CN114061762A - Infrared detector capable of recognizing small temperature difference - Google Patents
Infrared detector capable of recognizing small temperature difference Download PDFInfo
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- CN114061762A CN114061762A CN202111526791.8A CN202111526791A CN114061762A CN 114061762 A CN114061762 A CN 114061762A CN 202111526791 A CN202111526791 A CN 202111526791A CN 114061762 A CN114061762 A CN 114061762A
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- shell
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- infrared
- infrared sensor
- convex lens
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- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 230000009467 reduction Effects 0.000 claims description 15
- 230000031700 light absorption Effects 0.000 claims description 10
- 230000007306 turnover Effects 0.000 claims description 5
- 206010037660 Pyrexia Diseases 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004476 mid-IR spectroscopy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
-
- 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
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
- G01J5/0025—Living bodies
-
- 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
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
-
- 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
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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
- G01J5/0846—Optical arrangements having multiple detectors for performing different types of detection, e.g. using radiometry and reflectometry channels
-
- 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
- G01J5/0853—Optical arrangements having infrared absorbers other than the usual absorber layers deposited on infrared detectors like bolometers, wherein the heat propagation between the absorber and the detecting element occurs within a solid
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Radiation Pyrometers (AREA)
Abstract
The invention discloses an infrared detector for micro temperature difference identification, which relates to the technical field of infrared detectors and comprises a shell, a first infrared sensor, a first Fresnel lens and an optical lens, wherein the first infrared sensor, the first Fresnel lens and the optical lens are arranged in the shell, and the infrared detector further comprises: the separation assembly is arranged in the shell and used for separating infrared rays; the auxiliary identification assembly is arranged on the side face of the shell and used for receiving the infrared light separated by the separation assembly. According to the invention, the separation component and the auxiliary identification component are arranged, so that the first infrared sensor and the second infrared sensor can simultaneously process the same infrared ray, and the infrared ray separation design can avoid the phenomenon that the light ray energy is too concentrated and can detect smaller temperature difference.
Description
Technical Field
The invention relates to the technical field of infrared detectors, in particular to an infrared detector for micro temperature difference identification.
Background
An infrared detector is a device that converts an incident infrared radiation signal into an electrical signal for output. Infrared radiation is electromagnetic waves with wavelengths between visible and microwave, and is imperceptible to the human eye. To detect the presence of such radiation and measure its intensity, it must be converted into other physical quantities that can be detected and measured, and an infrared detector detects the presence or movement of a human body through a pyroelectric element therein and converts the output signal of the pyroelectric element into a voltage signal, which is subjected to waveform analysis.
In prior art infrared detectors, because the dark current is exponentially dependent on the operating temperature of the detector, the lower the dark current, the higher the operating temperature, before the dark current can be compared to the photocurrent. When the detector reaches the background limit performance temperature, the further increase in temperature causes a large degradation in image quality, thus making the detector insensitive to any minor temperature variations and therefore requiring an urgent change.
Disclosure of Invention
The invention aims to solve the problems and provides an infrared detector for micro temperature difference identification.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an infrared detector of little difference in temperature discernment, includes the casing and sets up first infrared sensor, first fresnel lens, optical lens in it, still includes:
the separation assembly is arranged in the shell and used for separating infrared rays;
the auxiliary identification assembly is arranged on the side face of the shell and used for receiving the infrared light separated by the separation assembly.
Optionally, the separating assembly is composed of a first light-absorbing shell, a first convex lens, a half mirror and a second fresnel lens;
the first light absorption shell is of a hollow structure with two communicated ends, a window is arranged at the position, corresponding to the auxiliary identification assembly, of the first light absorption shell, the first convex lens and the second Fresnel lens are located at the ports of the two sides of the first light absorption shell, and the first convex lens and the second Fresnel lens are coaxially arranged with a main optical axis of the first infrared sensor;
the semi-reflecting mirror is arranged in the first light absorption shell and close to the windowing part, and the semi-reflecting mirror and a main optical axis of the first infrared sensor are coaxially arranged.
Optionally, an angle between the half mirror and a main optical axis of the first infrared sensor is 30-90 °.
Optionally, the auxiliary identification component is composed of a second light absorption shell, a second convex lens and a second infrared sensor;
the second absorbs light the shell and sets up on the inner wall of casing, the second absorbs light the shell and possesses an opening, and the opening corresponds with the position of windowing, the second convex lens sets up the opening part at the second shell that absorbs light, second infrared sensor sets up in the casing, the second convex lens focuses on the reflected light ray of half mirror to the second infrared sensor.
Optionally, the turnover device further comprises a turnover assembly, wherein the turnover assembly is composed of a reduction gear set, a bracket and a micro motor;
the support mounting is in the casing, reduction gear group hub connection is on the support, micro motor installs on the support, reduction gear group's input and micro motor's output shaft key-type connection, reduction gear group's output is fixed with first light-absorbing shell through the pivot.
Compared with the prior art, the invention has the following advantages:
according to the invention, by arranging the separation component, the light focused by the first Fresnel lens is converted into parallel light through the scattering of the first convex lens, at the moment, the light can be separated, part of the light passes through the half-reflecting mirror and is received by the first infrared sensor through the focusing of the second Fresnel lens, and part of the light is reflected along the half-reflecting mirror and enters the auxiliary identification component.
According to the invention, the auxiliary identification component is arranged, and the second convex lens focuses light on the second infrared sensor, so that the first infrared sensor and the second infrared sensor can simultaneously process the same infrared ray, and the design of infrared ray separation can avoid the phenomenon that light energy is too concentrated, and can detect smaller temperature difference.
Drawings
FIG. 1 is a schematic diagram of a prior art mid-IR detector;
FIG. 2 is a schematic view of the overall structure of the present invention;
FIG. 3 is a light path diagram of the present invention;
FIG. 4 is a schematic view of an auxiliary identification component according to the present invention;
FIG. 5 is a schematic view of the separating assembly of the present invention.
In the figure: the micro-motor comprises a shell 1, a first infrared sensor 2, a first Fresnel lens 3, an optical lens 4, an auxiliary identification assembly 5, a second light absorption shell 51, a second infrared sensor 52, a second convex lens 53, a separating assembly 6, a light absorption shell 61, a convex lens 62, a windowing component 63, a semi-reflecting mirror 64, a second Fresnel lens 65, a storage box 7, an overturning assembly 8, a speed reduction gear set 81, a support 82 and a micro-motor 83.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Referring to fig. 1-4, an infrared detector for recognizing a small temperature difference includes a housing 1, and a first infrared sensor 2, a first fresnel lens 3, and an optical lens 4 disposed in the housing, where the first fresnel lens 3 may focus infrared rays radiated by a human body onto the first infrared sensor 2, and the specific arrangement refers to fig. 1, which is prior art and is not described in detail in this embodiment.
The separating assembly 6 is arranged in the shell 1, the separating assembly 6 is used for separating infrared light, the separating assembly 6 is composed of a first light absorbing shell 61, a first convex lens 62, a half mirror 64 and a second Fresnel lens 9, and the separating assembly is specifically arranged as follows:
the first light-absorbing shell 61 is of a hollow structure with two communicated ends, the first light-absorbing shell 61 is provided with a window 63 at a position corresponding to the auxiliary identification component 5, the first convex lens 62 and the second Fresnel lens 9 are located at two side ports of the first light-absorbing shell 61, and the first convex lens 62 and the second Fresnel lens 9 are coaxially arranged with a main optical axis of the first infrared sensor 2.
A half mirror 64 is provided in the first light-absorbing housing 61 near the window 63, and the half mirror 64 is provided coaxially with the main optical axis of the first infrared sensor 2.
The angle between the half mirror 64 and the main optical axis of the first infrared sensor 2 is 30 to 90 °, and in the present embodiment, the angle between the half mirror 64 and the main optical axis of the first infrared sensor 2 is 45 °.
The separating assembly 6 has the function of converting the light focused by the first fresnel lens 3 into parallel light by diffusion through the first convex lens 62, where the light can be separated, part of the light passes through the half-mirror 64 and is received by the first infrared sensor 2 by focusing through the second fresnel lens 9, and part of the light is reflected along the half-mirror 64 and enters the secondary identification assembly 5.
The auxiliary identification component 5 is arranged on the side surface of the shell 1, the auxiliary identification component 5 is used for receiving the infrared light separated by the separation component 6, the auxiliary identification component 5 is composed of a second light absorption shell 51, a second convex lens 53 and a second infrared sensor 52, and the components are arranged as follows:
the second light-absorbing shell 51 is arranged on the inner wall of the shell 1, the second light-absorbing shell 51 is provided with an opening, the opening corresponds to the position of the window 63, the second convex lens 53 is arranged at the opening of the second light-absorbing shell 51, the second infrared sensor 52 is arranged in the shell 1, and the second convex lens 53 focuses the reflected light of the half-reflecting mirror 64 on the second infrared sensor 52.
Example two
Referring to fig. 5, the present embodiment further includes an overturning assembly 8 on the basis of the first embodiment, where the overturning assembly 8 is composed of a reduction gear set 81, a bracket 82 and a micro motor 83, and the components are arranged as follows:
the support 82 is installed in the housing 1, the reduction gear set 81 is connected to the support 82 through a shaft, the micro motor 83 is installed on the support 82, the input end of the reduction gear set 81 is connected to the output shaft of the micro motor 83 through a key, and the output end of the reduction gear set 81 is fixed to the first light-absorbing shell 61 through a rotating shaft.
The bottom of casing 1 is provided with accomodates shell 7, drives reduction gear 81 through micro motor 83 and operates, and reduction gear 81 drives first light-absorbing shell 61 and overturns, can accomodate to accomodating in the shell 7 at last, can return the infrared detection among the tradition this moment to can switch in two kinds of detection modes.
The above description is only a preferred embodiment of the present invention, and not intended to be exhaustive or to limit the scope of the present invention, and any person skilled in the art should be able to make equivalents and modifications within the technical scope of the present invention.
Claims (5)
1. The utility model provides an infrared detector of little difference in temperature discernment, includes casing (1) and sets up first infrared sensor (2), first fresnel lens (3), optical lens (4) in it, its characterized in that still includes:
the separation assembly (6), the separation assembly (6) is arranged in the shell (1), and the separation assembly (6) is used for separating infrared rays;
the auxiliary identification component (5), the auxiliary identification component (5) is arranged on the side face of the shell (1), and the auxiliary identification component (5) is used for receiving the infrared light separated by the separation component (6).
2. The infrared detector for identification of minute temperature differences according to claim 1, characterized in that said separating assembly (6) is composed of a first light-absorbing shell (61), a first convex lens (62), a half-reflecting mirror (64), a second fresnel lens (9);
the first light-absorbing shell (61) is of a hollow structure with two communicated ends, a window (63) is arranged at the position, corresponding to the auxiliary identification component (5), of the first light-absorbing shell (61), the first convex lens (62) and the second Fresnel lens (9) are located at ports on two sides of the first light-absorbing shell (61), and the first convex lens (62) and the second Fresnel lens (9) are coaxially arranged with a main optical axis of the first infrared sensor (2);
the half-reflecting mirror (64) is arranged in the first light-absorbing shell (61) and close to the window (63), and the half-reflecting mirror (64) and a main optical axis of the first infrared sensor (2) are coaxially arranged.
3. The infrared detector for identification of minor temperature differences according to claim 2, characterized in that the angle between the half mirror (64) and the main optical axis of the first infrared sensor (2) is 30-90 °.
4. The infrared detector for identification of slight temperature difference according to claim 2, characterized in that the auxiliary identification component (5) is composed of a second light absorption shell (51), a second convex lens (53) and a second infrared sensor (52);
the second light-absorbing shell (51) is arranged on the inner wall of the shell (1), the second light-absorbing shell (51) is provided with an opening, the opening corresponds to the position of the window (63), the second convex lens (53) is arranged at the opening of the second light-absorbing shell (51), the second infrared sensor (52) is arranged in the shell (1), and the second convex lens (53) focuses the reflected light of the half-reflecting mirror (64) onto the second infrared sensor (52).
5. The infrared detector for micro temperature difference identification according to claim 2, further comprising a turnover assembly (8), wherein the turnover assembly (8) is composed of a reduction gear set (81), a bracket (82) and a micro motor (83);
the support (82) is installed in the shell (1), the speed reduction gear set (81) is connected to the support (82) in a shaft mode, the micro motor (83) is installed on the support (82), the input end of the speed reduction gear set (81) is connected with the output shaft key of the micro motor (83), and the output end of the speed reduction gear set (81) is fixed with the first light absorption shell (61) through the rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111526791.8A CN114061762B (en) | 2021-12-14 | 2021-12-14 | Infrared detector capable of identifying small temperature difference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111526791.8A CN114061762B (en) | 2021-12-14 | 2021-12-14 | Infrared detector capable of identifying small temperature difference |
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| Publication Number | Publication Date |
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| CN114061762A true CN114061762A (en) | 2022-02-18 |
| CN114061762B CN114061762B (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111526791.8A Active CN114061762B (en) | 2021-12-14 | 2021-12-14 | Infrared detector capable of identifying small temperature difference |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0623811A1 (en) * | 1993-05-03 | 1994-11-09 | Universidade Do Minho | Method of contactless measuring the surface temperature and/or emissivity of objects |
| JP2001215491A (en) * | 2000-01-31 | 2001-08-10 | Hitachi Ltd | Polarized beam splitter and reflection type liquid crystal projector using the same |
| US20040079886A1 (en) * | 2002-09-13 | 2004-04-29 | Johannes Opfermann | Device for detecting thermal conductivity by means of optical pulses |
| CN101566502A (en) * | 2009-04-15 | 2009-10-28 | 中国科学院上海微系统与信息技术研究所 | Thermo-optical infrared detector and preparation method thereof |
| CN111044156A (en) * | 2019-12-13 | 2020-04-21 | 上海交通大学 | Optical shutter type non-modulation infrared temperature measurement system and method |
-
2021
- 2021-12-14 CN CN202111526791.8A patent/CN114061762B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0623811A1 (en) * | 1993-05-03 | 1994-11-09 | Universidade Do Minho | Method of contactless measuring the surface temperature and/or emissivity of objects |
| JP2001215491A (en) * | 2000-01-31 | 2001-08-10 | Hitachi Ltd | Polarized beam splitter and reflection type liquid crystal projector using the same |
| US20040079886A1 (en) * | 2002-09-13 | 2004-04-29 | Johannes Opfermann | Device for detecting thermal conductivity by means of optical pulses |
| CN101566502A (en) * | 2009-04-15 | 2009-10-28 | 中国科学院上海微系统与信息技术研究所 | Thermo-optical infrared detector and preparation method thereof |
| CN111044156A (en) * | 2019-12-13 | 2020-04-21 | 上海交通大学 | Optical shutter type non-modulation infrared temperature measurement system and method |
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| Publication number | Publication date |
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| CN114061762B (en) | 2024-04-05 |
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