JPH01269077A - Light wave warning device - Google Patents

Abstract

PURPOSE:To reduce the wrong information rate of the title device by discriminating presence/absence of a flying object radiating infrared rays from the presence/absence of signals of detecting elements which respectively detect infrared rays of 1mum, 3-5mum, and 8-14mum bands in accordance with a previously specified reference. CONSTITUTION:A multi-wavelength detector 7 provided with 1mum band detecting element 11 and 3-5mum band detecting element 14 and another multi-wavelength detector 8 provided with another 1mum band detecting element 11 and 8-14mum band detecting element 15 are provided to the title warning device. Output signals of the elements 11, 14, 11, and 15 are sent to a signal processing section after they are respectively amplified by amplifiers 17-20. The signal processing section discriminates whether the signals are produced by sunlight, deceptive flare, or infrared rays in accordance with the presence/absence of the signals and when it is discriminated that the signals are produced by infrared rays, issues a warning signal. In case the source of the signals is not certain, the section is caused not to issue the warning signal. Therefore, the wrong information rate of this device can be reduced.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a light wave warning device, and in particular uses energy in the infrared wavelength band emitted by a flying target as a signal to detect the presence or absence of a target and generate a warning. This invention relates to a light wave warning device.

(Prior art) Conventionally, this type of light wave alarm device is usually a light wave alarm device using a photodetector in the 1 μm band, a light wave alarm device using a photodetector in the 3 to 5 μm band, and a light wave alarm device using a photo detector in the 8 to 14 μm band. Each wavelength band had its own separate device, such as a light wave warning device using a detector.

(Problems to be Solved by the Invention) The conventional light wave alarm device described above is an independent device for each wavelength, so it can only detect targets in the wavelength band of the device used. There is a drawback that it is necessary to have all the light wave alarm devices for each wavelength, which makes the equipment unsuitable for use, and there are almost no cases where they can be used together.

Furthermore, since each wavelength band used for detection is a single wavelength band, there is no way to compare signals with other wavelength bands and process the results, so all detected signals are judged to be targets. However, there is a drawback in that it is not possible to issue an alarm with fewer false alarms by removing the influence of sunlight or artificial light due to deception.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a small and lightweight light wave alarm device that simultaneously detects infrared rays in three wavelength bands and significantly reduces the false alarm rate.

(Means for Solving the Problems) The present invention has the following means configuration to achieve the above object.

That is, the light wave alarm device of the present invention includes: 1 μm μm photometric detection for detecting infrared rays in the 1 μm wavelength band; 3-5 μm light detection and flat light detection for detecting infrared rays in the 3-5 μm wavelength band;
8-14 μm band light detection means for detecting infrared light in the 14 μm wavelength band; and a flying target that receives detection signals from each of the light detection means and emits infrared light according to predetermined criteria for the presence or absence of each detection signal. The present invention is characterized by comprising: a signal processing means for determining the presence or absence and generating an alarm when the presence or absence of the air conditioner is present; and;

(Function) Hereinafter, the function of the light wave alarm device of the present invention having the above means configuration will be explained.

Generally, a flying object emits infrared rays due to the following two types of heat generation.

One of these is that flying causes friction with the atmosphere, which causes structures such as the fuselage to generate heat (so-called aerodynamic heat), and the infrared rays from the flying object due to this heat generally radiate mostly in the 8 to 14 μm band. It is true.

When the temperature of a flying object becomes higher than that of the surrounding atmosphere, the infrared rays emitted by the flying object become stronger than the infrared rays emitted by the surrounding atmosphere, which is used for detection signals. However, the amount of radiation is small, and flying objects generally emit exhaust gas, and the exhaust gas is high temperature and has a lot of infrared rays in the 3 to 5 μm band, and the exhaust port is high temperature. There are many infrared rays emitted from these in the 8 to 14 μm band, and these infrared rays are used for detection signals.

On the other hand, sunlight radiates in a wide range of wavelengths from visible light to infrared light, and has a sufficient amount of radiation up to the 5 μm band.

On the other hand, deceptive devices such as flares emit light in a wide range of wavelengths, from visible light to infrared light, and have an amount of radiation that can be detected up to the 5 μm band.

In summary, when a target projectile is flying and ejecting exhaust gas, the infrared rays in the 8-14 μm band and the 3-3 μm
It emits infrared rays in the 5 μm band, and only emits infrared rays in the 8 to 14 μm band when the gas injection is stopped and it is flying due to inertia. On the other hand, sunlight, flares, etc. emit infrared rays in the 3-5 μm band and infrared rays in the 1 μm band.

Therefore, when infrared rays in the 8 to 14 μm band are detected, it can be determined that a target flying object exists regardless of whether or not other wavelength bands are detected. However, since the amount of radiation of infrared rays in the 8 to 14 μm band is small, it may be difficult for distant flying objects to reach the infrared rays, in which case only infrared rays in the 3 to 5 μm band will reach them. However, infrared rays in the 3-5 μm band are also emitted from sunlight and flares, so
It is not possible to determine the presence of a flying object only by detecting infrared rays in the ~5 μm band; however, sunlight, flares, etc. simultaneously emit infrared rays in the 1 μm band, which flying objects do not emit. Therefore, when only infrared rays in the 3-5 μm band are detected, it can be determined that a flying object exists, but if infrared rays in the 1 μm band are also detected at the same time, it is certain that sunlight or flares have been captured, but there is no flying object. There is uncertainty about the capture of

The alarm device of the present invention has a 1 μm light detection means, a 3 to 5 μm light detection means, and an 8 to 14 μm light detection means, and can simultaneously detect infrared rays in each wavelength band. The detection signal output from each detection means is applied to the signal processing means. The signal processing means can perform 8 to 8 with or without other detection signals.
In all cases where there was a detection output of 14 μm light and in 8 to 1
If there is no detection output for 4μm light and only 3 to 5μm light is detected, an alarm indicating the presence of a target projectile is generated.On the other hand, if there is no detection output for 8 to 14μm light, , when both 3-5 μm light and 1 μm light are detected, when only 1 μm light is detected, and when both are not detected, processing is performed so as not to generate an alarm.

In each of the above cases, there was no detection of 8-14 μm light, and 1 μm light was not detected.
If both light and 3-5μm light are detected, it is certain that sunlight or flares are being captured, but it is uncertain whether the target is also being captured, so an alarm will be generated. We are taking steps to prevent this from happening. In other cases, a warning is issued when a flying object is captured, and an alarm is not issued when it is not a flying object, so the false alarm rate is low.

As explained above, the light wave alarm device of the present invention includes 1 μm μm light analysis detection, 3 to 5 μm band light detection, flat light detection to 14 μm band light detection, hand strap detection, and detection signals from each detection means. Conventionally, a separate alarm device was used for each wavelength band, and in order to reliably determine the presence or absence of a flying object, Compared to the case where these three alarm devices were prepared and the operator had to make a judgment based on their alarm conditions, the light wave alarm device is smaller and lighter and has a very low false alarm rate.

(Example) Hereinafter, an example of the light wave warning device of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a block diagram showing in detail the sensor section 1 of FIG. 1, which is the most important part of the present invention, and FIG. FIG. 4 is a configuration diagram showing an example of a multi-wavelength detector. FIG. 4 is a side view of an example in which a plurality of light wave alarm devices of the present invention are mounted in a dome 23 in different directions. Dome 23 is attached to carrier 24.

The configuration of an embodiment of the present invention shown in FIG. 1 includes a sensor section 1, a signal processing section 2, and a power supply section 3.

First, the sensor section 1 having the most important function of the present invention will be explained with reference to FIG. The sensor section 1 has multi-wavelength detectors 7 and 8. The multi-wavelength detector 7 is enclosed in a container including a 1 μm μm photodetecting element 113 to a 5 μm band photodetecting element 14, and is cooled to a required temperature by a cooler 16.

Further, a filter 12 is used to separate energy in the 1 μm band and energy in the 3 to 5 μm band.

On the other hand, in the other multi-wavelength detector 8, a 1 .mu.m .mu.m photometric detection element 11 to 14 .mu.m band photodetection element 15 are sealed in the same container and cooled to a required temperature by a cooler 16'. A filter 13 is used to separate energy in the 1 μm band and energy in the 8 to 14 μm band.

The window 4 guides light energy to the light wave alarm device and passes energy in the required wavelength band of 1 μm to 14 μm.The light energy that passes through the window 4 is focused by condensing lenses 5 and 6 and sent to a photodetector element. The optical parameters of the condensing lenses 5 and 6 are determined so that the light energy in the wavelength band required by the photodetecting element in each wavelength band is condensed.

Windows 9 and 10 are windows for enclosing optical energy into each photodetecting element enclosed in the case of multi-wavelength detectors 7 and 8. The output signal from each photodetector element is amplified by amplifiers 17 and 18 and amplifiers 19 and 20, and sent to the signal processing section 2 as an output of each wavelength band.

The signal processing unit 2 receives the signal output thus sent out, generates an alarm output to notify the presence of the target, and supplies this to a display and other systems.

The signal processing section 2 has its operation controlled by a control signal received from the system controller (not shown) together with the sensor section 1, and receives power supply from the power supply section 3 while performing the above-mentioned (
Execute the signal processing described in the section (Operation).

The multi-wavelength detectors 7 and 8 used in the sensor section 1 are as shown in FIG. 3, where a is window 9 or window 10, and b is
C is the filter 12 or filter 13, and d is the 3-5 μm band photodetecting element 1414 μm band photodetecting element 15. 22 is a vacuum container constituting the multi-wavelength detector 7 or 8;
21 is a refrigerant for the cooler 16 or 16'.

FIG. 4 is a side view of one dome 23 in which nine light wave alarm devices of the present invention are mounted in different directions.
By arranging nine windows 4 of the light wave warning device of the present invention on a hemisphere like this, it is possible to issue an alarm signal in every 60” direction of the hemisphere. It is attached to the body 24 and operated.

(Effects of the Invention) As explained above, the light wave alarm device of the present invention includes 1 μm μm light analysis detection, 3 to 5 μm light band detection, flat light detection to 14 μm light band detection, hand band detection, and further each detection. Conventionally, a signal processing means is provided to receive detection signals from the means and compare them to determine the presence or absence of a target flying object. In contrast, the presence or absence of a flying object had to be determined from
It has the advantage of being small and lightweight and capable of issuing a flying object warning with a very low false alarm rate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the light wave alarm device of the present invention, FIG. 2 is a diagram showing the configuration of the sensor section, FIG. 3 is a structural diagram of a multi-wavelength detector, and FIG. The figure is a side view of nine light wave alarm devices of the present invention mounted in a dome in different directions. 1...Sensor section, 2...Signal processing section, 3...Power supply section, 4...Window, 5.
6...Condensing lens, 7.8...Multi-wavelength detector, 9,10...Window, 11...
...1 μm μm light analysis detection element 12゜13...Filter, 14...3 to 5 μm band light detection element Photodetection element...8 to 14 μm band light detection element, 16 ．．
16'...Kura, 17~20...
Amplifier, 21... Refrigerant, 22...
Vacuum container, 23...Dome, 24...
・Transporter. Agent Patent Attorney Yoshihiro Hachiman

Claims (1)

[Claims] 1 μm band light detection means for detecting infrared light in a 1 μm wavelength band; 3 to 5 μm light detection means for detecting infrared light in a 3 to 5 μm wavelength band; 8 to detect infrared light in an 8 to 14 μm wavelength band.
~14 μm band light detection means; upon receiving the detection signals from each of the light detection means, it is determined whether or not there is a flying target that emits infrared rays according to predetermined criteria based on the presence or absence of each detection signal, and if there is, an alarm is issued. 1. A light wave alarm device comprising a signal processing means for generating a signal.