JPS62245944A - Light source device for concentration measurement - Google Patents

Abstract

PURPOSE:To measure concentration with high-accuracy by arranging optical fibers of two systems and two condenser lens in combination across a light source. CONSTITUTION:Projection end surfaces of bundle fibers 6 and 7 formed by bundling optical fibers of two systems are arranged nearby a measurement surface 1a. Incidence end surfaces 6a and 7a of the bundle fibers 6 and 7, on the other hand, are arranged across the light source 5 and two condenser lenses 8 and 9 are provided between the end surfaces 6a and 7a. Thus, the two lenses 8 and 9 and bundle fibers 6 and 7 are arranged across the light source 5 in an array in such a direction that the light source 5 is easy to vibrate. Therefore, if the light source 5 is displaced toward one condenser lens owing to vibration, the sum of the quantities of light emitted by the bundle fibers 6 and 7 of the two systems does not vary greatly because the light source becomes distant from the other condenser lens. Therefore, irradiation light is emitted to an invariably uniform quantity and the concentration is measured with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a light source device for density measurement that is used in a reflection density measurement device or the like and irradiates a measurement surface with light. The present invention relates to a constant angle light source device that can always keep the amount of light substantially constant.

(Technical Background and Prior Art of the Invention) In recent years, it has become possible to quantitatively analyze specific chemical components or formed components contained in a sample liquid, such as blood or taste, by simply supplying a small droplet of the sample liquid. Dry type chemical analysis slides have been developed (Japanese Patent Publication No. 53-21677, JP-A-55-164356@, etc.), and these chemical analysis slides can be used to analyze chemical components in sample liquids. Various reflection density measuring devices have also been proposed.

Analysis of the chemical components in the sample solution using the above-mentioned reflection concentration measuring device involves dot-feeding the sample solution onto a chemical analysis slide, and then keeping it at a constant temperature for a predetermined period of time in an incubator (incubator) within the measuring device. ), a color reaction (pigment formation reaction) occurs, and the color optical m degree is optically measured,
That is, the chemical analysis slide is irradiated with measurement irradiation light containing a wavelength that is pre-selected based on the combination of the component to be measured in the sample solution and the reagent contained in the reagent layer of the chemical analysis slide, and the reflected optical density is measured. However, this is mainly carried out by quantitatively analyzing the content of the substance to be measured using the principle of colorimetry. The measurement of the reflection density is performed by irradiating the sample surface with irradiation light and placing a measurement head near the measurement surface (disposed) having an optical sensor that receives reflected light from the sample surface.

By the way, in devices that require irradiation of light to measure the concentration of the measurement surface, such as the above-mentioned reflection density measuring device,
A concentration measurement light source device is used to irradiate the measurement surface with concentration measurement light.

This light source device could be considered divine if it allows the light emitted from the light source to enter the measurement surface well, but it also transmits the light source and the light emitted from the light source to the vicinity of the measurement surface. The use of an optical fiber is advantageous in that the measuring head can be made movable.

However, as described above, a light source device using an optical fiber is susceptible to vibrations, and when vibrations occur, there is a problem in that the amount of light irradiated onto the measurement surface is likely to change. In other words, in order to efficiently input the light emitted from the light source into the optical fiber, a condensing lens is usually provided between the light source and the input end face of the optical fiber, but if the light source is captured for some reason inside or outside the light source device, The distance between the light source and the condensing lens changes, and the amount of light incident on the optical fiber changes, so accurate II! This results in the inconvenience of not being able to perform measurements.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and is directed to a light source device consisting of a light source, an optical fiber, and a condensing lens, in which the amount of emitted light hardly changes even when photographing occurs. It is an object of the present invention to provide a light source device for concentration measurement that enables stable and highly accurate concentration measurement without any problems.

(Structure of the Invention) A light source device for concentration measurement of the present invention includes a light source, two optical fibers each having an incident end face disposed sandwiching the light source and an exit end face disposed near a measurement surface, and the light source. and two optical fibers disposed between the input end faces of the two systems of optical fibers.
It is characterized by consisting of two condensing lenses.

That is, in the device of the present invention, two condensing lenses and two systems of optical fibers are placed between each of the light sources, so the light source can easily image the two condensing lenses and the two systems of optical fibers. If they are placed side by side, even if the light source is displaced due to vibration, the light source will approach one condenser lens and move away from the other at the same time, so the amount of light emitted from the two optical fibers will be reduced. The sum does not change significantly. Therefore, it becomes possible to always irradiate the measurement surface with a substantially constant amount of light.

(Actual f!M Mode) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic side view showing an outline of a reflection density measuring device equipped with a light source for measuring reflection density according to one embodiment of the present invention.

The illustrated apparatus includes, for example, four chemical analysis slides 1 containing a sample liquid, an incubator 2 that can accommodate four chemical analysis slides 1 on the same plane, and a measurement surface 1a of the chemical analysis slide 1.
The measuring head 4 is provided with a measuring head 4 that irradiates light onto the measuring surface 1a and receives reflected light reflected by a measuring surface 1a using a photosensor 3 such as a silicon photodiode. This measurement head 4 includes a light source 5 such as a halogen lamp that emits irradiation light suitable for measuring the anti-OA concentration on the measurement surface 1a, and a bundle fiber 6.7, which is a bundle of two small-diameter optical fibers, as will be described in detail later. connected via. These two bundle fibers 6.7 are combined into one fiber in the middle and connected to the measuring head, and in this case, the two bundle fibers 6.
The fibers constituting the fibers 7 are randomly grouped so that the light irradiated onto the measurement surface has an even and smooth distribution. Reference numerals 8 and 9 in the figure are condenser lenses for efficiently making the light emitted from the light source 5 enter the incident end surfaces 6a and 7a of the bundle fiber 6.7 of the two-system projection. In this embodiment, the bundle fiber 6.7 of the optical a5.2 system and the two condensing lenses 8
, 9 constitute a light source device for yA measurement.

In the above measuring device, the measuring head 4 is arranged so that the bundle fiber 6.7 can take a position facing any chemical analysis slide 1 housed in the incubator 2.
The measuring head 4 is movable while deforming the measuring head 4, and the measuring head 4 moves through the turns shown by the arrow A between the position shown by the solid line in the figure and the position shown by the broken line in the figure. If the measurement head 4 is connected to the light source device equipped with the bundle fiber 6.7 in this way, it is possible to extremely easily measure the anti-9A concentration on a plurality of slides 1 without moving the chemical analysis slide 1 side. can.

By the way, when the measurement head 4 moves as described above, imaging occurs along with this movement, so that the light source 5 is
As shown in the figure, it becomes easier to take pictures in the direction of the arrow. When the light source 5 vibrates in this way, if only one bundle fiber and one condensing lens are provided for the light source 5, the distance between the light source and the condensing lens changes and the bundle fiber Although the amount of light transmitted to the measuring head 4 changes, in the apparatus of this embodiment, the two systems of bundle fibers 6° 7 are placed at opposite positions sandwiching the light source 5 in the direction in which vibration is likely to occur. 9A each
End surfaces 6a and 7a are arranged, and the light source 5 and each incident end surface 6a,
Since the condensing lenses 8 and 9 are arranged between the lenses 7a, it is possible to prevent the amount of light transmitted to the measuring head from changing due to imaging.

That is, even if the light source 5 is photographed and is displaced, for example, to a position away from the condenser lens 8 and the amount of light incident on the bundle fiber 6 decreases, the light source 5 simultaneously approaches the other condenser lens 9. This increases the amount of light incident on the bundle fiber 7.

Therefore, the amount of light transmitted by the bundle fiber 6.7 of the second system gun is approximately constant regardless of the presence or absence of vibration of the light source 5. Since the two bundle fibers 6.7 are combined into one from the middle and connected to the measurement head 4, these two bundle fibers 6.7 are connected to the measuring head 4.
The irradiation light consisting of the sum of the lights transmitted by the light sources 7 is substantially constant regardless of the presence or absence of vibration of the light source 5, and the measurement surface 1a is stably irradiated with a predetermined amount of irradiation light. In this embodiment, each of the condensing lenses 8 and 9 is located approximately at a distance from the light source 5, and each of the incident end faces 6a and 9 of the bundle fiber
7a is also approximately at a distance from the light source 5, but the distances mentioned above do not necessarily have to be equal, and the light source is located at a position where the sum of the light incident on the two bundle fibers 6.7 is approximately constant. The positions of each condensing lens and the incident end surface may be set as appropriate within the direction in which vibration occurs.

In addition, in the light source device of this embodiment, the bundle fibers 6.7 of the two systems are combined into one from the middle, but the two systems of optical fibers are independent and their exit end faces are on the measurement surface 1a. For example, as shown in FIG.
7 is connected to the measurement head 14 in which the optical sensor 13 is arranged directly below the measurement surface 1a, each exit end surface 161), 17b 4 of the optical fiber 16.17 of the 2-system gun
Different lights are incident on the side portions of the measurement surface 1a so that they are combined at substantially the same portion of the measurement surface 1a, and the reflected light is reflected by the optical sensor 13.
It may also be arranged at a position where it can be incident on. In this case, not only a bundle fiber but also a single large-diameter fiber can be used as the optical fiber. Further, as described above, regarding the light source device of the present invention, anti-ra
Although the light source device of the present invention has been described using an example of a case where it is used in a measurement device, the light source device of the present invention may be used in any device as long as it irradiates light onto a measurement surface and measures its concentration. For example, it may be used in a measurement device that measures transmitted light of a measurement surface.

(Effects of the Invention) As explained above, according to the light source device for concentration measurement of the present invention, the light source is sandwiched between the two optical fibers and the two optical fibers.
By arranging two condensing lenses in combination, it is possible to always emit a uniform amount of irradiation light even when the light source is activated. Therefore, by using the light source device of the present invention, the accuracy of measurement can be suitably improved, particularly in a concentration measuring device of a moving measurement head type that is susceptible to vibration.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing a foul density measuring device equipped with a light source device for density measurement according to an embodiment of the present invention, FIG. 2 is a partially enlarged view showing the main parts of the light source device, and FIG. FIG. 7 is a schematic diagram showing a connection portion of a light source device according to another embodiment of the present invention with a measurement head. 1a...Measurement surface 5...Light source 6.7...Bundle fiber 6a, 7a...Incidence end face 8,9...Condenser lens Fig. 1, Fig. 2, Fig. 3, 1

Claims (1)

[Scope of Claims] A light source device for concentration measurement that irradiates light onto a measurement surface in order to measure the concentration of the measurement surface, comprising: a light source that emits the light; each incident end face is disposed with the light source sandwiched therebetween; For concentration measurement, comprising two systems of optical fibers each having an exit end face disposed near a surface thereof, and two condenser lenses disposed between the light source and each input end face of the two systems of optical fibers. Light source device.