CN114199382A - Infrared temperature measurement lens and temperature measurement method - Google Patents
Infrared temperature measurement lens and temperature measurement method Download PDFInfo
- Publication number
- CN114199382A CN114199382A CN202111537881.7A CN202111537881A CN114199382A CN 114199382 A CN114199382 A CN 114199382A CN 202111537881 A CN202111537881 A CN 202111537881A CN 114199382 A CN114199382 A CN 114199382A
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- Prior art keywords
- lens
- detector
- infrared
- optical axis
- diaphragm
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- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 6
- 230000005855 radiation Effects 0.000 claims abstract description 10
- 238000003384 imaging method Methods 0.000 claims abstract description 4
- 230000003287 optical effect Effects 0.000 claims description 24
- 239000005083 Zinc sulfide Substances 0.000 claims description 14
- 229910052732 germanium Inorganic materials 0.000 claims description 14
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 14
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 14
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000007747 plating Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0806—Focusing or collimating elements, e.g. lenses or concave mirrors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0831—Masks; Aperture plates; Spatial light modulators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Abstract
The invention provides an infrared temperature measurement lens, wherein a high-temperature film is plated on a lens close to a diaphragm, and the lens sequentially comprises a first lens with positive or negative diopter, a second lens with negative diopter, a third lens with positive diopter and an aperture diaphragm from an object space to an imaging space. According to the invention, the high-temperature film is plated on the surface of the lens, and the infrared temperature measuring lens with the rear diaphragm is adopted, so that compared with the prior art, an iris diaphragm does not need to be arranged between the lenses, the high-temperature film plated lenses are used for realizing effective high-temperature test, and the infrared temperature measuring lens with the rear diaphragm is adopted, so that all light rays entering the detector are limited, the probability that stray radiation in front of the diaphragm enters the detector is reduced, and the proportion of the effective light rays entering the detector is improved.
Description
Technical Field
The invention relates to a long-wave uncooled infrared temperature measuring lens with a rear diaphragm, in particular to an infrared temperature measuring lens which can be widely applied to the field of temperature measurement and indoor monitoring, and belongs to the technical field of optical lenses.
Background
With the rapid development of the infrared imaging technology and the maturity of the uncooled detector technology, the long-wave uncooled optical system is more and more widely applied. Since the specifications of consumer electronics are changing day by day, temperature measurement products are also more and more widely required for the temperature measurement range and the temperature measurement capability of the lens to meet the requirements of consumers. To ensure the temperature measurement performance, the infrared optical system is usually required to use a large aperture to increase the energy received by the detector. However, when testing a high-temperature target, if the energy is too strong, irreversible damage may be caused to an infrared detector connected to an infrared temperature measurement lens, so that a related high-temperature test, such as a 1000-2000 ℃ smelting scene, cannot be completed.
In the prior art, when a high-temperature scene is tested, the total energy entering an infrared detector is reduced by adding an attenuation sheet in front of an infrared lens manually or controlling an iris diaphragm to reduce the clear aperture and improve the F number by adopting a motor, so that the detector reaches a threshold range which can meet the requirement of measuring a high-temperature target and is not damaged.
Disclosure of Invention
In view of the above problems, the present invention provides an infrared temperature measuring lens with a rear aperture, which is used to measure the temperature of a high temperature object without disassembling or changing the optical system during the use process by plating a high temperature film on the surface of the lens.
One of the technical solutions of the present invention for solving the above technical problems is as follows: the infrared temperature measuring lens comprises a first lens (1) with positive or negative diopter, a second lens (2) with negative diopter, a third lens (3) with positive diopter, an aperture diaphragm (4) and a detector in sequence from an object side to an imaging side.
Preferably, the third lens is plated with a high temperature film.
Preferably, the object side surface (11) of the first lens (1) has a convex surface portion in the vicinity of the optical axis, and the image side surface (12) has a concave surface portion in the vicinity of the optical axis.
Preferably, the object side surface (21) of the second lens (2) has a concave portion in the vicinity of the optical axis, and the image side surface (22) has a convex portion in the vicinity of the optical axis.
Preferably, the object side surface (31) of the third lens element (3) has a convex surface portion in the vicinity of the optical axis, and the image side surface (32) has a flat or convex surface portion in the vicinity of the optical axis.
Preferably, the first lens image side surface (12) and the second lens object side surface (21) are aspheric.
Preferably, one of the object-side surface (31) and the image-side surface (32) of the third lens element is aspheric, and the other surface is a flat surface or a spherical surface.
Preferably, the coating material of the high-temperature film comprises germanium and zinc sulfide, and is formed in a mode that zinc sulfide/germanium are alternately stacked.
Preferably, the detector comprises a detector protection window (5) and a detector focal plane (6); the detector protection window (5) is located in front of the detector focal plane (6).
Another technical solution for solving the above technical problems of the present invention is as follows: the infrared temperature measuring lens prevents high-temperature radiation energy from transmitting through the third lens plated with the high-temperature film, so that the detector is prevented from being damaged, meanwhile, the probability that stray radiation in front of the diaphragm enters the detector is reduced through the diaphragm arranged behind the third lens, and the proportion that effective light rays enter the detector is improved.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the high-temperature film is plated on the surface of the lens, and the infrared temperature measuring lens with the rear diaphragm is adopted, so that the purpose of high-temperature test is achieved under the condition of not disassembling and changing an optical system; compared with the prior art, the method for reducing the total energy entering the infrared detector by manually adding the attenuation sheet in front of the infrared lens or reducing the clear aperture by adopting the motor to control the iris diaphragm to improve the F number does not need to arrange the iris diaphragm between the lenses, the high-temperature film plated lens is used for realizing the high-temperature effective test, and meanwhile, the infrared temperature measurement lens with the rear-arranged iris diaphragm is adopted, so that all light rays entering the detector are limited, the probability of stray radiation before the diaphragm entering the detector is reduced, and the proportion of the effective light rays entering the detector is improved.
Drawings
FIG. 1 is a schematic diagram of an infrared temperature measurement lens according to the present invention;
fig. 2 is a schematic diagram of a filtering effect of the high temperature film provided by the present invention.
The reference numbers in the figures denote: the device comprises a first lens 1, a second lens 2, a third lens 3, an aperture diaphragm 4, a detector protection window 5 and a detector focal plane 6.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The first embodiment is as follows:
as shown in fig. 1, the infrared temperature measurement lens provided by the present invention sequentially includes, from an object side to an image side, a first lens (1) having positive or negative diopter, a second lens (2) having negative diopter, a third lens (3) having positive diopter, an aperture stop (4), and a detector.
Wherein the third lens is plated with a high temperature film.
The object side surface (11) of the first lens (1) is provided with a convex surface part in the area near the optical axis, and the image side surface (12) is provided with a concave surface part in the area near the optical axis.
The object side surface (21) of the second lens (2) is provided with a concave surface part in the area near the optical axis, and the image side surface (22) is provided with a convex surface part in the area near the optical axis.
The object side surface (31) of the third lens (3) is provided with a convex surface part in the area near the optical axis, and the image side surface (32) is provided with a plane or convex surface part in the area near the optical axis.
The first lens image side surface (12) and the second lens object side surface (21) are aspheric.
Any one surface of the object side surface (31) and the image side surface (32) of the third lens is an aspheric surface, and the other surface is a plane or a spherical surface.
The detector comprises a detector protection window (5) and a detector focal plane (6); the detector protection window (5) is located in front of the detector focal plane (6).
Example two:
in another embodiment, the high temperature film is composed of germanium/zinc sulfide as a main coating material, and is composed of tens of alternately stacked layers of zinc sulfide/germanium, and the number of stacked layers can be set preferentially according to specific needs. Wherein, the mode of zinc sulfide/germanium alternate stack refers to: plating a layer of zinc sulfide and then plating a layer of germanium; then continuously plating a layer of zinc sulfide and then plating a layer of germanium; ... alternate plating was performed as described above.
The high-temperature film can be coated on only the object side surface or the image side surface of the third lens, or the high-temperature film can be coated on both the object side surface and the image side surface of the third lens. When the high-temperature film is coated on one surface of the third lens, the number of layers corresponding to the zinc sulfide/germanium is 50-60; when the high-temperature films are coated on two sides of the third lens, the number of layers of zinc sulfide/germanium coated on the object side surface is larger than that of the zinc sulfide/germanium coated on the image side surface.
Wherein, the thickness of each layer of zinc sulfide coating film and germanium coating film is different, the thickness range of the zinc sulfide coating film is 200-1200nm, and the thickness range of the germanium coating film is 50-700 nm. When one side of the third lens is non-planar, the thickness of the high temperature film coated on the third lens may be uniform or non-uniform depending on the curvature of the non-planar side of the lens. For example, when the curvature is more than 50 degrees, the thickness of each of the high temperature films is thick at the center and thin at both ends.
In the prior art, in a high-temperature test scene, high-temperature radiation energy is mainly concentrated on short wave of 1-6 μm. The high-temperature film adopted by the invention can prevent more than 99% of light rays with wave bands of 1-7 mu m from radiating and transmitting through the lens, and can ensure that the light rays with wave bands of 8-12 mu m can pass through the lens with the transmittance of more than 92%, thereby achieving the purpose of ensuring the effective temperature measurement within the range of-40 ℃ to +2000 ℃, and the specific filtering effect is shown in figure 2.
Furthermore, the value ranges of the coating thicknesses of the upper x layer, the middle y layer and the lower z layer of the high-temperature film can be respectively adjusted according to the number n of the layers of the high-temperature film, so that the infrared detector is in the best performance. Wherein x + y + z is n.
The aperture refers to an optical system aperture, and when the aperture is placed at the tail end of the system, all light rays entering the detector are limited, the probability that stray radiation in front of the aperture enters the detector is reduced, and the proportion of effective light rays entering the detector is improved.
Example three:
the infrared temperature measuring lens is adopted, the third lens plated with the high-temperature film prevents high-temperature radiation energy from penetrating through the infrared temperature measuring lens, the detector is prevented from being damaged, meanwhile, the diaphragm arranged behind the third lens reduces the probability that stray radiation in front of the diaphragm enters the detector, and the proportion that effective light rays enter the detector is improved.
The principle and the implementation of the present application are explained by applying specific examples in the present invention, and the above description of the examples is only used to help understanding the method and the core idea of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are no specific structures which are objectively limitless due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the technical features mentioned above can be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention in other instances, which may or may not be practiced, are intended to be within the scope of the present application.
Claims (10)
1. An infrared temperature measurement lens is characterized in that: the imaging lens sequentially comprises a first lens (1) with positive or negative diopter, a second lens (2) with negative diopter, a third lens (3) with positive diopter, an aperture diaphragm (4) and a detector from an object side to an imaging side.
2. The infrared thermometric lens of claim 1, wherein: the third lens is plated with a high-temperature film.
3. The infrared thermometric lens of claim 1, wherein: the object side surface (11) of the first lens (1) is provided with a convex surface part in the area near the optical axis, and the image side surface (12) is provided with a concave surface part in the area near the optical axis.
4. The infrared thermometric lens of claim 3, wherein: the object side surface (21) of the second lens (2) is provided with a concave surface part in the area near the optical axis, and the image side surface (22) is provided with a convex surface part in the area near the optical axis.
5. The infrared thermometric lens of claim 4, wherein: the object side surface (31) of the third lens (3) is provided with a convex surface part in the area near the optical axis, and the image side surface (32) is provided with a plane or convex surface part in the area near the optical axis.
6. The infrared thermometric lens of claim 4, wherein: the first lens image side surface (12) and the second lens object side surface (21) are aspheric.
7. The infrared thermometric lens of claim 5, wherein: any one of the object side surface (31) and the image side surface (32) of the third lens is an aspheric surface, and the other surface is a plane or a spherical surface.
8. The infrared thermometric lens of claim 2, wherein: the coating material of the high-temperature film comprises germanium and zinc sulfide, and is formed in a mode that zinc sulfide/germanium are alternately superposed.
9. The infrared thermometric lens of claim 1, wherein: the detector comprises a detector protection window (5) and a detector focal plane (6); the detector protection window (5) is located in front of the detector focal plane (6).
10. A temperature measurement method of an infrared temperature measurement lens is characterized in that: the infrared thermometric lens according to claim 1, wherein the third lens coated with the high temperature film prevents the high temperature radiation energy from transmitting therethrough, thereby preventing the detector from being damaged, and the diaphragm disposed behind the third lens reduces the probability of stray radiation entering the detector before the diaphragm, thereby increasing the ratio of effective light entering the detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537881.7A CN114199382A (en) | 2021-12-15 | 2021-12-15 | Infrared temperature measurement lens and temperature measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537881.7A CN114199382A (en) | 2021-12-15 | 2021-12-15 | Infrared temperature measurement lens and temperature measurement method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114199382A true CN114199382A (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111537881.7A Pending CN114199382A (en) | 2021-12-15 | 2021-12-15 | Infrared temperature measurement lens and temperature measurement method |
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| CN (1) | CN114199382A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067661A (en) * | 2007-07-04 | 2007-11-07 | 中国航空工业第一集团公司第六一三研究所 | Infrared cut-off light filtering films on germanium-base parts surface and plating method thereof |
| US20150192763A1 (en) * | 2014-01-06 | 2015-07-09 | Flir Systems, Inc. | Coatings for use with long wavelength detection, optical system including the same, and associated methods |
| CN107092076A (en) * | 2017-06-05 | 2017-08-25 | 湖北久之洋红外系统股份有限公司 | A kind of high pass light quantity compact LONG WAVE INFRARED tight shot |
| CN107390349A (en) * | 2017-08-30 | 2017-11-24 | 福建福光股份有限公司 | A kind of long wave refrigeration mode is without thermalization camera lens |
| CN111965802A (en) * | 2020-09-16 | 2020-11-20 | 中国科学院合肥物质科学研究院 | Long-rear working distance optical athermal long-wave infrared lens |
| CN212540843U (en) * | 2020-07-03 | 2021-02-12 | 三河市蓝思泰克光电科技有限公司 | Portable large-view-field infrared temperature measurement lens |
| CN112764199A (en) * | 2021-01-26 | 2021-05-07 | 宁波舜宇红外技术有限公司 | Long-wave infrared lens and infrared vehicle-mounted night vision system |
-
2021
- 2021-12-15 CN CN202111537881.7A patent/CN114199382A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101067661A (en) * | 2007-07-04 | 2007-11-07 | 中国航空工业第一集团公司第六一三研究所 | Infrared cut-off light filtering films on germanium-base parts surface and plating method thereof |
| US20150192763A1 (en) * | 2014-01-06 | 2015-07-09 | Flir Systems, Inc. | Coatings for use with long wavelength detection, optical system including the same, and associated methods |
| CN107092076A (en) * | 2017-06-05 | 2017-08-25 | 湖北久之洋红外系统股份有限公司 | A kind of high pass light quantity compact LONG WAVE INFRARED tight shot |
| CN107390349A (en) * | 2017-08-30 | 2017-11-24 | 福建福光股份有限公司 | A kind of long wave refrigeration mode is without thermalization camera lens |
| CN212540843U (en) * | 2020-07-03 | 2021-02-12 | 三河市蓝思泰克光电科技有限公司 | Portable large-view-field infrared temperature measurement lens |
| CN111965802A (en) * | 2020-09-16 | 2020-11-20 | 中国科学院合肥物质科学研究院 | Long-rear working distance optical athermal long-wave infrared lens |
| CN112764199A (en) * | 2021-01-26 | 2021-05-07 | 宁波舜宇红外技术有限公司 | Long-wave infrared lens and infrared vehicle-mounted night vision system |
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Application publication date: 20220318 |