance for mid-infrared light in the 2-5μm band and high hardness, making it highly adaptable to the harsh environment of the combustion system and protecting subsequent lenses. The condenser 32 is a germanium-zinc sulfide double-clad meniscus lens 34 with its convex surface facing the object to be measured, which has high transmittance for mid-infrared light in the 2-5μm band and serves to converge light and extend the optical path. The collimator 33 is a germanium-zinc sulfide double-clad meniscus lens with its convex surface facing the target 4, which has high transmittance for mid-infrared light in the 2-5μm band and serves to collimate light and extend the optical path. The meniscus lens 34 is a sapphire meniscus lens with its convex surface facing the target 4, which has high transmittance for mid-infrared light in the 2-5μm band and serves to converge light onto the lens of the infrared measuring instrument.

[0053] The specific parameters of the window lens 31, condenser lens 32, collimator lens 33, and meniscus lens 34 are shown in Table 1.

[0054] Table 1. Specific parameters of the lenses

[0055]

[0056] The first lens tube 21 is used to fix the window 31 and the condenser 32. The window 31 is assembled at the left end opening of the first lens tube 21. The front edge of the window 31 is L1 away from the target 4 to be measured, and the rear edge of the window 31 is L2 away from the front edge of the condenser 32.

[0057] The second lens barrel 22 is used to fix the collimator 33, and the leading edge of the collimator 33 is L3 away from the trailing edge of the condenser 32 assembled in the first lens barrel 21.

[0058] The third lens barrel 23 is used to fix the meniscus lens 34. The front edge of the meniscus lens 34 is L4 away from the rear edge of the collimator 33 mounted on the second lens barrel 22, and the rear edge of the meniscus lens 34 is L5 away from the front edge of the lens 51 of the infrared thermometer 5.

[0059] L1, L2, and L5 are fixed lengths: L1 = 550mm, L2 = 300mm, and L5 = 20mm. The first lens barrel 21 and the second lens barrel 22 are assembled via a first internal thread and a first external thread, which adjust the distance between the collimator 33 and the condenser 32. The second lens barrel 22 and the third lens barrel 23 are assembled via a second internal thread and a second external thread, which adjust the distance between the meniscus lens 34 and the collimator 33. The distance L7 between the target 4 and the lens of the infrared thermometer 5 has five options: 970mm, 980mm, 990mm, 1000mm, and 1010mm.

[0060] Optionally, the second lens barrel 22 has a plurality of first scale lines on its first external thread, which are spaced apart axially; the third lens barrel 23 has a plurality of second scale lines on its second external thread, which are spaced apart axially. The length of the telescopic lens barrel can be adjusted simply by rotating the internal and external threads to the corresponding scale lines.

[0061] In this embodiment, the first external thread of the second lens barrel 22 has five first scale lines from left to right, representing five length options for L3: 85mm, 80mm, 75mm, 65mm, and 60mm; the second external thread of the third lens barrel 23 has four second scale lines from left to right, representing four length options for L4: 22mm, 27mm, 32mm, and 37mm.

[0062] In this embodiment, as Figure 3 As shown, the first lens tube 21 is made of a circular stainless steel tube with a specification of Φ20 and a total length of 353mm. A hole with a diameter of 12.5mm is bored at the left end for mounting the window slab 31, and a 45mm long M16×1 internal thread is machined at the right end as the first internal thread.

[0063] like Figure 4 As shown, the second lens tube 22 is made of a circular stainless steel tube with a specification of Φ18×2 and a total length of 71mm. A section of M16×1 external thread with a length of 45mm is machined on the left end as the first external thread, and a section of M14×1 internal thread with a length of 20mm is machined on the other end as the second internal thread.

[0064] like Figure 5 As shown, the third lens tube 23 is made of a circular stainless steel tube with a specification of Φ14×2 and a total length of 42mm. A 20mm long M14×1 external thread is machined on the left end as the second external thread, and a Φ12 blind hole with a depth of 2mm is opened on the right end as a connecting hole for assembling the lens 51 of the infrared measuring instrument.

[0065] Optionally, one end of the third lens tube 23 is provided with a connection hole, and the lens 51 of the infrared thermometer 5 is snapped into the connection hole.

[0066] Optionally, the retractable cooling sleeve includes a front cooling sleeve 11 and a rear cooling sleeve 12. One end of the rear cooling sleeve 12 can be connected to the infrared thermometer 5, and the other end is provided with a third internal thread. The front cooling sleeve 11 is provided with a third external thread, which is screwed into the third internal thread. The front cooling sleeve 11 is provided with an M8×5 third external thread with a length of 100mm, and the rear cooling sleeve 12 is provided with an M8×5 third internal thread with a length of 100mm, and a Φ27×1 circular stainless steel tube is welded on as a cooling medium inlet 13.

[0067] Optionally, the third external thread is provided with multiple third scale lines, which are spaced apart along the axial direction. The third external thread is marked with five third scale lines, which represent five options for the distance L6 from the front end of the front cooling sleeve 11 to the leading edge of the lens 51 of the infrared measuring instrument: 446mm, 456mm, 466mm, 476mm, and 486mm. The distance L6 is selected based on L7.

[0068] The length of the telescopic cooling sleeve can be adjusted via the third internal thread and the third external thread, enabling the adjustment of the distance L6 between the leading edge of the front cooling sleeve 11 and the leading edge of the infrared measuring instrument lens 51, and the distance L7 between the target 4 and the infrared measuring instrument lens 51. Depending on the measurement requirements, the adjustable range of L6 is 466±20mm, and the adjustable range of L7 is 990±20mm. Specific adjustment methods are shown in Table 2. This avoids the problem of repeated disassembly and assembly between the probe device and the combustion system, and between the probe device and the infrared measuring instrument.

[0069] Table 2. Adjustable Probe Length Selection Method

[0070]

[0071] The front cooling sleeve 11 and the rear cooling sleeve 12 are connected by a third internal thread and a third external thread to form the entire telescopic cooling sleeve, the length of which can be adjusted according to the selected sizes L6 and L7. This telescopic cooling sleeve can withstand the heat radiation from high-temperature flue gas and flames at around 1000℃, providing a suitable working environment of 80-100℃ for the optical components inside the probe. The cooling medium discharged from the cooling medium outlet 14 can provide gas film cooling protection for the window 31 assembled at the left end opening of the first lens barrel 21, and also play a role in blowing away dust.

[0072] Optionally, the front cooling sleeve 11 includes a first sleeve and a second sleeve. One end of the first sleeve is connected to the rear cooling sleeve 12, and the other end is fixedly connected to the second sleeve. The second sleeve is inclined inward relative to the first sleeve. This allows the gas discharged from the cooling medium outlet 14 to converge in front of the window slab 31.

[0073] Optionally, one end of the rear cooling sleeve 12 is connected to the infrared thermometer 5 via a fixing pin 7. The rear cooling sleeve 12 is assembled with the infrared thermometer housing via the fixing pin 7, and four positioning holes are bored at 90° intervals at the bottom of the rear cooling sleeve 12 for mounting the fixing pin 7.

[0074] Optionally, the length-adjustable infrared probe for long-distance measurement of the combustion system also includes a retaining ring 6. The retaining ring 6 is located between the front cooling sleeve 11 and the telescopic cooling sleeve, with both ends of the retaining ring 6 abutting against the front cooling sleeve 11 and the telescopic cooling sleeve, respectively. The front cooling sleeve 11 and the first lens barrel 21 are assembled via the retaining rings 6. There are six retaining rings 6 in total, installed sequentially at 50mm intervals, serving to support the telescopic lens barrel.

[0075] Optionally, the retaining ring 6 is made of rubber material.

[0076] like Figure 10 As shown, the measured distance L7 is at its maximum value of 1010mm. According to the parameters in Table 2, the lengths of L3 and L4 need to be adjusted to 85mm and 37mm respectively. Rotate the internal and external threads between the first lens barrel 21 and the second lens barrel 22 to the first first scale line (the first scale line counting from left to right) at the first external thread of the second lens barrel 22. Then rotate the internal and external threads between the second lens barrel 22 and the third lens barrel 23 to the first second scale line (the second scale line counting from left to right) at the second external thread of the third lens barrel 23.

[0077] like Figure 11 As shown, the measured distance L7 is at its minimum value of 970mm. According to the parameters in Table 2, the lengths of L3 and L4 need to be adjusted to 60mm and 22mm respectively. Rotate the internal and external threads between the first lens barrel 21 and the second lens barrel 22 to the fifth first graduation line (the fifth first graduation line from left to right) at the first external thread of the second lens barrel 22. Then, rotate the internal and external threads between the second lens barrel 22 and the third lens barrel 23 to the fourth second graduation line (the fourth second graduation line from left to right) at the second external thread of the third lens barrel 23.

[0078] like Figure 12 As shown, this is the transfer function (MIF) graph of the entire optical system of the probe at infinity when the maximum measurement distance L7 = 1010 mm.

[0079] like Figure 13 As shown, the image plane spot (RMS) results of the entire probe optical system are displayed at five selectable measurement distances that allow for fine-tuning of the distance.

[0080] Obviously, the above-disclosed embodiments of the present invention are merely illustrative of the invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. It is neither necessary nor possible to exhaustively describe all embodiments herein.

Claims

1. A length-adjustable infrared probe for remote measurement of a combustion system, characterized in that The application relates to an infrared thermometer (5) and a telescopic cooling sleeve. The telescopic lens barrel is connected with the infrared thermometer (5) at one end, the radiation signal of a target (4) to be measured can be converged on a lens (51) of the infrared thermometer (5) through the telescopic lens barrel, and a window sheet (31) is arranged at the other end of the telescopic lens barrel away from the infrared thermometer (5); the distance between the window sheet (31) of the telescopic lens barrel and the lens (51) of the infrared thermometer (5) can be adjusted. The telescopic lens barrel is connected with the infrared thermometer (5) at one end, the radiation signal of a target (4) to be measured can be converged on a lens (51) of the infrared thermometer (5) through the telescopic lens barrel, and a window sheet (31) is arranged at the other end of the telescopic lens barrel away from the infrared thermometer (5); the distance between the window sheet (31) of the telescopic lens barrel and the lens (51) of the infrared thermometer (5) can be adjusted. The telescopic cooling sleeve comprises a front section cooling sleeve (11) and a rear section cooling sleeve (12), one end of the rear section cooling sleeve (12) is connected with the infrared thermometer (5), the other end of the rear section cooling sleeve (12) is provided with a third internal thread, and the front section cooling sleeve (11) is provided with a third external thread which is screwed with the third internal thread.

2. The remotely measured, length adjustable, infrared probe for combustion systems of claim 1, wherein: The third external thread is provided with a plurality of third scale lines which are arranged at intervals along the axial direction.

3. The remotely measured, length adjustable, infrared probe for combustion systems of claim 2, wherein: One end of the rear section cooling sleeve (12) is connected with the infrared thermometer (5) through a fixing pin (7).

4. The length adjustable, remotely measured, infrared probe for combustion systems of claim 2, wherein: The front section cooling sleeve (11) comprises a first section sleeve and a second section sleeve, one end of the first section sleeve is connected with the rear section cooling sleeve (12), the other end of the first section sleeve is fixedly connected with the second section sleeve, and the second section sleeve is arranged to be inclined inward relative to the first section sleeve.

5. The length adjustable, remotely measured, infrared probe for combustion systems of claim 1, wherein: ​ 6. The remotely measured, length adjustable, infrared probe for combustion systems of claim 5, wherein: ​ 7. The length adjustable, remotely measured, infrared probe for combustion systems of claim 5, wherein: ​ 8. The length adjustable, remotely measured, infrared probe for combustion systems of claim 5, wherein: ​ 9. The length adjustable, remotely measured, infrared probe for combustion systems of claim 5, wherein: Further comprising a fixing ring (6), the fixing ring (6) is located between the front section cooling sleeve (11) and the telescopic cooling sleeve, and the two ends of the fixing ring (6) are respectively in abutment with the front section cooling sleeve (11) and the telescopic cooling sleeve.

10. The remotely measured, length adjustable, infrared probe for combustion systems of claim 9, wherein: The fixing ring (6) is made of rubber material.

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