JPS62129726A - Spectrophotometer - Google Patents

Abstract

PURPOSE:To achieve a higher versatility of an integrating sphere type spectrophotometer, by a method wherein the reflected lights of a sample are made incident into the spectrophotometer for optical processing and then the luminous intensity thereof is detected with a photodetector to make it applicable as an optical fiber type simply by modifying it. CONSTITUTION:A spectrophotometer has a case body 3 supported with a strut 2 of a base 1, which incorporates an integrating sphere 4, a lighting unit 5 and an opto-electric processing unit 6. The opto-electric processing unit 6 is made up of a rotary reflecting mirror 11 facing an emission hole 4c formed on the top of the integrating sphere 4, an image forming lens 12, a spectroscope 13, a photodetector 14 and an output unit 15. With the rotation of the rotary reflecting mirrors 11, the reflected light (a) of a reference sample (A) and a reflected light (b) of a sample (B) are made incident into a spectroscope 13 alternately for optical processing. Then, the luminous intensity thereof is detected with a photodetector 14, electrically processed with the output unit 15 and outputted on an external monitor, a printer or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention particularly relates to an improvement in an integrating sphere type spectrophotometer.

(Prior art) Conventionally, a reference sample is set at a first predetermined position on the spherical surface of an integrating sphere, a sample is set at a second predetermined position, and each sample is illuminated with light from an illumination lamp that is diffusely reflected within the integrating sphere. An integrating sphere-type spectrophotometer has been proposed in which light is illuminated under the same conditions, and the reflected light from each sample is alternately incident on a spectrometer for optical processing, and then the luminous intensity is detected using a photodetector.

However, with this photometer, it is necessary to set the sample at a predetermined position on the integrating sphere, so it is only possible to set a sample in the form of a strip of cloth, for example, a few centimeters square. It was not possible to detect the luminous intensity.

For this reason, we modified the integrating sphere spectrophotometer to obtain j1ζi
Light from a bright lamp is guided through two optical fibers to illuminate the sample at the desired position and the reference sample under the same conditions, and the reflected light from each sample is guided through two optical fibers and sent to a spectrometer. A fiber-optic spectrophotometer has been proposed, but converting an integrating sphere type to an optical fiber type as mentioned above would require extensive modification, and the cost of modification would be high. There was a problem.

(Purpose of the Invention) The present invention has been made to solve the above-mentioned problems of the conventional art, and by making slight modifications to an integrating sphere type spectrophotometer, it can be used as an optical fiber type, increasing its versatility. The purpose is to

(Structure of the Invention) Therefore, in the present invention, the main body is provided with at least an integrating sphere and a lighting unit, and the light from the lighting unit is diffusely reflected within the integrating sphere. A measurement unit that is movable so as to face a sample at a position, a first optical fiber, and a second optical fiber are provided, and one end and the other end of the first optical fiber are connected to the measurement unit and the illumination unit of the main body. One end and the other end of the second optical fiber are removably connected to the measuring unit and the integrating sphere of the main body, respectively, and the light from the illumination unit is connected to the measuring unit and the integrating sphere of the main body through the first optical fiber. The illuminated sample is exposed to a predetermined position on the spherical surface of the integrating sphere via a second optical fiber and is illuminated, and the reflected light from the sample is input to a spectrometer and optically processed. Afterwards, the luminous intensity is detected by a photodetector.

(Effects of the Invention) According to the present invention, a sample located at an arbitrary position outside the main body can be
The sample is illuminated with light from the illumination unit inside the main body through the first optical fiber of the measurement unit, and appears at a predetermined position on the integrating sphere inside the main body through the second optical fiber, and the reflected light from the sample enters the spectrometer. Therefore, a measuring unit is provided for the integrating sphere type spectrophotometer, and the first optical fiber and second optical fiber of the measuring unit are slightly connected to and detachable from the illumination unit of the main body and the integrating sphere. By simply modifying it, it can be used as an optical fiber type.

Therefore, in addition to increasing versatility, modification is also easy and the cost of modification is low.However, compared to the optical fiber type, since an optical fiber is not used as a reference target, the variation in detection accuracy due to the target fiber can be halved. , the detection accuracy is improved.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the spectrophotometer includes a case body 3 supported by columns 2 of a base l, and inside the case body 3, an integrating sphere 4, an illumination unit 5, and an optical - An electrical processing unit 6 is built-in.

” - The internal spherical surface 4a of the recording sphere 4 is formed as a reflective surface, so that the light from the lighting unit 5 that enters from the lamp hole 4b formed on the side is uniformly diffused and reflected on the spherical surface 4a. It has become.

A reference sample A is placed at a first predetermined position on the spherical surface 4a of the integrating sphere 4.
is illuminated, and the reference sample A is illuminated with the diffusely reflected light.

The lighting unit 5 is housed in a lighting box 7 provided in the case body 3, and a lamp hole 7a facing the lamp hole 4b of the integrating sphere 4 is formed in the side wall of the lighting box 7. Inside the illumination box 7, there is provided an illumination (halogen) lamp 8 and a concave reflector 9 for condensing the light from the illumination lamp 8 and directing it into the integrating sphere 4 through the lamp holes 7a and 4b. is provided.

The optical-electrical processing unit 6 includes a rotating reflecting mirror 11 facing the exit hole 4c formed in the upper part of the integrating sphere 4;
It is composed of an imaging lens 12, a spectrometer 13, a photodetector 14, and an output device 15, and the rotation of the rotating reflector 11 causes the reflected light a to the reference sample and the sample 13 (described later).
After the reflected light beams are alternately incident on the spectroscope 13 and optically processed, the light intensity is detected by the photodetector I4. It will be output to a computer, printer, etc.

On the other hand, as shown in FIG. 5, a measuring unit 17 of the first embodiment is provided which is movable so as to face the sample B located at any position outside the case body 3.

The measuring unit 17 includes a hollow measuring block 18 having a substantially trapezoidal cross section.2 When the lower surface 18a of the measuring block 18 is directed to the sample B, the hollow portion 18b is shielded from external light. There is.

A vertical (0 degree) first connection hole 18c is formed in the upper part of the measuring block 18, and a second connection hole 18c inclined at about 45 degrees is formed in the side part.
A connecting hole 18d is formed.

Two optical fibers 21 covered with synthetic resin material 20.
22 are provided, the first. A metal end holder 23 is fitted to each one end 21a, 22a and each other end 21b, 22b of the second optical fiber 21.22.

Above 1st. Each one end 21 of the second optical fiber 21, 22
A, 22a and each end holder 23 of the other end 21b of the first optical fiber 21 further includes a lens holder 25.a, which supports a lens 24. ..., 25 are fitted.

The lens holder 25 of the one end 21a of the first optical fiber 21 is attached to the first connecting hole 1 of the measurement block 18.
The lens holder 25 at one end 22a of the second optical fiber 22 is removably fitted into the second connecting hole 18d of the measurement block 18, and is fixed with a set screw or the like. Fix it with set screws etc.

Further, the lens holder 25 at the other end 21b of the first optical fiber 21 is removably fitted into an adapter ring 26 attached to the side wall of the illumination box 7 in the case body 3 so as to face the illumination lamp 8. and fixed with set screws etc.

As shown in detail in FIG.
Insertion grooves 3a, 3 are provided on the bottom wall of the case body 3 facing d.
a is formed, and the insertion groove 3a.

A flat fiber holder 27 is removably inserted into 3a.

A connecting hole 27a is formed in the fiber holder 27, and the end holder 23 of the other end 22b of the second optical fiber 22 is removably fitted into the connecting hole 27a.
Fix it with set screws etc.

At this time, the end surface 22c of the other end 22b of the second optical fiber 22 is set at a second predetermined position on the spherical surface 4a of the integrating sphere 4.

With the above-mentioned configuration, the first tube has the optimum length and thickness for measuring the luminous intensity of the sample B located at any position outside the case body 3. Prepare a second optical fiber 21.22,
The lens holder 25.25 of one end 21a, 22a of each optical fiber 21.22 is fitted and fixed into each connection hole 18c, +8d of the measurement block 18, and the lens holder 25 of the other end 21b of the first optical fiber 21 is fixed. It is fitted and fixed to the adapter ring 26 of the illumination box 7, and the end boulder 23 of the other end 22b of the second optical fiber 22 is fitted and fixed to the connection hole 27a of the fiber holder 27.

Then, holding the measurement block 18 by hand, place the lower surface 18a on the sample B located at an arbitrary position.

Then, the light from the illumination lamp 8 is transmitted to the first optical fiber 21.
The reflected light from the sample B is guided by the second optical fiber 22 and illuminates the sample B, and the reflected light from the sample B is guided by the second optical fiber 22 and illuminates the other end 2.
It comes to appear at a second predetermined position on the end face 22C1 of the sphere 2b, that is, on the spherical surface 4aJ2 of the integrating sphere 4.

On the other hand, since the reference sample A is placed at the first predetermined position on the spherical surface 4a of the integrating sphere 4, the sample B that appears at the second predetermined position is transferred to the sample at the first predetermined position. Spherical surface 4a
be illuminated under the same conditions by diffusely reflected light that is uniformly diffused and reflected.

Then, the reflected light a of the reference sample A and the reflected light S of the sample B are:
As the rotating reflecting mirror 11 rotates, the light is alternately incident on the spectroscope 13 and optically processed, then the light intensity is detected by the photodetector 14, electrically processed by the output device 15, and output to an external monitor or the like.

In this way, the existing integrating sphere type spectrophotometer has the first. Since the second optical fibers 21 and 22 can be connected, the modification is easy and the versatility of the integrating sphere type spectrophotometer can be increased.

6 and 7 show a measurement unit 30 according to a second embodiment, in which one end 21a of the first optical fiber 21 is formed into a ring shape, and one end 22a of the second optical fiber 22 faces the center of the ring. , integrally insert-molded with a synthetic resin 20, and at the bottom of the synthetic resin 20,
A tapered cone-shaped skirt portion 20a is integrally provided,
The lower surface of the skirt portion 20a is directed toward the sample B.

With this configuration, the measurement block 18, end holder 23. The lens holder 25 etc. can be omitted.

FIG. 8 shows a measurement unit 31 of the third embodiment, and the measurement unit 31 is of a semi-fixed type placed on a desk or the like.

As shown in the figure, a dark box-shaped measurement case 32 is provided, and a first support plotter 3. 1 and a second lens holder 25 of one end 22a of the second optical fiber 22 are fitted and fixed.
Support blocks 35 are arranged opposite to each other at a predetermined interval,
1st. The sample block 36 is arranged to sandwich and hold the sample B between the second support blocks 34 and 35.

This configuration is optimal when sample B has transparency.

9 and 10 show the measuring unit 38 of the fourth embodiment.
The measuring unit 38 is of a semi-fixed type as in the third embodiment, and is most suitable for the sample B having a certain transmittance.

As shown in the figure, the second optical fiber 2 is placed on the substrate 39.
a second support block 41 supporting a moving block 40 that fits and fixes the lens holder 25 at one end 22a of the second support block 41;
Lens boulder at one end 21a of the first optical fiber 21
A first support block 42 to which the first support block 25 is fitted and fixed is placed opposite to the first support block 42 with a predetermined interval therebetween, and is fastened and fixed with a bolt 43.

A fixing block 44 is attached to the front surface of the first support block 42 , and a front recess 44 a of the fixing block 44 has a pinhole plate 45 that coincides with the end surface of the first optical fiber 21 .
is provided.

On the front surface of the second support block 41, the moving block 4 is provided.
4 guide shafts 46. Coil springs 47, . . . , 47 supported by 46 so as to be movable back and forth, and compressed between the moving block 40 and the second support block 41
As a result, the movable block 40 is urged toward the fixed block.

A pin pole plate 48 that coincides with the end surface of the second optical fiber 22 is provided in the front recess 40 a of the moving block 40 .

Therefore, with the movable block 40 moved backward against the biasing force of the coil spring 47, the sample B is inserted into the gap between it and the fixed block 44, and the movable block 10 is moved forward by the biasing force of the coil spring 47. fixed block 44.
The sample B is sandwiched and held between the front surface of the moving block 40 and the curved surface of the moving block 40.

According to this configuration, samples B with different thicknesses can be set quickly, and depending on the thickness of the sample B, the guide shaft 46
Since the stroke amount is different, there is a scale 46 on the guide shaft 46.
If a is attached, the back surface 41a of the second support block 4I
The thickness of sample B can be known at the same time.

In addition, since the sample B is sandwiched between the fixed block 44 and the moving block 40, the measurement part of the sample B is not affected by external light, and there is no need for a dark box or the like to cover the measurement unit 38. Since there is no need to open and close the dark box etc. each time sample B is replaced, sample B can be replaced quickly.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main part of a spectrophotometer according to the present invention, FIG. 2 is a sectional front view of the main part of FIG. 1, FIG. 3 is a sectional side view of the main part of FIG. 2 is an enlarged sectional view of the main parts of FIG. 2, FIG. 5 is a 1-fold cross-sectional view of the measuring unit of the first embodiment, FIG. 6 is a sectional view of the measuring unit of the second embodiment, and FIG. 7 is a cross-sectional view of FIG. 6. 8 is a sectional view of the measuring unit of the third embodiment, FIG. 9 is a perspective view of the measuring unit of the fourth embodiment, and FIG. 10 is a sectional view of the measuring unit of the fourth embodiment.
FIG. 3... Case body, 4... Integrating sphere, 4a...
- Spherical surface, 5... Illumination unit, 6... Optical-electrical processing unit, 13... Spectrometer, 14... Photodetector, +
7.30, 31.38...Measuring unit, 21...
-First optical fiber, 21a...one end, 21b...other end, 2
2... Second optical fiber, 22a... One end, 22b... Other end, A
...Reference sample, B...Sample, a, b...
reflected light.

Claims (1)

[Claims] (1) The main body is provided with at least an integrating sphere and an illumination unit, and the light from the illumination unit is diffusely reflected within the integrating sphere. A movable measurement unit, a first optical fiber, and a second optical fiber are provided, one end and the other end of the first optical fiber are removably connected to the measurement unit and the illumination unit of the main body, respectively, One end and the other end of the second optical fiber are removably connected to the measuring unit and the integrating sphere of the main body, respectively, and the sample illuminated by the light from the illumination unit via the first optical fiber is The reflected light from the sample enters a spectrometer and is optically processed, and then the light intensity is measured by a photodetector. A spectrophotometer characterized in that it is adapted to be detected.