JPH0648361Y2 - Infrared detector - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is an infrared ray detector equipped with an infrared ray detector equipped with an element for detecting infrared rays and generating a signal, and a cooler for cooling the element. The present invention relates to a detection device.

[Conventional technology]

FIG. 2 is a cross-sectional view showing a conventional infrared detecting device. In the figure, (1) is an infrared detecting element, and (2) is an infrared detecting having a double cylindrical structure in which the infrared detecting element (1) is mounted inside. (3) is a nozzle that constitutes a cooler that can cool to an extremely low temperature by utilizing the Joule-Thomson effect, and (4) is the above-mentioned cooler that has a heat exchange fin on the outside. Pipe, (5) is a heat insulating thread that constitutes the cooler, (6) is a columnar body that constitutes the cooler,
(7) is a second pipe constituting the cooler, and (8) is a jet flow blown from the nozzle (3).

The conventional infrared detecting device is constructed as described above and has the above-mentioned second structure.
The high pressure gas is supplied to the pipe (7) from a high pressure gas supply device (not shown), and the high pressure gas exchanges heat with the first pipe (4) wound around the cylindrical body (6). While flowing through the nozzle (3), the temperature of the high-pressure gas is lowered by the Joule-Thomson effect at this time, and becomes the jet flow (8), and the jet flow (8) is heated to the liquefaction temperature of the high-pressure gas with time. By cooling the infrared detecting element (1) mounted on the infrared detecting device (2) and sending the signal generated by the element detecting infrared rays to an external signal processing circuit (not shown). ， Can detect infrared rays. The heat insulating thread (5) is installed for the purpose of efficiently exchanging heat in the first pipe (4) when the high pressure gas that has become the jet stream (8) is discharged.

[Problems to be solved by the device]

The conventional infrared detecting device as described above has the following problems to be solved. That is, in the conventional infrared detection device, the jet stream (8) cooled to the liquefaction temperature of the gas blown out from the nozzle (3) of the cooler is located near the infrared detection element (1) of the infrared detector (2). Temperature change occurs at the part where the jet (8) collides due to the fact that the jet directly collides with the jet and the jet is a gas-liquid multiphase flow. The temperature change is transmitted to the infrared detection element (1) and the sensitivity changes. However, there is a problem that it is necessary to reduce the noise.

The present invention has been made in order to solve such a problem, and an object thereof is to obtain an infrared detecting device with low noise in which an infrared detecting element is cooled by a cooler utilizing the Joule-Thomson effect.

[Means for Solving the Problems]

In the infrared detector according to the present invention, the direction of the nozzle of the cooler is slanted so that two nozzles are provided and the direction of the jet flow blown out from the nozzle is diffused.

[Action]

In this device, the direction of the cooler nozzle is slanted,
Since there are two nozzles and the jet is diffused and the jet does not directly collide with the vicinity where the infrared detector is installed, temperature fluctuations caused by jet collision are less likely to be transmitted to the infrared detector, resulting in less sensitivity change. Becomes
Noise can be reduced.

〔Example〕

FIG. 1 is a sectional view showing an embodiment of the present invention, in which (1) is an infrared detecting element, (2) is an infrared detector, (4) is a first pipe, and (5) is a heat insulating thread. , (6) is a cylindrical body, (7) is a second pipe, (8) is a jet flow, and (3) is a nozzle installed at two diagonal positions.

In the infrared detecting device configured as described above, high pressure gas is supplied to the second pipe (7) from a high pressure gas supply device (not shown), and the high pressure gas is distributed around the columnar body (6). It flows through the wound first pipe (4) while exchanging heat, and passes through the nozzle (3). At this time, the temperature of the high-pressure gas is lowered by the Joule-Thomson effect, and becomes the jet flow (8). The temperature of the jet stream (8) decreases to the liquefaction temperature of the high-pressure gas with time, cools the infrared detection element (1) mounted on the infrared detection device (2), and a signal generated by the element detecting infrared rays is generated. Is sent to an external signal processing circuit (not shown), and infrared rays can be detected, which is exactly the same as the conventional device. The heat insulating thread (5) is provided with the first pipe (4) when the high pressure gas connected to the jet flow (8) is discharged.
It was installed in the same way as the conventional device for the purpose of efficient heat exchange.

However, in the infrared detection device according to the present invention, the nozzle (3) is inclined at two positions, and the jet (8) is provided.
The direction of can be diffused. Therefore, the jet flow (8) blown out from the nozzle (3) does not directly collide with the vicinity where the infrared detection element (1) is installed, and the temperature fluctuation caused by the jet collision is transmitted to the infrared detection element (1). As a result, sensitivity changes are less likely to occur and noise can be reduced.

[Effect of device]

As described above, according to this invention, the nozzle of the cooler is installed in two positions with the nozzle inclined, the direction of the jet flow is diffused, and the noise of the infrared element caused by the temperature fluctuation caused by the jet collision can be reduced. There is.

[Brief description of drawings]

FIG. 1 is a sectional view of an infrared detecting device showing an embodiment of the present invention, and FIG. 2 is a sectional view showing the infrared detecting device. In the figure, (1) is an infrared detecting element, (2) is an infrared detector, (3) is a nozzle, (4) is a first pipe, (5).
Is a heat insulating thread, (6) is a cylinder, (7) is a second pipe,
(8) is a jet flow. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. An infrared detector having an infrared detector having a double cylinder structure in which an infrared detection element is mounted, and a cooler utilizing the Joule-Thomson effect for cooling the infrared detection element to an extremely low temperature. In the infrared detecting apparatus, the nozzle for ejecting the jet at the tip of the cooler is installed in two places with the direction of the nozzle inclined, and the direction of the jet ejected from the nozzle is diffused.