JP2005134146A - Transmitted light detection cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmitted light detection cell for changing the optical path length of transmitted light within a single cell body. <P>SOLUTION: In this transmitted light detection cell, light 32, 34 is irradiated from a light emitting element 28 to a specimen liquid 22 introduced into the cell body 12 and the light transmitted by the specimen liquid is detected by a light receiving element 30. A transparent solid body 102 is detachably disposed within the cell body 12 so as to block the optical path of the light 32, 34. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a transmitted light detection cell that irradiates a sample liquid introduced into a cell body and detects light transmitted through the sample liquid. More specifically, the optical path length of light transmitted through the sample liquid is changed. The present invention relates to a transmitted light detection cell capable of performing the above. The transmitted light detection cell of the present invention is used, for example, in a water quality measuring device such as a turbidimeter and a chromaticity meter.

  Conventionally, in an optical densitometer that measures turbidity and chromaticity in a sample solution, there is a transmitted light detection cell that irradiates the sample solution introduced into the cell body and detects the light transmitted through the sample solution. in use. As an example of such a transmitted light detection cell, there is a configuration shown in FIG. The transmitted light detection cell 10 is used for a throw-in turbidimeter that is submerged in water and measures the turbidity of water.

  In the transmitted light detection cell 10 of FIG. 5, reference numeral 12 denotes a cell body. The cell body 12 includes a cylindrical peripheral wall body 14, a disk-shaped transparent window 16 installed at the upper end of the peripheral wall body 14, and a disk-shaped mirror 18 installed at the lower end of the peripheral wall body 14. . A racetrack-shaped long hole 20 is formed in the peripheral wall body 14, and the sample liquid 22 flows into the cell body 12 through the long hole 20. A concave mirror process 24 is applied to the upper surface of the mirror 18.

  In the transmitted light detection cell 10 of the present example, reference numeral 26 denotes an optical block attached on the cell body 12. Inside the optical block 26, a light emitting element (LED) 28 and a light receiving element (PD) 30 are arranged. The light 32 irradiated from the light emitting element 28 to the sample liquid 22 is reflected by the concave mirror 24 on the upper surface of the mirror 18, and the reflected light 34 is detected by the light receiving element 30. That is, in the transmitted light detection cell 10 of this example, the light is reflected by the concave mirror 24 to increase the optical path length of the light that passes through the sample liquid in the cell body 12.

  In the transmitted light detection cell 10 of the present example, reference numeral 36 denotes a cylindrical cover disposed around the cell body 12. A gap 38 is formed between the cell body 12 and the cover 36, and when the transmitted light detection cell 10 is submerged in water, water flows into the gap 38 from the lower end of the gap 38, and the gap 38 The bubbles in the water are degassed. In this case, by controlling the inflow speed of water from the lower end of the gap 38 with appropriate means, bubbles in the water can be successfully defoamed.

  For example, Patent Documents 1 to 3 are disclosed as conventional techniques for irradiating a sample liquid with light and detecting light transmitted through the sample liquid.

JP-A-7-27700 JP-A-9-2834 Japanese Patent Laid-Open No. 11-241987

  In the turbidimeter, the optical path length of light passing through the sample liquid in the cell body (hereinafter sometimes simply referred to as “optical path length of transmitted light”) is set to an appropriate range according to the turbidity of the water to be measured. There is a need. That is, when the turbidity is low, it is necessary to lengthen the optical path length, and when the turbidity is high, it is necessary to shorten the optical path length.

  Therefore, in the instrument that is carried to the site like the throwing-type turbidimeter described above and performs measurement under various conditions, in order to set the optical path length in the appropriate range according to the turbidity of the measurement target water, A plurality of cell bodies having different cell lengths are carried, and cell bodies having appropriate cell lengths are selected on site. However, it is troublesome to carry a plurality of cell bodies, and it is disadvantageous in cost to produce a plurality of cell bodies.

  On the other hand, also in the prior art described in Patent Documents 1 to 3, in order to change the optical path length according to the concentration, it has a complicated configuration such as providing a plurality of flow paths and a plurality of light receiving elements corresponding thereto. Yes.

  An object of the present invention is to provide a transmitted light detection cell capable of changing the optical path length of transmitted light within a single cell body, even in view of the circumstances described above.

  In order to achieve the above object, the present invention provides a transmitted light detection cell for irradiating light to a sample liquid introduced into a cell body and detecting light transmitted through the sample liquid so that the light path is blocked in the cell body. Provided is a transmitted light detection cell comprising a transparent solid that can be arranged.

  In the transmitted light detection cell of the present invention, when a transparent solid is disposed in the cell body, the transparent solid blocks the optical path, so that the optical path length of the light that passes through the sample solution is the same as the length of the light passing through the transparent solid. Becomes shorter. Therefore, in the transmitted light detection cell of the present invention, the optical path length of the light transmitted through the sample liquid in the single cell body is selected by selecting either the state where the transparent solid is not disposed in the cell body or the state where the transparent solid is disposed. Can be changed.

  In this case, in the transmitted light detection cell of the present invention, one transparent solid is arranged in the cell body, and the optical path length of the transmitted light can be changed by this one transparent solid. According to this means, since one transparent solid is arranged in the cell body, the optical path length of the transmitted light can be changed with a simple operation. Moreover, if a plurality of transparent solids having different light transmission lengths are prepared, the optical path length of the transmitted light can be finely changed.

  In the transmitted light detection cell of the present invention, a plurality of transparent solids can be arranged in the cell body, and the optical path length of the transmitted light can be changed by the plurality of transparent solids. According to this means, the optical path length of transmitted light can be finely changed by the combination of transparent solids.

  Further, in the transmitted light detection cell of the present invention, a plurality of transparent solids are arranged in the cell body so as to be spaced apart from each other, and pure water or clean gas is filled between the plurality of transparent solids to transmit the transmitted light. The optical path length can be changed. According to this means, the optical path length of the transmitted light can be finely changed by changing the separation distance of the transparent solid.

  As described above, the transmitted light detection cell of the present invention can change the optical path length of transmitted light within a single cell body.

  Hereinafter, an example of the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of a transmitted light detection cell according to the present invention. In the transmitted light detection cell 100 of this example, in the transmitted light detection cell shown in FIG. 5, one cylindrical transparent solid 102 is provided in the cell body 12 so as to block the optical paths of the irradiation light 32 and the reflected light 34. It is arranged so as to be detachable. The transparent solid 102 is made of a transparent resin. The transparent solid 102 can be disposed in the cell body 12 by appropriate means. Since the other configuration of the transmitted light detection cell 100 of this example is the same as that of the transmitted light detection cell of FIG. 5, the same reference numerals are given to the same components in FIG. To do.

  In the transmitted light detection cell 100 of this example, when the transparent solid 102 is arranged in the cell body 12, the light transmitted through the sample liquid 22 is the length that the irradiation light 32 and the reflected light 34 pass through the transparent solid 102. The optical path length is shortened. Therefore, the transmitted light detection cell 100 of this example can change the optical path length of the light which permeate | transmits a sample liquid within the single cell main body 12 with the transparent solid 102. FIG.

  2 to 4 are diagrams schematically illustrating other examples of the transmitted light detection cell according to the present invention. In the transmitted light detection cell 200 of FIG. 2, the light 32 irradiated from the light emitting element 28 to the sample liquid 22 is reflected twice by the upper surface of the V-shaped mirror 202, and the reflected light 34 is detected by the light receiving element 30. In the light detection cell, one transparent solid 204 is detachably disposed in the cell body 12 so as to block the optical paths of the irradiation light 32 and the reflected light 34.

  In the transmitted light detection cell 300 of FIG. 3, the light 32 emitted from the light emitting element 28 passes through the half mirror 302, and the light 32 irradiated to the sample liquid 22 is reflected by the upper surface of the flat mirror 304. In the transmitted light detection cell that is reflected by 302 and detected by the light receiving element 30, two transparent solids 306 are detachably arranged in the cell body 12 so as to block the optical paths of the irradiation light 32 and the reflected light 34. It is.

  The transmitted light detection cell 400 in FIG. 4 is a transmitted light detection cell in which the light 32 irradiated from the light emitting element 28 to the sample liquid 22 is detected by the light receiving element 30 facing the light emitting element 28. In the cell body 12, two transparent solids 402 are arranged so as to be detachable from each other so as to be blocked, and pure water 404 is filled between the two transparent solids 402. Note that pure gas 404 may be used instead of pure gas.

  As can be seen from FIGS. 2 to 4, the transmitted light detection cell of the present invention is not limited to the turbidity measurement type, the throw-in type, and the light reflection type like the transmitted light detection cell shown in FIG. 1. In the description of FIG. 1, the transparent solid is formed of a transparent resin. However, the material of the transparent solid is not limited to the resin, as long as it does not hinder light transmitted through transparent glass or the like. Good.

It is a schematic sectional drawing which shows an example of the transmitted light detection cell which concerns on this invention. It is a figure which shows typically the other example of the transmitted light detection cell which concerns on this invention. It is a figure which shows typically the other example of the transmitted light detection cell which concerns on this invention. It is a figure which shows typically the other example of the transmitted light detection cell which concerns on this invention. It is a schematic sectional drawing which shows an example of the conventional transmitted light detection cell.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Cell main body 14 Perimeter wall body 16 Transparent window 18 Mirror 20 Long hole 22 Sample liquid 24 Concave mirror 26 Optical block 28 Light emitting element 30 Light receiving element 32 Irradiation light 34 Reflected light 100 Transmitted light detection cell 102 Transparent solid 200 Transmitted light detection cell 202 V-shape Shaped mirror 204 Transparent solid 300 Transmitted light detection cell 302 Half mirror 304 Flat mirror 306 Transparent solid 400 Transmitted light detection cell 402 Transparent solid 404 Pure water

Claims (4)

  In the transmitted light detection cell that irradiates light to the sample liquid introduced into the cell body and detects the light transmitted through the sample liquid, the cell body has a transparent solid that is detachably disposed so as to block the optical path. A transmitted light detection cell.   The transmitted light detection cell according to claim 1, wherein one transparent solid is disposed in the cell body.   The transmitted light detection cell according to claim 1, wherein a plurality of transparent solids are arranged in the cell body. 2. The transmitted light detection cell according to claim 1, wherein a plurality of transparent solids are disposed in the cell body so as to be spaced apart from each other, and pure water or clean gas is filled between the plurality of transparent solids.