JPH02201227A - Infrared detector - Google Patents

Abstract

PURPOSE:To achieve a smaller size of the apparatus by mounting a heat radiation fin on an input/output pin mounted on a Dewar vessel to cool the heat radiation fin by a cooling means. CONSTITUTION:A high pressure gas 8 with the same temperature as atm. is supplied to a mini cooler 7 and released from an orifice 9 at the tip thereof, when the gas lowers to a liquefaction temperature by a Joule Thomson effect to be liquefied. The liquefied gas 10 deprive heat of an inner top to be vaporized and as a result, an infrared detector 3 mounted on the inner top is cooled. The gas vaporized passes between radiation fins 12 mount on an input/output pin 5 and jetted out behind an inner Dewar vessel 2 in heat exchange with a high pressure gas 8 coming anew to be released into atmospheric air. This allows an input/output pin 5 to approach the infrared detector 3 thereby achieving a smaller size of the apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an infrared detection device equipped with cooling means for the infrared detector.

[Prior Art] Conventionally, an infrared detection device shown in FIG. 2 has been known.

That is, the outer deflector 1 and the inner deflector 2, each having a cylindrical shape with an open end and a bottom, are arranged coaxially to form a vacuum heat insulating layer therebetween. An infrared detector 3 is fixed to the bottom surface (inner top 2a) of the inner tube 2 inside the vacuum heat insulating layer. An infrared entrance window 4 is attached to the bottom of the outer duplex 1 facing the infrared detection surface of the infrared detector 3. The opening side of the inner deck 2 has a structure that is folded back to the outside, and this folded portion has a plurality of input/output pins 5 such that one end is located in the vacuum insulation layer and the other end is located outside the inner deck 2. is installed. One end of these input/output pins 5 and the infrared detector 3 are electrically connected by a lead wire 6. Further, a mini-cooler 7 is attached to the inner deck 2 from the opening side thereof.

In the infrared detector configured in this manner, the vacuum heat insulating layer composed of the outer deflector 1 and the inner deflector 2 prevents heat from entering the infrared detector 3 from the outside. Furthermore,
High-pressure gas 8 is introduced from the rear of the mini-cooler 7 and discharged from an orifice 9 provided at the tip of the mini-cooler 7 to liquefy the gas by the Joule-Thomson effect, and this liquefied gas 10 is sprayed onto the bottom of the inner deck 2. The infrared detector 3 is cooled via the inner dew 2. The liquefied gas 10 that has undergone heat exchange with the infrared detector 3 is discharged to the outside from the opening of the inner tube 2 as a blown gas 11.

[Problems to be Solved by the Invention] However, in the conventional infrared detection device described above, when the device is miniaturized, the distance between the input/output pin 5, which is not attached to the inner duplexer 2, and the infrared detector 3 is short. Become,
There was a problem in that the heat flowing in from the input/output pin 5 could no longer be ignored. Especially for infrared detectors for imaging.
Due to the extremely large number of input/output pins, the above heat intrusion was a more serious problem.

The present invention has been made in view of such problems, and includes:
It is an object of the present invention to provide an infrared detection device that can be miniaturized by preventing heat from entering through input/output pins.

[Means for Solving the Problems] An infrared detection device according to the present invention has an outer member and an inner member that are shaped like a bottomed cylinder with an open end and are coaxially disposed to form a vacuum heat insulating layer between the two. a deyuwa; an infrared detector disposed inside the vacuum insulation layer at a position in contact with the inner member; and an infrared detector inserted into the deyuwa so that one end is located in the vacuum insulation layer and the other end is located outside the deyuwa. an infrared detection device comprising a plurality of input/output pins, a lead wire connecting the one end of these input/output pins to the infrared detector, and a cooling device inserted into the dewar to cool the inner member, The invention is characterized in that it includes a radiation fin attached to the input/output pin and a part of which is cooled by the cooling device.

[Function] According to the present invention, a radiation fin is attached to the input/output pin,
Since a portion of this radiation fin is cooled by the cooling device, the heat of the input/output pin is radiated through this radiation fin. Therefore, the distance between the input/output pin and the infrared detector can be reduced, and the device can be miniaturized.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing the configuration of an infrared detection device according to an embodiment of the present invention. In FIG. 1, the same parts as in FIG. 2 are designated by the same reference numerals, and explanations of overlapping parts will be omitted.

This device differs from the conventional device shown in FIG. 2 in that a radiation fin 12 is attached to the input/output pin 5. One end of the heat radiation fin 12 extends to the vicinity of the insertion opening of the mini-cooler 7 in the inner deck 2, and this one end is cooled by the ejected gas 11.

Next, the operation of the infrared detection device configured as described above will be explained.

High-pressure gas 8 having the same temperature T^ as the atmospheric pressure is supplied to the mini-cooler 7, and is discharged from an orifice 9 at the tip of the mini-cooler 7.

At this time, due to the Joule-Thomson effect, the gas is lowered to the liquefaction temperature TL and liquefied. If the gas is nitrogen, this liquefaction temperature TL is 774. This liquefied gas 10 removes heat from the inner top 2a and is vaporized. As a result, the infrared detector 3 mounted on the inner top 2a is cooled. The vaporized gas passes between the radiating fins of the mini-cooler 7, and while exchanging heat with the newly incoming high-pressure gas 8, is ejected to the rear of the inner tank 2 and released into the atmosphere. At this time, if 100% heat exchange is performed between the vaporized gas and the high pressure gas 8, the temperature of the released gas will be T^, but generally the heat exchange rate is about 98
%, the ejected gas 11 is released into the atmosphere at a gas temperature that is sufficiently lower than the atmospheric temperature T^. Therefore, by blowing this ejected gas 11 onto the radiation fins 12 attached to the input/output pins 5, the heat flow from the input/output pins 5 to the inner top 2b is reduced.

[Effects of the Invention] As explained above, the present invention attaches heat radiation fins to the input/output pins attached to the dewar, and cools the radiation fins with a cooling means, thereby reducing heat from the input/output pins to the infrared detector. Inflow can be reduced. As a result,
An infrared detection device equipped with a large number of input/output pins for images can be miniaturized.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an infrared detection device according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional infrared detection device. 1; Outer valve, 2; Inner valve, 3; Infrared detector, 4; Infrared incidence window, 5; Input/output pin, 6; Lead wire, 7; Mini cooler, 8; High pressure gas, 9; Orifice, 1
0; Liquefied gas, 11; Blowing gas, 12; Radiation fin

Claims (1)

[Claims] (1) A dewar in which a bottomed cylindrical outer member with an open end and an inner member are arranged coaxially to form a vacuum heat insulating layer between the two, and a dewar contacts the inner member inside the vacuum heat insulating layer. a plurality of input/output pins inserted into the dewar and having one end located in the vacuum insulation layer and the other end located outside the dewar; and the one end of the input/output pins An infrared detection device comprising a lead wire connecting the infrared detector and a cooling device inserted into the dewar to cool the inner member, the infrared detection device being attached to the input/output pin and partially cooled by the cooling device. An infrared detection device characterized by being equipped with a heat dissipation fin.