JPH0385429A - Spectrophotometer - Google Patents

Abstract

PURPOSE:To enable easy checkup of the position of alight flux at the outlet of an integrating sphere at the time of measurement of such a body to be inspected s to change the optical axis or at the time of maintenance service and to prevent a mistake in measurement, by a construction wherein an opening- closing window for checking up the position of the light flux is fitted in the direction of advance of a light from the exit of the integrating sphere and it is made to open at the time of checkup and to close at the time of measurement. CONSTITUTION:An opening-closing window 10 which can open and close in the direction of advance of light is fitted in the vicinity of the exit of an integrating sphere 5 and it is made to open at the time of checkup and to close at the time of measurement. A body to be inspected is set in a measuring unit and thin paper is placed at the exit of the integrated sphere. Thereby it is made possible to look directly at and check up with ease the position of the flux of the light emitted from the body to be inspected, at the exit of the integrating sphere 5, and mistake in measurement can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to confirmation of the optical axis position in transmittance and reflectance measurements.

[Conventional technology]

As shown in FIGS. 8 and 9, the conventional device has a cover 25 that can be opened and closed above the integrating sphere.
In order to confirm the position of the light beam at the exit of the integrating sphere, it is known to remove the entire cover or look through it with a viewing mirror.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account the confirmation of the optical axis, and has the inconvenience of having to remove the entire cover 24 or use a viewing mirror.

The present invention aims to eliminate measurement errors by making it possible to easily confirm the position of the light beam at the exit of an integrating sphere during measurement of a subject that changes the optical axis or during maintenance services.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, an opening/closing window is installed in which the position of the light beam can be confirmed from the exit of the integrating sphere in the direction in which the light travels, and is opened for confirmation and closed for measurement.

[Effect]

By attaching a viewing window near the exit of the integrating sphere that can be opened and closed in the direction in which the light travels, the object to be examined can be set in the measurement unit and the position of the light emitted from the object can be easily viewed directly by placing a thin piece of paper at the exit of the integrating sphere. This prevents measurement errors from occurring.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. 1 is a spectrophotometric source, 2 is a spectrometer that has a spectrometer that separates white light into monochromatic light and an optical system that divides it into reference light BFI and sample light Bs, and 3 is an integrating sphere 5 that converts reference light BR and sample light Bs into
A mirror 4 for guiding the sample light to a mask changes the size of the luminous flux of the sample light according to the size of the object, and a mirror 5 directs the monochromatic light to a white plate 6.
The integrating sphere is completely diffused by the inner wall of the integrating sphere (coated with barium sulfate), and the average light is taken into the phototube 9 through the inner wall window 10 of the integrating sphere. The diffuser plate attached to the exit of the integrating sphere 5 is used as a standard plate. 7 is the cover of the spectrophotometer and the integrating sphere 5
There is a window near the sample light side where the light incident on the integrating sphere can be confirmed when the lid 8 is removed.

The lid 8 is attracted and fixed by the magnetic rubber 11 attached to the magnetic rubber mounting plate 12, but when checking the light, it can be easily removed by pulling the knob 13.

Because of this configuration, it is possible to check the positions 15 (during baseline correction) and 16 (at fixed time) of the light beam when measuring the transmittance of the thick plate glass 14 shown in FIG. 5, and to check the concave lens 17 shown in FIG. 6. In addition, mirrors 19 and 2 are placed in front of the integrating sphere 5 as shown in FIG.
It is possible to easily confirm the position 23 of the light beam when simultaneously measuring the light reflected from the front and back surfaces of a thick glass made of 1.22.

Cover 7 also includes confirmation of the optical axis during periodic inspection of the spectrophotometer.
It can be easily done without removing.

〔Effect of the invention〕

Since the present invention is configured as described above, the position 1 of the light beam when measuring the transmittance of a thick plate glass as shown in FIG.
5 (during baseline correction) and the luminous flux! ! 16 (during measurement), the position of the light beam 18 when measuring the transmittance of the concave lens 17 shown in FIG. 6, and the position of the light beam 18 shown in FIG. Since the position of the light beam 23 can be easily confirmed when simultaneously measuring the front and back reflected light of a thick plate glass, there are fewer measurement errors, and regular inspections of the spectrophotometer cover the optical axis confirmation at the exit of the integrating sphere. This can be done quickly without removing 7.

[Brief explanation of drawings]

Fig. 1 is an optical system diagram of a spectrophotometer that adopts the present invention, Fig. 2 is a plan sectional view of a cover portion that specifically adopts the present invention, Fig. 3 is a side sectional view of Fig. 2, and Fig. 4 The figure is a front view of Figure 2, Figure 5 is a diagram showing the change in the optical axis of the sample light when measuring the transmittance of a thick plate glass, Figure 6 is a diagram showing the enlargement of the sample light when measuring the transmittance of a concave lens, Figure 7 shows the change in luminous flux when measuring the front and back reflections of a thick plate glass with a reflectance measuring unit installed in front of the integrating sphere, and Figures 8 and 9 show the conventional device. FIG. l... Spectrophotometric light source section, 2... Spectrometer, 3... Mirror 4... Mask, 5... Integrating sphere, 6... White plate,
7...Cover 8...Lid, 9...Phototube (photomaru), 11...Magnetic rubber, 12...Magnetic rubber mounting plate, 13...Knob, 14.20...Thick plate glass , 17...Concave lens, 15°16°18°23...Baseline 1st Figure 8ρ i2 Figure 3 Figure 4 Figure 5 Figure 8 Figure 9

Claims (1)

[Claims] 1. In a spectrophotometer that uses an integrating sphere as the photoelectric conversion unit and sets the object in front of the integrating sphere to measure transmittance and reflectance, the light flux incident on the integrating sphere is measured at the exit of the integrating sphere. A spectrophotometer characterized by having an observation window that can be opened and closed in the direction of light propagation so that it can be checked from the outside.