JP2013205203A - Defatted state measuring apparatus, defatted state measuring system, and method for measuring defatted state - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defatted state measuring apparatus capable of measuring a defatted state of a further local inspection area, and further stably and accurately measuring the defatted state.SOLUTION: A defatted state measuring apparatus 10 comprises: a light source 11 for emitting excitation light to an inspection object 200; a spectroscopic element 12 for dispersing the excitation light into transmitted excitation light S and reflected excitation light; a photo detector 15 that detects the reflected excitation light and outputs the detection result to a light output control circuit 7 for performing feedback control on the intensity of the excitation light; an excitation light condenser lens 13 for condensing the transmitted excitation light S; and a visible light detector 23 that detects light Sf of a visible light component generated when the transmitted excitation light S is applied to the inspection object 200 and outputs the detection result to a signal processing unit 6 for generating information corresponding to the defatted state of the inspection object 200.

Description

  The present invention relates to a degreasing state measuring device, a degreasing state measuring system, and a degreasing state measuring method, and more specifically, a degreasing state measuring device, a degreasing state measuring system, and a degreasing method for measuring a degreasing state of a metal surface. It relates to a state measurement method.

  Conventionally, the surface of a metal, particularly a steel plate, is subjected to a plating treatment or a coating treatment for its beauty and / or surface protection. However, as a pre-process for performing these treatments, the steel plate is subjected to machining such as pressing or drilling, so that the lubricating oil adheres to the metal surface. Moreover, when the metal is a treated steel plate such as an electrogalvanized steel plate, for example, oil and fat adhere to the surface for the same reason.

  However, when the plating process or the coating process is performed in a state where the oil or fat is attached to the metal surface, the adhesion of the plating film or the coating film is lowered and the quality is deteriorated. Therefore, in order to solve such a problem, a cleaning process for removing oils and fats on the metal surface is performed before the plating process or the coating process.

  Ideally, the oil and fat cleaning of the metal surface is repeatedly performed a plurality of times to completely remove the oil and fat, but there are limits to the number of times of cleaning in consideration of mass productivity and cost. More specifically, in the mass production process, it is necessary to perform a series of processes related to mass production within a certain time, and it is not possible to devote much time to the cleaning process. Further, when the number of times of cleaning increases, the amount of cleaning liquid used increases and the cost increases. Furthermore, since the cleaning liquid is usually treated as industrial waste after use, an increase in the amount of the cleaning liquid used is not preferable from the viewpoint of environmental problems and energy saving.

  In addition, even if the cleaning process is repeated multiple times, if the liquid after cleaning (including a small amount of oil) adheres to the corners or irregularities of the metal plate, after the liquid has dried, a small amount of oil and / or its residue Will be attached. Hereinafter, the oil remaining on the metal surface and its residue are collectively referred to as fats and oils. Even when a small amount of oil or fat remains on the metal surface in this way, plating or coating may cause uneven plating or coating, or the plating film or coating film may be easily peeled off. Furthermore, in the case of a treated steel plate, its aesthetics are impaired.

  Therefore, in order to solve the above-mentioned various problems, whether the oil or fat has been completely removed from the metal surface by the cleaning process immediately before the plating process or the coating process, or whether the oil or fat has been removed to a level where there is no problem, It is necessary to measure the degreasing state of the metal surface. In particular, on the production site, a technique capable of measuring a degreased state without using a large-scale apparatus and easily and without destroying a sample (product) is required.

  By the way, the following various methods are mentioned as a conventional quantitative measurement method of a degreasing state.

(1) Gravimetric method In the gravimetric method, the weight of the sample is measured before and after the washing step, and the degreased state is measured based on the difference between the two. However, it is generally known that this method has low oil and fat detection accuracy. Moreover, this method is generally performed by taking out a part of a sample (metal plate) to be a product. In other words, this method requires the destruction of the sample and is not a practical method at the production site.

(2) Technique Using Infrared Generally, when a molecule having two or more different atoms bonded thereto is irradiated with infrared rays, the molecules vibrate by absorbing a component of a predetermined wavelength contained in the irradiated infrared rays. Therefore, the substance can be specified by irradiating the molecule with infrared rays and specifying the absorbed wavelength component. Various devices for identifying substances using such properties have been developed in the past. Such an inspection apparatus can be provided independently as a signal processing apparatus using the infrared irradiation unit and the detection unit as probes. Therefore, such an inspection apparatus using infrared rays is relatively small and many are suitable for production sites.

  However, when inspecting oil or dirt remaining on the metal surface by a technique using infrared rays, the wavelength to be absorbed differs depending on the components of the oil or dirt substance. Therefore, when you want to detect a specific component, you only need to detect the wavelength that is unique to that component. However, if you do not know such a component, you must investigate a wide wavelength range, so Becomes difficult. Also, with this technique, it is difficult to detect a small amount of fat on the metal surface.

(3) Method using ultraviolet rays (for example, see Patent Document 1)
It has been well known that when an organic oil or fat is irradiated with ultraviolet rays, a fluorescent phenomenon occurs (visible light is generated). In this phenomenon, for example, assuming that the amount of ultraviolet rays to be irradiated is UV and the amount of generated fluorescence is VL, a relationship of VL = η × UV is established between the two. The constant η in this relational expression is the fluorescence conversion efficiency (light emission efficiency) of the substance when irradiated with ultraviolet rays, and this value varies depending on the amount of components of the substance such as fats and oils. However, according to the verification by the present inventors, it is known that the value of the fluorescence conversion efficiency η has a small difference depending on the type of oil.

  Moreover, the following various methods are mentioned as a conventional qualitative degreasing state measurement method.

(1) Method by process control Generally, in the field of quality control, the essential quality determination of surface treatment processes such as painting and plating processes including degreasing is performed by general inspection at the production site after the process (for example, It is difficult to perform in appearance inspection etc. due to the characteristics of the process. For example, quality such as adhesion of a coating film cannot be judged only by appearance inspection as a nondestructive test. Therefore, these surface treatment processes are called special processes.

  In such a surface treatment process, unlike a process such as machining or assembly, for example, a water treatment (including chemical treatment) process is continuously performed on the production line. For this reason, factors such as temperature, chemical concentration, and time in each process are managed and maintained through daily inspections, etc., to ensure product quality.

  Therefore, in the process management method, it is determined whether or not the above-described factors in each process are within a predetermined condition, and the degree of degreasing is determined. However, since this method is not a method for directly inspecting products, it is impossible to directly determine the quality of the degree of degreasing by this method.

(2) Visual method This method is a sensitive inspection by human eyes. In this method, light is obliquely applied to the inspection surface of the metal plate, and the degree of reflection (reflection pattern) at that time is visually confirmed to determine the degreasing state. However, with this method, not only a quantitative determination cannot be made, but also the determination criteria vary depending on the person who makes the determination, so the reliability of the determination result is low. Furthermore, with this method, only the appearance of the product is determined, and the quality of the surface treatment itself cannot be determined.

JP-A-9-113231

  As described above, conventionally, various methods for measuring the degreasing state of a metal plate (inspection object) have been proposed. However, in this technical field, it is desired to develop a degreasing state measuring apparatus that can measure the degreasing state in a more local inspection region and can measure the degreasing state more stably and accurately. .

  The present invention has been made to meet the above demand. The object of the present invention is to measure the degreasing state in a more local inspection region, and to measure the degreasing state more stably and accurately, the degreasing state measuring system, and It is to provide a degreasing state measuring method.

  In order to solve the above problems, the degreasing state measuring device of the present invention comprises a light source, a spectroscopic element, a light receiving element, a condensing lens for excitation light, and a visible light detector. Configure as follows. The light source emits excitation light to the inspection object, and the spectroscopic element separates the excitation light emitted from the light source into transmitted excitation light and reflected excitation light. The light receiving element detects the reflected excitation light and outputs the detection result to a light output control circuit that feedback-controls the intensity of the excitation light. The excitation light condensing lens condenses the transmitted excitation light. The visible light detector detects visible light generated when the inspection object is irradiated with the transmitted excitation light, and outputs the detection result to a signal processing unit that generates information corresponding to the degreasing state of the inspection object. Output.

  The degreasing state measuring system of the present invention includes the above-described degreasing state measuring apparatus of the present invention and an information processing device, and the information processing device feedback-controls the intensity of excitation light based on the detection result of the light receiving element. Based on the detection result of the light output control circuit and the visible light detector, a signal processing unit that generates information corresponding to the degreased state of the inspection object is provided.

  Furthermore, the degreasing state measuring device of this invention is a degreasing state measuring method using the said degreasing state measuring device of the said invention, and performs it in the following procedure. First, the condensing lens for excitation light collects the transmitted excitation light and irradiates the inspection object with the transmitted excitation light. The light receiving element detects the reflected excitation light and outputs the detection result to a light output control circuit that feedback-controls the intensity of the excitation light. The visible light detector detects visible light generated when the inspection object is irradiated with transmitted excitation light, and the detection result is generated in a signal processing unit that generates information corresponding to the degreasing state of the inspection object. Output.

  In the present invention, the excitation light emitted from the light source is separated into transmitted excitation light and reflected excitation light by the spectroscopic element. In the present invention, the transmitted excitation light is collected by the excitation light condensing lens and irradiated to the inspection object. Therefore, a minute region (local region) can be irradiated with the excitation light, and the illuminance of the excitation light in that region can be increased. In the present invention, the reflected excitation light separated by the spectroscopic element is detected by the light receiving element, and the intensity of the excitation light is feedback controlled based on the detection result. Therefore, in the present invention, it is possible to irradiate the inspection object with excitation light (transmission excitation light) having a stable intensity.

  As described above, according to the present invention, the degreasing state can be measured in a local inspection region, and the degreasing state can be measured more stably and accurately.

It is a schematic block diagram of the degreasing state measuring device which concerns on one Embodiment of this invention. It is a circuit block block diagram of a signal processing part. It is a circuit block block diagram of a light output control part. It is a flowchart which shows the procedure of the measurement process of the degreasing state in the degreasing state measuring apparatus which concerns on one Embodiment of this invention. It is a schematic block diagram of the degreasing state measuring apparatus of a comparative example. It is a figure which shows the mode of the measurement example 1 by the degreasing state measuring apparatus of a comparative example. It is a figure which shows the mode of the measurement example 2 by the degreasing state measuring apparatus of a comparative example. It is a figure which shows the mode of the measurement example 3 by the degreasing state measuring apparatus of a comparative example. It is a schematic block diagram of the degreasing state measuring apparatus of the modification 1. It is a schematic block diagram of the degreasing state measuring apparatus of the modification 2. It is a schematic block diagram of the degreasing state measuring apparatus of the modification 3.

  Hereinafter, an embodiment of a degreasing state measuring apparatus and a degreasing state measuring method according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the following examples.

[Configuration of Degreasing State Measuring Device]
1A and 1B show a schematic configuration of a degreasing state measuring apparatus according to an embodiment of the present invention. Fig.1 (a) is AA sectional drawing in FIG.1 (b), FIG.1 (b) is a bottom view of the degreasing state measuring apparatus 10 seen from the test target (metal plate 200). . In the present embodiment, an example in which the inspection object is a metal plate 200 such as a steel plate will be described.

  The degreasing state measuring apparatus 10 includes a housing 1, four support legs 2 that support the housing 1, two excitation light output units 3, a fluorescence detection unit 4, and a processing circuit unit built in the housing 1. 5. Further, the degreasing state measuring device 10 (processing circuit unit 5) is electrically connected to an external display device 8, and the measurement result of the degreasing state measuring device 10 is output to the display device 8, and the display device 8 is The measurement result is displayed.

  As illustrated in FIGS. 1A and 1B, the housing 1 is configured by a substantially rectangular parallelepiped box member. In addition, the shape of the housing | casing 1 is not limited to this example, It can set arbitrarily. Further, the housing 1 can be constituted by, for example, an iron plate or the like, but the present invention is not limited to this, and the forming material of the housing 1 is appropriately determined in consideration of conditions such as required strength and weight. Can be set.

  In the present embodiment, as shown in FIG. 1B, the bottom plate portion 1a of the housing 1 (the plate portion on the emission side of the excitation light S) is on the optical path of each excitation light S (transmission excitation light), and The opening 1b and the opening 1c are provided on the optical path of the fluorescence Sf generated from the metal plate 200 (oil or fat).

  Moreover, in this embodiment, the fluorescence detection part 4 is provided in the baseplate part 1a vicinity of the housing | casing 1, and is arrange | positioned just above the irradiation position (oil-fat detection area | region D) of the excitation light S. FIG. Note that the height of the fluorescence detection unit 4 from the metal plate 200 can be arbitrarily set, but in terms of improving the detection sensitivity of the fluorescence Sf, the fluorescence detection is performed at a position closer to the metal plate 200. It is preferable to arrange the portion 4. Further, the arrangement position of the fluorescence detection unit 4 can be set to any position as long as the fluorescence generated from the oil and fat can be detected, and is arranged at a position shifted from immediately above the irradiation position of the excitation light S. Also good. However, from the viewpoint of improving the detection sensitivity of the fluorescence Sf, it is preferable to provide the fluorescence detection unit 4 immediately above the irradiation position of the excitation light S as shown in FIG.

  Furthermore, in the present embodiment, the two excitation light output units 3 are provided in the vicinity of the two opposing side plate portions 1d of the housing 1 (in the example of FIG. 1B, the narrower side plate portion 1d). It is done. At this time, as shown in FIG. 1A, the two excitation light output units 3 are arranged at symmetrical positions with respect to the fluorescence detection unit 4 and are arranged at the same height. Further, the two excitation light output units 3 are arranged so that the irradiation positions of the excitation lights S that are obliquely irradiated onto the metal plate 200 from the two excitation light output units 3 are the same position. The irradiation angle of the excitation light S can be set arbitrarily.

  The four support legs 2 are respectively provided at four corners of the bottom plate portion 1a of the housing 1 as shown in FIG. The four support legs 2 are attached to the bottom plate portion 1a of the housing 1 so that the length thereof can be adjusted. Moreover, in this embodiment, although each support leg 2 is comprised with a rod-shaped member, this invention is not limited to this, The shape of each support leg 2 can be set arbitrarily.

  In this embodiment, as shown to Fig.1 (a), when measuring the degreasing | defatting state of the metal plate 200 (inspection object), the edge on the opposite side to the housing | casing 1 side of the four support legs 2 is shown. The degreasing state measuring device 10 is placed on the metal plate 200 with the part in contact with the metal plate 200. That is, the degreasing state measuring device 10 is placed on the metal plate 200 via the four support legs 2 and the degreasing state of the metal plate 200 is measured. Therefore, in the degreasing state measuring apparatus 10 of the present embodiment, the oil / fat detection region D of the metal plate 200 is in a state (open state) that is visible from the outside during the inspection. In this case, for example, the focal position of the excitation light S can be visually confirmed and adjusted, and advantages such as improved usability can be obtained.

  In addition, in this embodiment, although the structural example which mounts the degreasing state measuring apparatus 10 on the metal plate 200 via the four support legs 2, the holding | maintenance (support) form of the degreasing state measuring apparatus 10 was shown. However, the present invention is not limited to this example. For example, the degreasing state measuring apparatus 10 may be configured to be held using a support member provided so as not to contact the metal plate 200 (for example, a support member fixed to a table or the like on which the metal plate 200 is placed). The degreasing state measuring device 10 may be suspended from a surrounding wall or ceiling to hold the degreasing state measuring device 10.

  Next, the structure of each part built in the housing | casing 1 is demonstrated.

(1) Configuration of Excitation Light Output Unit In the present embodiment, two excitation light output units 3 are provided, and the two excitation light output units 3 have the same configuration. Each excitation light output unit 3 collects and irradiates the excitation light S on a local oil detection region D on the surface of the metal plate 200. For example, each excitation light output unit 3 condenses and irradiates the excitation light S on the oil / fat detection region D having a diameter of about 5 mm to 10 mm. Thereby, the local oil-and-fat detection area | region D can be irradiated with the excitation light S of high illumination intensity. Further, as in the present embodiment, by providing a plurality of excitation light output units 3 (excitation light sources 11), the local fat / oil detection region D can be irradiated with excitation light S having stronger and more stable intensity. It is possible to improve the oil and fat detection sensitivity.

  The number of excitation light output units 3 (excitation light source 11 described later) is not limited to two, and only one excitation light output unit 3 may be provided, or three or more excitation light output units 3 may be provided. The number of the excitation light output units 3 is appropriately set in consideration of, for example, the size of the degreasing state measuring device 10 and the required sensitivity.

  Each excitation light output unit 3 includes an excitation light source 11 (light source), a spectroscopic element 12, a condensing lens 13 (excitation light condensing lens), a long wavelength cut filter 14, and a control light receiving element 15 (light receiving element). ). The spectroscopic element 12, the condenser lens 13, and the long wavelength cut filter 14 are arranged in this order along the optical path of the excitation light S on the output side of the excitation light source 11. The control light receiving element 15 is disposed on the optical path of a part of the emitted light from the excitation light source 11 (reflected excitation light) that is reflected (spectral) by the spectroscopic element 12.

  The excitation light source 11 is a light source of the excitation light S, and is composed of, for example, an ultraviolet light source having a wavelength of about 300 nm to 400 nm. When the excitation light source 11 is composed of an ultraviolet light source, the excitation light source 11 is composed of a light emitting element such as an LED (light emitting diode). The light emitted from the excitation light source 11 is not limited to ultraviolet light, and light having an arbitrary wavelength can be used as long as the light has a wavelength at which fluorescence is excited by the oil when the oil is irradiated with light.

  Although not shown in FIGS. 1A and 1B, the excitation light source 11 is electrically connected to a light output control unit 7 described later in the processing circuit unit 5 (see FIG. 3). In the present embodiment, the light emission intensity of the excitation light source 11 is feedback-controlled by the light output control unit 7.

  The spectroscopic element 12 is composed of an optical element such as a beam splitter or a half mirror. The spectroscopic element 12 transmits the light emitted from the excitation light source 11 (excitation light) to the condenser lens 13 side (transmission excitation light) and the light reflected (supplied) to the control light receiving element 15 side (reflection excitation). Separated into light). In the present embodiment, a spectroscopic element 12 that reflects, for example, about 10 to 20% of the light emitted from the excitation light source 11 to the control light receiving element 15 side is used.

  The condensing lens 13 condenses the excitation light S (transmission excitation light) transmitted through the spectroscopic element 12 and generates the excitation light S having a smaller spot diameter. The configuration of the condenser lens 13 (arrangement position, focal length, etc.) is set so that its focal point matches the local oil detection region D. Thereby, the excitation light S can be concentrated and irradiated to the oil detection region D, and the illuminance of the excitation light S in the oil detection region D can be increased.

  The long wavelength cut filter 14 removes a visible light component contained in the light emitted from the excitation light source 11. In the present embodiment, the long wavelength cut filter 14 is disposed in close contact with the light exit surface of the condenser lens 13. Thereby, it is possible to prevent leakage of visible light components unnecessary for the detection of oil and fat to the metal plate 200 side as much as possible, and more unnecessary visible light components included in the excitation light S irradiated on the metal plate 200 can be prevented. Can be reduced. FIG. 1 (a) shows an example in which the long wavelength cut filter 14 is disposed apart from the opening 1b provided in the bottom plate 1a of the housing 1, but the present invention is not limited to this. For example, the long wavelength cut filter 14 may be disposed so as to block the opening 1b of the bottom plate 1a with the long wavelength cut filter 14.

  The control light receiving element 15 is composed of a light receiving element such as a photodiode for detecting excitation light (ultraviolet light or the like), for example, detects light (reflected excitation light) supplied from the spectroscopic element 12, and uses the detected light as an electrical signal. Convert to The control light receiving element 15 is electrically connected to a light output control unit 7 described later in the processing circuit unit 5, and outputs the converted electric signal (detection result) to the light output control unit 7.

(2) Configuration of Fluorescence Detection Unit The fluorescence detection unit 4 detects fluorescence Sf (visible light) emitted by oils and fats attached to the metal plate 200. The fluorescence detection unit 4 includes a condensing lens 21 (condensing lens for visible light), a short wavelength cut filter 22, and a visible light detector 23. The short wavelength cut filter 22 and the condenser lens 21 are arranged in this order along the light path of the fluorescence Sf on the light receiving surface side of the fluorescence Sf of the visible light detector 23 (incident surface side of the fluorescence Sf).

  The condensing lens 21 condenses the fluorescence Sf generated in the oil / fat detection region D of the metal plate 200. In the present embodiment, the configuration (arrangement position, focal length, etc.) of the condensing lens 21 is set so that the focal point thereof matches the local oil detection region D. In addition, the dimension of the condensing lens 21 is suitably set considering the dimension of the degreasing state measuring apparatus 10 etc., for example. FIG. 1A shows an example in which the condenser lens 21 is arranged apart from the opening 1c provided in the bottom plate 1a of the housing 1, but the present invention is not limited to this, for example, The condensing lens 21 may be disposed so that the opening 1c of the bottom plate portion 1a is covered with the condensing lens 21.

  By providing the condensing lens 21 having the above configuration on the light receiving surface side of the visible light detector 23, the fluorescence Sf generated by the oil and fat can be efficiently condensed and guided to the visible light detector 23. Therefore, in the present embodiment, it is possible to further improve the detection sensitivity of the fluorescence Sf generated by the fats and oils. For example, when the number of the excitation light output units 3 (excitation light sources 11) can be increased and the fluorescence Sf having a sufficiently strong light power can be generated with oils and fats, the condenser lens 21 may not be provided.

  The short wavelength cut filter 22 removes unnecessary light components of the excitation light S (for example, ultraviolet rays) that leaks into the visible light detector 23. In this embodiment, the short wavelength cut filter 22 is disposed in close contact with the light receiving surface of the visible light detector 23. Thereby, unnecessary leakage of the excitation light S to the visible light detector 23 can be prevented as much as possible.

  In the present embodiment, as described above, an example in which interference filters (the long wavelength cut filter 14 and the short wavelength cut filter 22) are used to remove unnecessary light components (visible light component and excitation light component) has been described. However, the present invention is not limited to this. For example, a small spectroscope may be used instead of the interference filter. In addition, when the above-described unnecessary light components (visible light component and excitation light component) do not significantly affect the detection of fluorescent components generated in fats and oils (measurement of a degreased state), the long wavelength cut filter 14 and the short wavelength filter 14 The wavelength cut filter 22 may not be provided.

  The visible light detector 23 is composed of a light receiving element such as a visible light detection photodiode, for example. The visible light detector 23 receives the fluorescence Sf generated in the oil / fat detection region D of the metal plate 200 via the condenser lens 21 and the short wavelength cut filter 22, and converts the received fluorescence Sf into an electric signal. The visible light detector 23 is electrically connected to a signal processing unit 6 (described later) in the processing circuit unit 5, and outputs the converted electric signal (detection result) to the signal processing unit 6.

(3) Configuration of Processing Circuit Unit The processing circuit unit 5 is a circuit unit for driving various operations of the degreasing state measuring apparatus 10. In the present embodiment, the signal processing unit 6 and the light output control unit 7 are mounted on the processing circuit unit 5. Although not shown in FIG. 1A, the processing circuit unit 5 also includes a power supply circuit for driving each circuit unit.

(3-1) Signal Processing Unit The signal processing unit 6 uses information (detection signal) corresponding to the degreasing state of the oil / fat detection region D of the metal plate 200 based on the detection result of the fluorescence Sf input from the visible light detector 23. ) Is generated. Here, FIG. 2 shows an internal block configuration of the signal processing unit 6.

  The signal processing unit 6 includes a bandpass filter 31, a first amplifier circuit 32, a rectangular wave oscillation circuit 33, a synchronous detection circuit 34, a zero point adjustment circuit 35, and a second amplifier circuit 36. The band-pass filter 31, the first amplifier circuit 32, the synchronous detection circuit 34, the zero point adjustment circuit 35, and the second amplifier circuit 36 are electrically connected in this order from the detection result input side of the visible light detector 23. Connected to. Further, the output terminal of the rectangular wave oscillation circuit 33 is connected to the synchronous detection circuit 34, and the output terminal of the second amplification circuit 36 is connected to the external display device 8.

  The bandpass filter 31 removes unnecessary electrical noise from the detection signal detected by the visible light detector 23. Specifically, the band pass filter 31 passes a signal component in a band near the frequency of the rectangular wave current that drives the excitation light source 11 and outputs the signal to the first amplifier circuit 32.

  The first amplifier circuit 32 amplifies the signal in the predetermined frequency band extracted by the bandpass filter 31 and outputs the amplified signal (periodic signal) to the synchronous detection circuit 34.

  The rectangular wave oscillating circuit 33 generates a rectangular wave signal (for example, a rectangular wave signal of about 1 kHz) that is synchronized with the drive signal (AC current signal) supplied to the excitation light source 11, and the rectangular wave signal is synchronized with the synchronous detecting circuit 34. Output to.

  The synchronous detection circuit 34 performs synchronous detection using the periodic signal input from the first amplifier circuit 32 and the rectangular wave signal input from the rectangular wave oscillation circuit 33, and converts the input periodic signal into a DC signal. Convert. Then, the synchronous detection circuit 34 outputs the converted DC signal to the zero point adjustment circuit 46. The level of the DC signal output from the synchronous detection circuit 34 is a value corresponding to the amount of visible light (including fluorescence Sf) detected by the visible light detector 23.

  In the degreasing state measuring apparatus 10 of the present embodiment, the excitation light output unit 3 is provided with the long wavelength cut filter 14, and the fluorescence detection unit 4 is provided with the short wavelength cut filter 22 to enter the visible light detector 23. The unnecessary visible light component (visible light component included in the light emitted from the excitation light source 11) is removed as much as possible, but the unnecessary visible light component cannot be completely removed. Therefore, the visible light detected by the visible light detector 23 includes some unnecessary visible light components. In the configuration of the present embodiment, there is an influence such as drift in the circuit of the signal processing unit 6. That is, the DC signal output from the synchronous detection circuit 34 is a signal including an influence (error) such as a minute amount of unnecessary visible light components and drift in the circuit of the signal processing unit 6.

  Therefore, in the present embodiment, a zero point adjustment circuit 35 is provided on the output side of the synchronous detection circuit 34, and this circuit corrects the above-described error, and a signal corresponding to the fluorescence Sf generated in the oil and fat (the oil and fat of the metal plate 200). Information corresponding to the degreasing state of the detection region D) is extracted with higher accuracy.

  Specifically, the zero point adjustment circuit 35 performs the following correction process. First, the value of the direct current signal when no oil or fat is present at the irradiation position of the excitation light S (oil and fat detection region D) is measured in advance, and the value is set as a zero-level reference value of the direct current signal. Then, the DC signal input from the synchronous detection circuit 34 is corrected by adjusting the zero level of the DC signal input from the synchronous detection circuit 34 to the reference value of the zero level of the DC signal calculated in advance. As a result, only the DC signal corresponding to the fluorescence Sf generated by the oil and fat can be output from the zero point adjustment circuit 35. Then, the zero point adjustment circuit 35 outputs a DC signal corresponding to the extracted fluorescence Sf to the second amplification circuit 36.

  Note that the synchronous detection circuit 34 is used when an error caused by the above-described minute amount of unnecessary visible light component or drift in the circuit of the signal processing unit 6 does not greatly affect the detection of the fluorescence Sf generated by the oil or fat. The direct current signal output from the first amplifier circuit 36 may be directly output to the second amplifier circuit 36 without being corrected.

  The second amplification circuit 36 performs gain adjustment on the DC signal output from the zero point adjustment circuit 35 and amplifies it. Then, the second amplifier circuit 36 outputs the amplified DC signal to the display device 8.

  The display device 8 converts the DC signal (oil detection result) input from the second amplifier circuit 36 into a voltage signal and displays it. At this time, the display form of the numerical value may be an analog display or a digital display. Based on the display result, the user determines whether or not the oil / fat is attached to the oil / fat detection region D of the metal plate 200. In the present embodiment, a determination unit is provided in the signal processing unit 6 to determine whether or not the oil / fat is attached to the oil / fat detection region D of the metal plate 200 based on the output signal of the second amplifier circuit 36. May be. In this case, the display device 8 may display only the presence / absence (determination result) of the adhesion of oil and fat.

(3-2) Light Output Control Unit The light output control unit 7 uses the light from the excitation light source 11 based on the detection result of the light reflected by the spectroscopic element 12 detected by the control light receiving element 15 (reflection excitation light). The output (intensity of the excitation light S) is feedback controlled. Here, FIG. 3 shows an internal block configuration of the light output controller 7.

  The light output control unit 7 includes an amplifier circuit 41, a PID (Proportional / Integral / Derivative) control unit 42, and an LED DC power supply 43.

  The amplification circuit 41 is electrically connected to the control light receiving element 15 and converts an alternating electrical signal (periodic signal) corresponding to the reflected excitation light detected by the control light receiving element 15 into a direct current signal. Amplifies the received DC signal. The amplifier circuit 41 is connected to the PID control unit 42 and outputs the amplified DC signal (process signal) to the PID control unit 42.

  The PID control unit 42 combines the proportional control, the integral control, and the derivative control, and the operation signal of the LED DC power source 43 is converged so that the process signal input from the amplifier circuit 41 converges to a predetermined set value. (Control signal) is generated. Specifically, the process signal input from the amplifier circuit 41 is compared with a predetermined setting value set in advance, and an operation signal corresponding to the comparison result is generated.

  The PID control unit 42 is connected to the LED DC power source 43, outputs the generated operation signal (control signal) to the LED DC power source 43, and the intensity of the excitation light S (the light output of the excitation light source 11) becomes an optimum value. Control to be. In the present embodiment, while the excitation light S is emitted from the excitation light source 11, PID control is repeatedly performed. As a method for controlling the intensity of the excitation light S, a technique other than the PID control can be used. As with the PID control, any control can be used as long as the intensity of the excitation light S can be feedback controlled. Techniques can be used.

  The LED DC power supply 43 is a current source of the excitation light source 11 and supplies a drive signal (current signal) having a predetermined current value to the excitation light source 11 based on an operation signal input from the PID control unit 42.

  In the present embodiment, a circuit set of the amplification circuit 41, the PID control unit 42, and the LED DC power source 43 in the light output control unit 7 is provided for each excitation light source 11 (excitation light output unit 3). In this case, since the intensity of the excitation light S of each excitation light source 11 can be individually controlled with high accuracy, the oil / fat detection accuracy is also improved. The present invention is not limited to this, and the circuit configuration of the amplifier circuit 41, the PID control unit 42, and the LED DC power supply 43 may be provided in common for the plurality of excitation light sources 11 to further simplify the apparatus configuration. . In this case, for example, the PID control unit 42 compares the process signal generated based on the average value of the alternating electrical signal detected by each control light receiving element 15 with each excitation light. The intensity of S can be feedback controlled.

[Operation of degreasing state measuring device]
Next, the detection operation of the degreasing state in the degreasing state measuring apparatus 10 of this embodiment is demonstrated, referring FIG. In addition, FIG. 4 is a flowchart which shows the procedure of the detection process of the degreasing state in the degreasing state measuring apparatus 10 of this embodiment.

  First, the degreasing state measuring apparatus 10 causes the two excitation light sources 11 to emit light, and obliquely irradiates the surface of the metal plate 200 with light of a predetermined wavelength (for example, ultraviolet rays) from each excitation light source 11 (step S1). At this time, in the present embodiment, each excitation light S transmitted through each spectroscopic element 12 is condensed by the corresponding condenser lens 13, and each condensed excitation light S is given to a predetermined local area on the surface of the metal plate 200. Irradiated to a typical oil and fat detection region D.

  Next, the control light receiving element 15 detects the light (reflected excitation light) reflected from the spectroscopic element 12 while the excitation light S is irradiated on the metal plate 200. The light output controller 7 optimizes the light output of the excitation light source 11 (intensity of the excitation light S) by PID control based on the detection result of the control light receiving element 15 (step S2). Note that the feedback control process of the intensity of the excitation light S in step S2 is repeatedly performed while the excitation light S is irradiated on the metal plate 200.

  Next, the visible light detector 23 detects visible light (fluorescence Sf) generated in the oil / fat detection region D by irradiating the oil / fat detection region D with the excitation light S, and performs signal processing on the detected signal (detection result). It outputs to the part 6 (step S3).

  Next, the signal processing unit 6 (zero point adjustment circuit 35) affects the above-described minute amount of unnecessary visible light components included in the signal detected by the visible light detector 23, drift in the circuit of the signal processing unit 6, and the like. (Error) is removed (zero point adjustment is performed), and the detection signal of the visible light detector 23 is corrected (step S4). In the present embodiment, information corresponding to the degreased state is generated by this process.

  Next, the signal processing unit 6 outputs the fat and oil detection signal corrected by the zero point adjustment circuit 35 to the external display device 8. And the display apparatus 8 displays the detection result (information corresponding to a degreasing state) of the fats and oils output from the signal processing part 6, and a user is on the fats and oil detection area | region D of the metal plate 200 based on the display result. It is determined whether or not oil or fat is adhered to the surface (step S5). In this embodiment, in this way, it is determined whether oil or fat is attached to the surface of the metal plate 200.

  In the degreasing state measuring apparatus 10 according to the present embodiment, as described above, the plurality of excitation lights S are collected by the condensing lens and irradiated to the local oil detection area D of the metal plate 200. Thereby, the excitation light S with stronger light power can be irradiated to the local oil detection region D, and the light power of the fluorescence Sf generated by the oil can be increased. Moreover, in this embodiment, since the optical output of each excitation light source 11 is individually PID-controlled, it is possible to stably irradiate the fat and oil detection region D with the excitation light S having the optimum intensity. That is, in the degreasing state measuring apparatus 10 of this embodiment, a trace amount of fats and oils can be detected in the more local fat and oil detection region D, and the degreasing state can be measured more stably and accurately.

  In addition, although the said embodiment demonstrated the example aiming at detecting a trace amount fats and oils, this invention is not limited to this. The degreasing state measuring apparatus and the degreasing state measuring method of the present invention can also be applied to the detection of an amount of fat (not an extremely small amount) that can be detected by a conventional method for detecting fats and oils. Moreover, in the said embodiment, although the metal plate 200, such as a steel plate, was mentioned as an example and demonstrated as an inspection target object of the degreasing state measuring apparatus 10, this invention is not limited to this. The degreasing state measuring apparatus 10 of the said embodiment is applicable also to test objects, such as a processed steel plate (electrogalvanized steel plate etc.), for example, and the same effect is acquired.

[Description of comparative examples and various effects]
Here, the effect obtained with the degreasing state measuring apparatus 10 of this embodiment mentioned above is demonstrated more concretely, comparing with the degreasing state measuring apparatus of the comparative example shown below.

  The present inventors have previously proposed a degreasing state measuring device for detecting a small amount of oil and fat in a state where the oil and fat detection region is sealed in Japanese Patent Application No. 2010-248392. 5A and 5B are schematic configuration diagrams of a sealed degreasing state measuring device (comparative example) proposed in Japanese Patent Application No. 2010-248392. 5A is a schematic cross-sectional view of a comparative degreasing state measuring apparatus 100, and FIG. 5B is an oil and fat sealed (defined) by the mirror 103 of the degreasing state measuring apparatus 100. It is a figure which shows the range of the detection area Dr.

  The degreasing state measuring apparatus 100 of the comparative example includes an excitation light output unit 101, a fluorescence detection unit 102, and a bowl-shaped mirror 103. The excitation light output unit 101 is attached to the side surface of the mirror 103, and the fluorescence detection unit 102 is attached to the apex of the mirror 103.

  The excitation light output unit 101 includes an excitation light source 111 (ultraviolet light source) and a long wavelength cut filter 112, and the fluorescence detection unit 102 includes a condenser lens 121, a short wavelength cut filter 122, and a visible light detector 123. It consists of. The excitation light source 111 and the long wavelength cut filter 112 in the excitation light output unit 101 are configured in the same manner as the excitation light source 11 (LED) and the long wavelength cut filter 14 of the excitation light output unit 3 of the present embodiment, respectively. The Further, the condensing lens 121, the short wavelength cut filter 122, and the visible light detector 123 in the fluorescence detection unit 102 are the condensing lens 21, the short wavelength cut filter 22, and the visible light detector 123 of the fluorescence detection unit 4 of the present embodiment, respectively. The configuration is the same as that of the photodetector 23.

  In the degreasing state measuring device 100 of the comparative example, the opening of the bowl-shaped mirror 103 is placed on the metal plate 201 so that the oil / fat detection region of the metal plate 201 is sealed. In the comparative example, since the excitation light S is not collected when the excitation light S is applied to the metal plate 201, the entire region Dr defined by the opening of the mirror 103 is the oil detection region (hereinafter referred to as oil detection). This is referred to as a region Dr).

  In the comparative example, the degreasing state is measured by irradiating the metal plate 201 with excitation light S (ultraviolet light) at an incident angle of Brewster angle from the excitation light source 111 in a state where the oil and fat detection region Dr is sealed. However, in this case, since the excitation light S is not collected in the comparative example, the amount of detected oil (fluorescence Sf) is an average value of the amount of oil remaining in the oil detection region Dr. Further, in the degreasing state measuring apparatus 100 of the comparative example, the diameter of the oil / fat detection region Dr is about 100 mm due to physical restrictions such as the number and size of the excitation light sources 111 and the size of the visible light detector 123. . Therefore, in the comparative example, the average value of the amount of oil remaining on the surface of the metal plate 201 in the oil detection region Dr having a diameter of about 100 mm is measured.

  In the degreasing state measuring apparatus 100 of the comparative example described above, in the following various measurement examples (measurement examples 1 to 3), the oil and fat detection accuracy may be lowered.

(1) Measurement example 1
FIGS. 6A and 6B show the state of Measurement Example 1. FIG. 6A is a diagram illustrating an operation state of the degreasing state measuring apparatus 100 in the measurement example 1, and FIG. 6B is a diagram illustrating a range of the oil / fat detection region Dr sealed by the mirror 103. It is.

  The measurement example 1 is a measurement example when the degreasing state of the metal plate 202 having a surface area of about 20 mm × 20 mm is detected by the degreasing state measuring device 100 of the comparative example. That is, in Measurement Example 1, as shown in FIGS. 6A and 6B, the surface area of the metal plate 202 serving as the inspection object is smaller than the area of the oil and fat detection region Dr sealed by the mirror 103. In such a case, the oil / fat detection region Dr includes not only the surface region of the metal plate 202 but also a region where it is not necessary to measure the degreasing state. Therefore, when the degreasing state is measured in the situation as in Measurement Example 1, the measurement result includes the measurement result of the degreasing state in the region where it is not necessary to measure the degreasing state. Detection accuracy decreases.

(2) Measurement example 2
7A and 7B show the state of Measurement Example 2. FIG. 7A is a diagram illustrating an operation state of the degreasing state measuring apparatus 100 in the measurement example 2, and FIG. 7B is a diagram illustrating the range of the oil / fat detection region Dr sealed by the mirror 103. It is.

  The measurement example 2 is a measurement example in the case where the degreasing state of the metal plate 203 having an opening formed on a part of the surface is detected by the degreasing state measuring device 100 of the comparative example. In measurement example 2, a case is considered where the range of the surface area of the entire metal plate 203 is larger than the oil / fat detection area Dr sealed by the mirror 103. In measurement example 2, as shown in FIGS. 7A and 7B, an example in which four openings 203 a are formed in an array form of 2 rows × 2 columns in the vicinity of the center of the metal plate 203. Show.

  In the measurement example 2, as shown in FIGS. 7A and 7B, not only the surface area of the metal plate 203 but also the areas of the four openings 203a that do not need to measure the degreasing state in the oil detection area Dr. Is also included. Therefore, when the degreasing state is measured in the situation as in Measurement Example 2, the measurement result includes the measurement result of the degreasing state in the region of the four openings 203a that does not need to be measured. Thus, the detection accuracy of the degreased state decreases.

(3) Measurement example 3
8A and 8B show the state of Measurement Example 3. FIG. 8A is a diagram illustrating an operation state of the degreasing state measuring apparatus 100 in the measurement example 3, and FIG. 8B is a diagram illustrating the range of the oil / fat detection region Dr sealed by the mirror 103. It is.

  In the measurement example 3, the degreasing state of the metal plate 204 in which the oil and fat 205 are locally scattered and adhered to the surface of the metal plate, and the amount of the oil and fat 205 is nonuniform on the surface of the metal plate is the degreasing state of the comparative example. It is an example of a measurement in the case of detecting with the measuring device 100. In measurement example 3, a case is considered where the range of the surface area of the entire metal plate 204 is larger than the oil / fat detection area Dr sealed by the mirror 103.

  In the measurement example 3, since the average value of the measurement result of the region where the oil 205 is attached and the measurement result of the region where the oil 205 is not attached is measured, the detection accuracy of the degreasing state on the metal plate 204 is high. descend.

  As described above, in the degreasing state measuring apparatus 100 of the comparative example, the measurement accuracy of the degreasing state may be lowered depending on conditions such as the size of the inspection object (metal plate), the surface shape, and the state of oil adhesion.

  On the other hand, in the degreasing state measuring apparatus 10 of the present embodiment, the excitation light S is collected by the condenser lens 13 and irradiated to the inspection object (metal plate). ) Can be detected. Therefore, in the degreasing state measuring apparatus 10 of the present embodiment, the excitation light S can be irradiated only to the region where the degreasing state is to be measured even in the situation shown in the measurement examples 1 to 3, and the degreasing is more accurately performed. The state can be measured. Furthermore, in the degreasing state measuring apparatus 10 of this embodiment, since the excitation light S is condensed and irradiated onto the inspection object, it is possible to irradiate the excitation light S with stronger light power than the comparative example, The light power of the fluorescence Sf generated by the oil can be increased. Therefore, in this embodiment, it is possible to improve the detection sensitivity of the degreased state as compared with the comparative example.

  Moreover, although not only the degreasing state measuring apparatus 100 of a comparative example but also in this embodiment, although an excitation light source is comprised with LED, since LED is formed with the semiconductor, the emitted light intensity of LED depends on the surrounding temperature change. Change. Further, since the LED itself generates heat while the LED is being driven, the temperature of the LED (light source) increases as the usage time of the LED increases, thereby changing the emission intensity of the LED. For example, although it differs depending on the type of LED, when the temperature of the LED increases by 10 ° C., the emission intensity decreases by about 10%, for example.

  In addition, since the temperature of the LED does not simply rise and fall, its emission intensity also becomes unstable. For example, if the excitation light quantity to be irradiated is UV and the fluorescence amount generated by fats and oils is VL, a relationship of VL = η × UV is established between the two, so that the emission intensity of the LED becomes unstable, The amount of fluorescence generated by fats and oils also becomes unstable. Therefore, when the LED is used for a long time, the light emission intensity of the LED becomes unstable due to the influence of the ambient temperature and self-heating, and it becomes difficult to detect a small amount of oil and fat stably. Note that it is usually difficult to keep the temperature of the LED constant even if measures against heat radiation are applied to the LED.

  On the other hand, in the degreasing state measuring apparatus 10 of this embodiment, the spectroscopic element 12 extracts part of the light (reflected excitation light) emitted from the excitation light source 11, and the excitation light S is based on the extracted light. The drive current of the excitation light source 11 is feedback-controlled so that the intensity (the emission intensity of the excitation light source 11) becomes the optimum intensity. Therefore, in the degreasing state measuring apparatus 10 of the present embodiment, the influence of the ambient temperature of the excitation light source 11 and self-heating can be suppressed, and the excitation light S having the optimum intensity is always detected as the inspection object (metal plate). Can be irradiated. That is, in the present embodiment, the inspection object (metal plate) can be stably irradiated with the excitation light S having the optimum intensity.

[Variations]
Next, various modifications of the degreasing state measuring device 10 of the above-described embodiment will be described.

(1) Modification 1
In the said embodiment, although the open-type degreasing state measuring apparatus 10 was demonstrated, this invention is not limited to this, The structure of the excitation light output part 3, the fluorescence detection part 4, and the processing circuit part 5 of the said embodiment is as follows. You may apply to a sealed-type degreasing state measuring apparatus.

  FIG. 9 shows an example of the configuration (Modification 1). FIG. 9 is a schematic configuration diagram of the degreasing state measuring apparatus according to the first modification. Moreover, in the degreasing state measuring apparatus 50 of the modification 1 shown in FIG. 9, the same code | symbol is attached | subjected and shown to the structure same as the structure of the degreasing state measuring apparatus 10 of the said embodiment shown to Fig.1 (a).

  The degreasing state measuring device 50 includes a housing 51 and two excitation light output units 3, a fluorescence detection unit 4, and a processing circuit unit 5 that are built in the housing 51. As is clear from a comparison between FIG. 9 and FIG. 1A, in the first modification, the support leg 2 of the housing 1 of the above embodiment is omitted, and instead the degreasing state measuring device 50 is performed by the housing 51. A configuration that supports Since the other configuration of the modification 1 is the same as the corresponding configuration of the above embodiment, only the casing 51 will be described here.

  The housing | casing 51 is comprised by the substantially rectangular parallelepiped box member. In this example, the extension length of the side plate portion of the casing 51 is made longer than that of the casing 1 of the above embodiment, and the entire bottom portion on the emission side of the excitation light S of the casing 51 is an opening. To do. And in this example, when measuring the degreasing state of the metal plate 200, as shown in FIG. 9, the bottom part by the side of the opening part of the housing | casing 51 is made to contact the metal plate 200 directly, and a degreasing state measuring device is used. 50 is placed on the metal plate 200. As a result, the oil / fat detection region D of the metal plate 200 is sealed inside the housing 51.

  In this example, since the degreasing state measuring device 50 includes the excitation light output unit 3, the fluorescence detection unit 4, and the processing circuit unit 5 having the same configuration as that of the above embodiment, the same effects as those of the above embodiment can be obtained. Moreover, in this example, since the degreasing state can be measured with the oil and fat detection region D sealed, the influence of light entering the oil and fat detection region D from the outside can be reduced.

(2) Modification 2
In the above embodiment, the example in which the display device 8 is provided outside the degreasing state measuring device 10 has been described. However, the present invention is not limited to this, and the display device 8 may be provided inside the degreasing state measuring device. Good.

  FIG. 10 shows an example of the configuration (Modification 2). FIG. 10 is a schematic configuration diagram of a degreasing state measuring apparatus according to the second modification. Moreover, in the degreasing state measuring apparatus 60 of the modification 2 shown in FIG. 10, the same code | symbol is attached | subjected and shown to the structure same as the structure of the degreasing state measuring apparatus 10 of the said embodiment shown to Fig.1 (a).

  The degreasing state measuring device 60 includes a housing 1, four support legs 2 that support the housing 1, two excitation light output units 3, a fluorescence detection unit 4, and a processing circuit unit built in the housing 1. 5 and a display device 8. As is clear from a comparison between FIG. 10 and FIG. 1A, the second modification has a configuration in which the display device 8 is provided in the housing 1 of the degreasing state measuring device 10 of the above embodiment. The other configuration of the second modification is the same as the corresponding configuration in the above embodiment.

  Also in this example, since the degreasing state measuring device 60 includes the excitation light output unit 3, the fluorescence detection unit 4, and the processing circuit unit 5 having the same configuration as the above embodiment, the same effect as the above embodiment can be obtained. In addition, in this example, although the example which provided the display apparatus 8 in the housing | casing 1 of the degreasing state measuring apparatus 10 of the said embodiment was demonstrated, this invention is not limited to this and demonstrated in the said modification 1. The display device 8 may be provided in the housing 51 of the sealed degreasing state measuring device 50.

(3) Modification 3
In the above embodiment, an example in which the processing circuit unit 5 is provided in the degreasing state measuring apparatus 10 and the detection process of the fluorescence Sf (visible light) and the feedback control process of the excitation light source 11 are performed inside the degreasing state measuring apparatus 10. Although described, the present invention is not limited to this. The fluorescence Sf (visible light) detection process and the emission intensity feedback control process of the excitation light S may be performed by an external information processing apparatus. That is, the function of the processing circuit unit 5 may be provided outside the degreasing state measuring device.

  FIG. 11 shows an example of the configuration (Modification 3). In addition, FIG. 11 is a schematic configuration diagram of a degreasing state measurement system including the degreasing state measurement device of Modification 3. Moreover, in the degreasing state measuring system 70 of the modification 3 shown in FIG. 11, the same code | symbol is attached | subjected and shown to the structure same as the structure of the degreasing state measuring apparatus 10 of the said embodiment shown to Fig.1 (a).

  The degreasing state measuring system 70 of this example includes a degreasing state measuring device 71 and an information processing device 72.

  The degreasing state measuring device 71 includes a housing 1, four support legs 2 that support the housing 1, and two excitation light output units 3 and a fluorescence detection unit 4 that are built in the housing 1. The configuration of the case 1, the support leg 2, each excitation light output unit 3, and the fluorescence detection unit 4 in this example is the same as those in the above embodiment.

  The information processing device 72 includes a processing circuit unit 5 including a signal processing unit 6 and a light output control unit 7, and a display device 8. The configurations of the processing circuit unit 5 and the display device 8 are the same as those in the above embodiment. The information processing device 72 can be configured by, for example, a personal computer or a dedicated information processing terminal.

  In the degreasing state measurement system 70 of this example, the visible light detector 23 in the fluorescence detection unit 4 of the degreasing state measurement device 71 and the control light receiving element 15 in each excitation light output unit 3 are each an information processing device. 72 is electrically connected to the signal processing unit 6 and the light output control unit 7. Although not shown in FIG. 11, the excitation light source 11 in each excitation light output unit 3 of the degreasing state measuring device 71 is electrically connected to the light output control unit 7 in the information processing device 72.

  Also in the degreasing state measuring system 70 of this example, the oil and fat state can be detected in the same manner as the degreasing state measuring apparatus 10 of the above embodiment. Therefore, also in the degreasing state measuring system 70 of this example, the same effect as the above embodiment can be obtained. In this example, the example in which the degreasing state measuring device 71 is configured as an open type device has been described. However, the present invention is not limited thereto, and the degreasing state measuring device 71 is hermetically sealed as in the first modification. You may comprise by the apparatus of.

  DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Support leg, 3 ... Excitation light output part, 4 ... Fluorescence detection part, 5 ... Processing circuit part, 6 ... Signal processing part, 7 ... Light output control part, 8 ... Display part, 10 ... Degreasing State measuring device, 11 ... excitation light source, 12 ... spectral element, 13 ... condensing lens, 14 ... long wavelength cut filter, 15 ... control light receiving element, 21 ... condensing lens, 22 ... short wavelength cut filter, 23 ... visible Photodetector, 200 ... metal plate

Claims (13)

A light source that emits excitation light to the inspection object;
A spectroscopic element that separates the excitation light emitted from the light source into transmitted excitation light and reflected excitation light;
A light receiving element that detects the reflected excitation light and outputs the detection result to a light output control circuit that feedback-controls the intensity of the excitation light;
A condensing lens for excitation light that condenses the transmitted excitation light;
Visible light detection that detects visible light generated when the inspection object is irradiated with the transmitted excitation light and outputs the detection result to a signal processing unit that generates information corresponding to the degreasing state of the inspection object And a degreasing state measuring device. Further, based on the detection result of the light receiving element, the light output control circuit that feedback controls the intensity of the excitation light,
The degreasing state measuring device according to claim 1, further comprising: the signal processing unit that generates information corresponding to a degreasing state of the inspection object based on a detection result of the visible light detector. The degreasing state measuring apparatus according to claim 2, wherein the light output control circuit feedback-controls the intensity of the excitation light by PID control. 2. A visible light condensing lens that condenses visible light generated when the transmission object is irradiated with the transmitted excitation light and guides the collected visible light to the visible light detector. The degreasing state measuring device according to 1. Furthermore, a long wavelength cut filter provided at the light exit of the light source for removing light of visible light components,
The degreasing state measuring apparatus according to claim 1, further comprising: a short wavelength cut filter that is provided at a light incident port of the visible light detector and removes light having a wavelength component of the excitation light. The degreasing state measuring apparatus according to claim 1, wherein the excitation light is ultraviolet light. The degreasing state measuring apparatus according to claim 1, wherein a diameter of an irradiation region of the transmission excitation light of the inspection object is 5 mm to 10 mm. A plurality of excitation light output units including the light source, the spectroscopic element, the light receiving element, and the excitation light condenser lens;
The degreasing state measurement apparatus according to claim 1, wherein an irradiation position of the transmitted excitation light irradiated to the inspection object from each excitation light output unit is the same position. The degreasing state measuring apparatus according to claim 1, wherein the visible light detector is disposed immediately above the irradiation position of the transmission excitation light of the inspection object. The degreasing state measuring apparatus according to claim 1, wherein an irradiation position of the transmission excitation light of the inspection object is in an open state. Further, the light source, the spectroscopic element, the light receiving element, the excitation light condensing lens, and a housing containing the visible light detector,
The degreasing state measuring apparatus according to claim 1, wherein an irradiation position of the transmitted excitation light is sealed by the housing. A light source that emits excitation light to the inspection object, a spectroscopic element that separates the excitation light emitted from the light source into transmitted excitation light and reflected excitation light, and the reflected excitation light, and the detection result is Light-receiving element that outputs to a light output control circuit that feedback-controls the intensity of excitation light, a condensing lens for excitation light that condenses the transmitted excitation light, and generated when the inspection object is irradiated with the transmitted excitation light A degreasing state measuring device having a visible light detector that detects visible light and outputs the detection result to a signal processing unit that generates information corresponding to the degreasing state of the inspection object;
Based on the detection result of the light receiving element, the light output control circuit that feedback-controls the intensity of the excitation light and the detection result of the visible light detector correspond to the degreasing state of the inspection object. A degreasing state measurement system comprising: an information processing device including the signal processing unit that generates information. A light source that emits excitation light to the inspection object, a spectroscopic element that separates the excitation light emitted from the light source into transmitted excitation light and reflected excitation light, a light receiving element that detects the reflected excitation light, and the transmission excitation The condensing lens for excitation light of a degreasing state measuring device having a condensing lens for excitation light for condensing light and a visible light detector for detecting visible light generated in the inspection object is the transmission excitation. Condensing light and irradiating the inspection object with the transmitted excitation light;
The light receiving element detects the reflected excitation light, and outputs the detection result to a light output control circuit that feedback-controls the intensity of the excitation light;
Signal processing in which the visible light detector detects visible light generated when the inspection object is irradiated with the transmission excitation light, and the detection result generates information corresponding to the degreasing state of the inspection object A degreasing state measuring method including:

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