JPH05302853A - Integrating sphere apparatus - Google Patents

Abstract

PURPOSE:To reduce the opening area of an incident window, to reduce the opening ratio of an integrating sphere and to make it possible to measure the diffused reflection only based on the diffused reflection component by providing the constitution wherein luminous fluxes are cast into two reflection measuring windows at an incident angle 0 and a specified incident angle. CONSTITUTION:A main body 1 of an integrating sphere has two reflection measuring windows, wherein a sample 2 whose reflection is measured or a standard sample 2 is arranged. Incident windows A and B, through which measuring luminous flux or reference luminous flux is cast, are provided in correspondence with the reflection measuring windows. The window A is set so that the incident luminous flux 3 is cast on the sample at the specified incident angle and the reflected luminous flux 4 does not return to the incident window again. The incident window at the side A has the opening area of the size, which can sufficiently pass only the incident luminous flux, because the luminous flux 3 has the specified incident angle and the entire reflected luminous flux from the corresponding sample is supplemented with the inner wall of the integrating sphere. Namely aXb (a<a' and b<b'). Therefore, the area of the outer shaded part is increased, and the opening ratio is reduced by that amount.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrating sphere device as an accessory device of a spectrophotometer, and more particularly to diffuse reflection, specular reflection,
The present invention relates to an integrating sphere device suitable for a wide range of measurements such as scattered transmitted light, turbidity, haze, and color.

[0002]

2. Description of the Related Art In a conventional integrating sphere apparatus, as shown in FIG. 2, two luminous fluxes incident on an integrating sphere 1 toward two reflection measurement windows (standard samples or measurement samples 2 and 2). The angle was 0 ° (perpendicular to the reflection measurement window), and the size (cross-sectional area) of both entrance windows was the same and was relatively large. That is, when the diffuse reflection measurement of the sample is performed, it is desirable to let all specular reflection components of the sample escape from the integrating window to the outside of the integrating sphere 1 and measure only the diffuse reflection component. However, normally, the light flux passing through the integrating sphere is close to parallel light, but is not exactly parallel light, and its reflected light flux 4 includes light rays larger than the size of the incident light flux 3 in the entrance window. The size of the entrance window that allows the light flux of a larger cross section than the cross section to be passed through is required.

[0003]

In the conventional integrating sphere device, as described above, the light beam entrance window is relatively large and the aperture ratio is not good. The opening ratio of the integrating sphere is the sum of the area of the integrating sphere opening / the area of the inner wall of the integrating sphere, and it is preferable that this is small in order to sufficiently scatter the light entering the integrating sphere without loss.

An object of the present invention is to obtain an integrating sphere device having a small aperture ratio under the same light flux size as the conventional one.

[0005]

In order to achieve the above object, in the integrating sphere device of the present invention, a light beam is made to enter two reflection measurement windows at an incident angle of 0 ° and a predetermined incident angle. At the same time, the incident window on the side of the incident angle of 0 ° is made large enough to pass the specular reflected light, and the incident window on the side of the predetermined incident angle is made large enough to pass only the incident light beam.

[0006]

[Operation] In the integrating sphere device configured as described above, the opening area of one of the entrance windows can be made small, so that the opening ratio of the integrating sphere becomes smaller accordingly, and the measurement is performed at the reflection measurement window on the incident angle 0 ° side. By arranging the sample, arranging the standard sample in the reflection measurement window on the side of the predetermined incident angle, and letting the measurement light beam enter the integrating sphere at the incident angle of 0 ° and the reference light beam at the predetermined incident angle, respectively, Diffuse reflection measurement can be performed using only the diffuse reflection component obtained by completely removing the specular reflection component from the measurement sample.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1, the integrating sphere body 1 has two reflection measurement windows in which a reflection measurement sample 2 or a standard sample 2 is arranged. Then, corresponding to this, two incident windows A and B for allowing the measurement light beam or the reference light beam to enter the integrating sphere 1 are provided. One of the incident windows A is arranged so that the incident light beam enters the corresponding sample at a predetermined incident angle. This incident angle is set so that the reflected light flux of the light flux entering the integrating sphere does not return to the entrance window again.

Like the conventional integrating sphere shown in FIG. 2, the B-side entrance window has an opening area large enough to allow the specularly reflected light flux 4 from the sample corresponding to the incident light flux 3 to pass through. (A'xb '). On the other hand, in the A-side entrance window, the incident light beam 3 entering from the A-side entrance window has a predetermined incident angle, and all the reflected light beams from the corresponding sample are captured by the inner wall of the integrating sphere. It is the opening area. That is, a × b (a <a ′, b <b
´). Therefore, as compared with the conventional integrating sphere on the inner wall surface of the integrating sphere, the area of the outer hatched portion in FIG. 1B is increased, and the aperture ratio is reduced accordingly.

In the measurement, the diffuse reflection measurement of the sample can be performed by making the reference light beam enter through the A-side entrance window and the measurement light beam through the B-side entrance window, and conversely, through the A-side entrance window. When the measurement light beam is made incident and the reference light beam is made incident through the B side entrance window, specular reflection measurement of the sample can be performed. In this case, the switching of the luminous flux can be easily performed since the spectrophotometer usually has a reference luminous flux / measurement luminous flux switching function.

[0010]

According to the present invention, it is possible to reduce the aperture ratio of the integrating sphere while keeping the light flux size unchanged from the conventional one.

[Brief description of drawings]

FIG. 1 is a diagram showing an integrating sphere device of the present invention and an entrance window opening area.

FIG. 2 is a diagram showing a conventional integrating sphere device and an entrance window opening area.

[Explanation of symbols]

 1 ... Integrating sphere body 2, 2 ... Reflection measurement sample or standard sample 3 ... Incident light flux 4 ... Reflected light flux

Claims (1)

[Claims] 1. A double-beam integrating sphere device is configured so that a light beam is incident on two reflection measurement windows at an incident angle of 0 ° and a predetermined incident angle, and the incident window on the incident angle 0 ° side is specularly reflected. An integrating sphere device having a size that allows light to pass therethrough, and a size that allows only an incident light beam to pass through an entrance window on a predetermined incident angle side.