JPS60211274A - Radiational cooler - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (a) Technical field of the invention The present invention prevents outgas generated from inside a radiation cooler mounted on an artificial satellite in outer space from adhering to the optical system of an infrared detector. The present invention relates to an improvement of the radiation cooler.

(1)) Background of the technology Infrared detectors for infrared cameras mounted on recent resource exploration satellites use photoreceptor type detection elements that utilize multi-component semiconductors such as HgCdTe. Although these detectors are highly sensitive and have a fast response time, they must be cooled to an ultra-low temperature of around 100 K in order to fully demonstrate their performance. The transmission of infrared rays must not be obstructed by Therefore, there is a strong demand for the development of a radiation cooler that has good heat radiation efficiency and is less affected by outgas.

(0) Prior art and problems Figure 1 is a schematic diagram showing a radiation cooler mounted on an artificial satellite together with the earth. In the figure, l is the earth, 2 is the satellite body, 8 is the scanning mirror, 4 is the infrared detector, and 5 is the first
A cooling plate, 6 a reflecting plate, 15 a second cooling plate, 7 a shield plate, 8 earth radiant heat, 9 an infrared ray, and a TOTI insulation material, respectively.

As shown in Figure 1, the radiation cooler is mounted on the satellite main body 2.
l! It is incident from the surface of the earth l in the direction of arrow A,
An infrared detector 4 for observing nine infrared waves reaching an infrared detector 4 via a scanning mirror 3 attached to an Ips star 2, and a thermal radiation detector 4 to outer space (environmental temperature 4K). a first cooling temporary 5 and a second cooling plate 15 supported to cool to an ultra-low temperature of too K or less;
Solar radiant heat, earth albedo, earth radiant heat 8 @ 111I for earth radiant heat 8 written by t+fJ, which almost completely blocks incident heat rays from the outside and enters from the direction of arrow B, for example.
+([:!Reflector 6 and seed μ-seed plate 7 that are reflected several times by the reflector 6 as shown by the arrow and radiate back into space.
It consists of As described above, the structure is such that the infrared rays 9 incident on the artificial satellite main body 2 are observed by the infrared detector 4 to investigate the state of resources with the earth. However, with conventional radiation coolers, the satellite body 2
(Environmental temperature 20tlj = 298 K) A heat insulating material 10 is filled in the large area to avoid the thermal influence, and outgas 13 generated from the insulating material 10 is transmitted to the optical system such as the infrared transmitting window of the detector 4. This adhesion is a major factor in deteriorating the performance of the detector 4.

(d) Purpose of the Invention In view of the shortcomings of the prior art mentioned above, the present research has been made to prevent outgas generated from V1 heat removal from adhering to the optical system of an infrared detector, and to reduce the cooling capacity of the infrared detector. The purpose of this invention is to provide a radiant cooler structure that does not need to be used.

(e) Structure and purpose of the investigation: an infrared detector mounted on an artificial satellite to detect infrared rays incident from a target; a cooling plate that supports the detection KH and has a heat dissipation surface facing toward outer space; In a radiation cooler comprising a reflection plate extending toward outer space in front of the cooling plate, after folding the opening periphery of the reflection plate into a chevron shape, This is achieved by providing a radiation cooler which is continuous with the second cooling plate part and is characterized in that a ventilation hole is provided in the folded surface of the peripheral edge of the cooling plate.

(f) Examples of the invention An embodiment of the present invention will be described in detail below with reference to the drawings.

Figure 2 is a side view for explaining the structure and 1i41I production of the radiation cooler according to the present invention.
4 is 1111 pores provided on the slope of the reflector that formed a mountain shape;
Reference numerals 16 and 16 indicate reflective plates each having a chevron shape. Furthermore, since this study aims to prevent outgas from reaching the infrared detector by improving the structure of the reflector 6, we will provide detailed explanations and avoid overlapping explanations with Figure M to avoid complication. Omitted for brevity.

As shown in FIG. 2, in the radiation cooler of the present invention, not only is the reflecting plate 16 formed in the shape of an opening expanding outward from the outer periphery of the cooling plate 5 as in the conventional case, but also the opening periphery is It has a structure in which it is bent back in the opposite direction and a vent hole t4t- is provided on the slope on the outer peripheral side of the chevron-shaped shape formed by the bending.

A second cooling plate portion 15 parallel to the first cooling plate 5 is provided in a continuous manner with the folded portion.

Therefore, the gas I and the gas la generated from the heat insulating material lO are emitted into space through the ventilation hole 14 provided diagonally in the reflection plate 6 as shown by arrows E, F, G, and H.

Note that the surrounding air holes 14 according to the present research are formed on the chevron-shaped υ-turned surface of the reflection plate 16, and do not affect the effective area of the second cooling plate 15, resulting in low heat dissipation efficiency. There isn't.

■ Effects of the Invention As explained in detail in the following section, the radiation cooler of the present invention has an improved structure of the reflector plate, so that the infrared radiation generated from inside the radiation cooler adheres to the optical system of the infrared detector and detects it. This has a great multiple effect of preventing the performance of the detector from deteriorating and improving the cooling function of the detector.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a radiation cooler mounted on an artificial satellite together with the earth, and FIG. 2 is a side sectional view showing the configuration of one embodiment of the radiation cooler of the present invention.

Claims (1)

[Claims] An infrared detector mounted on a satellite to detect infrared radiation from a target; a cooling plate that supports the detector and has a heat dissipation surface facing toward outer space; In a radiation cooler comprising a reflective plate with an expanded opening facing the opposite direction, the peripheral edge of the opening of the reflective plate is folded back into a chevron shape, and then connected to a second cooling plate part parallel to one batch of cooling plates. and d on the folded surface of the peripheral edge of the reflecting plate.
A radiation cooler characterized by the provision of pores.