Multi-channel on-site calibration device for high temperature detection

Abstract

The invention relates to the technical field of multichannel on-site calibration, and provides multichannel on-site calibration equipment for high-temperature detection, which consists of a barrel, a front cover, a rear cover, a focusing structure, a light splitting structure and a detection structure. The equipment adopts a hollow cylinder design, a front cover is tightly connected with one end of the cylinder, and a rear cover is fixed at the other end of the cylinder, so that a complete closed structure is formed. The focusing structure is mounted in the barrel, is connected with the front cover, comprises an objective lens and a focusing lens, and is used for focusing an infrared radiation signal; the light splitting structure is located between the focusing structure and the detection structure and installed in the cylinder through a fixing frame, and multi-channel light splitting measurement is achieved through combination of a reflector and a spectroscope. And the detection structure comprises a plurality of detectors which are collinearly arranged along the rear cover and are used for sequentially detecting infrared signals of different wavebands.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-channel on-site calibration and calibration, and more specifically, to a multi-channel on-site calibration and calibration device for high temperature detection. Background Art

[0002] The commonly used calibration equipment for high temperature detection technology is the standard blackbody source, which can only be measured and calibrated in the laboratory. During on-site measurement, many influencing factors such as the use environment, measurement background, target emissivity, etc., as well as interference factors such as combustion flame turbulence and disturbance, will change, resulting in large measurement deviations. Therefore, a more accurate measuring instrument is needed that can overcome the influence of emissivity changes, realize background compensation and combustion flame disturbance, and is convenient and flexible to use on-site, so as to be used as on-site calibration and verification equipment.

[0003] In order to solve the above problems, a technical solution is now provided. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a multi-channel on-site calibration device for high-temperature detection. By adopting a multi-wavelength narrow-band gating design of an infrared imaging objective, a focusing lens, a flat-plate spectroscope and a high-reflectivity reflector, and combining online correction, comparative measurement algorithms and background compensation models, the influence of transient changes in emissivity and combustion flames is effectively eliminated. With a portable modular structure design, the problem that the standard blackbody source in the prior art can only be measured and calibrated in the laboratory and the on-site measurement error is large is solved, and the device is suitable for precise measurement in complex on-site environments.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A multi-channel on-site calibration device for high temperature detection, comprising a barrel (1), a front cover (2), a rear cover (3), a focusing structure (4), a spectroscopic structure (5) and a detection structure (6), wherein the barrel (1) is a hollow structure; the front cover (2) is fixed to one end of the barrel (1), and the rear cover (3) is fixedly installed on the other end of the barrel (1); the focusing structure (4) is located inside the barrel (1) and is tightly connected to the front cover (2); the focusing structure (4) comprises an objective lens (408) and a focusing lens (405); the spectroscopic structure (5) is fixedly installed by a fixing frame (501) Installed inside the barrel (1), located between the focusing structure (4) and the detection structure (6), the spectroscopic structure (5) comprises a first reflector (504), a first spectroscope (505), a second spectroscope (508) and a second reflector (509); wherein the first reflector (504) is arranged in parallel with the first spectroscope (505), and the second spectroscope (508) is arranged in parallel with the second reflector (509); the detection structure (6) is connected to the back cover (3), and comprises a first detector (602), a second detector (603) and a third detector (604).

[0007] As a further solution of the present invention, the objective lens (408) is an infrared imaging objective lens, and the infrared imaging objective lens has a small field of view, a long focal length and a large back intercept design; the focusing lens (405) has an infrared bandpass filtering function; the first beam splitter (505) is a flat-plate beam splitter with a projection-reflection ratio of 7:3, and the second beam splitter (508) is a flat-plate beam splitter with a head-reflection ratio of 1:1; the first reflector (504) and the second reflector (509) are both high reflectors with a reflectivity of 99.99%; the first detector (602) is an infrared detector with a built-in λ1 narrowband filter, the second detector (603) is an infrared detector with a built-in λ2 narrowband filter, and the third detector (604) is an infrared detector with a built-in λ3 narrowband filter.

[0008] As a further solution of the present invention, the focusing structure (4) includes a push-pull rod (401), a tension spring (402), a sealing ring (403), a first lens barrel (404), a focusing lens (405) and a lens pressure ring (406), wherein the push-pull rod (401) passes through the barrel (1) and the sealing ring (403) and is fixedly connected to the outer surface of the first lens barrel (404), the tension spring (402) is sleeved on the outer periphery of the push-pull rod (401) and is located between the push-pull rod (401) and the sealing ring (403), and the focusing lens (405) is fixed to one end of the first lens barrel (404) through the lens pressure ring (406).

[0009] As a further solution of the present invention, the focusing structure (4) further comprises a second lens barrel (407), an objective lens (408) and a fixing ring (409); the objective lens (408) is fixed to the second lens barrel (407) via the fixing ring (409); one end of the second lens barrel (407) is tightly connected to the front cover (2) via bolts, and the other end is connected to the first lens barrel (404).

[0010] As a further solution of the present invention, the light splitting structure (5) comprises a fixing frame (501), a third lens barrel (502), a first mirror cover (503), a first reflector (504), a first beam splitter (505), a second mirror cover (506), a fourth lens barrel (507), a second beam splitter (508) and a second reflector (509), wherein the fixing frame (501) is installed in the barrel body (1), and the third lens barrel (502), the first mirror cover (503), the first reflector (504), the first beam splitter (505), the second mirror cover (506), the fourth lens barrel (507), the second beam splitter (508) and the second reflector (509) are all placed On the fixed frame (501), the first reflecting mirror (504) and the first beam splitter (505) are located at the far end of the fixed frame (501), the second beam splitter (508) and the second reflecting mirror (509) are located at the near end of the fixed frame (501), the first mirror cover (503) is tightly connected to the third lens barrel (502), the first reflecting mirror (504) is located between the first mirror cover (503) and the third lens barrel (502), the second mirror cover (506) is tightly connected to the fourth lens barrel (507), and the first beam splitter (505) is located between the second mirror cover (506) and the fourth lens barrel (507).

[0011] As a further solution of the present invention, a portion of the detection structure (6) is located inside the cylinder (1), and the other portion extends through the back cover (3) to the outside of the cylinder (1), including a first detector (602), a second detector (603) and a third detector (604), wherein the first detector (602), the second detector (603) and the third detector (604) are arranged in sequence in a colinear manner along the diameter direction of the back cover (3); the back cover (3) is fixedly connected to the first detector (602), the second detector (603) and the third detector (604) through the knob (601).

[0012] As a further solution of the present invention, the detection structure (6) includes a knob (601), a first detector (602), a third mirror cover (608), a fifth lens barrel (609), a fourth mirror cover (610), a lens (607), a compression spring (606) and a placement tube (605); the first detector (602) is installed in the fifth lens barrel (609) through the fourth mirror cover (610); the fifth lens barrel (609) is connected to the third mirror cover (608) through a threaded structure; the third mirror cover (608) is connected to the fourth mirror cover (610) through a threaded structure; the lens (607) is clamped between the third mirror cover (608) and the fifth lens barrel (609); the compression spring (606) is arranged between the lens (607) and the placement tube (605); the placement tube (605) is connected to the compression spring (606).

[0013] Compared with the prior art, the multi-channel on-site calibration device for high temperature detection of the present invention has the following beneficial effects:

[0014] 1. The present invention effectively overcomes the influence of emissivity change and transient change of combustion flame on the measurement results by adopting multi-wavelength narrowband gating technology and contrast measurement algorithm, and introduces background compensation model to eliminate background radiation interference, thus ensuring the accuracy of data in the high temperature detection process. In addition, the infrared imaging objective lens, small field of view, long focal length design and infrared bandpass filtering function of the focusing lens further improve the stability and accuracy of the equipment in complex field environments.

[0015] 2. The portable modular design of the present invention makes the equipment more flexible and convenient in field use, and adapts to the rapid deployment and debugging requirements of different scenarios. Compared with the traditional laboratory calibration method, the present invention can not only realize online calibration, but also adapt to the complex environment and interference factors on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic structural diagram of a multi-channel on-site calibration device for high temperature detection.

[0017] Figure 2 The focusing structure schematic diagram (1) of a multi-channel on-site calibration device for high temperature detection according to the present invention.

[0018] Figure 3 This is a schematic diagram (2) of the focusing structure of a multi-channel on-site calibration device for high-temperature detection according to the present invention.

[0019] Figure 4 The present invention is a schematic diagram of the spectroscopic structure of a multi-channel on-site calibration device for high temperature detection.

[0020] Figure 5 The present invention is a schematic diagram (1) of the detection structure of a multi-channel on-site calibration device for high temperature detection.

[0021] Figure 6 This is a schematic diagram (2) of the detection structure of a multi-channel on-site calibration device for high temperature detection according to the present invention.

[0022] In the figure: 1, barrel; 2, front cover; 3, rear cover; 4, focusing structure; 5, spectroscopic structure; 6, detection structure; 401, push-pull rod; 402, tension spring; 403, sealing ring; 404, first lens barrel; 405, focusing lens; 406, pressure ring; 407, second lens barrel; 408, objective lens; 409, fixing ring; 501, fixing frame; 502, third lens barrel; 503, first lens cover; 504, first reflecting mirror; 505, first spectroscope; 506, second lens cover; 507, fourth lens barrel; 508, second spectroscope; 509, second reflecting mirror; 601, knob; 602, first detector; 603, second detector; 604, third detector; 605, placement barrel; 606, pressure spring; 607, lens; 608, third lens cover; 609, fifth lens barrel; 610, fourth lens cover. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] like Figure 1 The present invention shows a multi-channel on-site calibration device for high temperature detection, comprising a cylinder (1), a front cover (2), a rear cover (3), a focusing structure (4), a spectroscopic structure (5) and a detection structure (6), wherein the cylinder (1) is a hollow structure; the front cover (2) is fixed to one end of the cylinder (1), and the rear cover (3) is fixedly installed on the other end of the cylinder (1); the focusing structure (4) is located inside the cylinder (1) and is tightly connected to the front cover (2); the spectroscopic structure (5) is fixedly installed inside the cylinder (1) and is located between the focusing structure (4) and the detection structure (6); and the detection structure (6) is connected to the rear cover (3).

[0026] The focusing structure (4) in the embodiment of the present invention comprises a push-pull rod (401), a tension spring (402), a sealing ring (403), a first lens barrel (404), a focusing lens (405) and a lens pressure ring (406), wherein the push-pull rod (401) passes through the barrel (1) and the sealing ring (403) and is fixedly connected to the outer surface of the first lens barrel (404); the tension spring (402) is sleeved on the outer periphery of the push-pull rod (401) and is located between the push-pull rod (401) and the sealing ring (403); and the focusing lens (405) is fixed to one end of the first lens barrel (404) through the lens pressure ring (406).

[0027] The focusing structure (4) in the embodiment of the present invention further comprises a second lens barrel (407), an objective lens (408) and a fixing ring (409); the objective lens (408) is fixed to the second lens barrel (407) via the fixing ring (409); one end of the second lens barrel (407) is tightly connected to the front cover (2) via bolts, and the other end is connected to the first lens barrel (404).

[0028] The light splitting structure (5) in the embodiment of the present invention comprises a fixing frame (501), a third lens barrel (502), a first mirror cover (503), a first reflector (504), a first beam splitter (505), a second mirror cover (506), a fourth lens barrel (507), a second beam splitter (508) and a second reflector (509), wherein the fixing frame (501) is installed in the barrel body (1), the third lens barrel (502), the first mirror cover (503), the first reflector (504), the first beam splitter (505), the second mirror cover (506), the fourth lens barrel (507), the second beam splitter (508) and the second reflector (509) are all placed on the fixing frame (501), and the first reflector (504) and the first beam splitter are The first lens cover (503) is tightly connected to the third lens barrel (502), the first reflector (504) is tightly connected to the third lens barrel (502), the second lens cover (506) is tightly connected to the fourth lens barrel (507), the first reflector (504) is parallel to the first lens cover (505), the second lens cover (508) is parallel to the second reflector (509), and the first lens cover (505) is between the second lens cover (506) and the fourth lens barrel (507).

[0029] The detection structure (6) in the embodiment of the present invention has a portion located inside the cylinder (1), and another portion extending through the rear cover (3) to the outside of the cylinder (1), and includes a first detector (602), a second detector (603) and a third detector (604), wherein the first detector (602), the second detector (603) and the third detector (604) are arranged in sequence in a colinear manner along the diameter direction of the rear cover (3); the rear cover (3) is fixedly connected to the first detector (602), the second detector (603) and the third detector (604) via the knob (601).

[0030] The detection structure (6) in the embodiment of the present invention comprises a knob (601), a first detector (602), a third mirror cover (608), a fifth lens barrel (609), a fourth mirror cover (610), a lens (607), a compression spring (606) and a placement tube (605); the first detector (602) is installed in the fifth lens barrel (609) via the fourth mirror cover (610); the fifth lens barrel (609) is connected to the third mirror cover (608) via a threaded structure; the third mirror cover (608) is connected to the fourth mirror cover (610) via a threaded structure; the lens (607) is sandwiched between the third mirror cover (608) and the fifth lens barrel (609); the compression spring (606) is arranged between the lens (607) and the placement tube (605); the placement tube (605) is connected to the compression spring (606).

[0031] The objective lens (408) in the embodiment of the present invention is an infrared imaging objective lens, and the infrared imaging objective lens has a small field of view, a long focal length and a large back intercept design; the focusing lens (405) has an infrared bandpass filtering function; the first beam splitter (505) is a flat plate beam splitter with a projection-reflection ratio of 7:3, and the second beam splitter (508) is a flat plate beam splitter with a head-reflection ratio of 1:1; the first reflector (504) and the second reflector (509) are both high reflectors with a reflectivity of 99.99%; the first detector (602) is an infrared detector with a built-in λ1 narrowband filter, the second detector (603) is an infrared detector with a built-in λ2 narrowband filter, and the third detector (604) is an infrared detector with a built-in λ3 narrowband filter.

[0032] The cylinder (1) in the embodiment of the present invention is used to carry various components inside, forming a closed cavity to protect the internal optical and electronic components and provide structural support; one end of the cylinder is fixedly closed by the front cover (2), and the other end is closed by the rear cover (3), ensuring that the interior of the device is protected from the influence of the external environment while maintaining the stability of the optical system.

[0033] The front cover (2) in the embodiment of the present invention is tightly connected to the focusing structure (4), and the focusing structure (4) is used to focus external infrared signals into the optical system inside the device. The lenses and optical elements inside the focusing structure focus the external infrared radiation and guide it into the spectroscopic structure (5), thereby realizing preliminary processing of the infrared signal.

[0034] The light splitting structure (5) in the embodiment of the present invention is installed inside the cylinder (1) and is located between the focusing structure (4) and the detection structure (6). The light splitting structure (5) decomposes the incoming infrared radiation into signals of different wavelengths through a plurality of reflectors and a light splitter, and accurately guides the signals according to the wavelengths, so that the optical signals can propagate along a predetermined path, thereby ensuring that light of different wavelength bands can be detected by corresponding detectors.

[0035] The detection structure (6) in the embodiment of the present invention is used to receive the optical signal decomposed by the spectroscopic structure. The multiple detectors in the detection structure are arranged along the diameter direction of the back cover so as to be able to detect optical signals of different wavelengths at the same time. After the signals of different wavelengths enter each detector, they are adjusted and corrected in real time through the built-in narrowband filter combined with the multi-wavelength comparison algorithm to realize the online correction function.

[0036] Example 2

[0037] like Figure 2-3 The figure shows a schematic diagram of a focusing structure of a multi-channel on-site calibration device for high temperature detection according to the present invention, wherein the focusing structure (4) comprises a push-pull rod (401), a tension spring (402), a sealing ring (403), a first lens barrel (404), a focusing lens (405), a lens pressing ring (406), a second lens barrel (407), an objective lens (408) and a fixing ring (409), wherein the push-pull rod (401) passes through the barrel (1) and the sealing ring (403) and is fixedly connected to the outer surface of the first lens barrel (404). The tension spring (402) is sleeved on the outer circumference of the push-pull rod (401) and is located between the push-pull rod (401) and the sealing ring (403); the focusing lens (405) is fixed to one end of the first lens barrel (404) through the lens pressing ring (406); the objective lens (408) is fixed to the second lens barrel (407) through the fixing ring (409); one end of the second lens barrel (407) is tightly connected to the front cover (2) through bolts, and the other end is connected to the first lens barrel (404).

[0038] The objective lens (408) in the embodiment of the present invention is an infrared imaging objective lens, which has a small field of view, a long focal length and a large back focus design; the focusing lens (405) has an infrared bandpass filtering function; and the front and rear positions of the focusing lens (405) can be adjusted by operating the push-pull rod (401) to achieve focal length adjustment; the tension spring (402) is used to provide a rebound force to ensure that the push-pull rod can be reset after being pushed and pulled; the sealing ring (403) is located at the connection between the push-pull rod and the cylinder to ensure the internal sealing of the system; the focusing lens (405) is fixed to one end of the first lens barrel (404) through a lens pressing ring (406), and the objective lens (408) is installed on the second lens barrel (407) through a fixing ring (409); one end of the second lens barrel is tightly connected to the front cover (2) through bolts, and the other end is connected to the first lens barrel (404), forming a complete optical path adjustment system; this structural design enables the system to achieve precise optical focusing in a high-temperature environment on site, and at the same time, through the cooperation of sealing and tension springs, the stability and reliability of the system are ensured.

[0039] Example 3

[0040] like Figure 4 The figure shows a schematic diagram of a spectroscopic structure of a multi-channel on-site calibration device for high temperature detection according to the present invention, wherein the spectroscopic structure (5) comprises a fixing frame (501), a third lens barrel (502), a first mirror cover (503), a first reflector (504), a first beam splitter (505), a second mirror cover (506), a fourth lens barrel (507), a second beam splitter (508) and a second reflector (509), wherein the fixing frame (501) is installed in a barrel body (1), and the third lens barrel (502), the first mirror cover (503), the first reflector (504), the first beam splitter (505), the second mirror cover (506), the fourth lens barrel (507), the second beam splitter (508) and the second reflector (509) are installed in a barrel body (1). The reflecting mirrors (509) are all placed on the fixing frame (501), the first reflecting mirror (504) and the first beam splitter (505) are located at the far end of the fixing frame (501), the second beam splitter (508) and the second reflecting mirror (509) are located at the near end of the fixing frame (501), the first mirror cover (503) is tightly connected to the third lens barrel (502), the first reflecting mirror (504) is located between the first mirror cover (503) and the third lens barrel (502), the second mirror cover (506) is tightly connected to the fourth lens barrel (507), and the first beam splitter (505) is located between the second mirror cover (506) and the fourth lens barrel (507).

[0041] The first beam splitter (505) in the embodiment of the present invention is a flat beam splitter with a projection-reflection ratio of 7:3, and the second beam splitter (508) is a flat beam splitter with a head-reflection ratio of 1:1; the first reflector (504) and the second reflector (509) are both high reflectors with a reflectivity of 99.99%; the first reflector (504) is used to reflect an incident light beam; the reflected light beam is sequentially subjected to preliminary beam splitting by the first beam splitter (505) to achieve separation of light of different wavelengths; then, the beam splitting is further processed by the second beam splitter (508) and the second reflector (509) to achieve the function of re-splitting and reflecting; this beam splitting structure selects and filters narrowband signals of multiple wavelengths through arranged reflectors and beam splitters, thereby achieving multi-wavelength narrowband gating, ensuring accurate detection of different wavelengths, and ensuring that the multi-channel infrared detector receives accurate light signals during high temperature detection.

[0042] Example 4

[0043] like Figure 5-6 The present invention is a schematic diagram of a detection structure of a multi-channel on-site calibration device for high temperature detection, wherein a portion of the detection structure (6) is located inside a cylinder (1), and another portion thereof passes through a rear cover (3) and extends to the outside of the cylinder (1), and the detection structure (6) comprises a knob (601), a first detector (602), a third lens cover (608), a fifth lens barrel (609), a fourth lens cover (610), a lens (607), a compression spring (606) and a placement barrel (605); the first detector (602) is installed in the fifth lens barrel (609) through the fourth lens cover (610), and the fifth lens barrel (609) is connected to the third lens cover (608) through a threaded structure. The third mirror cover (608) is connected to the fourth mirror cover (610) via a threaded structure; the lens (607) is clamped between the third mirror cover (608) and the fifth lens barrel (609); the compression spring (606) is arranged between the lens (607) and the placement barrel (605), and the placement barrel (605) is connected to the compression spring (606); the first detector (602), the second detector (603) and the third detector (604) are arranged in sequence in a colinear manner along the diameter direction of the rear cover (3); and the rear cover (3) is fixedly connected to the first detector (602), the second detector (603) and the third detector (604) via the knob (601).

[0044] The first detector (602) in the embodiment of the present invention is an infrared detector with a λ1 narrowband filter, the second detector (603) is an infrared detector with a λ2 narrowband filter, and the third detector (604) is an infrared detector with a λ3 narrowband filter; the lens (607) is used to process and adjust the light beam passing through to ensure the accuracy of the signal; the compression spring (606) provides necessary elastic support to avoid the influence of mechanical vibration on the optical path and detection accuracy; the first detector (602), the second detector (603) and the third detector (604) are arranged in a colinear manner along the diameter direction of the back cover (3), so that the detectors can capture light signals of different wavelengths at the same time, ensuring the effectiveness of multi-wavelength detection; the knob (601) is used to fix the detector so that it is tightly connected to the back cover (3) and ensure that the position of the detector does not change during the detection process.

[0045] The detection structure (6) in the embodiment of the present invention further processes the signal through a narrowband filter built into the detector, and by comparing multi-wavelength data, it is able to determine the errors caused by changes in the target object's emissivity and transient changes in the combustion flame; this comparative measurement algorithm relies on accurate data at different wavelengths, thereby eliminating measurement errors caused by combustion flame disturbances and emissivity changes.

[0046] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0047] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-channel on-site calibration device for high temperature detection, comprising a barrel (1), a front cover (2), a rear cover (3), a focusing structure (4), a spectroscopic structure (5) and a detection structure (6), characterized in that: The barrel (1) is a hollow structure; the front cover (2) is fixed to one end of the barrel (1), and the rear cover (3) is fixedly installed on the other end of the barrel (1); the focusing structure (4) is located inside the barrel (1) and is tightly connected to the front cover (2), and the focusing structure (4) includes an objective lens (408) and a focusing lens (405); the light splitting structure (5) is fixedly installed inside the barrel (1) through a fixing frame (501), and is located between the focusing structure (4) and the detection structure (6). The light splitting structure (5) comprises a first reflector (504), a first beam splitter (505), a second beam splitter (508) and a second reflector (509); wherein the first reflector (504) is arranged in parallel with the first beam splitter (505), and the second beam splitter (508) is arranged in parallel with the second reflector (509); and the detection structure (6) is connected to the back cover (3), and comprises a first detector (602), a second detector (603) and a third detector (604).

2. A multi-channel on-site calibration device for high temperature detection according to claim 1, characterized in that: The objective lens (408) is an infrared imaging objective lens, and the infrared imaging objective lens has a small field of view, a long focal length and a large back intercept design; the focusing lens (405) has an infrared bandpass filtering function; the first beam splitter (505) is a flat beam splitter with a projection-reflection ratio of 7:3, and the second beam splitter (508) is a flat beam splitter with a head-reflection ratio of 1:1; the first reflector (504) and the second reflector (509) are both high reflectors with a reflectivity of 99.99%; the first detector (602) is an infrared detector with a built-in λ1 narrowband filter, the second detector (603) is an infrared detector with a built-in λ2 narrowband filter, and the third detector (604) is an infrared detector with a built-in λ3 narrowband filter.

3. The multi-channel on-site calibration equipment for high temperature detection according to claim 1, characterized in that: The focusing structure (4) comprises a push-pull rod (401), a tension spring (402), a sealing ring (403), a first lens barrel (404), a focusing lens (405) and a lens pressure ring (406), wherein the push-pull rod (401) passes through the barrel (1) and the sealing ring (403) and is fixedly connected to the outer surface of the first lens barrel (404); the tension spring (402) is sleeved on the outer periphery of the push-pull rod (401) and is located between the push-pull rod (401) and the sealing ring (403); and the focusing lens (405) is fixed to one end of the first lens barrel (404) via the lens pressure ring (406).

4. A multi-channel on-site calibration device for high temperature detection according to claim 1 or 3, characterized in that: The focusing structure (4) further comprises a second lens barrel (407), an objective lens (408) and a fixing ring (409); the objective lens (408) is fixed to the second lens barrel (407) via the fixing ring (409); one end of the second lens barrel (407) is tightly connected to the front cover (2) via bolts, and the other end is connected to the first lens barrel (404).

5. The multi-channel on-site calibration equipment for high temperature detection according to claim 1, characterized in that: The light splitting structure (5) comprises a fixing frame (501), a third lens barrel (502), a first lens cover (503), a first reflector (504), a first beam splitter (505), a second lens cover (506), a fourth lens barrel (507), a second beam splitter (508) and a second reflector (509), wherein the fixing frame (501) is installed in the barrel body (1), and the third lens barrel (502), the first lens cover (503), the first reflector (504), the first beam splitter (505), the second lens cover (506), the fourth lens barrel (507), the second beam splitter (508) and the second reflector (509) are all placed on the fixing frame ( The first reflector (504) and the first beam splitter (505) are located at the far end of the fixing frame (501), the second beam splitter (508) and the second reflector (509) are located at the near end of the fixing frame (501), the first mirror cover (503) is tightly connected to the third lens barrel (502), the first reflector (504) is located between the first mirror cover (503) and the third lens barrel (502), the second mirror cover (506) is tightly connected to the fourth lens barrel (507), and the first beam splitter (505) is located between the second mirror cover (506) and the fourth lens barrel (507).

6. The multi-channel on-site calibration equipment for high temperature detection according to claim 1, characterized in that: A portion of the detection structure (6) is located inside the cylinder (1), and another portion extends through the rear cover (3) to the outside of the cylinder (1), and comprises a first detector (602), a second detector (603) and a third detector (604), wherein the first detector (602), the second detector (603) and the third detector (604) are arranged in sequence in a colinear manner along the diameter direction of the rear cover (3); the rear cover (3) is fixedly connected to the first detector (602), the second detector (603) and the third detector (604) via the knob (601).

7. A multi-channel on-site calibration device for high temperature detection according to claim 1 or 6, characterized in that: The detection structure (6) comprises a knob (601), a first detector (602), a third lens cover (608), a fifth lens barrel (609), a fourth lens cover (610), a lens (607), a compression spring (606) and a placement tube (605); the first detector (602) is installed in the fifth lens barrel (609) via the fourth lens cover (610); the fifth lens barrel (609) is connected to the third lens cover (608) via a threaded structure; the third lens cover (608) is connected to the fourth lens cover (610) via a threaded structure; the lens (607) is sandwiched between the third lens cover (608) and the fifth lens barrel (609); the compression spring (606) is arranged between the lens (607) and the placement tube (605); the placement tube (605) is connected to the compression spring (606).

Images