JP2014081280A - Colorimeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an influence of deviation of light emission points of a light-emitting part for chromaticity measurement and a light-emitting part for turbidity measurement with a simplified configuration of an optical system, in a configuration where the light-emitting part for chromaticity measurement and the light-emitting part for turbidity measurement are juxtaposed relative to a light incidence window.SOLUTION: A colorimeter includes: a measurement cell 2 having a light incidence window part 2m and a light emission window part 2n; a light-emitting part 3 for chromaticity measurement which irradiates the inside of the measurement cell 2 with light for chromaticity measurement via the light incidence window part 2m; a light-emitting part 4 for turbidity measurement which irradiates the inside of the measurement cell 2 with light for turbidity measurement via the light incidence window part 2m; and a light detection part 5 which detects light transmitted through the measurement cell 2 via the light emission window part 2n. The light-emitting part 3 for chromaticity measurement and the light-emitting part 4 for turbidity measurement are juxtaposed so as to face the light incidence window part 2m, and a contour shape on the outside or the inside of the cell of a cross-section in an arrangement direction of two light-emitting parts, of the light incidence window part 2m or the light emission window part 2n is a convexly curved uniform cross-section.

Description

  The present invention relates to a chromaticity meter.

  As a conventional chromaticity meter, as shown in Patent Document 1, a measurement cell containing measurement water is provided with a light entrance window and a light exit window facing each other, and a chromaticity measurement LED and There is a configuration in which turbidity measuring LEDs are provided and light from the LEDs is incident on the measurement cell through a light entrance window by a beam splitter.

  However, since the beam splitter is provided between the LED for chromaticity measurement and the LED for turbidity measurement and the measurement cell, it is not only costly but also a factor that hinders downsizing of the chromaticity meter. Become. Moreover, it is necessary to arrange the LED for chromaticity measurement and the LED for turbidity measurement with respect to the beam splitter so that the angle formed by their optical axes is a right angle, and the adjustment of the optical axis is troublesome. Moreover, the number of attachment parts for attaching them increases, and cost and work man-hours will increase.

  In addition, it is conceivable to arrange a chromaticity measurement LED and a turbidity measurement LED side by side with respect to the light incident window without using a beam splitter. The light emission point of the LED for measuring the degree of color shifts, resulting in a measurement error in chromaticity measurement or turbidity measurement.

JP 2012-168044 A

  Therefore, the present invention has been made to solve the above-mentioned problems all at once, reducing the number of parts, enabling assembly man-hours, cost reduction and downsizing of the optical system, and further for chromaticity measurement and turbidity measurement. Reducing the influence of the deviation of the light emission point of the light emitting part for the purpose is a main intended problem.

  That is, the chromaticity meter according to the present invention is a chromaticity meter that irradiates a sample liquid with light and calculates the absorbance thereof, and measures the chromaticity of the sample liquid, and is a light incident window arranged facing each other. A measuring cell having a light emitting window and a light emitting window, a light emitting part for chromaticity measurement that irradiates light in the wavelength band for chromaticity measurement through the light incident window, and the light incident window. A turbidity measuring light emitting part for irradiating light in the wavelength band for turbidity measurement through the light source, and a light detecting part for detecting light transmitted through the measuring cell through the light exit window part, A chromaticity measuring light emitting unit, a turbidity measuring light emitting unit, and a collimating lens that collimates the light from each light emitting unit provided between the light incident window unit and the chromaticity measurement. The light emitting part for turbidity and the light emitting part for turbidity measurement are provided side by side facing the light incident window part. The cross-sectional shape of the cross section along the arrangement direction of the two light emitting sections in the light entrance window section or the light exit window section is an equicross section shape in which the contour shape of the cell inside or inside the cell is curved in a convex shape, and the chromaticity measurement The light of the light emitting part for turbidity and the light of the light emitting part for turbidity measurement are converted into parallel light by the collimator lens, and the light of the light emitting part for chromaticity measurement or the light of the light emitting part for turbidity measurement which is the parallel light, The light is refracted toward the light detection portion by either one of the light incident window portion, the light emission window portion, or a combination thereof.

In such a case, the chromaticity measuring light emitting part and the turbidity measuring light emitting part are arranged side by side facing the light incident window part, so that a beam splitter is unnecessary and the number of parts is reduced. In addition, assembly man-hours and costs can be reduced, and the optical system can be miniaturized.
In addition, when the light incident window part is provided with the light emitting part for chromaticity measurement and the light emitting part for turbidity measurement, the light emission point of each light emitting part is shifted from the detection optical axis of the light detection part, and chromaticity measurement or turbidity is detected. Measurement error of the degree measurement. In this regard, in the present invention, since the contour shape outside the cell or inside the cell of the cross section of the light entrance window portion or the light exit window portion is curved in a convex shape and functions as a condensing lens, chromaticity The light emitted from the measurement light-emitting unit and the light from the turbidity measurement light-emitting unit can be collected on the light detection unit. It is possible to reduce the influence of.
Furthermore, since the collimating lens is provided between the light emitting part for chromaticity measurement and the light emitting part for turbidity measurement and the light incident window part, the collimated lens is used as the parallel light, so that the parallel light passes through the light incident window part and the light emitting window part. Even if it passes, the parallelism in the arrangement direction remains maintained, and the light can reach the light detection unit without loss of light quantity.

An exit-side condensing lens is provided between the light exit window and the light detector, and the light refracted by either the light entrance window, the light exit window, or a combination thereof is used. It is desirable that the light is collected by the emission side condensing lens and reaches the light detection unit.
If this is the case, the light refracted by either the light incident window portion or the light exit window portion or a combination thereof is condensed on the light detection portion by the exit side condensing lens, so that the light amount loss is further reduced. The light can be reduced and reach the light detection unit.

The measurement cell has a substantially cylindrical shape made of a translucent member, and the light incident window portion and the light emission window portion are integrally formed. The light emitting portion for chromaticity measurement and the turbidity measurement It is desirable that the light emitting units are provided side by side along a direction orthogonal to the central axis of the measurement cell.
If this is the case, the configuration of the measurement cell can be greatly simplified, and both the light incident window portion and the light emission window portion are convexly curved. It is possible to improve the light collection performance of the light from the light measuring unit for measuring the degree of light.

A cleaning body provided in the measurement cell and contacting and cleaning the inner peripheral surface of the measurement cell; and a moving mechanism for rotating the cleaning body along the inner peripheral surface. A cleaning element that contacts the inner peripheral surface of the measurement cell; and a holding member that holds the cleaning element. The moving mechanism rotates the holding member to measure the cleaning element. It is desirable to move along the inner peripheral surface of the cell.
If this is the case, since the inner peripheral surface of the measurement cell has a circular cross section without a step and a gap, the cleaning element can be smoothly slid when the cleaning element is rotated along the inner peripheral surface. And the wear or scraping of the cleaning element can be reduced. Furthermore, since there are no steps and gaps on the inner peripheral surface of the measurement cell, it is difficult to get dirty.

The chromaticity measurement light emitting unit and the turbidity measurement light emitting unit are mounted, and the mount unit is moved with respect to the measurement cell, thereby moving the light incident window unit from each light emitting unit. It is desirable to provide an incident angle adjusting mechanism for adjusting the incident angle of light.
In this case, by adjusting the incident angle of the light from each light emitting portion with respect to the light incident window portion, the light amount of the chromaticity measuring light emitting portion detected by the light detecting portion and the light of the turbidity measuring light emitting portion are detected. The amount of light can be adjusted. Therefore, it is possible to eliminate variations in the detected light amount between the light of the chromaticity measuring light emitting unit and the light of the turbidity measuring light emitting unit due to the detection sensitivity characteristic of the light detecting unit.

  According to the present invention configured as described above, a beam splitter is unnecessary, the number of parts can be reduced, the number of assembling steps and costs can be reduced, and the optical system can be further downsized. In addition, light from the chromaticity measurement light-emitting unit and light from the turbidity measurement light-emitting unit can be collected by the measurement cell, so the effect of deviation of the light emission point of each light-emitting unit is reduced and corrected by turbidity. The measurement accuracy of the measured chromaticity can be improved.

The schematic diagram which shows the system configuration | structure of the chromaticity meter of this embodiment. The longitudinal cross-sectional view which shows typically the structure of the measurement cell of the same embodiment, and its periphery. The cross-sectional view which shows typically the structure of the measurement cell of the embodiment, and its periphery. The schematic diagram which shows the optical path of each light emission part in the chromaticity meter of the embodiment. The figure which shows the modification of a light-incidence window part and a light-projection window part.

  A chromaticity meter according to the present invention will be described below with reference to the drawings.

  The chromaticity meter 100 of the present embodiment measures the chromaticity of the sample liquid by, for example, irradiating the sample liquid such as tap water generated by the water purification treatment process with light to calculate the absorbance.

  Specifically, as shown in FIG. 1, the chromaticity meter 100 includes a measuring cell 2 having an inlet 2a for introducing a sample liquid and an outlet 2b for discharging the sample liquid, and a sample connected to the inlet 2a. A liquid supply line L1 and a sample liquid discharge line L2 connected to the discharge port 2b are provided.

  The sample liquid supply line L1 is provided with a connection port P1 connected to an external pipe (not shown) at the upstream end. And the filter line L11 branched from the sample solution supply line L1 in the downstream of the connection port P1 and provided with a filter F such as an activated carbon filter is provided. The downstream side of the filter line L11 merges with the sample liquid supply line L1, and a three-way solenoid valve V is provided at the junction. Further, on the downstream side of the three-way solenoid valve V, a bypass line L3 that bypasses the measurement cell 2 and is connected to the sample liquid discharge line L2 is provided. When performing chromaticity zero calibration, the three-way solenoid valve V is switched, and the sample liquid is filtered by the filter F and supplied to the measurement cell 2 as water having zero chromaticity. The sample solution supply line L1 is connected to a calibration solution supply line L4 for supplying a calibration solution for span calibration to the measurement cell 2.

  The sample liquid discharge line L2 is provided with a drain port P2 at the downstream end. The opening degree of the drain port P2 is adjusted in the flow measurement of the sample liquid. Thereby, the replacement speed of the sample liquid in the measurement cell 2 is adjusted.

  And the measurement cell 2 of this embodiment has the light-incidence window part 2m and the light-projection window part 2n arrange | positioned facing each other, as shown in FIG.2 and FIG.3. Specifically, the measurement cell 2 has a substantially cylindrical shape made of a translucent member, and the light incident window 2m and the light exit window 2n are integrally formed. In detail, as shown in FIG. 3, the measurement cell 2 includes a cylindrical member 21 made of a translucent member having openings at both ends, and blocking members 22 and 23 that close the openings at both ends of the cylindrical member 21. Yes. The cylindrical member 21 of this embodiment is comprised from the glass tube.

  The measurement cell 2 configured as described above is arranged so that the central axis of the cylindrical member 21 faces in the horizontal direction, and the one closing member 22 that closes one end opening of the cylindrical member 21 includes the introduction port. 2a and the discharge port 2b are formed. In the one closing member 22, the introduction port 2a is formed in a portion corresponding to the lower end portion of the cell space 2S, and the discharge port 2b is formed in a portion corresponding to the upper end portion of the cell space 2S (FIG. 2). reference). The cylindrical member 21 constituting the measurement cell 2 accommodates a cleaning body 11 to be described later and has a size such as an inner diameter that allows the cleaning body 11 to rotate in the cell space 2S, and has an inner diameter of, for example, about 100 mm. .

  Further, a light emitting part 3 for chromaticity measurement and a light emitting part 4 for turbidity measurement are provided on the light incident window 2m side of the measuring cell 2, and on the light emitting window 2n side of the measuring cell 2. A light detection unit 5 is provided. That is, the chromaticity measuring light emitting unit 3 and the turbidity measuring light emitting unit 4 and the light detecting unit 5 are arranged to face each other in a direction orthogonal to the central axis of the cylindrical member 21 in the horizontal plane.

  The chromaticity measurement light emitting unit 3 irradiates the measurement cell 2 with light in the wavelength band for chromaticity measurement through the light incident window 2m. The light emission part 3 for chromaticity measurement of this embodiment is an LED element having a peak wavelength of 390 nm or its vicinity (hereinafter referred to as “LED element 3 for chromaticity measurement”).

  The turbidity measurement light emitting unit 4 irradiates the measurement cell 2 with light in the wavelength band for turbidity measurement through the light incident window 2m. The turbidity measuring light emitting unit 4 of the present embodiment is an LED element having a peak wavelength of 660 nm or its vicinity (hereinafter referred to as a turbidity measuring LED element 4). Between the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement and the light incident window 2m, a slit S1 and an incident side condensing lens 7 are provided from the light emitting parts 3 and 4 side. In order. The incident-side condenser lens 7 is a collimating lens that collimates the light from the LED elements 3 and 4.

  The light detection unit 5 detects light transmitted through the measurement cell 2 through the light exit window 2n. The light detection unit 5 of the present embodiment is a single photodetector having detection sensitivity of a predetermined level or higher for both the light in the wavelength band for chromaticity measurement and the light in the wavelength band for turbidity measurement. In addition, between the light detection part 5 and the light emission window part 2n, the emission side condensing lens 8 and the slit S2 are provided in this order from the light emission window part 2n side.

  The computing unit (not shown) that has acquired the light intensity signal output by the photodetector 5 calculates chromaticity using the following (Equation 1). That is, the calculation unit calculates the absorbance Abs (390 nm) of the sample liquid from the light intensity signal obtained when the chromaticity measurement LED element 3 is turned on, and when the turbidity measurement LED element 4 is turned on. The absorbance Abs (660 nm) of the sample liquid is calculated from the obtained light intensity signal, and the chromaticity subjected to turbidity correction is calculated.

Chromaticity = α × (Abs (390 nm) −β × Abs (660 nm)) (Equation 1)
α: a coefficient for converting from absorbance at 390 nm to chromaticity, and a constant determined by wavelength and cell length.
β: a coefficient for adjusting the degree of influence of absorbance at 660 nm.

  The LED elements 3 for chromaticity measurement and the LED elements 4 for turbidity measurement are packaged LEDs 6 that are mounted on a single chip. In addition to the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement, the package LED 6 is provided with a detection element for detecting light from the LED elements 3 and 4 and using it as reference light. It has been. The package LED 6 has a condensing lens integrally provided on the light emitting side of the LED elements 3 and 4.

  By disposing the package LED 6 configured in this manner so as to oppose the light incident window 2m of the measurement cell 2, the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement are arranged in the light incident window 2m. It will be provided side by side facing each other.

  At this time, the optical axis of the chromaticity measurement LED element 3 and the turbidity measurement LED element 4 which are parallel to each other are arranged so as to sandwich the optical axis of the incident-side condenser lens 7. In addition, the package LED 6 has a light incident window so that the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement are arranged in a direction perpendicular to the central axis of the cylindrical member 21 of the measurement cell 2, that is, in the vertical direction. It arrange | positions facing the part 2m.

  By arranging the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement in this way, the arrangement direction (vertical direction) of the two LED elements 3 and 4 in the light incident window portion 2m and the light emission window portion 2n. The contour shape outside the cell in the longitudinal section along the line is an equal sectional shape curved in a convex shape. That is, with respect to the two LED elements 3 and 4 arranged vertically, the light incident window portion 2m and the light exit window portion 2n function as a condensing lens having an equal cross-sectional shape in the vertical direction. 4 is condensed on the light detection unit 5 side. That is, the light incident window 2m and the light exit window 2n are lenses in the front-rear direction, that is, in a direction perpendicular to the plane along the arrangement direction of the two LED elements 3 and 4 (the central axis direction of the measurement cell 2). The function of the lens is exhibited in the vertical direction, that is, in the arrangement direction of the two LED elements 3 and 4. The light emitted from the LED elements 3 and 4 is converted into parallel light by the incident-side condenser lens 7, and the parallel light is vertically converted by the light incident window 2m and the light exit window 2n. The collimated light reaches the exit-side condensing lens 8 while maintaining the parallel light in the direction, and is condensed on the light detection unit 5 by the exit-side condensing lens 8.

Next, the condensing function by the light entrance window 2m and the light exit window 2n will be described in detail with reference to FIG.
By disposing the package LED 6 as described above, the optical axis of the chromaticity measuring LED element 3 is shifted downward with respect to the optical axis of the incident-side condenser lens 7. The light emitted from 3 is condensed by the incident side condensing lens 7 and condensed above the optical axis of the incident side condensing lens 7 (see the dotted line in FIG. 5). On the other hand, since the optical axis of the turbidity measuring LED element 4 is shifted upward with respect to the optical axis of the incident-side condenser lens 7, the light emitted from the turbidity measuring LED element 4 is incident on the incident side. The light is condensed by the condenser lens 7 and condensed below the optical axis of the incident side condenser lens 7 (see the dotted line in FIG. 5). In addition, the dotted line of FIG. 5 has shown the optical path when there is no measurement cell 2 (when not passing through the measurement cell 2).

  Here, the light incident window portion 2m and the light exit window portion 2n of the cylindrical member 21 of the measurement cell 2 act as convex lenses, and are used for measuring chromaticity that is condensed below the optical axis of the incident-side condensing lens 7. Is refracted to the optical axis side of the incident side condensing lens 7 (detection optical axis side of the light detection unit 5) (see the one-dot chain line in FIG. 5), and more than the optical axis of the incident side condensing lens 7 The turbidity measuring light condensed on the upper side is refracted to the optical axis side of the incident side condensing lens 7 (detection optical axis side of the light detection unit 5) (see the two-dot chain line in FIG. 5). Accordingly, the light for chromaticity measurement and the light for turbidity measurement are refracted toward the light detection unit 5 and are received by the light detection unit 5.

  Further, the light detection unit 5 has spectral sensitivity characteristics, and even if the light amount for chromaticity measurement and the light for turbidity measurement received by the light detection unit 5 are the same, the light detection unit 5 The light intensity signal amount output by 5 differs. For this reason, in this embodiment, it is comprised so that adjustment of the light quantity of the light for chromaticity measurement received by the photon detection part 5 and the light for turbidity measurement is possible.

  That is, the chromaticity meter 100 according to the present embodiment is mounted on the measurement cell 2 and the mount portion 9 on which the chromaticity measurement LED element 3 and the turbidity measurement LED element 4 are mounted, as shown in FIG. An incident angle adjusting mechanism 13 that adjusts the incident angle of light from the LED elements 3 and 4 with respect to the light incident window 2m by moving the unit 9 is provided.

  Since the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement of the present embodiment are configured by one package LED 6, the package LED 6 is mounted on the mount portion 9. The mount portion 9 is attached to an outer wall member 10 that is provided apart from the outer peripheral surface of the cylindrical member 21. The outer wall member 10 has a substantially cylindrical shape, and is provided between the closing members 22 and 23 that close the opening at both ends of the cylindrical member 21, and the opening at both ends is closed.

  In the side wall portion of the outer wall member 10, an opening 101 is formed in a portion facing the light incident window 2m, and the mount 9 is attached to the opening 101. Specifically, the incident side condensing lens 7 and the mount 9 are attached to the opening 101 in this order from the light incident window 2m side in this order. Note that an opening 102 is also formed in a portion of the side wall portion of the outer wall member 10 that faces the light exit window 2n, and the opening 102 has an exit side condensing from the light exit window 2n side. The lens 8 and the light detection unit 5 are attached by a fixture in this order.

  The incident angle adjusting mechanism 13 adjusts the incident angle of the optical axis of the chromaticity measuring LED element 3 and the optical axis of the turbidity measuring LED element 4 with respect to the light incident window 2m. The incident angle adjusting mechanism 13 is provided between the mount 9 and the outer wall member 10 or the mounting tool. In the present embodiment, the incident angle adjusting mechanism 13 is provided for the outer wall member 10 or the mounting tool. And a plurality of mounting screws 131 that allow the mounting angle of the mount portion 9 to be adjusted. The plurality of mounting screws 131 includes a screw that pulls the mount portion 9 with respect to the outer wall member 10 or the mounting tool and a screw that pulls the mounting portion 9. Specifically, the incident angle adjusting mechanism 13 is configured so that the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement are arranged in the arrangement direction (vertical direction) by a tensioning screw and a pulling screw in the plurality of mounting screws 131. It is configured to adjust the incident angle of those optical axes with respect to the light incident window portion 2m by rotating in a plane including the same.

  In addition, the chromaticity meter 100 of the present embodiment has an automatic cleaning function. As shown in FIGS. 2 and 3, the chromaticity meter 100 is provided in the measurement cell 2 and contacts the inner peripheral surface 2 x for cleaning. A cleaning body 11 that moves, a moving mechanism 12 that rotates the cleaning body 11 along the inner peripheral surface 2x, and a cleaning control unit (not shown) that controls the moving mechanism 12 to activate an automatic cleaning function. ing.

  The cleaning body 11 holds two cleaning body elements 111a and 111b for contact with two opposing surfaces facing the radial direction of the measurement cell 2 for friction cleaning, and the two cleaning body elements 111a and 111b. Holding member 112.

  The cleaning element elements 111a and 111b have a rod shape formed of an elastic member such as silicon rubber. The cleaning body elements 111a and 111b have such a length as to come into contact with the entire predetermined range including the light incident window portion 2m and the light emission window portion 2n of the measurement cell 2 in accordance with the rotational movement by the moving mechanism 12 described later. Is.

  The holding member 112 has a substantially U-shape, and is provided in the measurement cell 2 so that opposing sides 112 a and 112 b face the inner peripheral surface 2 x of the measurement cell 2. And the said cleaning body element 111a, 111b is provided in the opposing edge part 112a, 112b of the holding member 112 so that attachment or detachment is possible. In this embodiment, slide grooves 113a are formed in the opposing side portions 112a and 112b along the extending direction, and the slide grooves 113a can be slid into the cleaning body elements 111a and 111b along the extending direction. The slide insert portion 113b is formed, and the cleaning groove elements 111a and 111b are configured to be detachable from the holding member 112 by the slide groove 113a and the slide insert portion 113b. Alternatively, the slide groove 113a may be formed in the cleaning body elements 111a and 111b, and the slide insertion portion 113b may be formed in the opposing side portions 112a and 112b of the holding member 112. Further, the connecting side portion 112 c between the facing side portions 112 a and 112 b in the holding member 112 is provided to face the one closing member 22.

  The moving mechanism 12 moves the two cleaning body elements 111 a and 111 b along the inner peripheral surface 2 x of the measurement cell 2 by rotating the holding member 112. The rotation center axis of the holding member 112 rotated by the moving mechanism 12 and the center axis of the cylindrical member 21 of the measurement cell 2 substantially coincide with each other. A specific configuration of the moving mechanism 12 is to connect an electric motor 121 such as a stepping motor provided outside the one closing member 22, a drive shaft of the electric motor 121, and a connecting side portion 112 c of the holding member 112. Connecting shaft 122. A shaft seal member 123 is provided between the connecting shaft 122 and the shaft insertion hole of the one closing member 22. Here, since the shaft seal member 123 is provided between the connection shaft 122 and the shaft insertion hole of the one closing member 22, and the connection shaft 122 is disposed in the horizontal direction, the shaft insertion is temporarily performed. Even if the sample liquid leaks from the hole, the leaked sample liquid flows downward along the outer surface of the one closing member 22, so that the sample liquid can be prevented from reaching the electric motor 121. Further, the connecting shaft 122 is provided with a rotational position detection mechanism 124 such as a photo sensor for detecting the rotational position of the motor 121 and determining the positions of the cleaning body elements 111a and 111b in the measurement cell 2. Yes. Then, the moving mechanism 12 uses the rotational position detection mechanism 124 to rotate and move the cleaning elements 111a and 111b after the automatic cleaning to the retracted positions that do not interfere with the chromaticity measurement.

  Here, the rotational position detection mechanism 124 may be configured to make a determination using a light intensity signal from the light detection unit 5 without using a component such as a photosensor. For example, when the light intensity signal from the light detection unit 5 reaches the minimum value, the moving mechanism 12 is in a position where the cleaning body elements 111a and 111b are in contact with the light incident window 2m and the light emission window 2n. It can be considered that the number of pulses input to the stepping motor 121 from that position is controlled and rotated to the retracted position.

  Further, in the present embodiment, the other closing member 23 not provided with the moving mechanism 12 has a visual window member 231 that enables the inside of the measurement cell 2 to be visually recognized. The visual window member 231 is made of a transparent resin that is detachably provided on the other closing member 23. In this embodiment, it is comprised so that attachment or detachment is possible by screwing the external thread part formed in the visual recognition window member 231 to the internal thread part formed in the part in which the visual recognition window member 231 in the other closure member 23 is mounted | worn. Yes.

  According to the chromaticity meter 100 according to the present embodiment configured as described above, the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement are provided side by side facing the light incident window portion 2m. A splitter is not required, the number of parts can be reduced, the number of assembling steps and costs can be reduced, and the optical system can be miniaturized. Here, since the LED element 3 for chromaticity measurement and the LED element 4 for turbidity measurement are constituted by the package LED 6, the mounting operation can be simplified and the optical system can be further miniaturized. it can. Further, the LED elements 3 and 4 can be arranged as close as possible.

  Further, the light incident window 2m and the light exit window 2n function as convex lenses, and the light from the LED elements 3 and 4 is condensed on the light detector 5 side, so that the chromaticity measurement is performed on the light incident window 2m. It is possible to reduce the influence caused by the deviation of the light emission point that occurs when the LED element 3 for turbidity and the LED element 4 for turbidity measurement are provided side by side.

  The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the measurement cell 2 is a substantially cylindrical glass tube, and the vertical cross-sections of both the light incident window 2m and the light exit window 2n are curved in a convex shape on the outside of the cell. Although it has a cross-sectional shape, the light for chromaticity measurement and the light for turbidity measurement that have passed through the measurement cell 2 are condensed toward the light detection unit 5 by the measurement cell 2. If it is, it can be set as various shapes. An example is shown in FIG. FIG. 5A shows a case in which the contour shape outside the cell in the longitudinal section of the light incident window 2m or the light exit window 2n is curved in a convex shape, and FIG. 5A shows the light incident window 2m or the light. The contour shape inside the cell in the longitudinal section of the exit window 2n is curved in a convex shape, and (c) shows the contour outside the cell and inside the cell in the longitudinal section of the light entrance window 2m or the light exit window 2n. The shape is curved in a convex shape.

  In addition, when either one of the light incident window 2m or the light exit window 2n is caused to function as a convex lens, it is desirable that the light incident window 2m be allowed to function as a convex lens. Thereby, it can be refracted to the optical axis side when the deviation amount of the light collected by the incident side condensing lens 7 with respect to the optical axis of the incident side condensing lens 7 is small, and the light detecting unit 5 can be sufficiently refracted. Light can be received. On the other hand, when only the light exit window 2n is made to function as a convex lens, the amount of deviation of the light collected by the incident side condensing lens 7 with respect to the optical axis of the incident side condensing lens 7 becomes large, and the light Even if the light is refracted to the axial side, it may be difficult to cause the light detection unit 5 to receive the light sufficiently.

  Moreover, in the said embodiment, although the light emission part for chromaticity measurement and the light emission part for turbidity measurement are comprised by the LED element, it is set as package LED6, However, if each light emission part can be arrange | positioned closely, it will not be restricted to an LED element. . For example, you may comprise the light emission part for chromaticity measurement, and the light emission part for turbidity measurement by the light emission end surface of an optical fiber.

  Furthermore, in the said embodiment, the chromaticity light-received by the light detection part 5 is adjusted by adjusting the incident angle of the light from the light emission part 3 for chromaticity measurement with respect to the light incident window part 2m, and the light emission part 4 for turbidity measurement. The amount of light for measurement and the amount of light for turbidity measurement can be adjusted, but the amount of light can be adjusted by adjusting the inclination angle of the detection optical axis of the light detection unit 5 with respect to the light exit window 2n. You may comprise.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Chromaticity meter 2 ... Measurement cell 2m ... Light entrance window part 2n ... Light emission window part 3 ... Light emission part for chromaticity measurement (LED element for chromaticity measurement)
4 ... Light emitting part for turbidity measurement (LED element for turbidity measurement)
5 ... Photodetector 9 ... Mount 11 ... Cleaning element 12 ... Moving mechanism 111a, 111b ... Cleaning element 112 ... Holding member

Claims (5)

A chromaticity meter that irradiates a sample liquid with light and calculates its absorbance, and measures the chromaticity of the sample liquid,
A measuring cell having a light entrance window and a light exit window disposed opposite to each other;
A chromaticity measurement light emitting unit that irradiates light in the wavelength band for chromaticity measurement into the measurement cell through the light incident window unit;
A turbidity measuring light emitting unit that irradiates light in the wavelength band for turbidity measurement into the measurement cell through the light incident window,
A light detection unit that detects light transmitted through the measurement cell through the light exit window;
A collimating lens provided between the light emitting part for chromaticity measurement and the light emitting part for turbidity measurement and the light incident window part, and collimating the light from each light emitting part;
The chromaticity measuring light emitting unit and the turbidity measuring light emitting unit are provided side by side facing the light incident window portion,
The contour shape of the cell outer side or the cell inner side of the cross section along the arrangement direction of the two light emitting parts in the light incident window part or the light emitting window part is an equal sectional shape curved in a convex shape,
The light from the chromaticity measuring light emitting unit and the light from the turbidity measuring light emitting unit are converted into parallel light by the collimator lens, and the light from the chromaticity measuring light emitting unit or the turbidity measuring light emitting unit as the parallel light. The chromaticity meter is characterized in that the light is refracted toward the light detection portion by either one of the light incident window portion or the light emission window portion or a combination thereof. An exit-side condensing lens is provided between the light exit window and the light detector,
2. The chromaticity according to claim 1, wherein light refracted by any one of the light incident window part and the light emission window part or a combination thereof is condensed by the emission side condensing lens and reaches the light detection part. Total. The measurement cell has a substantially cylindrical shape made of a translucent member, and the light incident window and the light exit window are integrally formed,
The chromaticity meter according to claim 1 or 2, wherein the chromaticity measuring light emitting unit and the turbidity measuring light emitting unit are provided side by side along a direction orthogonal to a central axis of the measurement cell. A cleaning body provided in the measurement cell and cleaning by contacting an inner peripheral surface of the measurement cell;
A moving mechanism for rotating the cleaning body along the inner peripheral surface,
The cleaning body has a cleaning body element that contacts the inner peripheral surface of the measurement cell, and a holding member that holds the cleaning body element,
The chromaticity meter according to claim 3, wherein the moving mechanism moves the cleaning element along the inner peripheral surface of the measurement cell by rotating the holding member. A mount part on which the light emitting part for chromaticity measurement and the light emitting part for turbidity measurement are mounted;
5. An incident angle adjusting mechanism that adjusts an incident angle of light from each of the light emitting units with respect to the light incident window by moving the mount unit with respect to the measurement cell. The stated chromaticity meter.