Optical measuring device and optical measuring method

Abstract

Reduces the temperature rise of the object being measured. [Solution] The system comprises a light irradiation unit that irradiates light onto an object to be measured, a light receiving unit that collects reflected light generated when the irradiated light is reflected by the object to be measured, a light shielding unit installed between the light irradiation unit and the object to be measured and capable of blocking the irradiated light from reaching the object to be measured, an analysis unit that analyzes the reflected light collected by the light receiving unit, a flow measurement unit that measures the flow status of the object to be measured, and a control unit that controls the light shielding unit. When the control unit determines that the object to be measured is not flowing based on the flow status of the object to be measured measured by the flow measurement unit, it causes the light shielding unit to block the irradiated light.

Description

Technical Field

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[0001] The present disclosure relates to an optical measurement device and an optical measurement method.

Background Art

[0002] Conventionally, a technique for measuring a measurement object by irradiating the measurement object with light and measuring the reflected light has been known.

[0003] In Patent Document 1, a configuration for analyzing a measurement object using the spectra of measurement light reflected by the measurement object and reference light reflected by irradiating a standard reflection means is disclosed.

[0004] In Patent Document 2, in order to maintain a thermal equilibrium state, the temperature rise of an interference filter is prevented by sequentially switching the interference filter while blocking the irradiation light with a shutter without repeatedly turning on and off the light source.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the case of the configuration described in Patent Document 1, in order to obtain a spectrum with a good S / N, it is necessary to increase the amount of light projected onto the measurement object. However, when the amount of light is increased, the temperature of the measurement object rises due to the measurement light. In particular, when the measurement object is stationary, since the same part of the measurement object is continuously irradiated with light, the thermal influence on the measurement object becomes large.

[0007] The invention described in Patent Document 2 can address the temperature rise of the interference filter, which is a component of the measuring instrument, but it does not address the temperature rise of the object being measured.

[0008] The purpose of this disclosure is to provide an optical measuring device and an optical measuring method that can reduce the temperature rise of an object being measured. [Means for solving the problem]

[0009] Some embodiments of the light measuring device include a light irradiation unit that irradiates an object to be measured with irradiation light, a light receiving unit that collects reflected light generated when the irradiation light is reflected by the object to be measured, a light shielding unit installed between the light irradiation unit and the object to be measured and capable of blocking the irradiation light from reaching the object to be measured, an analysis unit that analyzes the reflected light collected by the light receiving unit, a flow measuring unit that measures the flow status of the object to be measured, and a control unit that controls the light shielding unit, wherein the control unit determines that the object to be measured is not flowing based on the flow status of the object to be measured measured by the flow measuring unit, and causes the light shielding unit to block the irradiation light.

[0010] This makes it possible to reduce the temperature rise of the object being measured.

[0011] In one embodiment of the light measuring device, a reference material may be attached to the surface of the light shielding portion on the side of the light irradiation portion. This allows the reference material to reflect the irradiation light when the irradiation light is shielded.

[0012] In one embodiment of the light measuring device, the analysis unit may be calibrated using light reflected by the reference material of the light-shielding unit. This allows the analysis unit to be calibrated when the irradiated light is shielded.

[0013] In one embodiment of the optical measuring device, the flow measurement unit measures the object to be measured and acquires flow measurement data, and the control unit may determine whether the object to be measured is flowing or not based on the value of the flow measurement data. This makes it possible to control the light shielding unit in accordance with the flow condition of the object to be measured flowing through the flow path.

[0014] In one embodiment of the optical measuring device, the device further includes a flow channel through which the object to be measured flows, and the flow measurement unit may acquire the flow rate of the object to be measured flowing through the flow channel as flow measurement data. This allows the light shielding unit to be controlled according to the flow rate of the object to be measured flowing through the flow channel.

[0015] In one embodiment of the optical measuring device, the device further includes a flow channel through which the object to be measured flows, and the flow measurement unit may acquire the pressure in the flow channel as flow measurement data. This allows the light shielding unit to be controlled according to the pressure in the flow channel based on the object to be measured flowing through the flow channel.

[0016] In one embodiment of the optical measuring device, the device further includes a flow channel through which the object to be measured flows. The flow measurement unit acquires an image of the flow channel at predetermined intervals, and the control unit determines whether the object to be measured is flowing or not by processing the image. This allows the light-shielding unit to be controlled based on the image of the object to be measured flowing through the flow channel.

[0017] In one embodiment of the optical measuring device, the control unit may compare the image with the previously acquired image, calculate the rate of change of the object to be measured, and determine whether the object to be measured is in a flowing state or not based on the rate of change. This makes it possible to control the light-shielding unit based on an image of the object to be measured flowing through the channel.

[0018] In the optical measurement device according to one embodiment, the optical measurement device further includes a flow path through which the measurement object flows, the flow path includes a valve that controls the flow of the measurement object, and the control unit may determine that the measurement object is not flowing when the valve is closed. Thereby, the light shielding unit can be controlled according to the operating state of the valve provided in the flow path.

[0019] Some embodiments of the optical measurement method include an irradiation step of irradiating the measurement object with irradiation light, a light receiving step of condensing the reflected light generated by the irradiation light being reflected by the measurement object, an analysis step of analyzing the reflected light condensed in the light receiving step, a flow measurement step of measuring the flow state of the measurement object, and a blocking step of blocking the irradiation light when it is determined that the measurement object is not flowing based on the flow state of the measurement object measured in the flow measurement step.

[0020] Thereby, the temperature rise of the measurement object can be reduced.

Advantages of the Invention

[0021] According to the present disclosure, it is possible to provide an optical measurement device and an optical measurement method capable of reducing the temperature rise of the measurement object.

Brief Description of the Drawings

[0022] [Figure 1] It is a diagram schematically showing the configuration of an optical measurement device according to an embodiment of the present disclosure. [Figure 2A] It is a diagram showing an example of the light shielding unit in the non-light shielding state provided in the optical measurement device of FIG. 1. [Figure 2B] It is a diagram showing an example of the light shielding unit in the light shielding state provided in the optical measurement device of FIG. 1. [Figure 3A] It is a diagram showing another example of the light shielding unit in the non-light shielding state provided in the optical measurement device of FIG. 1. [Figure 3B] It is a diagram showing another example of the light shielding unit in the light shielding state provided in the optical measurement device of FIG. 1. [Figure 4]This flowchart shows an example of a process by which an optical measuring device according to one embodiment of the present disclosure measures an object to be measured. [Modes for carrying out the invention]

[0023] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In each drawing, parts having the same configuration or function are denoted by the same reference numerals. In the description of this embodiment, redundant descriptions of the same parts may be omitted or simplified as appropriate.

[0024] Figure 1 is a schematic diagram showing the configuration of an optical measuring device 1 according to one embodiment of the present disclosure.

[0025] An optical measuring device 1 according to one embodiment of the present disclosure comprises a control unit 10, a storage unit 11, a light irradiation unit 12, a light receiving unit 13, a light shielding unit 14, a light guiding unit 15, an analysis unit 16, a fixing unit 17, a mounting unit 18, a flow path 19, and a flow measurement unit 20. In one embodiment of the present disclosure, the object to be measured 300 is a fluid that has the property of reflecting or scattering light, and may include slurries, colloids, emulsions, etc.

[0026] The control unit 10 performs various processes related to the operation of the optical measuring device 1 and controls each part of the optical measuring device 1. The control unit 10 includes one or more processors, one or more dedicated circuits, or a combination thereof. The processor is a general-purpose processor such as a CPU (Central Processing Unit) or GPU (Graphics Processing Unit), or a dedicated processor specialized for a specific process. The dedicated circuit is, for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). The control unit 10 may realize its control function by executing a program stored in the memory unit 11.

[0027] The storage unit 11 includes one or more semiconductor memories, one or more magnetic memories, one or more optical memories, or a combination of at least two of these. Semiconductor memories are, for example, RAM (Random Access Memory) or ROM (Read Only Memory). RAM is, for example, SRAM (Static RAM) or DRAM (Dynamic RAM). ROM is, for example, EEPROM (Electrically Erasable Programmable ROM). The storage unit 11 functions, for example, as a main memory, auxiliary memory, or cache memory. The storage unit 11 may store programs and data used for the operation of the optical measuring device 1. The operation of the storage unit 11 may be controlled by the control unit 10.

[0028] The light irradiation unit 12 irradiates the object to be measured 300 with irradiation light. The light irradiation unit 12 may be, for example, a tungsten lamp, halogen lamp, xenon lamp, LED (Light Emitting Diode), laser, etc. The irradiation light may have a wavelength that matches the optical properties of the object to be measured 300. The wavelength that matches the optical properties is, for example, a wavelength that is absorbed or scattered by the object to be measured 300, and may have wavelengths in the ultraviolet region, visible region, near-infrared region, or infrared region. The irradiation light may be irradiated directly onto the object to be measured 300, or the irradiation light may be guided from a light source outside the optical measuring device 1 into the optical measuring device 1 using a light guiding means and irradiated onto the object to be measured 300. The light guiding means may be, for example, an optical fiber, optical coupler, optical conduit, or mirror. The operation of the light irradiation unit 12 may be controlled by the control unit 10.

[0029] The light-receiving unit 13 collects the reflected light generated when the irradiated light is reflected by the object to be measured 300. The light-receiving unit 13 may be, for example, an optical lens or an integrating sphere.

[0030] Figures 2A and 2B show an example of a light-shielding section 14 according to one embodiment of the present disclosure. Figures 3A and 3B show another example of a light-shielding section 14 according to one embodiment of the present disclosure. The light-shielding section 14 is installed between the light irradiation section 12 and the object to be measured 300 and has a configuration that blocks or reduces the irradiation light irradiated from the light irradiation section 12 to the object to be measured 300. The light-shielding section 14 is, for example, an openable and closable shutter. The light-shielding section 14 has a reference material 141 on the side facing the light irradiation section 12. The operation of the light-shielding section 14 may be controlled by the control unit 10.

[0031] The reference material 141 is a substance that reflects irradiated light and can be used to calibrate the instrument. The reference material 141 is attached to or coated on the surface of the light-shielding section 14 that faces the light-irradiating section 12. The material constituting the reference material 141 may be, for example, barium sulfate, fluororesin, PTFE, gold, aluminum, or other metals.

[0032] In the example of the light-shielding portion 14 shown in Figures 2A and 2B, the light-shielding portion 14 is provided with an axis and has a structure that rotates around this axis. In this case, when light is being shielded, the control unit 10 may adjust the light-shielding portion 14 to a position that can block the irradiated light, as shown in Figure 2B, and when not being irradiated, it may adjust the light-shielding portion 14 to a position that does not block the irradiated light, as shown in Figure 2A. In addition, a reference material 141 may be attached to or coated on the surface of the light-shielding portion 14 facing the light-irradiating portion 12.

[0033] In the example of the light-shielding section 14 shown in Figures 3A and 3B, the light-shielding section 14 includes a shutter made of five shutter blades arranged in a circle. In this case, the control unit 10 may close the shutter when light is being shielded, as shown in Figure 3B, and open the shutter when light is not being shielded, as shown in Figure 3A. Furthermore, the shutter on the side of the light-shielding section 14 facing the light-emitting section 12 may be coated with a reference material 141.

[0034] The light guide unit 15 guides the reflected light collected by the light receiving unit 13 to the analysis unit 16. The light guide unit 15 is, for example, an optical fiber, an optical coupler, an optical conduit, or a mirror.

[0035] The analysis unit 16 analyzes the reflected light collected by the light receiving unit 13 and received via the light guiding unit 15. The analysis unit 16 may, for example, detect the intensity of the reflected light at each wavelength. The analysis unit 16 may include, for example, a spectrometer and an analyzer. The spectrometer may include a device with spectral capabilities such as a diffraction grating, interferometer, or filter. The operation of the analysis unit 16 may be controlled by the control unit 10.

[0036] The analyzer may include one or more processors, one or more dedicated circuits, or a combination thereof. The processor may be a general-purpose processor such as a CPU (Central Processing Unit) or GPU (Graphics Processing Unit), or a dedicated processor specialized for a specific process. The dedicated circuit may be, for example, an FPGA (Field-Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). The analyzer may calculate the component concentrations of the object to be measured 300 from the obtained reflected light intensity by means of multivariate analysis or other means. The control unit 10 may also provide the functions of the analyzer.

[0037] The fixing part 17 fixes the light irradiation part 12, the light receiving part 13, and the light shielding part 14. The fixing part 17 may also fix the observation window 191. The fixing part 17 may be integrated with the flow path 19.

[0038] The mounting portion 18 secures the fixing portion 17 to the flow path 19. The mounting method is not particularly limited, but it may be attached by clamps or screws, for example.

[0039] The flow path 19 stores or transports the object to be measured 300. The flow path 19 may be, for example, a tank or a pipe. The flow path 19 includes an observation window 191 and a valve 192.

[0040] The observation window 191 is part of the flow path 19 and transmits the light emitted from the light irradiation unit 12 and the reflected light from the object to be measured 300. The observation window 191 may be made of a material such as acrylic resin, glass, quartz, sapphire, or diamond. The observation window 191 may be coated to prevent reflection of wavelengths used for analysis.

[0041] Valve 192 controls the flow of the object to be measured 300 by opening and closing the flow path 19. Valve 192 is, for example, a globe valve, a gate valve, a ball valve, etc., but is not limited to these. The operation of valve 192 may be controlled by the control unit 10. The operation of valve 192 may be controlled by the control unit 10.

[0042] The flow measurement unit 20 measures the flow state of the object to be measured 300 in the flow path 19. The flow measurement unit 20 may be, for example, a pressure gauge, a flow meter, or a camera. When the flow measurement unit 20 measures the flow state of the object to be measured 300, it transmits the flow measurement data, which is the measurement data of the flow state, to the control unit 10. The operation of the flow measurement unit 20 may be controlled by the control unit 10.

[0043] Next, the processes performed by each part of the optical measuring device 1 will be described. In one embodiment of this disclosure, the optical measuring device 1 measures and analyzes the spectrum of reflected light from the object to be measured 300 using the diffuse reflectance method.

[0044] (Analysis Department Calibration) The calibration process for the analysis unit 16 is described below. The calibration of the analysis unit 16 is performed using a reference material 141 attached to the light shielding unit 14 when the light shielding unit 14 is in the blocked state. Specifically, the calibration method is as follows: First, the light irradiation unit 12 irradiates light onto the object to be measured 300. The irradiated light is reflected by the reference material 141 attached to the light shielding unit 14 in the blocked state. The reference reflected light reflected by the reference material 141 is focused by the light receiving unit 13 and guided to the analysis unit 16 via the light guiding unit 15.

[0045] The analysis unit 16 calculates the spectrum I0(λ) of the reference substance 141 from the received reference reflected light. The analysis unit 16 stores the calculated spectrum I0(λ) in the storage unit 11.

[0046] (Measurement of the object being measured) Next, the measurement process of the object to be measured 300 by the optical measuring device 1 will be described. The light irradiation unit 12 irradiates light toward the object to be measured 300 in the flow path 19 through the light shielding unit 14 and observation window 191 in an unblocked state. The light receiving unit 13 collects the reflected light reflected by the object to be measured 300 and guides it to the analysis unit 16 via the light guiding unit 15.

[0047] The analysis unit 16 calculates the spectrum I(λ) of the object to be measured 300 from the received reflected light. Then, the analysis unit 16 retrieves the spectrum I0(λ) of the reference substance 141 stored in the memory unit 11, and calculates a spectrum based on the reference data from spectra I0(λ) and I(λ). The spectrum based on the reference data may, for example, use the reflectance R(λ) calculated by equation (1) below, the absorbance A(λ) calculated by equation (2) below, and the Kubelker-Mung function of equation (3) below. In equation (3) below, K is the absorption coefficient and S is the scattering coefficient.

number

[0048] The analysis unit 16 inputs a spectrum based on reference data into a calibration model stored in the memory unit 11 and calculates the component concentrations of the object to be measured 300. The calibration model is a model created using spectral data based on reference data to predict the target object from the spectrum. The calibration model may be created using multiple regression, PCR (principal component regression), PLS regression (partial least squares regression), artificial neural network (ANN), or a combination of these methods, but the method of creating the calibration model is not limited to these. The analysis unit 16 may calculate a spectrum based on reference data before creating the calibration model.

[0049] (Determination of the flow state of the object being measured) Next, the process by which the control unit 10 and the flow measurement unit 20 determine the flow state of the object to be measured 300 will be described. The flow measurement unit 20 measures the flow state of the object to be measured 300 at predetermined intervals. The measurement method differs depending on the configuration of the flow measurement unit 20, but for example, if it is a flow meter, it measures the amount of the object to be measured 300 flowing through the flow path 19 per unit time.

[0050] The flow measurement unit 20 measures the flow state of the object to be measured 300 and transmits the acquired flow measurement data to the control unit 10. The control unit 10 checks whether the value of the flow measurement data is within the flow determination range. The flow determination range is a preset range and is set in units appropriate to the measurement method. If the value of the flow measurement data is within the flow determination range, the control unit 10 determines that the object to be measured 300 is in a flow state. If the flow measurement unit 20 is a flow meter, a flow amount above a certain level is set as the flow determination range.

[0051] If the flow measurement unit 20 is a camera, the flow measurement unit 20 takes a picture of the object to be measured 300 in the flow path 19 at predetermined intervals and transmits the image data to the control unit 10 as flow measurement data. The control unit 10 performs image processing on the image data and calculates the rate of change compared to the image data acquired previously. The control unit 10 checks whether the calculated rate of change is within the flow determination range, and if it is within the flow determination range, it determines that the object to be measured 300 is in a flowing state.

[0052] The control unit 10 may check the open / closed status of the valve 192, and if the valve 192 is closed, it may determine that the object to be measured 300 is in a flowing state. In this case, if the valve 192 is open, the control unit 10 may determine the flowing state of the object to be measured 300 using the usual determination method with a flow determination range.

[0053] (Control of the light-shielding part) Next, the control of the light-shielding section 14 will be explained. In the following explanation, we will use the case where the light-shielding section 14 is controlled by the control unit 10 to switch between a light-shielding state and an un-light-shielding state as an example. The control unit 10 determines whether the object to be measured 300 is in a flowing state or not. If the object to be measured 300 is in a flowing state, the control unit 10 controls the light-shielding section 14 to be in an un-light-shielding state. On the other hand, if the object to be measured 300 is not in a flowing state, the control unit 10 controls the light-shielding section 14 to be in a light-shielding state.

[0054] With this configuration, the optical measuring device 1 can measure the object 300 when it is in a flowing state. Furthermore, when the object 300 is not flowing, the optical measuring device 1 can prevent the irradiation light from reaching the object 300, thereby reducing the temperature rise of the object 300. In addition, when the object 300 is not flowing, the optical measuring device 1 can calibrate the analysis unit 16.

[0055] The following describes an example of the control process of the optical measuring device 1 according to one embodiment of this disclosure, with reference to Figure 4. Figure 4 is a flowchart showing the process flow of the optical measuring device 1 according to one embodiment of this disclosure when measuring an object 300.

[0056] When measurement begins, the flow measurement unit 20 first measures the flow conditions of the object to be measured 300 in the flow path 19 and acquires flow measurement data (step S101). The flow measurement unit 20 transmits the acquired flow measurement data to the control unit 10.

[0057] The control unit 10 checks whether the flow measurement data value is within the flow determination range (step S102). If the flow measurement data value is within the flow determination range (step S102: Yes), the control unit 10 determines that the object to be measured 300 is in a flowing state and proceeds to step S103. If the flow measurement data value is not within the flow determination range (step S102: No), the control unit 10 determines that the object to be measured 300 is not in a flowing state and proceeds to step S105.

[0058] If the control unit 10 determines that the object to be measured 300 is in a flowing state, it controls the light shielding unit 14 so as not to block the light irradiated from the light irradiation unit 12 to the object to be measured 300 (step S103). Because the light irradiated is not blocked by the light shielding unit 14, the light irradiated is reflected by the object to be measured 300, the reflected light is collected by the light receiving unit 13 and guided to the analysis unit 16.

[0059] The analysis unit 16 calculates the component concentration of the object to be measured 300 based on the received reflected light (step S104).

[0060] If the control unit 10 determines that the object to be measured 300 is not in a flowing state, it controls the light shielding unit 14 to shield the irradiation light from the light irradiation unit 12 to the object to be measured 300 (step S105). As the irradiation light is shielded by the light shielding unit 14, the irradiation light is reflected by the reference material 141 attached to the light shielding unit 14, and the light receiving unit 13 collects the reference reflected light and guides it to the analysis unit 16.

[0061] The analysis unit 16 calculates the spectrum I0(λ) of the reference substance 141 based on the received reference reflected light (step S106).

[0062] When step S104 or S106 is completed, the control unit 10 confirms whether to terminate the measurement (step S107). If the measurement is to be continued (step S107: No), the process starts again from step S101. In this case, a predetermined interval may be left between the completion of the previous step S101 and the start of the next step S101. If the measurement is to be terminated (step S107: Yes), the process is terminated.

[0063] If the spectrum I0(λ) of the reference material 141 has not been obtained, such as during the initial processing, the process in step S105 may be performed before starting the process in step S101. In this case, the photometer 1 may start the process in step S101 once the process in step S105 is completed.

[0064] By adopting this configuration, the optical measuring device 1 can reduce the temperature rise of the object to be measured 300 by shielding the irradiated light when the object to be measured 300 is not flowing. Furthermore, by shielding the light without turning off the power to the light irradiation unit 12, the internal temperature of the optical measuring device 1 can be maintained, and the impact of temperature changes on the optical measuring device 1 can be reduced. In addition, by performing calibration of the analysis unit 16 when the object to be measured 300 is stationary and the measurement value does not change, the measurement time can be used efficiently.

[0065] Next, as a modification of this embodiment, a method for determining the flow state of the object to be measured 300 by measuring reflected light will be described. The control unit 10 operates the light-shielding unit 14 periodically to an unshielded state when light is blocked. The control unit 10 determines the flow state of the object to be measured 300 from the reflected light analyzed by the analysis unit 16. The determination criteria are not particularly limited, but for example, the control unit 10 may determine the flow state of the object to be measured 300 by whether the rate of change of the component concentration of the object to be measured 300 calculated by the analysis of reflected light is within the flow determination range. In this case, the flow measurement unit 20 may be omitted.

[0066] This disclosure is not limited to the embodiments described above. For example, multiple blocks described in the block diagram may be combined, or a single block may be divided. Instead of executing multiple steps described in the flowchart in chronological order as described, they may be executed in parallel or in a different order, depending on the processing capacity of the device performing each step, or as necessary. Other modifications are possible without departing from the spirit of this disclosure.

[0067] For example, although the above embodiment describes an example in which the control unit 10 and the analysis unit 16 are configured separately, the processing of the analyzer in the analysis unit 16 may be performed by the control unit 10.

[0068] Furthermore, the temperature of the reference substance 141 may rise due to the irradiation light, potentially affecting the calculation of the spectrum of the reference substance 141. To address this, the control unit 10 may control the optical measuring device 1 to calculate the spectrum of the reference substance 141 after a certain period of time has elapsed since the light-shielding unit 14 was moved to the light-shielding state. Alternatively, a shutter to which the reference substance 141 is attached may be provided separately from the light-shielding unit 14 for the purpose of calculating the spectrum of the reference substance 141. [Explanation of Symbols]

[0069] 1. Optical measuring device 10 Control Unit 11 Storage section 12 Light-irradiating section 13 Light receiving part 14 Light-shielding part 141 Reference material 15 Light guide section 16 Analysis Department 17 Fixed part 18 Mounting part 19 channels 191 Observation window 192 valves 20 Flow Measurement Section 300 objects to be measured

Claims

1. A light irradiation unit that irradiates the object to be measured with light, A light receiving unit that collects reflected light generated when the aforementioned irradiated light is reflected by the object to be measured, A light shielding unit is installed between the light irradiation unit and the object to be measured, and is capable of blocking the irradiation light from reaching the object to be measured. An analysis unit that analyzes the reflected light collected by the light receiving unit, A flow measurement unit for measuring the flow conditions of the object to be measured, The system includes a control unit for controlling the light-shielding portion, The control unit determines, based on the flow status of the object to be measured measured by the flow measurement unit, that the object to be measured is not flowing, and then blocks the irradiated light from the light shielding unit, in this light measuring device.

2. The optical measuring device according to claim 1, A reference material is attached to the surface of the light-shielding portion on the side facing the light-irradiating portion. Light measuring device.

3. The optical measuring device according to claim 2, The analysis unit performs calibration using light reflected by the reference material of the light-shielding unit. Light measuring device.

4. The optical measuring device according to claim 1, The flow measurement unit measures the object to be measured and acquires flow measurement data. The control unit determines, based on the values ​​of the flow measurement data, whether the object to be measured is in a flowing state or not. Light measuring device.

5. The optical measuring device according to claim 4, The system further comprises a flow channel through which the object to be measured flows, The flow measurement unit acquires the amount of flow of the object to be measured flowing through the flow path as flow measurement data. Light measuring device.

6. The optical measuring device according to claim 4, The system further comprises a flow channel through which the object to be measured flows, The flow measurement unit acquires the pressure of the flow path as flow measurement data. Light measuring device.

7. The optical measuring device according to claim 1, The system further comprises a flow channel through which the object to be measured flows, The flow measurement unit acquires images of the flow path at predetermined intervals, The control unit determines whether the object to be measured is in a flowing state or not by processing the image. Light measuring device.

8. The optical measuring device according to claim 7, The control unit, The aforementioned image is compared with the image acquired immediately before it, and the rate of change of the object being measured is calculated. Based on the rate of change, it is determined whether the object being measured is in a flowing state or not. Light measuring device.

9. The optical measuring device according to claim 1, The system further comprises a flow channel through which the object to be measured flows, The flow path includes a valve that controls the flow of the object to be measured. The control unit determines that the object to be measured is not flowing when the valve is closed. Light measuring device.

10. An irradiation step in which light is shone onto the object to be measured, A light receiving step of collecting reflected light generated when the aforementioned irradiated light is reflected by the object to be measured, An analysis step which involves analyzing the reflected light collected in the light receiving step, A flow measurement step for measuring the flow conditions of the object to be measured, If it is determined that the object to be measured is not flowing based on the flow condition of the object measured in the flow measurement step, the method includes a blocking step of blocking the irradiated light. Light measurement method.

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