CN115014512A - Double-wedge-cavity absolute radiometer - Google Patents
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- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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Abstract
A double-wedge-cavity absolute radiometer comprises a first rectangular plane sensing unit, a second rectangular plane sensing unit, a third rectangular plane sensing unit, a fourth rectangular plane sensing unit, a reflection support body and a diaphragm. The reflection support body is fixedly connected to the side edges of the first to fourth rectangular plane sensing units, forms a first wedge cavity space for optical radiation detection with the first and second rectangular plane sensing units, and forms a second wedge cavity space for background drift compensation with the third and fourth rectangular plane sensing units. The wedge-shaped cavity is used as a light radiation receiving structure, the light radiation irradiation surface is a plane, and compared with the traditional cone cavity, the wide-spectrum high absorption rate is ensured, the response uniformity of the device surface is improved, the heating layer and the sensing layer core device are easier to be processed, manufactured and assembled in a standardized batch mode, and the production efficiency, the mass production consistency and the metering characteristic of the device are greatly improved.
Description
Technical Field
The invention relates to the technical field of optical radiation measurement, in particular to a double-wedge-cavity absolute radiometer which is used for measuring optical power and irradiance and used for manufacturing a reference and standard-grade high-precision optical power meter and an irradiance meter.
Background
An absolute radiometer is a light radiometric measuring device used for absolute measurement of light power or irradiance values. Absolute radiometers are usually taken as the standardThe measuring instrument with higher accuracy is used for measuring various types of common relative measuring instruments such as power meters, radiometers, heat flow meters and the like on the market and is used for measuring the light irradiance (W/m) 2 ) And the source of the light radiation physical quantity value such as the optical power (W).
The absolute radiometer has an electrical alternative calibration function, and can realize absolute measurement of irradiance. In addition, absolute radiometers also have a number of advantages in terms of their properties: the accuracy is high, and the influence of the ambient temperature and humidity is small; the spectral response is flat, and the full-wave-band traceability problem can be solved by one detector for equivalent measurement of extremely-wide-wave-band optical radiation; the surface response uniformity is superior to that of a part of special photoelectric detectors, and the problem of multiple specular reflection interference of the photoelectric detectors does not exist; the limitation on the irradiation incidence angle is small; compared with photoelectric detectors such as germanium, indium gallium arsenic and the like, the infrared band has larger measuring caliber, and can meet more practical application occasions and the like.
The optical radiation absorbers of absolute radiometers are mainly classified into planar and cavity types. The planar structure is relatively simple and has good uniformity, but the absorption rate is relatively low because the light radiation only has single absorption. The cavity structure generally adopts a conical cavity or a pyramid cavity to increase the absorption times of reflected light, and has higher light absorption rate and flatter spectrum absorption rate. However, the three-dimensional structure of the conical cavity or the pyramid cavity in the cavity structure is more complex than that of a plane structure, the volume and the mass are larger, the heat balance time is longer, the center of the receiving surface is the corner point, the problems of poor uniformity, low absorption rate and the like exist, and the metering characteristic is seriously influenced.
Disclosure of Invention
Technical problem to be solved
In view of the above, the main object of the present invention is to provide a dual wedge cavity absolute radiometer, which can realize absolute measurement of the optical power or irradiance in a wide spectral range.
(II) technical scheme
In order to achieve the above object, the present invention provides a dual wedge cavity absolute radiometer, which comprises a first rectangular plane sensing unit 1, a second rectangular plane sensing unit 2, a third rectangular plane sensing unit 3, a fourth rectangular plane sensing unit 4, a reflective support 5 and a diaphragm 6, wherein:
the second rectangular plane sensing unit 2 is parallel to the direction of the light radiation incidence normal, the first rectangular plane sensing unit 1 is obliquely positioned above the second rectangular plane sensing unit 2 as a light radiation receiving surface, the center of the light radiation incidence is a plane, the included angle between the first rectangular plane sensing unit 1 and the second rectangular plane sensing unit 2 is less than or equal to 45 degrees, and the incident light is reflected for multiple times between the first rectangular plane sensing unit 1 and the second rectangular plane sensing unit 2;
the third rectangular plane sensing unit 3 is positioned below the second rectangular plane sensing unit 2 and is parallel to the direction of the light radiation incidence normal, the fourth rectangular plane sensing unit 4 is obliquely positioned below the third rectangular plane sensing unit 3 as a light radiation receiving surface, and the included angle between the third rectangular plane sensing unit 3 and the fourth rectangular plane sensing unit 4 is less than or equal to 45 degrees;
the reflection support body 5 is fixedly connected to the side edges of the first to fourth rectangular plane sensing units, forms a first wedge cavity space for optical radiation detection with the first and second rectangular plane sensing units, and forms a second wedge cavity space for background drift compensation with the third and fourth rectangular plane sensing units;
and the diaphragm 6 is arranged on the reflection support body 5 at the space openings of the first wedge cavity and the second wedge cavity and used for providing a standard area and limiting the incident angle of light radiation so that the incident light radiation is completely irradiated on the first rectangular plane sensing unit, the second rectangular plane sensing unit and the fourth rectangular plane sensing unit.
In the above scheme, the first wedge cavity space and the second wedge cavity space form mirror symmetry in space.
In the above scheme, in the first wedge cavity space, a slit is left between the first rectangular plane sensing unit 1 and the second rectangular plane sensing unit 2 without contacting each other, so that the first and second rectangular plane sensing units are prevented from affecting each other during measurement; the projection of the light-passing opening of the diaphragm 6 along the incident normal completely falls into the first rectangular plane sensing unit 1, and meanwhile, the second rectangular plane sensing unit 2 extends out of the slit for a certain distance, so that oblique incident light passing through any point on the cross section of the diaphragm 6 falls into the first rectangular plane sensing unit 1 and the second rectangular plane sensing unit 2 to form the closing of the light-entering opening.
In the above solution, the third rectangular planar sensing unit 3 is attached below the second rectangular planar sensing unit 2.
In the above scheme, the first rectangular plane sensing unit 1 and the third rectangular plane sensing unit 3 each include a heat sink, a plane sensing layer, a plane heating layer, and a light absorption coating layer, which are sequentially connected from top to bottom as a whole, wherein:
the heat sink is stable in temperature, is connected with the first surface of the plane sensing layer and serves as a cold end of the plane sensing layer, and forms a sensing element with the plane sensing layer;
the planar heating layer is manufactured by adopting a thin film flexible circuit and is tightly connected to the second surface of the planar sensing layer, a loop is formed in the thin film flexible circuit, temperature rise is generated in the loop through current, temperature rise caused by radiation is simulated, an electric heating function is provided for the absolute radiometer, and optical power is equivalently replaced by electric power;
the light absorption coating is made of a functional material capable of absorbing light radiation, is coated on one side, away from the plane sensing layer, of the plane heating layer, and is used for absorbing and converting the light radiation into heat to form temperature rise.
In the above scheme, the second rectangular plane sensing unit 2 and the fourth rectangular plane sensing unit 4 both include a heat sink, a plane sensing layer, a plane heating layer, and a light absorption coating layer, which are sequentially connected from bottom to top.
In the above scheme, the heat sink is made of copper, aluminum, iron or alloy material with high thermal conductivity and high heat capacity; the planar heating layer is manufactured on the second surface of the planar sensing layer by adopting a polyester fiber flexible circuit, conductive silver paste and an enameled wire coil or directly coating; the heat sink, the plane sensing layer and the plane heating layer are connected or welded through heat conducting glue.
In the above scheme, the reflection support 5 is further connected to two sides of the heat sink, and is used for fixing components in the dual-wedge cavity absolute radiometer; at the same time, the inner wall of the reflective support 5 has a broad-band high reflectivity and reflects the optical radiation escaping from the light-absorbing coating back to the light-absorbing coating again with a higher reflectivity, thereby increasing the cavity absorption rate.
In the above solution, the diameter of the diaphragm 6 is smaller than 1/2 of the projection size of the first and fourth rectangular plane sensing units along the diaphragm direction.
In the above scheme, the double wedge cavity absolute radiometer further includes: the intermediate layer 7 surrounds the first to fourth rectangular plane sensing units and the outer side of the reflection support body 5, is connected with the reflection support body 5, and is provided with a connecting point 9 positioned on a midline of the first wedge cavity space and the second wedge cavity space, so as to reduce the influence of heat convection and heat conduction; and the shell 8 is connected with the interlayer 7, and the connecting point 9 is positioned on the midline of the first wedge cavity space and the second wedge cavity space, is used for reducing the influence of heat convection and heat conduction, and protects and supports the double-wedge cavity absolute radiometer.
(III) advantageous effects
According to the technical scheme, the double-wedge-cavity absolute radiometer provided by the invention has the following advantages:
1. the double-wedge-cavity absolute radiometer provided by the invention adopts the wedge-shaped cavity as the light radiation receiving structure, and compared with the traditional conical cavity or pyramid cavity, the light radiation receiving surface is a plane, so that the wide-spectrum high absorption rate is ensured, and the better surface uniformity of the double-wedge-cavity absolute radiometer relative to other types of absolute radiometers is determined on the basis of a physical structure. Meanwhile, the planar sensing layer and the heating layer can be manufactured to be thinner than three-dimensional configurations such as a cone, so that the device has shorter thermal relaxation time and higher photoelectric equivalence, and the response speed and accuracy of the absolute radiometer are improved.
2. According to the double-wedge-cavity absolute radiometer, the first to fourth rectangular plane sensing units are of plane structures, so that the plane sensing layer, the plane heating layer attached to the plane sensing layer and the light absorption coating can be processed, manufactured and assembled quickly in batches by adopting a standardized processing technology, the problems of standardization and efficiency in production and manufacturing are solved, and the consistency and the metering characteristics of mass production devices are improved.
3. The double-wedge-cavity absolute radiometer provided by the invention adopts a mirror symmetry double-wedge cavity structure, the space of the first wedge cavity is used for optical radiation detection, and the space of the second wedge cavity is used for compensating background drift, so that the measurement noise is reduced. Meanwhile, the interlayer is arranged, and the connection points of the interlayer, the wedge cavity space and the shell are all positioned on the mirror symmetry plane, so that the influence of thermal convection and thermal conduction is further reduced, and the equilibrium state recovery speed of the absolute radiometer after environmental disturbance is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the above mentioned drawings are only some embodiments of the invention, and it is within the scope of the invention for a person skilled in the art to derive other drawings from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a side complementary structure of a three-dimensional structure of a double-wedge absolute radiometer according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a dual wedge cavity absolute radiometer according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the connection mode of the interlayer of the dual wedge cavity absolute radiometer according to the embodiment of the present invention.
Description of the drawings:
1. first rectangular plane sensing unit
11. A first light absorbing coating; 12. a first planar heating layer; 13. a first planar sensing layer; 14. a first heat sink;
2. second rectangular plane sensing unit
21. A second light absorbing coating; 22. a second planar heating layer; 23. a second planar sensing layer; 24. a second heat sink;
3. third rectangular plane sensing unit
31. A third light absorbing coating; 32. a third planar heating layer; 33. a third planar sensing layer; 34. a third heat sink;
4. fourth rectangular plane sensing unit
41. A fourth light absorbing coating; 42. a fourth planar heating layer; 43. a fourth planar sensing layer; 44. a fourth heat sink;
5. reflective support
6. Diaphragm
7. Intermediate layer
8. Outer cover
9. Connection point
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
The invention discloses a double-wedge-cavity absolute radiometer, which adopts a wedge cavity as a light radiation receiving structure and is provided with a first wedge cavity space and a second wedge cavity space to form a double-wedge cavity structure. The double wedge cavity absolute radiometer provided by the invention is used for reproducing light irradiance (W/m) 2 ) And an optical power (W) magnitude having an optical irradiance (W/m) 2 ) And absolute measurement capability of optical power (W).
Fig. 1 to fig. 3 respectively illustrate the design principle and the structural features of the dual wedge cavity absolute radiometer provided by the embodiment of the present invention from different angles.
As shown in fig. 1 and fig. 2, the dual wedge cavity absolute radiometer provided by the embodiment of the present invention includes a first rectangular plane sensing unit 1, a second rectangular plane sensing unit 2, a third rectangular plane sensing unit 3, a fourth rectangular plane sensing unit 4, a reflective support 5, and a diaphragm 6, wherein:
the second rectangular planar sensing unit 2 is parallel to the normal direction of incidence of the optical radiation, and the first rectangular planar sensing unit 1 is located obliquely above the second rectangular planar sensing unit 2 as an optical radiation receiving face so that the center of incidence of the optical radiation is a plane. The first rectangular plane sensing unit 1 and the second rectangular plane sensing unit 2 have a pair of opposite sides which are parallel to each other, and the included angle formed by the planes of the opposite sides is not more than 45 degrees, so that incident light is reflected for multiple times between the first rectangular plane sensing unit 1 and the second rectangular plane sensing unit 2 and is fully absorbed by a coating;
the third rectangular plane sensing unit 3 is positioned below the second rectangular plane sensing unit 2 and is parallel to the direction of the light radiation incidence normal, the fourth rectangular plane sensing unit 4 is obliquely positioned below the third rectangular plane sensing unit 3 as a light radiation receiving surface, and the included angle between the third rectangular plane sensing unit 3 and the fourth rectangular plane sensing unit 4 is less than or equal to 45 degrees.
The reflection support body 5 is fixedly connected to the side edges of the first to fourth rectangular plane sensing units, forms a first wedge cavity space for optical radiation detection with the first and second rectangular plane sensing units, and forms a second wedge cavity space for background drift compensation with the third and fourth rectangular plane sensing units;
and the diaphragm 6 is arranged on the reflection support body 5 at the space opening of the first wedge cavity and the second wedge cavity and used for providing a standard area and limiting the incident angle of the optical radiation so that the optical radiation incident light is completely irradiated on the first rectangular plane sensing unit, the second rectangular plane sensing unit and the fourth rectangular plane sensing unit.
In one embodiment of the invention, the first wedge cavity space and the second wedge cavity space form mirror symmetry in space. The two wedge cavity spaces form mirror symmetry in space, wherein the first wedge cavity space formed by the first and second rectangular plane sensing units is used for optical radiation detection, and the second wedge cavity space formed by the third and fourth rectangular plane sensing units is used for compensating background drift.
In an embodiment of the present invention, in the first wedge cavity space, a slit is left between the first rectangular plane sensing unit 1 and the second rectangular plane sensing unit 2 without contacting each other, so as to prevent the first and second rectangular plane sensing units from affecting each other during measurement. The projection of the light passing opening of the diaphragm 6 along the incident normal completely falls into the first rectangular plane sensing unit 1, and meanwhile, the second rectangular plane sensing unit 2 extends out of the slit for a certain distance, so that oblique incident light passing through any point on the cross section of the diaphragm 6 can also fall into the first rectangular plane sensing unit 1 and the second rectangular plane sensing unit 2 to form the closing of the light passing opening.
In one embodiment of the present invention, in the second wedge chamber space, the third rectangular planar sensing unit 3 is attached below the second rectangular planar sensing unit 4. A slit is left between the third rectangular plane sensing unit 3 and the fourth rectangular plane sensing unit 4 without contacting each other, so that the third and fourth rectangular plane sensing units are prevented from influencing each other during measurement.
In one embodiment of the present invention, as shown in fig. 1 and 2, a first rectangular planar sensing unit 1, a second rectangular planar sensing unit 2, a third rectangular planar sensing unit 3, and a fourth rectangular planar sensing unit 4 are used as sensing components of the dual wedge cavity absolute radiometer provided by the present invention.
In one embodiment of the present invention, as shown in fig. 2, the first rectangular planar sensing unit 1 includes a first heat sink 14, a first planar sensing layer 13, a first planar heating layer 12 and a first light absorbing coating 11, which are connected in sequence from top to bottom. The first heat sink 14 is temperature stable, and is connected to the first surface of the first planar sensing layer 13 (i.e. the surface far away from the first wedge cavity space), and as the cold end of the first planar sensing layer 13, constitutes a sensing element with the first planar sensing layer 13, when the first planar sensing layer 13 receives optical radiation relative to the second surface of the first surface (i.e. the surface close to the first wedge cavity space), the first planar sensing layer 13 is connected to the first surface of the first heat sink 14 to provide a constant temperature reference, so that the first planar sensing layer 13 forms a temperature difference signal. The first plane heating layer 12 is made of a thin film flexible circuit, and is tightly connected to a second surface (a surface different from the heat sink end) of the first plane sensing layer 13, a loop is formed in the thin film flexible circuit, temperature rise is generated in the loop through current, temperature rise caused by radiation is simulated, an electric heating function is provided for an absolute radiometer, and optical power is equivalently replaced by electric power. The first light absorption coating 11 is made of a functional material capable of absorbing light radiation, is coated on one side, away from the first plane sensing layer 13, of the first plane heating layer 12, and is used for absorbing and converting the light radiation into heat to form temperature rise.
In one embodiment of the present invention, as shown in fig. 2, the second rectangular planar sensing unit 2 includes a second heat sink 24, a second planar sensing layer 23, a second planar heating layer 22 and a second light absorbing coating 21, which are sequentially connected from bottom to top. The second heat sink 24 is temperature-stable, and is connected to the first surface (i.e. the surface far from the first wedge cavity space) of the second planar sensing layer 23, and serves as the cold end of the second planar sensing layer 23, and forms a sensing element with the second planar sensing layer 23, when the second planar sensing layer 23 receives optical radiation relative to the first surface (i.e. the surface close to the first wedge cavity space), the second planar sensing layer 23 is connected to the first surface of the second heat sink 24 to provide a constant temperature reference, so that the second planar sensing layer 23 forms a temperature difference signal. The second planar heating layer 22 is made of a thin film flexible circuit, and is tightly connected to a second surface (a surface different from the heat sink end) of the second planar sensing layer 23, a loop is formed in the thin film flexible circuit, and temperature rise caused by radiation is simulated by current in the loop, so that an electrical heating function is provided for an absolute radiometer, and optical power is equivalently replaced by electric power. The second light absorption coating 21 is made of a functional material capable of absorbing light radiation, and is coated on one side of the second planar heating layer 22, which is far away from the second planar sensing layer 23, so as to absorb and convert the light radiation into heat, thereby forming a temperature rise.
In one embodiment of the present invention, as shown in fig. 2, the third rectangular planar sensing cell 3 includes a third heat sink 34, a third planar sensing layer 33, a third planar heating layer 32 and a third light absorbing coating 31, which are sequentially connected as one body from top to bottom. The third heat sink 34 is temperature-stabilized and connected to the first plane of the third planar sensing layer 33 (i.e. the plane far from the second wedge cavity space), and serves as the cold end of the third planar sensing layer 33, and forms a sensing element with the third planar sensing layer 33, when the third planar sensing layer 33 receives optical radiation relative to the second plane of the first plane (i.e. the plane close to the second wedge cavity space), the third planar sensing layer 33 is connected to the first plane of the third heat sink 34 to provide a constant temperature reference, so that the third planar sensing layer 33 forms a temperature difference signal. The third planar heating layer 32 is made of a thin film flexible circuit, and is tightly connected to the second surface (the surface different from the heat sink end) of the third planar sensing layer 33, a loop is formed in the thin film flexible circuit, and a temperature rise caused by radiation is simulated by generating a temperature rise through current in the loop, so that an electrical heating function is provided for an absolute radiometer, and optical power is equivalently replaced by electric power. The third light absorption coating 31 is made of a functional material capable of absorbing light radiation, and is coated on one side of the third planar heating layer 32, which is far away from the third planar sensing layer 33, for absorbing and converting the light radiation into heat, so as to form a temperature rise.
In one embodiment of the present invention, as shown in fig. 2, the fourth rectangular planar sensing unit 4 includes a fourth heat sink 44, a fourth planar sensing layer 43, a fourth planar heating layer 42 and a fourth light absorbing coating 41 which are sequentially connected from bottom to top. The fourth heat sink 44 is temperature-stable, and is connected to the first surface of the fourth planar sensing layer 43 (i.e. the surface far away from the second wedge cavity space), and serves as the cold end of the fourth planar sensing layer 43, and forms a sensing element with the fourth planar sensing layer 43, when the fourth planar sensing layer 43 receives optical radiation relative to the second surface of the first surface (i.e. the surface close to the second wedge cavity space), the fourth planar sensing layer 43 is connected to the first surface of the fourth heat sink 44 to provide a constant temperature reference, so that the fourth planar sensing layer 43 forms a temperature difference signal. The fourth plane heating layer 42 is made of a thin film flexible circuit, and is tightly connected to the second surface (the surface different from the heat sink end) of the fourth plane sensing layer 43, a loop is formed in the thin film flexible circuit, temperature rise is generated in the loop through current, temperature rise caused by radiation is simulated, an electric heating function is provided for the absolute radiometer, and optical power is equivalently replaced by electric power. The fourth light absorption coating 41 is made of a functional material capable of absorbing light radiation, and is coated on one side of the fourth plane heating layer 42, which is far away from the fourth plane sensing layer 43, and is used for absorbing and converting the light radiation into heat to form temperature rise.
In one embodiment of the present invention, as shown in fig. 2, the first heat sink 14, the second heat sink 24, the third heat sink 34, and the fourth heat sink 44 are made of copper, aluminum, iron, or alloy material with high thermal conductivity and high heat capacity. The first planar heating layer 12, the second planar heating layer 22, the third planar heating layer 32 and the fourth planar heating layer 42 are all made of polyester fiber flexible circuits, conductive silver paste, enameled wire coils, or are directly plated on the second surface of the planar sensing layer. Specifically, the first planar heating layer 12, the second planar heating layer 22, the third planar heating layer 32, and the fourth planar heating layer 42 provide an electrical heating function for the absolute radiometer, which is a key component for realizing absolute value reproduction and absolute measurement functions by replacing optical power with electrical power. The electric heating power is calculated by measuring the current flowing through the plane heating layer and the voltage at the two ends of the plane heating layer. The double-wedge-cavity absolute radiometer provided by the invention adopts the wedge cavity as the light radiation receiving structure, and compared with the traditional conical cavity or pyramid cavity, the light radiation receiving surface is a plane, so that the wide-spectrum high absorption rate is ensured, and the better surface uniformity of the double-wedge-cavity absolute radiometer relative to other types of absolute radiometers is determined on the basis of a physical structure. Meanwhile, the planar sensing layer and the heating layer can be manufactured to be thinner than three-dimensional configurations such as a cone, so that the device has shorter thermal relaxation time and higher photoelectric equivalence, and the response speed and accuracy of the absolute radiometer are improved. Meanwhile, the first to fourth rectangular plane sensing units are of plane structures, so that the plane sensing layer, the plane heating layer attached to the plane sensing layer and the light absorption coating can be processed, manufactured and quickly assembled in batches by adopting a standardized processing technology, the problems of standardization and efficiency in production and manufacturing are solved, and the consistency and the metering characteristics of mass production devices are improved.
In one embodiment of the present invention, as shown in fig. 2, when the first rectangular planar sensing unit 1, the second rectangular planar sensing unit 2, the third rectangular planar sensing unit 3, or the fourth rectangular planar sensing unit 4 is manufactured, the planar sensing layer is firstly fixed on the heat sink by using a heat conductive adhesive, the planar heating layer is then fixed on the planar sensing layer, and finally, the light absorption coating is coated.
In one embodiment of the present invention, as shown in fig. 1 and 2, the reflective support 5 is further connected to two sides of the first heat sink 14, the second heat sink 24, the third heat sink 34 and the fourth heat sink 44 for fixing the components of the dual wedge cavity absolute radiometer to each other. At the same time, the inner wall of the reflective support 5 has a broad-band high reflectivity and reflects the optical radiation escaping from each light-absorbing coating back to the light-absorbing coating again with a higher reflectivity, thereby increasing the cavity absorption rate.
In one embodiment of the invention, as shown in fig. 1 and 2, the diaphragm 6 is placed at the opening of the wedge cavity, and may be independent or may be formed by a reflective support 5, an interlayer 7 or a housing 8, for limiting or adjusting the incident aperture of the optical radiation. Optionally, the diameter of the diaphragm 6 is smaller than 1/2 of the projection size of the first and fourth rectangular plane sensing units along the diaphragm direction. The structural design is arranged, so that incident light radiation at any angle passing through the diaphragm 6 can not pass through the wedge-shaped slit, the light beam leakage can not be caused, the diaphragm limits the diameter of the light beam for collimated light beams, the light beam falls on the center of the first rectangular plane sensing unit and the center of the fourth rectangular plane sensing unit, and the measurement errors caused by the nonuniformity of the first rectangular plane sensing unit to the fourth rectangular plane sensing unit can be reduced.
In one embodiment of the present invention, as shown in fig. 3, the dual wedge absolute radiometer further includes an interlayer 7 surrounding the outer sides of the first to fourth rectangular planar sensing units and the reflective support 5, connected to the reflective support 5, and a connection point 9 located on a centerline of the first wedge space and the second wedge space. Specifically, an interlayer 7 is designed around the internal main structure formed by the first to fourth rectangular plane sensing units and the reflection support body 5, and the interlayer 7 is connected with the internal main structure through bolts. When the shell 8 has asymmetric temperature distribution, for example, when the shell is held by hand, the connection mode enables the heat conducted from the shell 8 to the interlayer 7 to uniformly enter from the central line, so that the temperature difference distribution of the interlayer 7 is symmetrical to the two groups of wedge-shaped cavities, various external temperature fluctuations are more easily balanced and compensated by the compensation cavity, the influence of the environment is further reduced, and the recovery speed of background drift of the radiometer is accelerated.
In an embodiment of the present invention, as shown in fig. 3, the dual wedge cavity absolute radiometer further includes a housing 8 connected to the interlayer 7, and a connection point 9 is located on a centerline of the first wedge cavity space and the second wedge cavity space, so as to further isolate interference of thermal convection and thermal conduction on the first to fourth rectangular planar sensing units, and protect and support the dual wedge cavity absolute radiometer.
It can be seen from the above embodiments that, compared with the conventional conical cavity or pyramid cavity, the dual-wedge-cavity absolute radiometer provided by the present invention has a planar optical radiation irradiation surface, improves the response uniformity and response speed of the device surface while ensuring a high absorption rate of a broad spectrum, and has the advantages of high measurement speed, high accuracy, easy mass production and assembly, good consistency, etc.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A double wedge chamber absolute radiometer, comprising a first rectangular planar sensing unit (1), a second rectangular planar sensing unit (2), a third rectangular planar sensing unit (3), a fourth rectangular planar sensing unit (4), a reflective support (5) and a diaphragm (6), wherein:
the second rectangular plane sensing unit (2) is parallel to the direction of the light radiation incidence normal, the first rectangular plane sensing unit (1) is obliquely positioned above the second rectangular plane sensing unit (2) as a light radiation receiving surface, the center of the light radiation incidence is a plane, the included angle formed by the first rectangular plane sensing unit (1) and the second rectangular plane sensing unit (2) is less than or equal to 45 degrees, and the incident light is reflected for multiple times between the first rectangular plane sensing unit (1) and the second rectangular plane sensing unit (2);
the third rectangular plane sensing unit (3) is positioned below the second rectangular plane sensing unit (2) and is parallel to the direction of the light radiation incidence normal, the fourth rectangular plane sensing unit (4) is obliquely positioned below the third rectangular plane sensing unit (3) as a light radiation receiving surface, and the included angle between the third rectangular plane sensing unit (3) and the fourth rectangular plane sensing unit (4) is less than or equal to 45 degrees;
the reflection support body (5) is fixedly connected to the side edges of the first to fourth rectangular plane sensing units, forms a first wedge cavity space for optical radiation detection with the first and second rectangular plane sensing units, and forms a second wedge cavity space for background drift compensation with the third and fourth rectangular plane sensing units;
and the diaphragm (6) is arranged on the reflection support body (5) at the space opening of the first wedge cavity and the second wedge cavity and used for providing a standard area and limiting the incident angle of light radiation so that the incident light radiation is completely irradiated on the first rectangular plane sensing unit, the second rectangular plane sensing unit and the fourth rectangular plane sensing unit.
2. The dual wedge cavity absolute radiometer of claim 1, wherein the first wedge cavity volume and the second wedge cavity volume form a mirror image in space.
3. The double wedge absolute radiometer of claim 2, characterized in that in the first wedge space, a slit is left between the first rectangular plane sensing unit (1) and the second rectangular plane sensing unit (2) without contact, so as to avoid the first and second rectangular plane sensing units from affecting each other during measurement; the light passing opening of the diaphragm (6) completely falls into the first rectangular plane sensing unit (1) along the projection of an incident normal line, and meanwhile, the second rectangular plane sensing unit (2) is extended out of a certain distance of a slit, so that oblique incident light passing through any point of the cross section of the diaphragm (6) falls into the first rectangular plane sensing unit (1) and the second rectangular plane sensing unit (2) to form the closing of the light entering opening.
4. The dual wedge cavity absolute radiometer of claim 1, wherein the third rectangular planar sensing unit (3) is attached below the second rectangular planar sensing unit (2).
5. The double wedge chamber absolute radiometer of claim 1, characterized in that the first rectangular planar sensing unit (1) and the third rectangular planar sensing unit (3) each comprise a heat sink, a planar sensing layer, a planar heating layer and a light absorbing coating, which are connected in sequence from top to bottom as one, wherein:
the heat sink is stable in temperature, is connected with the first surface of the plane sensing layer and serves as a cold end of the plane sensing layer, and forms a sensing element with the plane sensing layer;
the planar heating layer is manufactured by adopting a thin film flexible circuit and is tightly connected to the second surface of the planar sensing layer, a loop is formed in the thin film flexible circuit, temperature rise is generated in the loop through current, temperature rise caused by radiation is simulated, an electric heating function is provided for the absolute radiometer, and optical power is equivalently replaced by electric power;
the light absorption coating is made of a functional material capable of absorbing light radiation, is coated on one side, away from the plane sensing layer, of the plane heating layer, and is used for absorbing and converting the light radiation into heat to form temperature rise.
6. The double-wedge-cavity absolute radiometer according to claim 1, characterized in that the second rectangular planar sensing unit (2) and the fourth rectangular planar sensing unit (4) each comprise a heat sink, a planar sensing layer, a planar heating layer and a light absorbing coating, which are connected in sequence from bottom to top as a whole.
7. The dual wedge cavity absolute radiometer of claims 5 or 6,
the heat sink is made of copper, aluminum, iron or alloy materials with high heat conductivity and high heat capacity;
the planar heating layer is manufactured on the second surface of the planar sensing layer by adopting a polyester fiber flexible circuit, conductive silver paste and an enameled wire coil or directly coating;
the heat sink, the plane sensing layer and the plane heating layer are connected or welded by adopting heat conducting glue.
8. The double wedge cavity absolute radiometer according to claim 5 or 6, characterized in that the reflective support (5) is further connected to both sides of the heat sink for fixation of the components of the double wedge cavity absolute radiometer to each other; at the same time, the inner wall of the reflective support (5) has a broadband high reflectivity and reflects the optical radiation escaping from the light-absorbing coating back to the light-absorbing coating again with a higher reflectivity, thereby increasing the cavity absorption.
9. The dual wedge chamber absolute radiometer of claim 1, wherein the diaphragm (6) has a diameter smaller than 1/2 of the projection dimensions of the first and fourth rectangular planar sensing units in the direction of the diaphragm.
10. The dual wedge cavity absolute radiometer of claim 1, further comprising:
the intermediate layer (7) surrounds the outer sides of the first to fourth rectangular plane sensing units and the reflection support body (5) and is connected with the reflection support body (5), and a connecting point (9) is located on a midline of the first wedge cavity space and the second wedge cavity space and used for reducing the influence of heat convection and heat conduction; and
the shell (8), with interlayer (7) are connected, and tie point (9) are located first wedge chamber space with on the central line in second wedge chamber space for reduce thermal convection and heat-conducting's influence, and right the absolute radiometer of two wedge chambeies protects and supports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210637696.3A CN115014512A (en) | 2022-06-07 | 2022-06-07 | Double-wedge-cavity absolute radiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210637696.3A CN115014512A (en) | 2022-06-07 | 2022-06-07 | Double-wedge-cavity absolute radiometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115014512A true CN115014512A (en) | 2022-09-06 |
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ID=83072109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210637696.3A Pending CN115014512A (en) | 2022-06-07 | 2022-06-07 | Double-wedge-cavity absolute radiometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115014512A (en) |
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2022
- 2022-06-07 CN CN202210637696.3A patent/CN115014512A/en active Pending
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