JPH0547052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an infrared measuring device for measuring the amount of infrared radiation of a measurement object, and particularly to an infrared measuring device mounted on an aircraft.

[Conventional technology]

Figure 3 shows, for example, "Single or dual pod"
concepts for tactical reconnaissance” (SPIE,
561, P52, 1985). In the figure, 1 is an infrared transmitting window, 2
is an infrared detection device that detects infrared rays transmitted through the infrared transmission window 1; 3 is an electronic circuit that processes electrical signals from the infrared detection device 2; and 4 is a casing that holds the infrared transmission window 1, which is mounted on an aircraft. There is.

Next, the operation will be explained. Infrared rays emitted from an object to be measured are transmitted through an infrared transmission window 1, detected by an infrared detection device 2, and converted into an electrical signal.
By converting this electrical signal into the amount of infrared radiation emitted by the electronic circuit 3, the amount of infrared radiation emitted from the object to be measured is measured.

[Problem that the invention seeks to solve]

Conventional infrared measurement devices are configured as described above, so when installed on a high-speed flying aircraft, the infrared rays generated when the infrared transmission window is heated by air friction, the infrared rays generated from the optical components inside the infrared measurement device, Unnecessary infrared rays such as infrared rays generated from the housing, etc., reflected by optical components, etc. and reaching the infrared detection device are detected together with the infrared rays emitted from the measurement target by the infrared detection device, so unnecessary infrared rays are detected. There was a problem in that it was not possible to separate the amount of infrared radiation emitted from the object to be measured.

Furthermore, since the amount of unnecessary infrared radiation varies greatly depending on the flight speed of the aircraft, the outside temperature, and the temperature inside the infrared measuring device, it is problematic to predict the amount of radiation in advance and correct the amount of radiation.

This invention was made in order to solve the above-mentioned problems, and aims to provide an infrared measuring device that can correct the amount of unnecessary infrared radiation generated from inside the infrared measuring device such as an infrared transmitting window. purpose.

[Means for solving problems]

In the infrared measuring device according to the present invention, an infrared transmitting window is attached to a rotating pedestal rotated by a rotating device so as to be freely rotatable, and an infrared reference light source is provided in a casing that holds the rotating pedestal, and the rotating pedestal is rotated. By doing so, the infrared rays from the infrared reference light source are transmitted through the infrared transmitting window and detected by the infrared detecting device, and a correction means is provided for correcting the infrared rays generated from the measuring device.

[Effect]

The infrared measuring device according to the present invention rotates the rotating base at any time during the flight of the aircraft, and transmits the infrared rays from the infrared reference light source through the infrared transmitting window and detecting them with the infrared detecting device. The correction circuit corrects unnecessary infrared rays generated by the object to improve the accuracy of measuring the amount of infrared radiation emitted from the object to be measured.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is an infrared transmission window, 2 is an infrared detection device that detects infrared rays that pass through the infrared transmission window 1, 3 is an electronic circuit that processes electrical signals from the infrared detection device, and 5 is a rotation of the infrared transmission window 1. It is a rotary stand that can be held freely, and is held by a housing 4. 6
7 is an infrared reference light source attached to the housing 4;
This is a rotating device that rotates the rotating mount 5 in order to transmit the infrared light and detect it with the infrared detection device 2.

Next, the operation will be explained.

When measuring the amount of infrared radiation emitted from an object to be measured, the infrared rays detected by the infrared detection device 2 include the infrared rays emitted from the object to be measured that have passed through the infrared transmitting window 1, and the infrared rays emitted from the infrared transmitting window 1. This is the sum of the infrared rays generated from inside the measuring device.
This sum of infrared rays is converted into an electrical signal by the infrared detection device 2 and stored in the electronic circuit 3 as a first signal.

The line of sight direction of the infrared transmission window 1 and the infrared detection device 2 is rotated by the rotation device 5, and the infrared reference light source 6 is rotated.
When the infrared rays are directed at becomes. This sum of infrared rays is converted into an electric signal by the infrared detection device 2, and sent to the electronic circuit 3 as a second signal.
is memorized. The electronic circuit 3 connects the first signal and the second signal.
By taking the difference between the signals of the infrared transmitting window 1
The signal components corresponding to the amount of infrared radiation generated from inside the infrared measuring device are canceled out, and the signal component corresponding to the difference in the amount of infrared radiation between the object to be measured and the infrared reference light source 6 is determined. This signal component can be converted into a difference in the amount of infrared radiation between the object to be measured and the infrared reference light source 6 using the electronic circuit 3, and the amount of infrared radiation of the infrared reference light source 6 can be determined from the temperature of the infrared reference light source 6. By calculating the sum of this and the difference in the amount of infrared radiation determined previously, the amount of infrared radiation emitted from the object to be measured can be identified.

In the above embodiment, the infrared detecting device 2 was rotated together with the infrared transmitting window 1 by the rotating device 7, but as shown in FIG. The line of sight direction of the infrared detector 2 may be rotated together with the infrared transmitting window 1 by a rotating device 7.

〔Effect of the invention〕

As described above, according to the present invention, by using a rotating device, infrared rays from an infrared reference light source can be transmitted through an infrared transmitting window and detected, so that air friction, which can be a problem when mounted on an aircraft, can be avoided. This has the effect of correcting the amount of unnecessary infrared radiation generated from inside the infrared measurement device, such as infrared radiation generated from the infrared transmission window.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an infrared measuring device according to one embodiment of the present invention, FIG. 2 is a diagram showing an infrared measuring device according to another embodiment of the present invention, and FIG. 3 is a diagram showing a conventional infrared measuring device. be. 1 is an infrared transmitting window, 2 is an infrared detection device, 3 is an electronic circuit (correction means), 4 is a housing, 5 is a rotating mount,
6 is an infrared reference light source, and 7 is a rotating device. Also, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In an infrared measuring device equipped with an infrared transmitting window and an infrared detecting device that detects infrared rays transmitted through the infrared transmitting window, there is provided a rotating pedestal that rotatably holds the infrared transmitting window, and a casing that holds the rotating pedestal. an infrared reference light source provided in the casing, a rotation device that rotates the rotating frame to a position where the infrared transmission window transmits infrared rays from the infrared reference light source, and an infrared reference light source provided in the infrared reference light source. An infrared measuring device comprising: a correction means for correcting the amount of infrared radiation emitted from the infrared measuring device by detecting the infrared rays with the infrared detecting device.