Optical device

Abstract

To provide an optical device for detecting the transmitted light from a vessel having optical transparency, and a method for detecting such transmitted light.SOLUTION: In a spectral transmittance measurement device 1 including a light source part unit 7 including an LED, a light source and a light receiving part unit 8 including a PD (a photo-diode) arranged to face the LED of the light source part unit 7, a vessel H1 having optical transparency to the light source part unit 7 is vertically and reversely arranged in an arrangement area S so as to arrange the light source part unit 7 in the inside, and the light of the LED of the light source part unit 7 is emitted toward the outside from the inside and is detected by the PD on the side of the light receiving part unit 8.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an optical device for detecting transmitted light through a light-transmitting container, and a method for detecting such transmitted light. [Background technology]

[0002] When measuring the transmittance of an object, the transmittance is measured by detecting the transmitted light (measurement light) emitted from the light source that has passed through the object being measured using the detection unit. First, the light is detected and the amount of light is recorded with nothing placed between the light source and detection unit. Next, the object being measured is irradiated with light, and the transmitted light is detected and the amount of light is recorded. Then, the transmittance is generally calculated by dividing the amount of light transmitted through the object being measured by the amount of light that was initially recorded. However, when the object to be measured is, for example, a container made of a light-transmitting material, several measurement problems arise. Basically, in the case of a container, light is shone from the outside and the transmitted light is measured on the outside through at least two walls, resulting in a positional relationship between the light source and detector as shown in Figure 9. When measuring in this way, the light to be measured is attenuated as it passes through both the front and back glass surfaces. Furthermore, if the container is large and the front glass surface is far from the detector, the light scatters along the way, further reducing the amount of transmitted light to be measured. Furthermore, if the light-transmitting container is made of a material that easily scatters light, for example, if it is made of a cloudy, translucent material such as frosted glass, the light will be scattered by the glass surface, and the amount of transmitted light detected by the detection unit will be very small. In this case, if the container is large and the front glass surface is far from the detection unit, the light will be scattered along the way, and the amount of transmitted light detected will be even smaller. To solve these problems, a piece measuring a few centimeters square is cut out from the bottle-shaped container to be measured, and the transmittance of this piece is measured. However, because this requires destroying the object to be measured, this measurement method cannot be used when destruction is not acceptable. Even when destruction is acceptable, it is necessary to cut out the piece before measurement, which is time-consuming. Therefore, a technology such as that disclosed in Patent Document 1 can be used. The inspection device disclosed in Patent Document 1 uses a light projector 3A that irradiates light onto the area around the mouth of the container and a light receiver 3B that receives light transmitted through the container. By irradiating light obliquely from the area around the mouth of the container to the inside of the container in this way, there is only one glass surface through which the light passes, resulting in little attenuation. Even if the container is made of a material that scatters light, by placing light receiver 3B close to the glass surface, it is possible to detect all of the transmitted light. Furthermore, the transmitted light can be detected without destroying the object being measured. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-3406 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when measuring the transmittance of the side surface of a container body by irradiating light from a projector obliquely from the mouth of the container to the inside, as in Patent Document 1, the light irradiated from the projector does not directly face the container surface, and the angle of incidence is large, as shown in Figure 10, so much of the irradiated light is reflected by the inner surface of the container. As a result, the light receiver cannot detect a sufficient amount of transmitted light. Therefore, the means in Patent Document 1 cannot be considered a sufficient solution. Therefore, an optical device and a method for detecting transmitted light that solve the above problems have been desired. [Means for solving the problem]

[0005] In order to solve the above problem, the first means comprises a light source, a detection means arranged opposite the light source for detecting transmitted light from the light source, and a placement area for placing a light-transmitting container, wherein when the container is placed in the placement area, only either the light source or the detection means is housed within the container, and the transmitted light after the light irradiated from the light source passes through the container is detected by the detection means. This allows the light to be detected without being incident at an angle onto the wall surface when irradiating the measurement light onto a container made of a light-transmitting material, and the light can be detected by passing through only one wall surface of the container, thereby preventing light attenuation and scattering when detecting transmitted light. The "light source" may be, for example, a laser device that generates highly directional laser light, an LED, a halogen lamp, etc. When using a light source that diffuses light such as an LED or halogen lamp, it is advisable to arrange the optical system so that parallel light is emitted from the light source. The "detection means" may be, for example, a PD (photodiode), a line CCD, a photomultiplier, a spectroscope, etc. In particular, when using a spectroscope or a PD or photomultiplier with a small light-receiving area, an integrating sphere may be used to cause light scattered by the object to be measured to enter the integrating sphere, and the light emitted from the integrating sphere may be caused to enter the detection unit. Furthermore, when light is separated into wavelengths and detected for each wavelength, a line CCD is preferably used. When placing a container in the "placement area," it may be placed on a predetermined surface or may be suspended.

[0006] As a second means, the light source is protruded upward within the placement area, and the container is inverted with the opening facing downward and placed in the placement area to house the light source inside. As a third means, the detection means is protruded upward within the placement area, and the container is inverted with the opening facing downward and placed in the placement area to house the detection means inside. As a result, when the container is placed in the placement area upside down with the opening facing downwards, the wall surface of the container is automatically positioned between the light source and the detection means, thereby improving the efficiency of detection work. As a fourth means, a container holder for holding the container is disposed on the side of the placement area. This prevents the inverted container from falling over. There may be only one container holder, or multiple container holders may be arranged. Either the light source or the detection means, or both, may also serve as the container holder. As a fifth means, the container holder is movable in a direction approaching or moving away from the placement area. This allows the container holder to be positioned at an optimal position depending on the size of the container. The container holder may support the container by itself, or may support the container together with a housing that houses the light source and detection means. The container holder may move by itself, or may be configured to move together with a housing that houses the light source and detection means that are arranged outside the container. Furthermore, as a sixth means, when the container holding unit moves, the light source or the detection unit arranged outside the container is made capable of moving in a direction approaching or moving away from the placement area in synchronization with the container holding unit. This allows the light source or detection means to be placed outside the container to move synchronously when the container holder is changed in position according to the size of the container, eliminating the need to change the position according to the size of the container. Also, it makes it easy to support the container together with the housing that houses the light source or detection means by the container holder.

[0007] As a seventh means, the detecting means separates the light into wavelengths and detects the light for each wavelength. In this way, by detecting the dispersed wavelengths with the detecting means, it becomes possible to measure the transmittance for each wavelength more precisely. For example, each wavelength can be detected by a spectroscope. Furthermore, as an eighth means, a calculation means is provided for measuring the transmittance of the side surface of the container based on the transmitted light information. The calculation means may be a controller made up of a computer device including a CPU (Central Processing Unit), associated memories such as ROM and RAM, a timer, and the like.

[0008] Furthermore, as a ninth means, there is provided a method for detecting transmitted light, in which light is irradiated onto the side of a light-transmitting container and transmitted light is detected, in which either the light source or the detection means is disposed inside the container, and the other of the light source or the detection means is disposed outside the container, and the transmitted light after the light irradiated from the light source has passed through the container is detected by the detection means. This allows the light to be detected by passing through only one wall of the container without being incident at an angle to the wall when irradiating the container with measurement light, thereby preventing attenuation and scattering of light when detecting transmitted light. This is a claim made from a methodological point of view. As a tenth means, the container is turned upside down and placed in an inverted position so that the bottom side faces upward. By placing the container inverted so that it covers the installation surface, there is no need to hang the light source or detection means from above and place either one inside the container, and detection work can be performed by placing at least the light source or detection means placed inside the container on the ground surface, thereby improving work efficiency. As an eleventh means, the detecting means is disposed in contact with or in the vicinity of the side surface of the container to detect transmitted light. This allows the light passing through the container to be easily guided to the detection means without being scattered around. The inventions of the first to eleventh means described above can be combined in any way. For example, it is preferable to have the configuration of the first means and combine it with at least one of the configurations of the inventions of the second to eleventh means. Any component of the inventions of the first to eleventh means may be extracted and combined with other components. Furthermore, the descriptions that are given in an order are not limited to this order. Configurations in which some components are deleted or the order is changed are also disclosed, and it is the intention to obtain rights to them. [Effects of the Invention]

[0009] In the above invention, when measurement light is irradiated onto a container made of a light-transmitting material, the light is not incident at an angle onto the wall surface, and can be detected by passing through only one wall surface of the container, thereby preventing light attenuation and scattering when detecting transmitted light. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view of a spectral transmittance measuring device according to an embodiment of the present invention. [Figure 2] FIG. 1 is a front view of a spectral transmittance measuring device according to an embodiment. [Figure 3] 1A is a partially cutaway enlarged cross-sectional view of a light source unit and its periphery in a spectral transmittance measuring device according to an embodiment, and FIG. 1B is a partially cutaway enlarged cross-sectional view of a light receiving unit and its periphery. [Figure 4] 10(a) and 10(b) are explanatory diagrams illustrating the mechanical movement of the light source unit and the light receiving unit, which move forward and backward in synchronization using a rack and pinion. [Figure 5] FIG. 2 is an explanatory diagram illustrating a state in which a container is set in the spectral transmittance measuring device according to the embodiment. [Figure 6] 6 is an explanatory diagram illustrating a state in which a container different from that shown in FIG. 5 is set in the spectral transmittance measuring device according to the embodiment. [Figure 7] 1 is a block diagram showing the electrical configuration of a spectral transmittance measuring device. [Figure 8] FIG. 10 is an explanatory diagram illustrating a state in which a container is set in a spectral transmittance measuring device according to another embodiment of the present invention. [Figure 9] FIG. 1 is an explanatory diagram illustrating problems with a conventional measurement method. [Figure 10] FIG. 1 is an explanatory diagram illustrating problems with a conventional measurement method. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the optical device and the detection method of the present invention will be described with reference to the accompanying drawings. As shown in Figures 1 and 2, the spectral transmittance measuring device 1 as an optical device is configured with a measuring device main body 3 and a plastic switch box 4, both of which are mounted on a base plate 2 made of a flat plastic plate. The measuring device main body 3 is equipped with a bed 5 shaped like a cutting board, on which a plastic rail plate 6 is disposed. A light source unit 7 is fixedly disposed, penetrating the rail plate 6 from the center of the bed 5 and protruding upward. A light receiving unit 8 and a container holder 9 are disposed on both the left and right sides of the light source unit 7, with a gap between them. Both the light receiving unit 8 and the container holder 9 are mounted on the bed 5 so that they can move left and right in Figure 2. The area on the rail plate 6 sandwiched between the light receiving unit 8 and the container holder 9 is defined as the placement area S. The lower portions of the light-receiving unit 8 and the container holder 9 adjacent to the bed 5 constitute a slide section 10. Each slide section 10 has a slit 10a formed therein, into which a rail plate 6 is inserted. This allows the light-receiving unit 8 and the container holder 9 to slide left and right as viewed in FIG. 2 while being guided by the rail plate 6. As shown in FIG. 4, a first rack 11 and a second rack 12 are disposed within the bed 5 via a pinion gear 13 so as to be movable in opposite directions in synchronization with each other. The extension directions of the first rack 11 and the second rack 12 are arranged parallel to the sliding direction of the light-receiving unit 8 and the container holder 9. The first rack 11 is connected to the light-receiving unit 8, and the second rack 12 is connected to the container holder 9. The light source unit 7 is disposed midway between the two racks 11, 12 and the pinion gear 13. As a result, when the light receiving unit 8 and the container holder 9 slide, one movement is synchronized with the other, so that, for example, when the light receiving unit 8 moves toward the light source unit 7, the container holder 9 also moves toward the light source unit 7. The same is true when they move away from each other. Therefore, the light source unit 7 is always positioned midway between the light receiving unit 8 and the container holder 9. On the top surface of the switch box 4, a calibration button 15A, a measurement button 15B, and an indicator 15C are arranged.

[0012] Next, the structures of the light source unit 7, the light receiving unit 8, and the container holder 9 will be described in more detail. As shown in Figures 1, 2, 3(a), etc., the light source unit 7 includes a plastic case 20. The case 20 is composed of an embedded section 21, which serves as the base of the case and is embedded in the rail plate 6, and a cylindrical section 22 that rises from the embedded section 21. The cylindrical section 22 houses an LED 23 as a light source and an optical system. The LED 23 is disposed at a position overlapping the embedded section 21 at the lowest position of the cylindrical section 22. Cylinders 24A to 24C, each with a black inner surface, are disposed in series above and adjacent to the LED 23. The LED 23 is exposed inside the lowest cylinder 24A. The cylinders 24A to 24C are configured with a tapered top. This shape of the cylinders 24A to 24C contributes to the parallelization of light. A condenser lens 25, consisting of a convex lens that constitutes the optical system, is disposed adjacent to the top cylinder 24C. The condenser lens 25 converts the light from the LED 23 into approximately parallel light. A passage 26 is formed in front of (above) the condenser lens 25. The passage 26 is bent at 90 degrees midway, and the cylindrical body 24C of the bent passage 26 is connected to an outlet 27 on the upper side of the cylindrical portion 22. The outlet 27 is directed toward the light receiving unit 8. A mirror is formed in the passage 26. 30 The mirror is disposed at a position where the passage 26 is bent. 30 is arranged so that the mirror surface forms an angle of 45 degrees with respect to the parallel light from the condenser lens 25, and reflects the parallel light from the condenser lens 25 at an angle of 90 degrees and guides it to the exit 27.

[0013] As shown in Figures 1, 2, 3(b), etc., the light receiving unit 8 includes a plastic case 31. The surface of the case 31 facing the light source unit 7 is flat and serves as a contact surface 31a against which a container (described later) is held when being held. A first groove 32 extending vertically is formed in the center of the contact surface 31a in the front-to-rear direction to prevent misalignment. A power switch 33 is provided on the outer front surface of the case 31. The power switch 33 is used to power on the entire spectral transmittance measuring device 1. A communication hole 34 that communicates the inside and outside of the case 31 is formed in the contact surface 31a. The communication hole 34 is located exactly opposite the emission port 27 of the light source unit 7. A PD 28 serving as a light sensor is provided inside the communication hole 34. A circuit board 29 is provided adjacent to the PD 28. The container holder 9 is equipped with a plastic solid, flat, rectangular parallelepiped holder plate 35. The surface of the holder plate 35 facing the light source unit 7 is a flat surface that serves as a contact surface 35a against which a container (described later) comes into contact when being held. A second groove 36 extending vertically is formed in the center of the contact surface 35a in the front-to-rear direction to prevent misalignment. The second groove 36 faces the first groove 32.

[0014] Next, the electrical configuration of the spectral transmittance measuring device 1 will be described with reference to the block diagram of Fig. 7. Note that configurations that are not directly related to the present invention will be omitted. The controller MC mounted on the circuit board 29 as a control means and calculation means is connected to the LED 23, PD 28, calibration button 15A, measurement button 15B, indicator 15C, power switch 33, communication unit 37, etc. The controller MC is a computer device equipped with a known CPU, memories such as ROM and RAM, a timer, etc. The ROM in the controller MC stores the amount of light I (to be described later) obtained through the container based on the output from the PD 28. D , I R , I M The controller MC stores a transmitted light calculation program for calculating the transmitted light measured for each wavelength based on the data of the wavelengths.D , the light intensity I for each wavelength obtained as calibration data R , the amount of light per wavelength obtained through the container I M The numerical data of the transmittance T for each wavelength obtained by performing the comparison calculation is stored in the RAM. The controller MC also transmits the obtained numerical data of the transmittance T to an external computer device via the communication unit 37.

[0015] Next, we will explain the outline of how to use (detection method) the thus configured spectral transmittance measuring device 1. Note that the spectral transmittance measuring device 1 is placed in an environment such as a dark box to block out external light unnecessary for measurement. (A) First, the operator turns on the power switch 33 of the spectral transmittance measuring device 1, and starts up the PD 28 and the controller MC. Then, the indicator 15C lights up, indicating that the power is on. Then, with no container set as shown in Figures 1 and 2, the operator turns on the calibration button 15A. In response to the input of the calibration button 15A, the controller MC calculates the light intensity I D Immediately after that, the controller MC turns on the LED 23 and causes the PD 28 to detect the light intensity I R The controller MC detects the amount of light I and stores it in RAM as calibration data for transmittance calculation. R After acquisition, LED23 is temporarily turned off. (b) Next, as shown in FIG. 5, the container H1 to be measured is turned upside down and placed on the rail plate 6 between the light receiving unit 8 and the container holder 9 so as to cover the light source unit 7, i.e., on the rail plate 6 that constitutes the placement area S. The container H1 is a transparent plastic body with a circular outer periphery and an upper opening that is narrower than the body. The light receiving unit 8 and the container holder 9 are spaced apart by a distance greater than the width of the container H1 to prevent interference with the container H1 placed on the rail plate 6, and the light receiving unit 8 and the container holder 9 are gradually moved closer to the container H1 until they come into contact. The container H1 is fitted diametrically into the first groove 32 of the contact surface 31a and the second groove 36 of the contact surface 35a, preventing it from shifting laterally on the rail plate 6. In this case, the distance from the light source unit 7 to the light receiving unit 8 and the container holder 9 (more precisely, the distance from the outer periphery of the cylindrical portion 22 to the contact surfaces 31a and 35a, respectively) is always the same, so that the light source unit 7 is ultimately positioned relatively in the center inside the container H1 (state shown in Figure 5). (c) In this state, the operator holds the container H1 from both sides with the light receiving unit 8 and the container holder 9 to prevent it from rolling, and then presses the measurement button 15B. The controller MC turns on the LED 23, and the PD 28 outputs the light intensity I M The controller MC then detects the light intensity I and stores it in RAM as the transmittance light intensity data of the container. D , light intensity I R , light intensity I M Based on this, the transmittance T of the container H1 is calculated for each wavelength using the following formula 1. The numerical data is sent to an external computer device.

[0016]

number

[0017] Furthermore, when calculating the transmittance of container H2, which has a smaller diameter than container H1, the light intensity base and calibration data are acquired in the same manner as above, and then the transmittance data for the container is acquired and calculated. For container H2, as shown in Figure 6, the light receiving unit 8 and container holder 9 are brought even closer to the light source unit 7 than for container H1 to hold container H2, and measurement button 15B is pressed. In this case, the light source unit 7 is also positioned relatively in the center of the interior of container H2 (the state shown in Figure 6).

[0018] With the above-described configuration, the spectral transmittance measuring device 1 of this embodiment provides the following effects. (1) Conventionally, especially in containers whose upper openings are narrower than the body, the light source and detection unit had to be placed outside the container, and transmitted light had to be measured from the outside through two walls. However, in the spectral transmittance measuring device 1 of this embodiment, the light source unit 7 is placed inside the containers H1 and H2, and light passes through only one wall of the body of the container between the light source unit 7 and the light receiving unit 8, making it less likely that light will be attenuated or scattered. (2) The light source unit 7 is placed inside the containers H1 and H2, and the transmittance can be measured simply by placing the containers H1 and H2 upside down on the rail plate 6, so no special setup is required for measuring the transmittance of the containers H1 and H2. For example, if the container H1 is normally placed with the opening facing up and the light source unit 7 is lowered from above to enter the container, it would require equipment to support and lower the light source unit 7, a safety function to prevent the light source unit 7 from colliding with the container, and an environment to prevent the hanging light source from shaking due to vibration. (3) When the containers H1 and H2 are turned upside down, they are prone to rolling over. However, since the light receiving unit 8 and the container holder 9 support the containers, this risk is reduced. (4) In this embodiment, when the light receiving unit 8 and the container holder 9 hold the bodies of the containers H1 and H2, the round body portion fits perfectly into the first groove 32 and the second groove 36 in the diametric direction, making it easy to hold and difficult to come off from the holding position. (5) The light receiving unit 8 and the container holder 9 move forward and backward in sync, so moving one of them will cause the other to follow, which is advantageous in terms of operation. If the containers H1 and H2 are positioned so that the light source unit 7 is roughly in the center of the containers H1 and H2, the light receiving unit 8 and the container holder 9 will interfere with the containers H1 and H2 and stop, preventing the light source unit 7 from coming into contact with the light receiving unit 8 or the containers H1 and H2. (6) The light receiving unit 8 holds the containers H1 and H2 and is placed in close contact with the wall of the body, so that light that tends to scatter can be collected without leaking.

[0019] The above-described embodiment has been described merely as a specific embodiment for illustrating the principles and concepts of the present invention. In other words, the present invention is not limited to the above-described embodiment. The present invention can also be embodied in the following modified forms, for example. For example, the arrangement of the light source unit 7 and the light receiving unit 8 inside and outside the container in the above embodiment may be reversed. For example, as shown in Figure 8, the light source unit 41 may be arranged on the outside and the light receiving unit 42 on the inside. In the above embodiment, the light receiving unit 8 and the container holder 9 are configured to move forward and backward (moving) in sync, but they may also move independently. Also, only the container holder 9 may be configured to move forward and backward (i.e., the light source unit 7 and the light receiving unit 8 are fixed). In the above embodiment, it is assumed that the light receiving unit 8 and the container holder 9 are manually pushed by an operator, but it is also possible to configure the light source (or detection means) housing and the container holder disposed outside the container to move by a driving means such as a motor or cylinder device while the container is set. The positional relationship with the container may be detected using a pressure sensor or optical sensor to determine the holding position relative to the container, or the container holder etc. may be moved by manually operating a switch (for example, energizing when the switch is on and deenergizing when it is off). In the above embodiment, the light receiving unit 8 is always located in the center of the containers H1 and H2 and is positioned at a distance from the light receiving unit 8. However, as shown in FIG. 8, either the light source unit 41 or the light receiving unit 42 may be positioned closer to the other to reduce light scattered in the air as much as possible. Detection means other than the PD28 may be used. A light source other than the LED 23 may be used. An integrating sphere may be used to collect light on the light receiving unit side. In the above embodiment, the light receiving unit 8 and the container holder 9 are held in contact with the containers H1 and H2, but they may be used in such a way that they are simply in close proximity without contact. In the above embodiment, the numerical data is transmitted to an external computer device, but the spectral transmittance measuring device 1 itself may be configured to include an output means (for example, a monitor or printer). Although the above embodiment illustrates and describes the most suitable example in which the container is turned upside down, the present invention can also be realized without turning the container upside down. In other words, without turning the container upside down, it is also possible to measure by inserting either the light source or the detection means into the container from above in a normal installation state and aligning the other of the light source or detection means located on the outside directly across the container wall.

[0020] The present invention is not limited to the configurations described in the above-described embodiments. The components of the above-described embodiments and variations may be arbitrarily selected and combined. Furthermore, any component of each embodiment or variation may be arbitrarily combined with any component described in the Summary of the Invention or any component embodying any component described in the Summary of the Invention. The present invention also intends to obtain rights to these by filing an amendment or divisional application of this application. Furthermore, the applicant intends to obtain rights to the overall design or partial design by filing a conversion application to a design application. The drawings depict the entire device in solid lines, but they also include partial designs claimed for parts of the device. For example, not only can a part of the device be a partial design, but the drawings also include a part of the device as a partial design regardless of the part. A part of the device may be a part of the device, or a part of that part. [Explanation of symbols]

[0021] 1...spectral transmittance measuring device, 21...LED as light source, 28...PD as detection means, H1, H2...container, S...arrangement area.

Claims

1. a light source, a detection means disposed opposite the light source for detecting transmitted light from the light source, and an arrangement area for arranging a light-transmitting container, wherein when the container is disposed in the arrangement area, the light source is accommodated within the container, and the transmitted light after light irradiated from the light source and transmitted through the container is detected by the detection means; An optical device characterized in that a container holding section for holding the container is arranged on the side of the placement area, the container holding section is movable in a direction approaching or moving away from the placement area, and when the container holding section moves, the light source or the detection means arranged outside the container is movable in a direction approaching or moving away from the placement area in synchronization with the container holding section.

2. The optical device according to claim 1, wherein the light source protrudes upward within the placement area, and the container is placed in the placement area inverted with the opening facing downward to accommodate the light source inside.

3. The optical device according to claim 1, characterized in that the detection means protrudes upward within the placement area, and the container is inverted with its opening facing downward and placed in the placement area to accommodate the detection means inside.

4. An optical device described in any one of claims 1 to 3, characterized in that when the light source or the detection means moves in a direction approaching or moving away from the placement area in synchronization with the container holding portion, the light source or the detection means that is not synchronized with the container holding portion is always positioned at an intermediate position between the container holding portion and the light source or the detection means that is synchronized with the container holding portion.

5. 5. The optical device according to claim 1, wherein the detecting means separates the light into wavelengths and detects the light for each wavelength.

6. 6. The optical device according to claim 1, further comprising a calculation means for measuring the transmittance of the container side surface based on the transmitted light information.

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