A ground-based radiometer

Abstract

This invention discloses a radiometer, comprising a housing and a dustproof sleeve fixedly installed at the bottom of the housing. A dustproof aperture is fixedly installed inside the dustproof sleeve. The dustproof aperture has nine circumferentially distributed optical channel holes and three circumferentially distributed internally threaded seat holes. A locking assembly is disposed inside the internally threaded seat holes. The locking assembly includes a positioning sleeve seat, an adjusting block disposed inside the positioning sleeve seat, and a preload spring disposed inside the positioning sleeve seat. A positioning guide shaft is mounted on the upper end of the preload spring. In this invention, the dustproof sleeve is threadedly connected to the bottom of the housing, and the dustproof aperture is threadedly connected to the inside of the dustproof sleeve, improving installation efficiency and the convenience of after-sales maintenance of the optical window. No tools are required to disassemble any screws, and cleaning of the optical window glass after contamination is completed.

Description

Technical Field

[0001] This invention relates to the field of optical measurement technology, specifically to a ground radiometer. Background Technology

[0002] Earth radiometers are used for long-term, unattended, real-time measurements outdoors. Due to the location of some experimental sites in the field, where dust is prevalent, the light-entry point and optical window of the channel-type earth radiometer become covered in dust, requiring frequent and cumbersome lens cleaning. Furthermore, poor sealing of the earth radiometer leads to internal moisture absorption. This moisture inside the optical body affects the accuracy of data measurements, especially in areas with large diurnal temperature variations where moisture droplets can form on the optical window in the morning, interfering with the measurement of earth radiation data. Changes in the optical environment can also cause signal interference to the photoelectric detection elements, affecting the accuracy and scientific validity of the data measurements. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this invention provides a ground radiometer that solves the problems mentioned in the background section.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a radiometer comprising a housing and a dustproof sleeve fixedly installed at the bottom of the housing. A dustproof aperture is fixedly installed inside the dustproof sleeve. The dustproof aperture has nine circumferentially distributed optical channel holes and three circumferentially distributed internally threaded seat holes. A locking assembly is provided inside the internally threaded seat holes. The locking assembly includes a positioning sleeve seat, an adjusting block disposed inside the positioning sleeve seat, and a preload spring disposed inside the positioning sleeve seat. A positioning guide shaft is mounted on the upper end of the preload spring, and the upper end of the positioning guide shaft extends through to the outside of the positioning sleeve seat. An upper end cap is fixedly connected to the inner wall of the housing, and a recess is provided at the bottom of the housing, into which the positioning guide shaft is engaged.

[0007] Preferably, the outer casing houses an optical body, which includes an upper optical body sleeve, a lower optical body sleeve fixedly installed at the bottom of the upper optical body sleeve, and an upper optical body cover fixedly installed at the top of the upper optical body sleeve. The lower optical body sleeve houses a light-blocking wheel assembly, a stray-removing aperture, and a field-of-view aperture. The stray-removing aperture is located above the field-of-view aperture. The upper optical body sleeve houses a temperature control and data acquisition unit. The upper optical body sleeve has a special near-infrared channel, inside which is a detector heat sink. A detector is fixedly installed on the detector heat sink via a detector pressure plate. Detector pins pass through the detector heat sink and are connected to a detector circuit board. An aperture aperture is located below the detector, and a filter is located below the aperture aperture. The filter is fixed to the upper optical body sleeve by a filter fixing component. The filter and the filter fixing component are equipped with elastic elements for protecting the filter. The filter is located above the stray-removing aperture.

[0008] Preferably, the light-blocking wheel assembly includes a motor fixing plate, a motor fixedly installed at the bottom of the motor fixing plate, and a light-blocking wheel fixed to the output end of the motor. The light-blocking wheel has nine circumferentially distributed through holes, and a Hall switch is provided inside the upper optical main body sleeve.

[0009] Preferably, a light window seat is fixedly installed at the bottom end of the lower optical main body sleeve, a light window glass is embedded in the light window seat, and a sealing gasket is provided between the lower optical main body sleeve and the light window seat.

[0010] Preferably, the upper optical body sleeve has a wiring hole.

[0011] Preferably, the top of the outer shell is provided with a temperature difference cooler protective inner shell, the temperature difference cooler is provided inside the temperature difference cooler protective inner shell, the temperature difference cooler protective outer shell is provided outside the temperature difference cooler protective inner shell, and a rain cover is provided outside the temperature difference cooler protective outer shell.

[0012] Preferably, a sealing element is provided between the upper optical main body sleeve and the lower optical main body sleeve.

[0013] Preferably, thermal insulation cotton is provided between the optical body and the outer shell.

[0014] (III) Beneficial Effects

[0015] This invention provides a ground radiometer with the following advantages:

[0016] 1. In this invention, the dustproof sleeve is threaded to the bottom of the outer shell, and the dustproof aperture is threaded to the inside of the dustproof sleeve. This improves the convenience of installation and after-sales maintenance of the light window, eliminating the need to remove any screws with any tools to complete the cleaning operation after the light window glass becomes contaminated. The combination of the dustproof sleeve and the nine-hole dustproof aperture ensures that the direct contact area between the light window glass and the outdoors is reduced without affecting measurement, thereby reducing airborne dust pollution, interference with measurement, and extending the maintenance cycle. The contact fit between the positioning guide shaft and the concave hole achieves concentricity and alignment of the nine holes and nine channels of the dustproof aperture. Specifically, after all three locking components are installed on the dustproof aperture, the entire assembly is inserted into the dustproof sleeve, and the end of the dustproof sleeve is screwed into the rotating outer shell, allowing the positioning guide shaft to enter the concave hole. The locking adjustment block increases the preload and also increases the pressure on the external threads of the positioning sleeve and the internal threads of the dustproof aperture, improving the frictional self-locking effect.

[0017] 2. In this invention, a sealing gasket is provided between the lower optical main body sleeve and the light window seat, and a sealing element is provided between the upper optical main body sleeve and the lower optical main body sleeve to solve the problem of water and air leakage in the connection and avoid affecting the use of the element; the curing and sealing bonding between the light window base and the light window glass, and the stepped hole design of the light window base, firstly guides the positioning of the light window glass, and then leaves a glue injection groove of a certain width and thickness to improve the bonding firmness and reliability of the light window glass, and further increase the sealing performance.

[0018] 3. This invention adds a temperature difference cooler and a light-blocking wheel assembly for overall temperature control of the optical head body, and optimizes the heat conduction structure of the special near-infrared channel that is greatly affected. This eliminates measurement data errors caused by detector temperature drift effect, and the normalization of the data facilitates statistical analysis and application. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the overall assembly structure of a ground radiometer proposed in this invention;

[0020] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0021] Figure 3 This is a three-dimensional structural diagram of a dust-proof sleeve for a ground radiometer proposed in this invention;

[0022] Figure 4 This is a front view of the optical main body structure of a ground radiometer proposed in this invention;

[0023] Figure 5 This is a right-side cross-sectional view of the optical main body of a ground radiometer proposed in this invention;

[0024] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0025] Figure 7 This is a structural diagram of a light-blocking wheel assembly for a ground radiometer proposed in this invention;

[0026] Figure 8 for Figure 4 CC cross-sectional view;

[0027] Figure 9 for Figure 5 Enlarged structural diagram at point D.

[0028] In the diagram: 1. Outer shell; 2. Dustproof sleeve; 3. Dustproof aperture; 4. Upper end cover; 5. Optical body; 51. Upper optical body sleeve; 511. Temperature control and data acquisition unit; 512. Detector circuit board; 513. Detector heat sink; 514. Detector pressure plate; 515. Detector; 516. Filter; 517. Aperture stop; 518. Wiring hole; 519. Elastic element; 520. Filter fixing component; 52. Lower optical body sleeve; 521. Impurity removal aperture; 522. Field of view aperture. 53. Optical main body cover; 54. Light-blocking wheel assembly; 541. Motor mounting plate; 542. Light-blocking wheel; 5421. Through hole; 543. Motor; 55. Sealing element; 56. Sealing gasket; 57. Light window glass; 58. Light window seat; 59. Hall switch; 6. Insulation cotton; 7. Locking assembly; 71. Adjusting block; 72. Pre-tightening spring; 73. Positioning sleeve seat; 74. Positioning guide shaft; 8. Rain cover; 9. Thermostatic cooler; 10. Thermostatic cooler protective inner shell; 11. Thermostatic cooler protective outer shell. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Please see Figures 1 to 9The present invention provides a technical solution: a radiometer, comprising a housing 1, a dustproof sleeve 2 fixedly installed at the bottom of the housing 1, a dustproof aperture 3 fixedly installed inside the dustproof sleeve 2, the dustproof aperture 3 having nine circumferentially distributed optical channel holes, the dustproof aperture 3 also having three circumferentially distributed internal threaded seat holes, a locking assembly 7 provided inside the internal threaded seat holes, the locking assembly 7 including a positioning sleeve seat 73, an adjusting block 71 disposed inside the positioning sleeve seat 73, a pre-tightening spring 72 disposed inside the positioning sleeve seat 73, a positioning guide shaft 74 mounted on the upper end of the pre-tightening spring 72, the upper end of the positioning guide shaft 74 extending through to the outside of the positioning sleeve seat 73; an upper end cover 4 fixedly connected to the inner wall of the housing 1, a recessed hole opened at the bottom of the housing 1, the positioning guide shaft 74 being engaged in the recessed hole.

[0031] Three positioning sleeve seats 73 are screwed into the internal thread seat holes. Then, the dustproof aperture 3 is installed into the dustproof sleeve 2 as a whole. The end of the dustproof sleeve 2 is screwed into the rotating housing 1, so that the positioning guide shaft 74 enters the concave hole under the thrust of the preload spring 72, thus achieving the purpose of connecting and installing the dustproof sleeve 2 and the housing 1. Since the adjusting block 71 is threadedly connected to the positioning sleeve seat 73, rotating the adjusting block 71 increases the preload force and also increases the pressure of the external thread of the positioning sleeve seat 73 and the internal thread of the dustproof aperture 3, thereby improving the friction self-locking effect.

[0032] The outer casing 1 houses an optical body 5, which includes an upper optical body sleeve 51, a lower optical body sleeve 52 fixedly installed at the bottom of the upper optical body sleeve 51, and an optical body cover 53 fixedly installed at the top of the upper optical body sleeve 51. The lower optical body sleeve 52 houses a light-blocking wheel assembly 54, and also houses a stray-removing aperture 521 and a field-of-view aperture 522. The stray-removing aperture 521 is located above the field-of-view aperture 522. The upper optical body sleeve 51 houses a temperature control and data acquisition unit 511. The upper optical body sleeve 51 has a special near-infrared channel. The outer channel is equipped with a detector heat sink 513. A detector 515 is fixedly mounted on the detector heat sink 513 by a detector pressure plate 514. The pins of the detector 515 pass through the detector heat sink 513 and are connected to the detector circuit board 512. An aperture stop 517 is provided below the detector 515. A filter 516 is provided below the aperture stop 517. The filter 516 is fixed on the upper optical body sleeve 51 by a filter fixing member 520. An elastic element 519 is provided between the filter 516 and the filter fixing member 520 for the protection of the filter 516. The filter 516 is located above the anti-stray stop 521.

[0033] Detector 515 is a cooled detector. The heat generated by detector 515 is rapidly conducted to the detector heat sink 513, and then quickly directed to the upper surface of the upper optical body sleeve 51, increasing the heat dissipation area and efficiency. The optical body 5 is insulated from the outside by thermal insulation cotton 6, and has a thermoelectric cooler 9 on top, which is a semiconductor cooling device with Peltier effect, capable of heating or cooling the optical body 5. The thermoelectric cooler 9 is controlled by the temperature control and data acquisition unit 511. The heat generated by detector 515 itself is quickly dissipated to the optical body 5, and the heat is transferred to the thermoelectric cooler 9. By changing the active heat dissipation heat conduction method, the cooling efficiency of the cooled detector is improved, thereby improving the temperature control effect and reducing temperature interference with the measurement signal.

[0034] The upper optical body sleeve 51 has a hollow structure, which facilitates the routing of the temperature control and data acquisition unit 511 to the plug position. The temperature control and data acquisition unit 511 is used to acquire light signals and regulate the temperature of the optical body 5.

[0035] The anti-stray aperture 521 and field aperture 522 of each channel constitute an optical path system for the incident light channel with a certain field of view. The front end face of the lower optical main body sleeve 52 is a pseudo-conical hole, and there is a light channel system with 9 channels evenly distributed along the circumference. The middle and rear part is a structure with a countersunk hole, which perfectly embeds the motor 543 inside, improving the space utilization of the equipment and making the equipment more compact.

[0036] The split design of the upper optical main body sleeve 51 greatly reduces the difficulty of processing and improves processing accuracy and efficiency. The upper optical main body sleeve 51 and the lower optical main body sleeve 52 are precisely positioned by a centering structure with tight tolerance fit and an axial positioning block device, which accurately positions the concentricity of the upper optical main body sleeve 51 and the lower optical main body sleeve 52 and the concentricity requirements of each channel, and also prevents errors in channel alignment due to misoperation.

[0037] The light-blocking wheel assembly 54 includes a motor mounting plate 541, a motor 543 fixedly mounted on the bottom of the motor mounting plate 541, and a light-blocking wheel 542 fixed to the output end of the motor 543. The light-blocking wheel 542 has nine circumferentially distributed through holes 5421, and a Hall switch 59 is provided inside the upper optical body sleeve 51.

[0038] Hall switch 59 is fixed at its theoretical position at the bottom of upper optical body sleeve 51, used as the initial reset position signal excitation input for the motion control of light-blocking wheel 542. The nine through holes 5421 of the light-blocking wheel are evenly distributed with an average interval of 40 degrees; their radial distribution positions are consistent with the nine optical path holes of the upper optical body sleeve 51. The initial reset position is the theoretical blocking position; each reset is the blocking position, at which point no light enters, and the detector measures the body signal of the optical body 5 at this time. Then, the light-blocking wheel is rotated 20 degrees to align the light-transmitting hole with the nine channels, allowing the light path to enter the detector 515. The difference between the photoelectric signals measured by the nine channels and the photoelectric signals generated by the incident light is the net photoelectric signal at this time, eliminating the interference of the body signal and avoiding measurement errors caused by changes in the body signal.

[0039] A light window seat 58 is fixedly installed at the bottom of the lower optical main body sleeve 52. A light window glass 57 is embedded in the light window seat 58. A sealing gasket 56 is provided between the lower optical main body sleeve 52 and the light window seat 58.

[0040] A sealing gasket 56 is provided between the lower optical main body sleeve 52 and the light window seat 58. The light window seat 58 and the light window glass 57 are cured and sealed together. The stepped hole design of the light window seat 58 first guides the positioning of the light window glass 57, and then leaves a glue injection groove of a certain width and thickness to improve the bonding strength and reliability of the light window glass 57 and further increase the sealing performance.

[0041] A wiring hole 518 is provided on the upper optical body sleeve 51.

[0042] All the wiring for communication between the optical body 5 and external connections is ultimately concentrated at the wiring hole 518 of the upper optical body sleeve 51. The connection wires of the temperature control and data acquisition unit 511 are led to this position and exit to the plug and external connection. This centralized wiring method facilitates sealing management. The sealing wiring exit point is narrow and compact. After the wires are concentrated inside the optical body, the area is sealed and potted with glue.

[0043] The outer shell 1 has a thermostatic cooler protective inner shell 10 embedded at the top, a thermostatic cooler 9 is installed inside the thermostatic cooler protective inner shell 10, a thermostatic cooler protective outer shell 11 is installed outside the thermostatic cooler protective inner shell 10, and a rain cover 8 is installed outside the thermostatic cooler protective outer shell 11.

[0044] An axial sealing structure was designed at the contact point between the inner protective shell 10 of the thermostatic cooler and the upper surface of the optical body 5, and a sealing element was installed to prevent water and air from passing through the hole at the top of the optical body 5.

[0045] A sealing element 55 is provided between the upper optical body sleeve 51 and the lower optical body sleeve 52 to solve the problem of water and air leakage during connection.

[0046] A heat-insulating cotton 6 is installed between the optical main body 5 and the outer shell 1. The heat-insulating cotton 6 provides insulation between the optical main body 5 and the outside environment. This tight wrapping also serves as a supplementary seal, further enhancing the internal sealing of the optical main body. This completely isolates the interior from the outside, preventing the exchange of substances.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A radiometer for observing Earth's surface, characterized in that: The device includes an outer shell (1) and a dustproof sleeve (2) fixedly installed at the bottom of the outer shell (1). A dustproof aperture (3) is fixedly installed inside the dustproof sleeve (2). The dustproof aperture (3) has nine circumferentially distributed light channel holes. The dustproof aperture (3) also has three circumferentially distributed internal thread seat holes. A locking assembly (7) is provided inside the internal thread seat holes. The locking assembly (7) includes a positioning sleeve seat (73), an adjusting block (71) disposed inside the positioning sleeve seat (73), and a pre-tightening spring (72) disposed inside the positioning sleeve seat (73). A positioning guide shaft (74) is installed on the upper end of the pre-tightening spring (72). The upper end of the positioning guide shaft (74) extends through to the outside of the positioning sleeve seat (73). An upper end cover (4) is fixedly connected to the inner wall of the outer shell (1). A concave hole is opened at the bottom of the outer shell (1). The positioning guide shaft (74) is engaged in the concave hole. The outer shell (1) contains an optical body (5), which includes an upper optical body sleeve (51), a lower optical body sleeve (52) fixedly installed at the bottom of the upper optical body sleeve (51), and an optical body cover (53) fixedly installed at the top of the upper optical body sleeve (51). The lower optical body sleeve (52) contains a light-blocking wheel assembly (54). The lower optical body sleeve (52) also contains a stray-eliminating aperture (521) and a field-view aperture (522). The stray-eliminating aperture (521) is located above the field-view aperture (522). The upper optical body sleeve (51) contains a temperature control and data acquisition unit (511). The upper optical body sleeve (51) has a special near-infrared channel. The channel is equipped with a detector heat sink (513), and a detector (515) is fixedly mounted on the detector heat sink (513) by a detector pressure plate (514). The pins of the detector (515) pass through the detector heat sink (513) and are connected to a detector circuit board (512). An aperture stop (517) is provided below the detector (515), and a filter (516) is provided below the aperture stop (517). The filter (516) is fixed on the upper optical body sleeve (51) by a filter fixing member (520). An elastic element (519) is provided between the filter (516) and the filter fixing member (520) for protecting the filter (516). The filter (516) is located above the anti-pollution stop (521).

2. The earth radiometer according to claim 1, characterized in that: The light-blocking wheel assembly (54) includes a motor fixing plate (541), a motor (543) fixedly installed at the bottom of the motor fixing plate (541), and a light-blocking wheel (542) fixed at the output end of the motor (543). The light-blocking wheel (542) has nine circumferentially distributed through holes (5421). The upper optical body sleeve (51) is equipped with a Hall switch (59).

3. A radiometer according to claim 1, characterized in that: The bottom end of the lower optical main body sleeve (52) is fixedly installed with a light window seat (58), and a light window glass (57) is embedded in the light window seat (58). A sealing gasket (56) is provided between the lower optical main body sleeve (52) and the light window seat (58).

4. A radiometer according to claim 1, characterized in that: The upper optical main body sleeve (51) has a wiring hole (518).

5. A radiometer according to claim 1, characterized in that: The top of the outer shell (1) is fitted with a temperature difference cooler protective inner shell (10), the temperature difference cooler (9) is installed inside the temperature difference cooler protective inner shell (10), the temperature difference cooler protective outer shell (11) is installed outside the temperature difference cooler protective inner shell (10), and a rain cover (8) is installed outside the temperature difference cooler protective outer shell (11).

6. A radiometer according to claim 1, characterized in that: A sealing element (55) is provided between the upper optical main body sleeve (51) and the lower optical main body sleeve (52).

7. A radiometer according to claim 1, characterized in that: Insulating cotton (6) is provided between the optical body (5) and the outer shell (1).

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