CN218411451U - Infrared radiation calibration device for black body replaceable window at lens cap - Google Patents
Infrared radiation calibration device for black body replaceable window at lens cap Download PDFInfo
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- CN218411451U CN218411451U CN202222258409.6U CN202222258409U CN218411451U CN 218411451 U CN218411451 U CN 218411451U CN 202222258409 U CN202222258409 U CN 202222258409U CN 218411451 U CN218411451 U CN 218411451U
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- black body
- infrared radiation
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Abstract
The utility model belongs to the technical field of equipment calibration, in particular to an infrared radiation calibration device and a calibration method of a black body replaceable window at a lens cap, which are used for calibrating infrared radiation measurement equipment, wherein the infrared radiation measurement equipment comprises a telescope lens cone, and the device comprises a cylinder (8), a lens cap (1), a black body (3) and a bracket (4); the telescope comprises a cylinder (8), a lens cover (1), a replacing plate, a window (2), a support (4), a black body (3), a moving mechanism and a moving mechanism, wherein the cylinder (8) is sleeved on the outer edge of the front end of a lens barrel (6) of the telescope, the lens cover (1) covers the caliber of the cylinder (8), the replacing plate and the window (2) are arranged on the lens cover (1), the support (4) is arranged in front of the lens cover (1), the black body (3) is arranged on the support (4), and the black body (3) can move back and forth on the support (4) to be conveniently moved in or taken out; the utility model discloses a calibration method changes black body input device's infrared radiant quantity through changing the window size, and calibration speed is fast.
Description
Technical Field
The utility model belongs to the technical field of equipment is markd, in particular to infrared radiation calibration device that window can be replaced to lens cap department black body.
Background
At present, infrared radiation measuring equipment mostly adopts a full-caliber or partial-caliber blackbody or the blackbody + collimator to calibrate infrared radiation, the temperature of the blackbody is adjusted to change the infrared radiation quantity of input equipment, the temperature rise and fall time of the blackbody is longer, and a faster infrared radiation calibration device and method are needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art's defect, provided infrared radiation measuring equipment calibration device and method based on black body multiple window.
In order to achieve the above object, the utility model provides an infrared radiation calibration device of window can be replaced to black body of lens cap department for demarcate infrared radiation measuring equipment, infrared radiation measuring equipment includes the telescope lens cone, its characterized in that, the device includes drum, lens cap, black body and support; the cylinder is sleeved on the outer edge of the front end of the telescope lens cone, the lens cover covers the caliber of the cylinder, a plurality of windows are arranged on the lens cover, the support is arranged in front of the lens cover, the black body is arranged on the support, and the black body can be moved in or taken out.
As an improvement of the device, a guide ring is arranged on the inner side of the lens cap close to the end opening of the cylinder;
and a locking mechanism is arranged at the edge of the port of the cylinder, and a positioning pin matched with the locking mechanism is arranged on the lens cover.
As an improvement of the device, the lens cover is made of light materials and is externally attached with a heat insulation layer.
As an improvement of the device, each window (3) avoids the secondary mirror bracket, and the maximum temperature response of the black body when all windows are opened is close to the saturation state under the minimum exposure condition.
As an improvement of the device, the device also comprises a window cover, and after the window cover closes the window, the inner side of the lens cover is flat and consistent in shape.
An infrared radiation calibration method for a blackbody replaceable window at a lens cover is realized based on the device, and comprises the following steps:
setting the temperature of the black body as t1, and moving the black body into the front lens cover fixing support; measuring the radiation brightness L corresponding to the black body temperature t1 t1 ；
Setting the window state to be the first state, and setting the effective aperture ratio of the pixel n to be S n1 Obtaining a response gray scale D corresponding to the window state at the blackbody temperature t1 by the infrared radiation measuring equipment n11 ；
Setting the window state to be the second state, and setting the effective aperture ratio of the pixel n to be S n2 Obtaining the response gray scale D corresponding to the window state at the black body temperature t1 n12 ；
Setting the temperature of the black body as t2, and moving the black body into the front lens cover fixing support; measuring to obtain the radiance L corresponding to the blackbody temperature t2 t2 ；
Setting the window state to be the first state, and setting the effective aperture ratio of the pixel n to be S n1 Obtaining the response gray scale D corresponding to the window state and the black body temperature t2 n21 ；
Setting the window state to be the second state, and setting the effective aperture ratio of the pixel n to be S n2 Obtaining the response gray scale D corresponding to the window state and the black body temperature t2 n22 ；
And according to the two groups of window states and response gray scale and radiation brightness obtained by measuring the two black body temperatures, obtaining a response slope and an intercept according to a simultaneous equation of a linear response model, thereby completing calibration.
As an improvement of the above method, the response slope K n Satisfies the following formula:
as a modification of the above method, the intercept c satisfies the following equation:
c＝D n11 -K n [S n1 L t1 +(1-S n1 )L s ]
wherein L is s For the lens cap radiance, the following equation is satisfied:
compared with the prior art, the utility model has the advantages of:
1. the calibration device of the utility model uses a part of caliber black body, and the calibration mechanism is small and exquisite;
2. the utility model discloses a calibration method changes black body input device's infrared radiant quantity through changing the window size, and it is fast to mark.
Drawings
Fig. 1 is a front view of the calibration device of the present invention;
fig. 2 is a side view of the calibration device of the present invention;
fig. 3 is a schematic view of the window cover of the calibration device of the present invention.
Reference numerals
1. Lens cap 2, replacing plate and window 3, black body
4. Support 5, fixing mechanism 6 and lens barrel
7. Thermal insulation board 8, cylinder
Detailed Description
1. Lens cap multi-window + black body structure
As shown in fig. 1, the lens cover adopts a split design, a replacement plate with different window sizes is used on a certain segment, and a structural form of a small black body is additionally arranged in front of the window.
(1) Lens cap and split
The lens cover is divided into more than 2 parts, has stronger rigidity and does not deform after being used for a long time; the inner side is smooth after installation, and the surface is uniform without mirror reflection; the outer surface of the lens cover is coated with a heat-insulating material, so that the heating effect of a black body on the lens cover is avoided; the lens cover is provided with a positioning pin mechanism, and each segment of the lens cover is arranged on the lens with higher repetition precision.
(2) Substitute board and window
A replacing plate mounting groove is formed in one of the lens covers and used for mounting a replacing plate, or the split whole is used as a replacing plate; each replacement plate is correspondingly provided with windows with different sizes in the center of the effective radiation aperture of the black body, the maximum window is not larger than the effective radiation aperture of the black body, and one replacement plate is not provided with the window; the inner side of the replacement plate is consistent with the inner side of the lens cover after the replacement plate is covered, and the outer side of the replacement plate is coated with a heat insulation material.
(3) Heat insulation board
The heated board uses light heat preservation as the key, and the area is greater than black body mechanism, inserts isolated black body heating effect between black body and the lens cap during non-operation.
(4) Support and fixing mechanism
The black body is arranged on a bracket on the front outer side of the lens cone, the bracket is fixedly connected with the lens cone, the bracket can be repeatedly disassembled, and the position and the angle of the bracket have better repetition precision; the support does not deform after bearing the black body, and the black body can slide a certain distance back and forth on the support, so that the window cover can be conveniently disassembled, assembled and inserted into the heat insulation plate; the position of the black body close to the lens cover is provided with a black body fixing mechanism, and the black body fixing mechanism has higher repetition precision.
2. Basic model of infrared radiation response
For device infrared radiation measurementWave band normalization linear full-aperture response model of certain pixel n of camera [1～3] Is provided with
D n ＝KL+c (1)
Wherein Dn is a band comprehensive response gray value, L is normalized or equivalent radiance, K is a radiance response coefficient of the pixel, and c is a response gray value with zero input.
Corresponding to the calibration of a full-aperture diffuse reflection plate, the combined aperture radiation input of a black body and a background meets the energy superposition relation for a certain pixel n of an infrared detector of the equipment to receive radiation outside the equipment, and
L nr ＝L t S nt +L b (1-S nt ) (2)
wherein L is nr For radiation received by picture element n, L t Is black body radiation, L b For background radiation, S nt Is the effective clear area ratio of diffuse black body radiation of the pixel n, S nt And the full caliber is 1.
Then the pixel n part aperture response linear model is:
D n ＝K[L t S nt +L b (1-S nt )]+c (3)
the technical solution of the present invention will be described in detail with reference to the accompanying drawings and examples.
Examples
As shown in fig. 1, embodiment 1 of the present invention provides an infrared radiation calibration apparatus with a black body replaceable window at a lens cap, which is used for calibrating an infrared radiation measurement device, wherein the infrared radiation measurement device comprises a telescope lens barrel. Fig. 2 is a side view of the calibration device, and fig. 3 is a schematic view of the window cover.
The device is used for calibrating the infrared radiation measuring equipment, and the infrared radiation measuring equipment comprises a telescope lens cone and is characterized in that the device comprises a cylinder 8, a lens cover 1, a black body 3 and a bracket 4; the cylinder 8 is sleeved on the outer edge of the front end of a lens barrel 6 of the telescope, the lens cover 1 covers the caliber of the cylinder 8, the replacement plate and the window 2 are arranged on the lens cover 1, the support 4 is arranged in front of the lens cover 1, the black body 3 is arranged on the support 4, and the black body 3 can move back and forth on the support 4 and is convenient to move in or take out.
The lens cap 1 comprises more than 2 segments, the material of the lens cap meets the set rigidity requirement, the inner side is flat, and the surface is uniform and has no mirror reflection. A plate replacing installation groove is formed in one split lens cover and used for installing a replacing plate, or the split whole body serves as the replacing plate, the inner side of the replacing plate is consistent with the inner side of the lens cover after the replacing plate is covered, and heat insulation materials are coated on the outer side of the replacing plate.
The area of the heat insulation plate 7 is larger than that of the black body 3, and the heat insulation plate is inserted between the black body 2 and the lens cover 1 during non-working period to isolate the heating effect of the black body.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art will understand that modifications and equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of them shall fall within the scope of the claims of the present invention.
Claims (7)
1. An infrared radiation calibration device of a blackbody replaceable window at a lens cover is used for calibrating infrared radiation measurement equipment, wherein the infrared radiation measurement equipment comprises a telescope lens cone, and is characterized in that the device comprises a cylinder (8), the lens cover (1), a blackbody (3) and a support (4); the lens barrel (6) of the telescope is sleeved on the front end outer edge of the cylinder (8), the lens cover (1) covers the caliber of the cylinder (8), the replacement plate and the window (2) are arranged on the lens cover (1), the support (4) is arranged in front of the lens cover (1), the black body (3) is arranged on the support (4), and the black body (3) can move back and forth on the support (4) and is convenient to move in or out.
2. The apparatus for calibrating infrared radiation of a blackbody replaceable window at a lens cover according to claim 1, wherein the lens cover (1) comprises more than 2 segments, the material of the lens cover meets the set rigidity requirement, the inner side is flat, and the surface is uniform and has no specular reflection.
3. The apparatus for calibrating infrared radiation of a blackbody replaceable window at a lens cover as claimed in claim 2, wherein a replacement plate mounting groove is provided on a split lens cover for mounting a replacement plate, or the split lens is integrally used as a replacement plate, the inner side of the replacement plate after covering is consistent with the inner side of the lens cover, and the outer side is coated with a thermal insulation material.
4. The apparatus for calibrating infrared radiation of a window replaceable by a black body at a lens cover as claimed in claim 3, wherein one of the replacement plates is not opened, and the other replacement plates are opened with windows of different sizes at the center of the effective radiation aperture of the black body, and the maximum window size is not larger than the effective radiation aperture of the black body.
5. The device for calibrating the infrared radiation of the blackbody replaceable window at the lens cover as claimed in claim 1, wherein the outer surface of the lens cover (1) is coated with a thermal insulation material.
6. The device for calibrating the infrared radiation of the blackbody replaceable window at the lens cover according to claim 1, further comprising a heat insulation plate (7), wherein the area of the heat insulation plate (7) is larger than that of the blackbody (3), and the heat insulation plate is inserted between the blackbody (3) and the lens cover (1) during non-operation to isolate the heating effect of the blackbody.
7. The apparatus for calibrating infrared radiation of a blackbody replaceable window at a lens cover according to claim 1, further comprising a fixing mechanism (5) disposed at a position where the blackbody (3) is close to the lens cover (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222258409.6U CN218411451U (en) | 2022-08-26 | 2022-08-26 | Infrared radiation calibration device for black body replaceable window at lens cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222258409.6U CN218411451U (en) | 2022-08-26 | 2022-08-26 | Infrared radiation calibration device for black body replaceable window at lens cap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218411451U true CN218411451U (en) | 2023-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222258409.6U Active CN218411451U (en) | 2022-08-26 | 2022-08-26 | Infrared radiation calibration device for black body replaceable window at lens cap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218411451U (en) |
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2022
- 2022-08-26 CN CN202222258409.6U patent/CN218411451U/en active Active
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