JPH07139898A - Infrared target generator - Google Patents

Abstract

PURPOSE:To simplify an apparatus and to improve accuracy by generating a target signal by using a laser oscillator in an infrared target generator to be used for evaluation of an infrared guided missile, etc. CONSTITUTION:A laser light 6 is emitted from a laser oscillator 2, reflected by a target generator 3, and emitted to a detector 9 as a target signal 7. The generator 3 has a disk 3a and a driver 4 having a sliding mechanism (not shown) for rotating or linearly moving the disk 3a. A plurality of reflecting surfaces having different annular reflectivities are provided on a reflecting surface of the disk 3a. A controller 5 controls the driver 4 to set the reflectivity of the signal 7 to a target value, and hence can delicately controls the reflectivity and cope with an element under test for a plurality of wavelength bands.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared target generator used for evaluation of infrared guided vehicles and the like.

[0002]

2. Description of the Related Art Conventionally, infrared target generators are roughly classified into a point target system and an image target system. As the technique according to the present invention, the former point target system corresponds to this, and the main target signal source as the conventional technique of this system is a black body furnace, and the energy adjustment in this case is performed by the temperature of the black body furnace or the black body furnace. It is carried out by changing the diameter of the aperture at the opening of infrared rays emitted from the body furnace.

FIG. 7 shows the configuration of a conventional infrared target generator. The black body furnace 11 is heated to a preset temperature to generate infrared rays 20. Infrared 20 generated is aperture 1
The rotary shutter 13 adjusts the level of the signal through the opening diameter of 2 and turns it on and off. After that, the light ray 20 is reflected by the plane mirror # 1 of 14 and is reflected by the plane mirror # 2 of 15, and in the plane mirror 15, the vertical optical axis adjusting unit 1 is formed.
5a and the focus slide adjusting unit 15b are adjusted to irradiate the primary plane mirror 16. Here, parallel light rays 18 are output from the infrared emission port 17 as an infrared signal serving as a target signal toward a target point outside the apparatus.

[0004]

The conventional device described above has the following problems.

(1) It is difficult to change the target signal level in real time. That is, in order to change the signal level, the infrared energy generated by changing the temperature of the black body furnace 11 is adjusted, but the time required to stabilize at the set temperature is several minutes to several tens of minutes, which is a considerable time. . Further, the infrared energy can be adjusted by changing the diameter of the aperture 12 to change the level, but it is necessary to equip the aperture 12 with a diaphragm mechanism of the camera, which is expensive.

(2) The shutdown time is long. That is,
Since the blackbody furnace 11 is used, it takes about 1
It takes time.

(3) The operating environment is limited. That is, since the black body furnace 11 is used, its use under an excessive shock and vibration environment is restricted.

The present invention has been made in order to solve such a problem, and provides an infrared target generator which can easily obtain a target light beam by changing the reflectance and the ratio of the reflecting surface using a laser beam. It is a thing.

[0009]

In order to solve the above-mentioned problems, the present invention uses a laser oscillator for obtaining a light beam of a target signal, and reflects the laser light on a rotating disk rotated by a rotating means. . The reflecting surface of the rotating disc is provided with an annular reflecting surface having a different reflectance, and the control device controls the reflecting surface by changing the reflecting surface by sliding the rotating disc with the slide means. This is a device for adjusting the level, and since the change in reflection can be subdivided smoothly, a fine reflectance can be set, and a versatile target generator is provided.

That is, the present invention has a laser oscillator and a plurality of reflecting surfaces which are annularly arranged at the center of rotation and have different reflectances. The laser light from the laser oscillator is reflected in a predetermined direction to achieve a target. A rotating disc that emits a signal, a rotating unit that rotates the rotating disc, a sliding unit that moves the rotating disc in a predetermined linear direction, a rotating unit that rotates the rotating disc, and the sliding unit. An infrared target generation device comprising: a control device that controls and adjusts the level of the target signal.

[0011]

In the target generator of the present invention, the specific reflecting surfaces having different reflectances are arranged at a predetermined ratio in the rotating direction of the rotating disk, and when one rotation is integrated, the composition according to the arrangement ratio (apparent The reflectance (above) can be obtained. It is possible to simulate an arbitrary reflectance by sliding the rotating disk by the sliding means and changing the reflecting surface or the arrangement ratio while keeping the reflecting direction of the target signal as it is. Therefore, by controlling the sliding amount of the rotating disk by the control device and arranging a large number of reflecting surface combinations on the same rotating disk in the radial direction, it is possible to generate a continuous target signal and further change the level of the target signal. It becomes feasible.

Further, since the laser irradiation time to the same point is shortened by rotating the rotary disc, it is possible to reduce the generation of infrared afterimage due to heating by the laser light.

Further, when the apparatus is stopped, it is sufficient to stop the laser oscillator, so that the shutdown can be performed in a shorter time than the conventional case.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the drawings. FIG. 1 is a block diagram showing the configuration of an infrared target generator according to an embodiment of the present invention. In FIG. 1, 1 is the whole target generator, 2 is a laser oscillator (CO ₂ laser) used as an infrared light source, and 10.6 μ
The laser light 6 of m is generated, and the target generator 3 is irradiated with the laser light 6.
The laser beam 6 (in this embodiment, a sample having a detection capability of 10 μm band) is reflected by the target generator 3 and is sent to the detector (sample) 9 as a target signal 7. 8 is a test piece as a whole consisting of a detector 9 and a controller 10, and the controller 10 is a test piece (eg, a flying object, etc.)
The target signal detected by the detector 9 is input and measured, and it has a function of analyzing and evaluating the detected signal.

A drive unit 4 rotationally drives the target generator 3, and slides the target generator 3 as shown in FIG. As a method of sliding, two kinds of sliding are possible without changing the reflection angle θ of the laser light 6; R1 in the same direction as the radial direction of the disc 3a and R2 in the vertical direction.

Reference numeral 5 denotes a control device for controlling the start and stop of the rotational drive of the drive unit 4, the rotational speed, the timing of the slide, the pitch, etc., based on commands from an input device (not shown).

Although not shown in detail, the drive unit 4 is also provided with a control circuit, a rotation drive motor and a speed reducer, and a mechanism for sliding the disc 3a.
The rails are provided in the directions R1 and R2 shown in FIG. 1, and the disk is provided with a groove that slides on the rails to move. Any known means may be applied.

The reflecting surface pattern of the target generator 3 is shown in FIG. 2, where the reflecting surfaces A and B are 10.6 μm.
The laser light of m has different reflectances (in this text, the reflectances have a broad meaning in consideration of the incident angle of the laser light). In this case, the reflectance of each of the reflecting surfaces A and B is a
(0 ≦ a ≦ 1), b (0 ≦ b ≦ 1), and the proportion of each of the reflecting surfaces A and B on the same circumference is Sa, Sb (Sa + Sb =
1), the reflectance of the target generator 3 is 0 ≦
(A × Sa + b × Sb) ≦ 1. (Target generator 3
Is n rotations within the detection cycle time of the specimen (1 ≤ n; n
Is an integer). ) From the above, the target generator 3
The level of the target signal 7 can be easily changed without changing the laser oscillator by changing the reflection surface and the ratio occupied on the circumference.

FIG. 4 shows an embodiment in which the target signal 7 is controlled in real time. The reflecting surfaces A and B are set and arranged at different ratios from the center of the disk 3a toward the outside. In this case, the drive unit 4 of the target generator 3 slides to rotate the target generator 3 and change the reflection pattern, and controls the target signal 7 in real time. By finely setting the ratio of the reflecting surfaces A and B from the center of the disc 3a toward the outside, the control of the target signal 7 can be made smoother.

FIG. 5 is an explanatory view of the slide of the disc 3 described above, and FIG. 5 (a) shows that the slide amount is "0" and the disc 2a is 2 from the outside.
The laser beam 6 can be reflected by the pattern P ₁ of the circumference, and if it is moved by L ₁ as shown in (b), it is reflected by the pattern P ₃ of the third circumference from the outside of the disk 3a, and further ( c) It shows that if the disk 3a is moved by L ₂ as shown in the figure, it is reflected from the outside in the pattern of P _{4 on} the fourth round.

FIG. 6 shows a reflection surface pattern (example) for controlling the target signal 7 by a combination of the reflection surface coating colors of the disk 3a. WH (white), BL (blue), YE from the center.
In this example, the reflectance is changed for each color (yellow), RE (red), and BR (black).

The operation of the embodiment having such a configuration will be described together with reference to FIG. First, the laser beam 6 is emitted from the laser oscillator 2, and the laser beam 6 is reflected by the disc 3 a of the target generator 3 at the reflection angle θ to become the target signal 7 and reaches the detector 9. Data for setting the level of the laser light signal is input to the control device 5 from an input device (not shown), and initialization is performed to drive the drive unit 4. The drive unit 4 rotates the disk 3a of the target generator 3 based on the set conditions, and applies the disk 3a to the slide mechanism based on the set amount of slide to slide the disk 3a to obtain the reflectance and the reflection area. Set to the value of.

As described above, since the reflectance of the laser beam changes depending on the color / material / surface roughness of the reflecting surface of the disc 3a of the target generator 3, the specific reflecting surface having different reflectance is rotated. Arranging at a certain ratio in the direction and taking the integral of one rotation,
A composite (apparent) reflectance according to the arrangement ratio is obtained. In this way, by changing the reflecting surface or the arrangement ratio, an arbitrary reflectance can be simulated, so that the same reflecting disk 3a
By arranging a large number of reflecting surface combinations in the radial direction, the level change of the target signal 7 can be continuously performed. Further, by rotating the reflective disc 3a, the laser irradiation time at the same point is reduced, and the generation of infrared afterimage due to heating by the laser light 6 can be reduced.

[0024]

As described above in detail, in the present invention, since the composite reflectance is set by the reflection surface and the arrangement ratio of the reflection surfaces, theoretically unlimited reflectance (1 ≧ reflectance ≧ 0). Can be set. Further, by changing the laser oscillator (changing the wavelength of the laser beam) and changing the reflecting surface of the rotating disk according to the wavelength, it becomes a versatile device that can be used for specimens in a plurality of wavelength bands.

Further, the time for shutting down (shutdown) the apparatus is only required to stop the laser oscillator, so that it can be shortened to a few minutes.

Further, the laser oscillator and the target generator can be separately installed, and the driving part is only the rotating and sliding mechanism, so that the environment resistance is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an infrared target generator according to an embodiment of the present invention.

FIG. 2 is a layout diagram of reflection patterns of a target generator according to an embodiment of the present invention.

FIG. 3 is an operation explanatory view of the disc slide mechanism in the embodiment of FIG.

FIG. 4 is a layout view showing an application example of a reflection pattern of a target generation device in an embodiment of the present invention.

FIG. 5 is a diagram for explaining the change of the reflection pattern according to the embodiment of the present invention, where (a) is the case where the movement distance is “0”, and (b) is
Shows the case of L ₁ and (c) shows the case of L ₂ .

FIG. 6 is an explanatory diagram showing an example in which the reflection pattern of the target generation device of the present invention is performed in color.

FIG. 7 is a block diagram of a conventional infrared target generator.

[Explanation of symbols]

 1 Target Generation Device 2 Laser Oscillator 3 Target Generation Device 4 Drive Unit 5 Control Device 6 Laser Light 7 Target Signal 8 Whole Specimen 9 Detector 10 Controller

Claims (1)

[Claims] 1. A laser oscillator, which has a plurality of reflecting surfaces arranged in an annular shape at the center of rotation and having different reflectances, and which reflects a laser beam from the same laser oscillator in a predetermined direction to generate a target signal. A disk, a rotating means for rotating the rotating disk, a sliding means for moving the rotating disk in a predetermined linear direction, a rotating means for the rotating disk, and the sliding means for controlling the rotating means. An infrared target generator, comprising: a controller for adjusting the level of a target signal.