JPH07294328A - Photometry device - Google Patents

Abstract

PURPOSE:To provide a multiple light detection/distribution measuring device wherein the operation of a light source and a light detector is suppressed to minimum by miniaturizing the light detecting device and making measurement space smaller. CONSTITUTION:Luminance meters 31 are provided in an optical box 8, and multiple luminance meters are assigned radiately so that the optical axes of luminance meters cross each other at a light-detecting aperture 9, and the light distribution of a light source 1 is measured through mirror surfaces 7-1 to 7-3 corresponding to individual luminance meters.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photometric device for measuring the light distribution of a light source.

[0002]

2. Description of the Related Art Conventionally, a method of mechanically moving a light source, a light receiver and a mirror has been widely used for light distribution measurement of a light source. However, it has drawbacks such as long measurement time and high manufacturing cost of the device. In order to improve this, as shown in FIG. 5, a large number of light receivers 20 are arranged around the vertical direction of the light source 1, and the light source 1 is horizontally rotated to measure light emitted from the light source in all directions. The device has appeared.

[0003]

However, in the above-mentioned conventional configuration, the distance between each light receiver installed around the light source and the light source must be about 5 m in consideration of the size of the light source, and the measurement space However, there were many problems, such as the fact that it was greatly expanded, and that it was difficult to maintain and maintain the upper light receiver.

The present invention solves the above problems, and an object of the present invention is to provide a photometric device that changes the alignment of conventional multi-receivers, compresses the measurement space, and facilitates the maintenance and maintenance of each photoreceiver. To do.

[0005]

To achieve the above object, according to the present invention, a group of luminance meters is installed radially, and the light distribution of a light source is measured through a mirror surface corresponding to each luminance meter on a one-to-one basis. It is a composition.

[0006]

As a result, the light distribution of the light source can be measured more accurately in a comparatively small measuring space, instead of the conventional method which requires a large measuring space.

[0007]

EXAMPLES Examples of the present invention will be described below.
FIG. 1 is a diagram showing a photometric device in a first embodiment of the present invention, and FIG. 2 is a diagram showing a schematic sectional structure of one luminance meter in the present embodiment.

First, in FIG. 2, 1 is a light source, 2 is a lens system, 3 is a light-shielding cylinder, and the light-shielding cylinder 3 has a lens system 2, an aperture 4, and a filter 5 for inverse correction of image plane luminance distribution. ,
It is composed of a light receiver 6, and an image of the light source 1 is formed on the aperture 4. Filter 5 for inverse correction of the above image plane luminance distribution
When the luminance of the light source deviates from the optical axis, the luminance decreases from the actual due to the influence of the cosine fourth law, etc. Therefore, when it becomes necessary to correct this, it is inserted to lower the central luminance from the peripheral. .

Next, as shown in FIG. 1, in the photometric device of this embodiment, a plurality of luminance meters shown in FIG. 2 are radially arranged by sharing one point P of each optical axis, and an optical system is provided. It has a configuration of being housed in the housing 8. The optical system housing 8 has a light receiving window 9 in which the optical axis common point P of the luminance meter group 31 is located.

In addition, each luminance meter individually adjusts the angle of the mirror surface so that the image of the entire light source enters into each aperture through one mirror surface 7 (7-1 --- 7-n). To do. At this time, a mirror surface corresponding to each luminance meter one-to-one is installed at each point on the ellipsoidal surface with the light source 1 and the intersection of the optical axes of the luminance meter group 31 as the focal point, aligned with the tangential direction of the ellipsoidal surface. Then, the distances to the light source 1 of all the luminance meters are almost constant, the alignment of the luminance meters is easy, and the output is at the same level with respect to the perfect diffused light source, and an advantageous condition in the design of the device can be obtained. With such a configuration, when the light source 1 is rotated in the horizontal direction as shown in FIG. 1 and the output of the luminance meter group 31 is measured, the light distribution characteristics of the entire light source 1 are obtained.

In FIG. 2, the lens system is inserted in the light-shielding cylinder 3, but a distributed index lens is used in place of the light-shielding cylinder 3 and the lens system 2, and an aperture 4 is formed on the end face of this lens.
By connecting the filter 5 for inverse correction of the image plane luminance distribution and the light receiver 6, the luminance meter can be made slim and a large number of luminance meters can be arranged in the optical system housing 8. The resolution can be increased. In this case, the length of the distributed index lens may be determined so that the image from the light source is formed on the end surface of the lens.

As described above, in the conventional multi-receiver system, the measurement space requires a height of 5 m above and below the light source, a total of 10 m, which is equivalent to 3 floors of a normal building. However, according to the present embodiment, it is compressed to about 6 m (corresponding to a building on the second floor), and above all, adjustment, maintenance and management of the light receiver are important. It can be done easily.

Next, a second embodiment of the present invention will be described. In FIG. 1, the light output directly below the light source is almost unmeasurable due to the structure. In order to solve this, as shown in FIG. 3, the optical system housing 8 is configured to rotate around the optical axis sharing point P of the luminance meter group and is shifted to the position 81. This allows the light distribution directly below to be measured. Furthermore, the addition of this rotation function brings about the merit that the outputs of the luminance meters can be compared.
Furthermore, by sliding the optical system housing 8 horizontally from the position 81 to the position 82, it becomes possible to measure the light distribution in a portion close to directly above the light source, which could not be measured at the position 81. The rotating structure may be of any structure as long as it is rotatable, and the sliding mechanism may be of any structure as long as it is slidable.

The third embodiment of the present invention will be described below with reference to the drawings. In FIG. 4, a plurality of optical fibers 10 are installed in place of the respective light receiving parts of the luminance meter in the first and second embodiments, and the light output ends of these optical fibers are guided to a disk 11 arranged in a circle. It is a figure which shows the Example of 3.

These optical outputs are time-divisionally guided to the high-speed spectroscopic measurement device 13 by the rotary rotor 12 with an optical fiber, and after high-speed spectroscopic analysis, spectroscopic measurement data for each light distribution is obtained through the measurement processing unit 14. As a result, the metal iodide adheres to the lower part of the arc tube during lighting, and the light emission phenomenon of a metal halide lamp or the like, in which the difference in the spectral distribution between the vertical light distribution and the horizontal light distribution is noticeable, can be easily measured. become able to.

In this case, it goes without saying that the rotation of the rotary rotor 12 and the scanning of the linear image sensor of the high speed spectroscopic measurement device 13 are controlled in synchronization with each other.

[0017]

As described above, according to the present invention, the measurement space can be remarkably reduced as compared with the conventional multi-receiver method, while maintaining the same time for the high-speed light distribution measurement as the conventional one, and Easy adjustment, maintenance and management of vessels.

[Brief description of drawings]

FIG. 1 is a diagram showing a photometric device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a structure of a luminance meter in the first embodiment of the present invention.

FIG. 3 is a diagram showing a photometric device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a photometric device in a third embodiment of the present invention.

FIG. 5 is a diagram showing a schematic configuration of a conventional photometric device.

[Explanation of symbols]

 1 light source 7 mirror surface 8 optical system housing 9 light receiving window 31 luminance meter group

Claims (4)

[Claims] 1. A brightness meter group radially arranged so that the optical axes of a plurality of brightness meters intersect at one point, and is configured to measure the light distribution of a light source through a mirror surface corresponding to each brightness meter. Photometric device. 2. The photometric device according to claim 1, further comprising a mechanism for rotating the luminance meter group around a point where the optical axes of the luminance meter group intersect. 3. The photometric device according to claim 1, wherein the mirror surface corresponding to each luminance meter one by one is installed on an ellipsoidal surface whose focal point is the intersection of the optical axis of the luminance meter group. 4. A plurality of mirror surfaces arranged so that the optical axes of a plurality of incident lights distributed from a light source intersect at one point, and radially so that the incident light from the mirror surfaces is received by a light input end. A plurality of optical fibers provided, a disk in which the optical output ends of these optical fibers are provided in a circular shape, a rotating rotor that takes in the optical output from the optical output end in a time division manner, and the light is emitted from this rotating rotor. A photometric device that includes a spectroscope that disperses light at high speed, and a measurement processing unit that performs measurement processing on the output of the spectroscope.