JPH056336U - Infrared detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an infrared detector capable of always maintaining a stable cooling state of an infrared detection element which is operated by being cooled to an extremely low temperature (about 80 K). [Structure] The inner cylinder 7 on which the infrared detection element 6 is mounted has an extremely thin thickness and has a bellows-shaped cross section in the axial direction. Thereby the inner cylinder 7
The infrared detection element 6 is always kept in a good cooling state by increasing the thermal resistance value of the above and reducing the amount of heat penetration due to heat conduction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an infrared detector having an infrared detection element which is cooled to an extremely low temperature to operate.

[0002]

[Prior Art]

FIG. 2 is a cross-sectional view showing a conventional infrared detector. In FIG. 2, 1 is a cryostat, 2 is an inner cylinder, 3 is an outer cylinder, 4 is a flange, 5 is a window made of an infrared transparent material, Reference numeral 6 is composed of an infrared detecting element. The infrared element 6 is fixed to the end surface of the inner cylinder by, for example, soldering, and the window 5 is bonded to the end surface of the outer cylinder 3 with, for example, a vacuum adhesive, so that the outer cylinder 3 and the flange 4 are bonded together. The inner cylinder 2 is joined by, for example, laser welding. Here, the inside of the cryostat 1 is kept in a vacuum of about 10 ⁻³ to 10 ⁻⁵ Torr in order to block heat entering from the outside.

The operation of the conventional infrared detector having the above configuration will be described. By inserting a cooling device (not shown), such as a Joule-Thomson cooler, into the inner cylinder 2 and operating it, the infrared detecting element 6 can be cooled to an extremely low temperature of about 80 K, and is not shown. Infrared rays entering from the optical system pass through the window 5 and are converted into signals by the infrared detecting element 6. Infrared rays can be detected by sending the signal to an external signal processing circuit (not shown) through a wiring (not shown).

[0004]

[Problems to be solved by the device]

 The conventional infrared detector is configured as described above, and in order to drive the infrared detecting element, the detecting element must be cooled down to about 80K level. For that purpose, it was necessary to reduce the amount of heat entering the detector from the outside of the infrared detector, that is, the heat conduction from the inner cylinder and the heat radiation from the outer cylinder and the window.

The present invention was made to reduce the amount of heat penetration described above, and an infrared ray detector capable of maintaining a stable cooling state when the infrared detecting element is cooled to a very low temperature by a cooler. The purpose is to get.

[0006]

[Means for Solving the Problems]

 In the infrared detector according to the present invention, the inner cylinder on which the infrared detecting element is mounted is made extremely thin, and the axial cross section is formed into a bellows shape.

[0007]

[Action]

 As a heat conduction from the inner cylinder of the infrared detector configured as described above, the amount of heat entering the detecting element is reduced.

[0008]

【Example】

 Example 1. FIG. 1 is a cross-sectional view showing an embodiment of the present invention. Reference numerals 1, 3 to 6 are exactly the same as those of the conventional device, 7 is an inner cylinder, which is extremely thin and has a bellows-shaped cross section in the axial direction. And 6 infrared detection elements are mounted on the end face.

In the infrared detector configured as described above, when the infrared detecting element 6 is cooled to an extremely low temperature by a cooling device (not shown) like the conventional apparatus, the infrared detecting element 6 is The outer cylinder 3 and the window 5 receive heat radiation and the inner cylinder 7 receives heat due to heat conduction. In order to reduce the amount of heat intrusion due to heat radiation, it is possible to take measures such as plating with a small infrared emissivity from the outer cylinder 3 and the window. As a measure to reduce the amount of heat penetration due to heat conduction from the inner cylinder, use a material with low thermal conductivity, and further increase the length of the cryogenic part and the normal temperature part to increase the thermal resistance value. Therefore, the amount of heat penetration can be reduced. Therefore, the inner cylinder 7 has an extremely thin thickness and a bellows-shaped cross section in the axial direction, and the thermal resistance value is increased, so that the infrared detection element 6 can always be kept in a good cooling state.

[0010]

[Effect of the device]

 As described above, the present invention increases the thermal resistance value of the inner cylinder on which the infrared detecting element is mounted when the infrared detecting element mounted on the infrared detector is cooled to an extremely low temperature, thereby increasing the thermal conductivity. It is possible to reduce the amount of heat intrusion due to the above, and it is possible to always obtain a good cooling state of the infrared detection element.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional infrared detector.

[Explanation of symbols]

 1 Cryogenic Customer 2 Inner Cylinder 3 Outer Cylinder 4 Flange 5 Windu 6 Infrared Detector 7 Inner Cylinder

Claims (1)

[Claims for utility model registration] [Claim 1] An inner cylinder having an extremely thin thickness and a bellows-shaped cross section in the axial direction, an infrared detecting element mounted on one end surface of the inner cylinder, and the other inner cylinder. A flange provided at the end, an outer cylinder joined to join the outer peripheral portion of the flange and to cover the inner cylinder, and infrared rays joined to the end surface of the outer cylinder opposite to the end surface joined to the flange An infrared detector, comprising: a window that is a transparent material.