JPH02115725A - Optical sensor calibrating device - Google Patents

Abstract

PURPOSE:To irradiate on optical sensor with a uniform and large quantity of sunlight by condensing the sunlight by a lens having the lens effect in one direction. CONSTITUTION:A cylindrical lens 2 has the condensing effect in one direction and forms a sun image 4 so that this image is long in the direction perpendicular to the lengthwise direction of an arrow 3A of a line sensor 3. When the movement direction of the sun is the lengthwise direction of an arrow 4A of the sun image 4, the image forming position of the sun image 4 on the sensor 3 is not changed and the approximately fixed sun image 4 is projected. That is, it is sufficient if the lens 2 is long in the movement direction of the sun. Since the sunlight is long only in one direction, the quantity of light is scarcely attenuated. Since the sun light is formed the image with a long size, the brightness of the sun image 4 is uniform, and the density of the quantity of light made incident on the sensor 3 is fixed by movement of the sun.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an optical sensor calibration device.

[Conventional technology]

A conventional optical sensor calibration device has three means for irradiating sunlight from a light source onto an optical sensor as an object to be calibrated.

The first means collects sunlight in an integral manner and sends it to the sensor surface as diffused light.The second means guides sunlight to the optical sensor using an optical fiber and irradiates it with diffused light. Hand R
t LL ji7. After refocusing Lu1 on the sensor surface, it is j'l-,' at the T° stage, which images the large one on the sensor surface.

Invention or Problem to be Solved 1 The light sensor calibration device of the Song dynasty, which had two series of 5 units, was the first one.
Regarding the stage, after irradiating the thick 1 (W light) within the 11′1 sphere, the 11-ta scattered light is irradiated onto the light sensor→no surface, so that jj. 'll; hi has the disadvantage of always being attenuated.

In the second method, since the sunlight is guided into the optical fiber, the light is diffused within the optical fiber and emitted at a wide angle as scattered light, resulting in a low light density. Also, when the incident angle of sunlight is +1I: the distribution of the light emitted from the ``noaiha'' changes and becomes stable at 42 lights! +1. It also has the disadvantage of being difficult to obtain. The third stage 4.l. mirror reflects sunlight in the desired direction on the sensor surface.

In order to form an image of the Sun》, the surface on which the light hits {{I('J1) always becomes narrower, and the exact 3ji J of the large intestine
The disadvantage is that 4 is required.

[Means to solve the problem]

The optical sensor calibration device of the present invention is an optical sensor calibration device that uses sunlight, and has a semi-cylindrical shape that has a light condensing effect only for parallel rays in one plane direction among parallel rays of sunlight on surfaces perpendicular to each other. A lens is provided, and the sun ('It) is imaged by the semi-cylindrical lens in a direction perpendicular to the major axis direction of the optical sensor, which is the object to be calibrated.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention. The example of FIG. 1 is solar light 3, ,! 1' cylindrical lens 2 which is a cylindrical L/lens, a line sensor 3 as a calibration target,
As shown in Figure 0, which is a circular sun imaged on the line sensor 3, the silitorical lens 2 has a light-concentrating effect in the - direction, and is perpendicular to the length direction 3Δ of the line sensor 3. Tie Taiyo 1 Kasa 4 so that it contracts in the direction of 1.

In addition, in each case where the direction of movement of the sun is 4Δ in the longitudinal direction of the sun e and 11, the result of the sun image 1 on the line sensor 3 (the reconnaissance position does not move and the sun image 4 is mostly constant is reflected). In other words, it is sufficient to use a cylindrical lens 2 that is long in the sun's movement direction.Also, by lengthening the sunlight in only one direction, the scene will not be attenuated much, and since the sunlight can be imaged for a long time. The brightness of the sun and the interior of the line sensor 4 becomes uniform, and the density of the amount of light incident on the line sensor 3 becomes constant due to the movement of the sun.The present invention is simply an optical sensor that is calibrated by directly injecting sunlight onto the line/sensor. In addition to the above calibration device, the present invention can also be applied to devices such as light emitting devices and cameras having a vertically elongated light condensing function.

〔Effect of the invention〕

As explained above, the present invention makes it possible to uniformly irradiate a large amount of sunlight onto the line sensor with @easy tracking by concentrating sunlight using a lens that has a lens effect in one direction. effective.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the present invention. 1...Sunlight, 2...Silitrical lens, 3...
・Lie/sensor (calibration pair!9.!t!7J), 4...
・Solar image, 3A... Lie/Sensor length direction, 4A...
・Longitudinal direction of the sun. 3A la 4>t;

Claims (1)

[Claims] An optical sensor calibration device using sunlight, comprising a semi-cylindrical lens having a light condensing effect only for parallel rays in one plane among the parallel rays of the sunlight on planes perpendicular to each other; An optical sensor calibration device characterized in that a solar image is formed by the semi-cylindrical lens in a direction perpendicular to the major axis direction of a certain optical sensor.