JP2006275753A - Optical measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the adhesion of dew condensation water or dust/dirt to a light transmission window section, a light-emitting device, and a light receiving device, or the generation of stray light at an optical path section with a simple configuration. <P>SOLUTION: In an optical measuring device, the light-emitting device 4 and the light receiving device 8 are arranged outside a measuring cell 2 having the light transmission window section 13, and an optical element supporting member 38 in which a cylindrical sleeve 46 is formed at the optical path section is fitted outside of the light transmission window section 13 on the light emission and reception sides, thus fitting each light-emitting device 4 and each light receiving device 8 into the sleeve 46. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of an optical measurement device that irradiates a sample accommodated in a measurement cell with light and measures the transmitted light intensity and scattered light intensity of the sample.

  Optical measuring devices are widely used for the purpose of measuring the concentration of specific components in water, such as hardness components, dissolved oxygen, residual chlorine, and suspended solids, and the concentration of soot in exhaust gas. In general, this type of optical measuring device irradiates light from the outside to a measuring cell containing a sample of a predetermined volume, or irradiates light from the outside to a measuring cell continuously circulating the sample, and transmits light intensity. And the concentration of the target substance is measured based on the scattered light intensity.

  For example, Patent Document 1 discloses an optical measurement device that reacts a sample solution with a color-developing reagent, detects discoloration of the sample solution due to this reaction based on transmitted light intensity, and measures the concentration of a specific substance contained in the sample solution. Is disclosed. Here, with reference to FIG. 11 and FIG. 12, the structural example of the measurement part in the conventional optical measuring device is demonstrated. FIG. 11 is a longitudinal sectional view of the measurement unit, and FIG. 12 is a sectional view taken along line XII-XII in FIG.

  The measurement unit 1 includes a bottomed cylindrical measurement cell 2 formed entirely of a transparent member, and a light emitting substrate unit 6 in which a first light emitting element 4 and a second light emitting element 5 are mounted on a light emitting circuit board 3. And a light receiving substrate portion 10 on which a first light receiving element 8 and a second light receiving element 9 are mounted. A light emitting element support portion 11 and a light receiving element support portion 12 are formed on the opposing side surfaces of the measurement cell 2 so as to open outward in a direction orthogonal to the axial center direction of the measurement cell 2. Light transmissive window portions 13 and 13 are formed in portions surrounded by the side walls of the support portions 11 and 12. Here, the opening width of the cross section orthogonal to the axial direction of the measurement cell 2 of the light emitting element support portion 11 is set to be approximately the same as the outer diameter of the light emitting elements 4 and 5. On the other hand, the opening width of the cross section perpendicular to the axial direction of the measurement cell 2 of the light receiving element support portion 12 is set to be approximately the same as the outer diameter of the light receiving elements 8 and 9. In the measurement cell 2, a sample liquid inlet 14 is formed on the side wall below each light transmission window 13, and a sample liquid outlet 15 is formed on the side wall above each light transmission window 13. Is formed.

  A circuit board support 16 for supporting the light emitting circuit board 3 and the light receiving circuit board 7 is formed on the side of the measurement cell 2. The light emitting substrate 6 is fixed by inserting the light emitting elements 4 and 5 into the light emitting element support 11 and connecting the light emitting circuit board 3 and the circuit board support 16 with screws 17. Yes. On the other hand, the light receiving substrate part 10 is fixed by inserting the light receiving elements 8 and 9 into the light receiving element support part 12 and connecting the light receiving circuit board 7 and the circuit board support part 16 with screws 17. Has been.

  In such a configuration, since the light emitting element support part 11 and the light receiving element support part 12 are opened toward the outside, the measuring part 1 has the light transmission window part 13 from the light emitting elements 4 and 5. In some cases, outside air easily flows into the optical path portion to the optical path portion and the optical path portion to the light receiving elements 8 and 9 from the light transmission window portion 13, thereby disturbing the measurement. For example, if a sample solution having a temperature lower than room temperature is measured, condensation may occur in each light transmission window portion 13 and an accurate measurement value may not be obtained. In addition, for example, when used in an environment with a lot of dust, dust may adhere to the light transmission window portions 13, the light emitting elements 4, 5, and the light receiving elements 8, 9, and accurate measurement values may not be obtained. is there. Furthermore, since the entire measurement cell 2 is a transparent member, there is a possibility that an accurate measurement value may not be obtained due to stray light when irregularly reflected light enters the optical path portion.

  Regarding prevention of condensation, conventionally, a configuration in which dry air is circulated in the vicinity of each light transmission window portion 13 (Patent Document 2) and a configuration in which each light transmission window portion 13 is constantly heated by a heater (Patent Document 3). Has been proposed. However, in the former configuration, an apparatus that generates dry air is required, so that the optical measurement device becomes large and is easily restricted by the installation location. In the latter configuration, since the heater is always operated, the electric capacity increases, and the running cost tends to increase. Therefore, any configuration is difficult to implement with a simple optical measurement device that monitors the quality of the water supply water and the quality of the treated water of the water treatment equipment.

  For preventing dust from adhering, for example, a configuration has been proposed in which high pressure gas is blown onto the surface of each light transmission window 13, the surfaces of the light emitting elements 4 and 5, and the surfaces of the light receiving elements 8 and 9. (Patent Document 4). However, this configuration requires a device that generates high-pressure gas, and is not realistic unless the optical measurement device is installed in a facility where compressed air can be used, such as a factory.

  Further, since the measuring unit 1 is not provided with means for guiding the light emitting elements 4 and 5 and the light receiving elements 8 and 9 to a predetermined optical axis position, the measuring units 1 fix the substrate parts 6 and 10. At this time, when the light-emitting elements 4 and 5 and the light-receiving elements 8 and 9 come into contact with the support portions 11 and 12, the optical axis tends to shift. Therefore, in order to ensure a predetermined accuracy, it is necessary to correct the optical axis and calibrate the measurement value after assembly.

Japanese Patent No. 3214400 JP 2000-171389 A JP 56-148040 A JP 59-57142 A

  The first problem to be solved by the present invention is to prevent the formation of condensed water and dust on the light transmitting window, light emitting element and light receiving element, or the generation of stray light in the optical path part with a simple configuration. . A second problem to be solved by the present invention is to prevent the deviation of the optical axis with a simple configuration.

  The present invention has been made to solve the above problems, and the invention according to claim 1 is an optical measuring device in which a light emitting element and a light receiving element are arranged outside a measurement cell having a light transmission window. An optical element support member having a cylindrical sleeve formed in an optical path portion is mounted outside the light transmitting window on the light emitting side and the light receiving side, and the light emitting element and the light receiving element are respectively attached to the sleeve. It is characterized by being installed inside.

  According to the first aspect of the present invention, the optical element support member is attached to the outside of the light transmission window portion, and the light emitting element and the light receiving element are respectively closely supported by being inserted into the sleeve. Is done. That is, the optical path portion from the light emitting element to the light transmitting window portion and the optical path portion from the light transmitting window portion to the light receiving element are kept in an airtight state, and external air including moisture and dust flows into the optical path portion. Is suppressed, and diffused light is prevented from entering the optical path portion. Therefore, it is possible to prevent the condensed water and dust from adhering to the light transmission window portion, the light emitting element and the light receiving element, or stray light from being generated in the optical path portion.

  Further, the invention according to claim 2 is the optical element support according to claim 1, wherein each axis of the light emitting element and the light receiving element is located on the same plane perpendicular to the axis of the measurement cell. It is characterized by mounting a member.

  According to the second aspect of the present invention, the optical element support member is mounted so that the axial centers of the light emitting element and the light receiving element are located on the same plane orthogonal to the axial center of the measurement cell. . That is, the sleeve supports the light emitting element and the light receiving element in a state where the axes of the light emitting element and the light receiving element are positioned on the same plane orthogonal to the axis of the measurement cell. Therefore, deviation of the optical axis is prevented when measuring either the transmitted light intensity or the scattered light intensity.

  Furthermore, the invention described in claim 3 is characterized in that, in claim 1 or 2, the optical element support member is formed of an elastic material.

  According to invention of Claim 3, since the said optical element support member is formed with the elastic material, the optical path part from the said light emitting element to the said light transmissive window part, or from the said light transmissive window to the said light receiving element The optical path portion is kept in a more airtight state, and the outside air including moisture and dust is effectively suppressed from flowing into the optical path portion. The sleeve securely supports the light emitting element and the light receiving element, and the axial centers of the light emitting element and the light receiving element are accurately positioned on the same plane orthogonal to the axis of the measurement cell. . Accordingly, it is possible to effectively prevent dew condensation and dust from adhering to the light transmission window portion, the light emitting element, and the light receiving element, and also prevent the optical axis from being displaced.

  According to the present invention, it is possible to prevent the condensation of water and dust from adhering to the light transmission window, the light emitting element and the light receiving element, or the generation of stray light in the optical path portion with a simple configuration. In addition, the optical axis can be prevented from being displaced with a simple configuration. As a result, the predetermined measurement accuracy in the optical measurement device can be continuously maintained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic configuration diagram in which the optical measuring device according to the present invention is applied to a liquid concentration measuring device for measuring the concentration of a specific component (hardness component, dissolved oxygen, residual chlorine, etc.) in a liquid. In FIG. 1, the optical measurement device 18 mainly includes a measurement unit 1, a reagent supply unit 19, and a control unit 20.

  The measurement unit 1 mainly includes a measurement cell 2, a light emitting substrate unit 6, a light receiving substrate unit 10, and a stirring device 21. The measurement cell 2 is a cylindrical container made of an opaque resin material, and a pair of light transmission window portions 13 and 13 are formed to face each other on the side wall. Here, each of the light transmission window portions 13 is provided with window plates 22 and 22 formed of a transparent material such as glass or synthetic resin in a flat plate shape. In particular, when each of the window plates 22 contains acid, alkali, organic solvent, or the like in a coloring reagent to be described later, it is preferable to use quartz glass as the material because there is no risk of damage due to deterioration of the material.

  The light emitting substrate unit 6 is configured by mounting the first light emitting element 4 and the second light emitting element 5 having different emission wavelengths on the light emitting circuit substrate 3, and the light receiving substrate unit 10 is formed on the light receiving circuit substrate 7. The first light receiving element 8 and the second light receiving element 9 are mounted. Here, each of the light emitting elements 4 and 5 is, for example, an LED, and each of the light receiving elements 8 and 9 is, for example, a photodiode. The light emitting substrate 6 is disposed outside the measurement cell 2 so that the light emitting elements 4 and 5 face one of the light transmitting window portions 13. The light receiving substrate portion 10 is disposed outside the measurement cell 2 so that the light receiving elements 8 and 9 face the other light transmission window portion 13.

The stirring device 21 is provided at the bottom of the measurement cell 2 and includes a stirring bar 23 and a stator 24. The stirrer 23 is rotatably disposed at the bottom of the measurement cell 2. The stator 24 is disposed outside the measurement cell 2 so as to surround the stirrer 23 and includes an electromagnetic induction coil (not shown). When a current is supplied to the electromagnetic induction coil, the stirrer 23 rotates.

  In the measurement cell 2, a sample liquid inlet 14 is provided on a side wall below each light transmission window 13, and a sample liquid inflow path 25 is connected to the sample liquid inlet 14. In the sample liquid inflow path 25, an electromagnetic valve 26, a constant flow valve 27, and a filter 28 are provided in this order from the sample liquid inlet 14 side. On the other hand, in the measurement cell 2, a sample solution outlet 15 is provided on the side wall above each light transmission window 13, and a sample solution discharge path 29 is connected to the sample solution outlet 15. Yes.

  The reagent supply unit 19 mainly includes a reagent storage container 30 and a roller pump 31. The reagent storage container 30 stores therein a coloring reagent in which a coloring agent that reacts with a specific component (hardness component, dissolved oxygen, residual chlorine, etc.) in a sample solution and is colored or changed in color is mixed. The upper part of the measurement cell 2 is connected by a reagent supply path 32. The reagent supply path 32 is provided with the roller pump 31, and a check valve 33 is provided on the downstream side of the roller pump 31. The reagent supply path 32 is a tube made of, for example, an elastic material, and the coloring reagent is discharged from the reagent storage container 30 into the measurement cell 2 by handling the tube with the roller pump 31. .

  The control unit 20 has an output interface (reference number omitted), and a drive signal is output from the output interface to the light emitting circuit board 3, the stator 24, the electromagnetic valve 26, and the roller pump 31. The control unit 20 has an input interface (reference number omitted), and a detection signal from the light receiving circuit board 7 is input to the input interface.

  Here, the operation of the optical measuring device 18 will be described. First, when the electromagnetic valve 26 is opened, the sample liquid continuously flows into the measurement cell 2 from the sample liquid inlet 14 via the sample liquid inflow path 25. At this time, suspended substances and dust contained in the sample solution are captured by the filter 28, and the flow rate of the sample solution is controlled to be constant by the constant flow valve 27. The sample liquid flows from the lower side to the upper side in the measurement cell 2, and when the liquid level reaches the sample liquid outlet 15, it flows out of the system through the sample liquid discharge path 29. In this process, the inside of the measurement cell 2 is cleaned by operating the stirring device 21 and rotating the stirring bar 23. When a predetermined amount of sample liquid is stored in the measurement cell 2, the electromagnetic valve 26 is closed.

  Next, while operating the stirring device 21, the roller pump 31 is driven to supply a predetermined amount of the coloring reagent from the reagent storage container 30 into the measurement cell 2. When a specific component is present in the sample solution, the dye contained in the coloring reagent reacts with the specific component, and the sample solution develops color. When a sufficient time has passed for a specific component in the sample solution and the dye contained in the coloring reagent to elapse, the light emitting elements 4 and 5 are turned on, and the transmitted light intensity is detected by the light receiving elements 8 and 9. To do. Then, based on the plurality of transmitted light intensities detected by the light receiving elements 8 and 9, the control unit 20 determines the concentration of the specific component contained in the sample liquid.

Now, the configuration of the measuring unit 1 will be described in more detail based on the drawings. FIG. 2 is a side view of the measurement cell 2 as viewed from the mounting side of the light transmission window portion 13. Block-like optical member attachment portions 34 are integrally formed on the opposing side surfaces of the measurement cell 2. The optical member mounting portion 34 is provided with a rectangular through window 35 that communicates with the inside of the measurement cell 2. Is provided. And at the four corners of the through window 35, a window plate support portion 37 for supporting the window plate 22,
37,... Are formed. That is, the window plate 22 is inserted into the through window 35 and mounted in a state supported by the window plate support portions 37 from the inside of the measurement cell 2.

  A step portion 39 for fitting an optical element support member 38 to be described later is provided on the periphery of the opening portion of the through window 35. Further, on the opening surface of the through window 35, first through holes 41, 41,... For bolting a pressing member 40 described later are provided at the four corners of the optical member mounting portion 34, respectively. Furthermore, pin insertion holes 42 and 42 for positioning the pressing member 40 are provided in the opening surface of the through window 35, respectively.

  Next, the optical element support member 38 will be described with reference to FIGS. 3 is a front view of the optical element support member 38 as viewed from the side facing the measurement cell 2, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 4 is a rear view of the element support member 38. FIG.

  The optical element support member 38 is formed of an elastic material and functions as a so-called packing. As the elastic material, a material that is not easily deteriorated by a chemical or a solvent, such as ethylene propylene rubber, silicon rubber, or fluorine rubber, can be used. The optical element support member 38 is provided with three through holes 44, 44,... In a plate-shaped packing portion 43, and each of the through holes 44 has an annular shape on the front side. 1st protrusion part 45,45, ... is each provided. Further, the optical element support member 38 is formed with cylindrical sleeves 46, 46,... Rising from the peripheral edge of each through hole 44 on the back side, and the outer periphery of the rising portion of each sleeve 46 is formed. Are provided with annular second protrusions 47, 47,..., Respectively.

  Here, when the optical element support member 38 is used on the light emitting substrate 6 side, the inner diameter of each sleeve 46 is set to be the same as or slightly smaller than the outer diameter of each of the light emitting elements 4 and 5. Further, when the optical element support member 38 is used on the light receiving substrate part 10 side, the inner diameter of each sleeve 46 is set to be the same as or slightly smaller than the outer diameter of each of the light receiving elements 8 and 9. That is, a maximum of three light emitting elements or a maximum of three light receiving elements can be press-fitted and supported to the optical element support member 38 by utilizing its elasticity. Incidentally, an arbitrary number of the respective sleeves 46 can be set according to the number of light emitting elements and light receiving elements to be used.

  The optical element support member 38 is formed with a window plate support frame 48 rising from the packing portion 43 so as to surround each through hole 44 on the front side. The window plate support frame 48 is set to have a shape and depth capable of fitting the window plate 22, and is inserted into the through window 35 in a state where the window plate 22 is fitted. Further, a third ridge 49 is provided on the peripheral side of the packing portion 43 on the back side, and a fourth ridge 50 is provided on the front side.

  Next, the pressing member 40 will be described with reference to FIGS. 6 is a front view of the pressing member 40 as viewed from the side facing the measurement cell 2, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6, and FIG. FIG.

The pressing member 40 is fixed in a state where the optical element support member 38 is pressed to the measurement cell 2 side when the optical element support member 38 fitted with the window plate 22 is attached to the measurement cell 2. It is a case-like member for doing. The front side of the pressing member 40 shown in FIG. 6 is a smooth surface, and is provided with sleeve insertion holes 51, 51,... For inserting the sleeves 46, respectively. Each of these sleeve insertion holes 51 penetrates toward the back side of the pressing member 40.

  The inner diameter of each sleeve insertion hole 51 is set to be the same as or slightly larger than the outer diameter of each sleeve 46 from the opening surface on the front side to a position A at a depth corresponding to the height of each sleeve 46. Has been. On the other hand, from the position A to the opening surface on the back side, the inner diameter of each sleeve 46 is set to be the same or slightly larger. That is, in a state where each sleeve 46 is inserted into each sleeve insertion hole 51, the outer peripheral surface and the front end surface of each sleeve 46 are tightly supported by the inner surface of each sleeve insertion hole 51.

  On the front side of the pressing member 40, second through holes 52, 52,... Are respectively provided at positions corresponding to the first through holes 41, and pins are provided at positions corresponding to the pin insertion holes 42. 53 and 53 are provided, respectively. Furthermore, on the back side of the pressing member 40, there are provided substrate support portions 54 and 54 for supporting the light emitting circuit board 3 or the light receiving circuit board 7 and fixing them by screws.

  Here, the assembled state of the measurement unit 1 will be described with reference to FIGS. 9 is a longitudinal sectional view of the measuring unit 1, and FIG. 10 is a sectional view taken along line XX of FIG.

  First, each of the window plates 22 is fitted and supported in the window plate support frame 48 of the optical element support member 38. In the optical element support member 38 on which the window plate 22 is supported, the outer peripheral surface of the window plate support frame 48 abuts on the tapered surface 35, and the front side peripheral surface of the packing portion 43 is the surface of the stepped portion 39. It is attached to the optical member mounting portion 34 so as to come into contact with. That is, each window plate 22 is supported in a state of being sandwiched between the window plate support portion 37 and the packing portion 43.

  Next, the pressing member 40 inserts the sleeves 46 into the sleeve insertion holes 51 and inserts the pins 53 into the pin insertion holes 42, respectively. It is attached to. The pressing members 40 facing each other across the measurement cell 2 are fastened by bolts 57 via the first through holes 41 and the second through holes 52. Here, one of the pressing members 40 is connected to the bolt 57, and an insert nut 58 is embedded in each of the second through holes 52.

  In the state in which each window plate 22, each optical element support member 38, and each pressing member 40 are mounted on the optical member mounting portion 34 and are supported and fixed, each pin 53 and each pin insertion hole. The axial centers of the sleeves 46 facing each other are positioned coaxially by 42. That is, the axial cores of the sleeves 46 facing each other are mounted so as to be located on the same plane orthogonal to the axial core of the measurement cell 2. Further, in this state, the first protrusions 45 abut against the surface of the window plate 22, the fourth protrusions 50 abut against the surface of the step part 39, and the second protrusions When the portion 47 and the third protrusion 49 are brought into contact with the front surface of the pressing member 40, the window plate 22, the optical element support member 38, and the pressing member 40 are in close contact with each other, so that their positional deviations occur. Is effectively prevented.

  Now, attachment of the light emitting substrate portion 6 and the light receiving substrate portion 10 will be described. First, a third light emitting element 55 is mounted on the light emitting circuit board 3 together with the first light emitting element 4 and the second light emitting element 5. The third light-emitting element 55 is normally set to a light emission wavelength different from that of the first light-emitting element 4 and the second light-emitting element 5. For example, each of the light-emitting elements 4, 5, and 55 includes a red LED and a green LED, respectively. Blue LEDs are used. By comprising in this way, a desired light emission wavelength can be selectively used according to the hue before the reaction of the pigment | dye contained in the coloring reagent, and the hue after reaction.

  Each of the light emitting elements 4, 5, 55 faces one side of the optical element support member 38 and is inserted into each sleeve 46. Then, the light emitting circuit board 3 is fixed to the pressing member 40 by coupling the light emitting circuit board 3 with the board supporting part 54 with the screw 17. In this state, the outer peripheral surfaces of the respective light emitting elements 4, 5, 55 are supported in close contact with the inner peripheral surfaces of the respective sleeves 46. That is, the optical path portion from each of the light emitting elements 4, 5, 55 to the window plate 22 is kept in an airtight state, and outside air including moisture and dust flows into the optical path portion, or irregularly reflected light enters. It is suppressed. As a result, dew condensation water and dust are prevented from adhering to the light transmitting window 13 on the light emitting side and the light emitting elements 4, 5 and 55, and stray light is prevented from being generated in the optical path portion.

  Next, a third light receiving element 56 is mounted on the light receiving circuit board 7 together with the first light receiving element 8 and the second light receiving element 9. The light receiving elements 8, 9, and 56 detect the transmitted light intensity of the light emitted from the light emitting elements 4, 5, and 55, respectively.

  Each of the light receiving elements 8, 9, 56 faces the other side of the optical element support member 38 and is inserted into each sleeve 46. Then, the light receiving substrate portion 10 is fixed to the pressing member 40 by coupling the light receiving circuit substrate 7 with the substrate support portion 54 with screws 17. In this state, the outer peripheral surfaces of the light receiving elements 8, 9, and 56 are supported in close contact with the inner peripheral surfaces of the sleeves 46, respectively. That is, the optical path portion from the window plate 22 to each of the light receiving elements 8, 9, and 56 is kept in an airtight state, and outside air including moisture and dust flows into the optical path portion, or irregularly reflected light enters. It is suppressed. As a result, dew condensation water and dust are prevented from adhering to the light transmission window 13 on the light receiving side and the light receiving elements 8, 9, and 56, and stray light is prevented from being generated in the optical path portion.

  Here, in a state in which the light emitting substrate portion 6 and the light receiving substrate portion 10 are attached, the respective axis cores of the first light emitting element 4 and the first light receiving element 8 are the same orthogonal to the axis core of the measurement cell 2. The axis of the second light emitting element 5 and the second light receiving element 9 are positioned on the same plane perpendicular to the axis of the measurement cell 2, and the third light emitting element 55 And the third light receiving element 56 is mounted so that the axial centers of the third light receiving elements 56 are positioned on the same plane perpendicular to the axial center of the measurement cell 2. That is, since the axial cores of the respective sleeves 46 facing each other are mounted so as to be located on the same plane orthogonal to the axial core of the measurement cell 2, each axial core of the corresponding pair of light emitting elements and light receiving elements. Are positioned so as to be located on the same plane orthogonal to the axis of the measurement cell 2. Therefore, not only when measuring the transmitted light intensity as in this embodiment but also when measuring the scattered light intensity, it is possible to effectively prevent the deviation of the optical axis.

  As described above, according to the present invention, it is possible to prevent adhesion of condensed water and dust to the light transmission window portion, the light emitting element, and the light receiving element, or generation of stray light in the optical path portion with a simple configuration. In addition, the optical axis can be prevented from being displaced with a simple configuration. As a result, the predetermined measurement accuracy in the optical measurement device can be continuously maintained.

The schematic block diagram of the optical measuring device which concerns on this invention. The side view of the measurement cell seen from the mounting side of the light transmission window part. The front view of an optical element support member. IV-IV sectional view taken on the line of FIG. The rear view of an optical element support member. The front view of a pressing member. VII-VII sectional view taken on the line of FIG. The rear view of a pressing member. The longitudinal cross-sectional view which shows the assembly state of a measurement part. XX sectional drawing of FIG. The longitudinal cross-sectional view which shows the structure of the measurement part in the conventional optical measuring device. XII-XII sectional view taken on the line of FIG.

Explanation of symbols

4 1st light emitting element 5 2nd light emitting element 8 1st light receiving element 9 2nd light receiving element 13 Light transmission window part 38 Optical element support member 46 Sleeve 55 3rd light emitting element 56 3rd light receiving element

Claims (3)

An optical measuring device in which a light emitting element and a light receiving element are arranged outside a measurement cell having a light transmission window,
An optical element support member in which a cylindrical sleeve is formed in the optical path portion is attached to the outside of the light transmission window on the light emitting side and the light receiving side, respectively.
An optical measuring device, wherein the light emitting element and the light receiving element are mounted in the sleeve.   2. The optical device according to claim 1, wherein the optical element support member is mounted so that each axis of the light emitting element and the light receiving element is positioned on the same plane perpendicular to the axis of the measurement cell. measuring device.   The optical measuring device according to claim 1, wherein the optical element support member is made of an elastic material.

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