JP2015108508A - Non-destructive measurement apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-destructive measurement apparatus capable of measuring an organism component concentration of a target analyte while reduced in size and thickness, and of measuring an organism component concentration distribution of the target analyte.SOLUTION: The non-destructive measurement apparatus comprises: a light emission part 7 irradiating a target analyte as a measuring object with light; a light-receiving part 42 receiving reflectance or diffusion light emitted from the target analyte; a plurality of optical filters 62 causing light having a specific optical characteristic of the light received by the light-receiving part, to pass therethrough; an integrally formed optical waveguide 8 guiding the light received by the light-receiving part to the plurality of optical filters; a light-receiving element 61 detecting light having the specific optical characteristic passing through each optical filter part; and processing means 5 for calculating an evaluation amount of the target analyte from an analytical curve by detected reflectance or diffusion light.

Description

  The present invention relates to an apparatus for measuring an internal characteristic value and distribution thereof without destroying a subject.

  As an apparatus for measuring characteristics of an object such as fruit and vegetables without destroying the object, there is a light transmission type measuring apparatus that receives light transmitted through the fruit and vegetables and measures the absorbance absorbed in the fruit and vegetables (Patent Document 1). And 2). In the light transmission type measuring device, since the light projecting unit and the light receiving unit are provided opposite to the opposite sides centering on the fruits and vegetables, the entire device has to be fixed and does not move easily. . Therefore, the measuring apparatus has been used exclusively for fruits and vegetables that are transported on a conveyor in the fruits and vegetables market.

  On the other hand, in order to make the fruit and vegetable measuring device movable, the light projecting part and the light receiving part are arranged so as to be close to each other, and the light reflected from the surface of the fruit and vegetables is received or diffused inside the fruit and emitted. A light diffusion type measuring device for receiving diffused light that has been developed has been developed (see Patent Document 3 or 4). This type of measuring device uses an LED as a projection light source, irradiates near-infrared rays of a predetermined wavelength with this LED, and calculates characteristics (for example, sugar content and maturity) to be measured from the reflectance or transmittance of the wavelength. It was something to do. In addition, as a method for measuring the amount of transmitted light emitted from the fruits and vegetables and judging the characteristics of the fruits and vegetables, there is a correlation between measured values and measured values (absorbance measurement values) for the fruits and vegetables to be measured. A calibration curve based on this was prepared in advance, and the characteristics (evaluation amount) of fruits and vegetables were calculated by comparing the measured values of reflected light or diffused light with the calibration curve (see Patent Document 5).

  However, in the above-described light reflection type or light diffusion type fruit and vegetable measuring apparatus, the light source that irradiates the fruit and vegetable is set to a specific wavelength, so the wavelength of the light that is irradiated according to the characteristics of the fruit and vegetable to be measured is changed. It was specified. Therefore, when measuring the sugar content and the maturity at the same time, it is necessary to irradiate light of different wavelengths in several times and sequentially receive the light, which takes time. In particular, measuring a large number of reflected light or diffused light with different wavelengths significantly increases the number of light sources and the number of times of measurement, leading to an increase in the size of the apparatus and an increase in measurement time.

  In order to solve the above problems, it is possible to measure the light of a specific wavelength by spectroscopically analyzing reflected light, diffused light or transmitted light without specifying the wavelength of the irradiated light. Due to the high price, the price of the entire measuring device has increased. Therefore, the inventors of the present application enclose a plurality of optical transmission cables configured by a plurality of optical fibers and transmitting diffused light detected by the light receiving unit to the respective optical filters, and respective ends of the optical transmission cables. Meanwhile, a non-destructive measuring apparatus for fruits and vegetables was devised that can simultaneously measure light in a plurality of ranges of wavelengths of the cable support section that holds the end in the vicinity of each optical filter (Patent Document 6).

  In addition, a method and apparatus for quantitatively analyzing the concentration of biological components in human or living skin tissue has been developed (see Patent Document 7), and as biological components, glucose, blood sugar level, tissue water content, neutral fat, cholesterol, glycation Hemoglobin (HbA1c), fructosamine, albumin, globulin, uric acid and the like are exemplified. Therefore, when the subject is meat or fish, it is possible to quantitatively measure the concentrations of these biological components.

  On the other hand, as a device for measuring the characteristic distribution inside the subject, a unit different from the peripheral part in the living body is arranged in a matrix form with a pair of light emitting elements (light emitting diodes) and light receiving elements (photosensors). There has been a device for detecting (see Patent Document 8). This device examines biological material measurement from a two-dimensional distribution of frequency deviations based on the phase difference between a periodic input signal for driving a light emitting element and a periodic output signal taken from a light receiving element. there were.

  Furthermore, as a small non-destructive measuring device, a small package spectroscopic sensor unit has been developed (see Patent Document 9), which combines an optical fiber bundle, a light diffuser, a continuous variable interference filter, and a photoelectric conversion element. It was a device of the configuration.

JP-A-6-186159 JP 2002-122536 A JP-A-5-288664 JP 2000-88747 A JP 2006-226775 A Utility Model Registration No. 3162945 JP 2003-144421 A JP 2005-103054 A International Publication WO2003 / 091676

  The technique described in Patent Document 6 is an apparatus developed by the inventors of the present application, but a plurality of optical transmission cables are composed of a number of optical fibers, and it takes time and effort to branch uniformly and accurately. In addition, since the shape of each device is not stable, it becomes unsuitable for mass production, and the entire device has to be expensive. Moreover, although the said apparatus was small enough, reduction in thickness and size was desired.

  The technique described in Patent Document 7 requires a light receiving / emitting probe and a diffraction grating unit that separates light after light reception. In addition to the diffraction grating unit, a light receiving element unit and an arithmetic unit are connected to the light receiving / emitting probe. However, it is difficult to downsize the entire apparatus.

  In addition, it is difficult to measure the biological component concentration distribution of the subject with the two techniques described above. With the technique described in Patent Document 8, a periodic input signal for driving the light emitting element, Due to the phase difference with the periodic output signal extracted from the light receiving element, the change in the frequency is converted into the material property of the living tissue, so the resolution is very low and a reasonably accurate distribution is measured. It was difficult. Furthermore, the technique described in Patent Document 9 is a small package spectroscopic sensor unit, but also combines an optical fiber light diffuser continuously variable interference filter and a photoelectric conversion element to obtain an optical fiber bundle, a light diffuser, and a continuously variable interference filter. In order to make the optical paths coincide with each other, since the apparatus uses large and expensive parts, it cannot be produced at low cost, and it is difficult to adjust and specify the required wavelength.

  The present invention has been made in view of the above-mentioned various points. The object of the present invention is to provide a non-destructive measurement apparatus capable of measuring the concentration of a biological component of a subject while reducing the size or thickness of the subject. It is to provide a nondestructive measuring device capable of measuring a biological component concentration distribution.

  Therefore, the present invention specifies from a light emitting unit that irradiates light to a subject to be measured, a light receiving unit that receives reflected light, diffused light, or transmitted light emitted from the subject, and light received by the light receiving unit. A plurality of optical filters that transmit light having the optical characteristics, an integrally formed optical waveguide that guides light received by the light receiving unit to the plurality of optical filters, and light having specific optical characteristics that has passed through the optical filters. And a processing means for calculating the evaluation amount of the subject from the calibration curve using the detected reflected light, diffused light or transmitted light.

  With the above configuration, the waveguide formed integrally with the light received by the light receiving unit can be guided to the optical filter, and it is not necessary to use an expensive optical fiber. In the range up to a plurality of optical filters, light of approximately the same degree is uniformly guided, so that each optical filter can detect light of a specific optical characteristic by the light receiving element, and light of each optical characteristic can be detected. The intensity can be measured.

  According to the present invention, the range from the light receiving unit to the optical filter can be shortened by the integrally formed optical waveguide, and the biological component concentration of the subject can be measured while making the nondestructive measurement apparatus small or thin. can do. In addition, since a plurality of optical filters are provided and the light intensity distribution corresponding to the number of the optical filters can be measured, the biological component concentration distribution of the subject can be measured by measuring the light intensity. .

It is explanatory drawing which shows the outline of 1st embodiment of this invention. It is II-II sectional drawing in FIG.1 (b). It is explanatory drawing which shows the relationship between an optical waveguide, an optical filter, and a light receiving element. It is explanatory drawing which shows the modification of an optical waveguide. It is explanatory drawing which shows the optical waveguide which has a light leakage prevention layer. It is explanatory drawing which shows the modularized light receiving element and optical waveguide. It is explanatory drawing which shows the modification of the light receiving element and optical waveguide which were modularized. It is explanatory drawing which shows the modification of the light receiving element and optical waveguide which were modularized. It is explanatory drawing which shows the modification of an optical waveguide. It is explanatory drawing which shows 2nd embodiment of this invention. It is XI-XI sectional drawing in Fig.10 (a). It is explanatory drawing which shows the modularized light receiving element and optical waveguide in 2nd embodiment. It is explanatory drawing which shows the modification of a light emitting element. It is explanatory drawing which shows embodiment (3rd embodiment) of a transmission type measuring device. It is explanatory drawing which shows the modification of embodiment (3rd embodiment) of a transmissive | pervious measuring apparatus. It is explanatory drawing which shows embodiment of the apparatus which measures density distribution. It is explanatory drawing which shows the example which packaged the light emission part and the light-receiving part. It is explanatory drawing which shows the usage example of a Peltier element. It is explanatory drawing which shows the example of the combination of the packaged light emitting element and the light receiving element, and a Peltier element. It is explanatory drawing which shows the modification of embodiment at the time of using a non-contact thermometer. It is explanatory drawing which shows the modification of an optical waveguide.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an outline of the first embodiment of the present invention. As shown in FIGS. 1A and 1B, the present embodiment is generally composed of a subject measurement unit 1 and a power supply unit unit 2. The power supply unit 2 has a built-in alarm device for notifying the power supply and the measurement state (not shown). The power switch 21 and the measurement switch 22 provided on the side of the power supply unit 2 are turned on / off. It is possible to turn OFF and start / stop measurement. As a power source, a dry battery may be accommodated, but a battery-type power source may be incorporated. The notification device is an electronic sound generation device for notifying the start of measurement and the completion of measurement, and is composed of an oscillation circuit and a speaker. This notification device may be optically displayed on a display unit described later, or may be configured not to be provided.

  The subject measurement unit 1 is provided with a display unit 3 for displaying a measurement state and measurement results on one surface 11 (see FIG. 1A), and the type of the subject to be measured is displayed. While displaying, the result processed by the processing apparatus mentioned later is displayed. The other surface 12 is provided with a measurement window 4 (see FIG. 1B), which irradiates the subject with light emitted from a light emitting unit described later, and also reflects or diffuses light emitted from the subject. Can be received. The measurement window is provided with an annular contact portion 41 for contacting the surface of the luminescent subject, and the reflected light or diffused light passing through the inside of the contact portion 41 is acquired and measured. It is configured. In addition, this contact part 41 is comprised with the flexible raw material which can be deform | transformed easily so that a subject can be contacted flexibly. The measurement window 4 is made of a transparent material so as to transmit light from a built-in light emitting unit and receive light reflected or diffused by a subject. The light emitting unit 7 and the optical waveguide 8 are built in close proximity via the measurement window 4 (see FIG. 1C).

  The inside of the subject measurement unit 1 is shown in FIG. This figure is a diagram schematically showing a cross section taken along line II-II in FIG. As shown in this figure, the display unit 3 of the subject measuring unit 1 is composed of a thin plate-like member 31 and a display device 32, and a processing device 5 functioning as processing means is disposed in the vicinity thereof. Yes. The processing device 5 includes a storage unit and a calculation unit. The storage unit stores a plurality of pieces of calibration curve information to be referred to according to the type of the subject to be measured and the component to be measured. The calculation unit receives an input of a signal from the substrate 6 disposed in the vicinity of the processing device 5 and compares / calculates the calibration curve information for each subject stored in the storage unit and the input value. The biological component of the subject is analyzed. The calculation result is converted into an appropriate signal and output to the display device 32. A photo sensor 61 that functions as a light receiving element is mounted on the substrate 6 or formed on the surface of the substrate 6 so that the intensity of the received light can be measured.

  A light-emitting element 7 that functions as a light-emitting unit is built in the subject measurement unit 1, and light from the light-emitting element 7 is emitted outward through the measurement window 4. Here, although the illustrated light emitting element 7 shows a tungsten halogen lamp having a wide light emission wavelength characteristic, other light emitting elements such as LEDs can be used as will be described later. Further, the measurement window 4 is provided by a resin such as transparent glass or acrylic.

  An optical waveguide 8 is installed in the vicinity of the light emitting element 7. The optical waveguide 8 is for guiding light received from a part of the measurement window 4 to the photosensor 61, and is disposed between the two. A part of the measurement window 4 is distinguished from other parts of the measurement window 4 by the contact part 41 and functions as a light receiving part 42. The light receiving unit 42 internally includes reflected light or diffused light emitted from the subject F (hereinafter sometimes referred to as “input light”, and “input light” may include transmitted light). In order to make it enter, it is provided with resin such as transparent glass or acrylic. Further, the periphery of the optical waveguide 8 is surrounded by a partition wall 9 so that the light emitted from the light emitting element 7 does not directly enter the optical waveguide 8. In addition, in order to allow the incident to the optical waveguide 8 only for the input light emitted from the subject F, one end surface 81 of the optical waveguide 8 is disposed so as to face the light receiving portion 42, and the end surface 81 The gap between the light receiving part 42 and the light receiving part 42 is also shielded by the partition wall 9. The other end surface of the optical waveguide 8 is opposed to the photosensor 61, but an optical filter 62 is interposed in order to detect light exhibiting specific optical characteristics. The photosensor 61 and the optical filter 61 are surrounded by a light shielding wall 63 so that the photosensor 61 can detect only the light guided by the optical waveguide 8. Since the contact portion 41 is a member that directly contacts the surface of the subject F, the contact portion 41 is configured by a flexible buffer member and can be deformed when strongly pressed against the subject F. Moreover, it is provided in the shape of a ring (parabolic) so that external light does not enter from the contact end.

  Here, as the component measurement scheduled in the present embodiment, the subject F, the fruits, vegetables, etc. include apples, strawberries, strawberries, mango, tomatoes, Chinese cabbage, cabbage, spinach, etc. The purpose is to measure the value of degree (or hardness), lycopene, and other characteristics. For pork, beef and fish, the purpose is to measure fat, amino acids, other proteins, starch content, acidity, glucose content, etc. It is said. Furthermore, it is possible to measure the amount of glucose, blood sugar level, etc. in a living body (human body, etc.), and the distribution state of each of the above characteristics can also be measured.

  The light emitting element is typically a tungsten halogen lamp or a light emitting diode (LED). The halogen lamp can be used stably from light having a wavelength of about 400 nm to light having a wavelength of about 3500 nm. In addition, when a light emitting diode is used as a light emitting element, a plurality of light emitting diodes having a light emission wavelength specific to each light emitting diode are selected and used in combination. Prepare as many light-emitting diodes as the number of wavelengths required for measurement. When the sugar content of melon is measured, a detection wavelength can be appropriately selected and combined from center wavelengths of about 590 nm, 720 nm, 734 nm, 742 nm, 750 nm, 766 nm, 810 nm, 830 nm, 838 nm, 958 nm, 910 nm, 926 nm, and 1030 nm. In addition, when the subject is a living body such as meat, fish, or human, the detection wavelength is appropriately selected from the center wavelengths of about 800 nm, 830 nm, 930 nm, 970 nm, 1020 nm, 1188 nm, 1215 nm, 1628 nm, 1670 nm, 1722 nm, and 1728 nm. Can be used.

  A photosensor is used as the light receiving element. As the photosensor, a transistor, a photodiode, a photo IC, or the like is used, and can be appropriately selected from these. In addition, when using a photodiode, different types of photodiodes can be selected depending on the wavelength to be measured. For example, Si (silicon) photodiodes are selected when the detection wavelength is 400 nm to 1100 nm, and Ge (germanium) or InGaAs (indium-gallium-arsenide) photodiodes are selected and used in combination when the detection wavelength is 1000 nm to 1600 nm. it can.

  Further, in a portion where the light receiving element 61 is provided, a Peltier element or the like is disposed on the bottom side or the peripheral part of the light receiving element 61 and is kept at a predetermined temperature, so that the accuracy can be further improved. Further, when a light emitting diode or the like is used as the light emitting element, the detection accuracy can be further improved by stabilizing the light emission intensity and the light emission wavelength by arranging the light emitting element at the bottom and periphery of the light emitting element and maintaining them at a predetermined temperature.

  Next, the optical waveguide 8 will be described in detail. As shown in FIG. 3, the optical waveguide 8 of the present embodiment includes an introduction part 80a and a branch part 80b. The introduction part 80a is formed in a substantially cylindrical shape, and the branch part 80b is branched into a plurality of parts from the introduction part 80a, and is formed in a substantially rectangular column shape. The introduction part 80a and the branch part 80b are formed integrally, and for example, plastic materials such as acrylic resin, polycarbonate, polyethylene, polyethylene terephthalate, polypropylene, polystyrene, and polyvinyl chloride can be used. . These materials can be appropriately set according to the light emitting element 7 or the light wavelength of the input light. The forming method can be formed by using mold forming, injection molding, cutting tool, cutting with a laser beam, adhesion of a branch portion, or the like.

  One end surface (light-receiving-unit-side end surface) 81 of the optical waveguide 8 is bulged into a convex lens shape so that input light can be condensed. This end face shape may be a flat end face shape when it is not necessary to collect light as in the case where the input light is strong. The other end (end face on the optical filter side) 82 is a flat end face so that input light can be emitted in a state of being close to (or in contact with) the surface of the optical filter 62. A substrate 6 is disposed on the back side of the optical filter 62, and the light receiving element (photodiode or the like) 61 is provided. Therefore, light corresponding to the wavelength detected by the optical filter 62 can be detected by the light receiving element (photodiode or the like) 61. In this figure, the light receiving elements having the optical filters 62 corresponding to nine different wavelengths are arranged in 3 × 3 in the vertical and horizontal directions, but the number of the optical filters 62 and the light receiving elements 61 needs to be nine. Not, it depends on the measurement target.

  As described above, the branch part 80b of the optical waveguide 8 is for guiding the input light incident from the introduction part 80a to each of the plurality of optical filters 62. In order to induce a certain amount of light, the size (cross-sectional area) of each branch (branch waveguide) branched by the branching portion 80b can be appropriately adjusted. The adjustment of the size (cross-sectional area) means that when the amount of light near the center (axial center) of the introduction part 80a is strong and the peripheral part becomes weak, the light quantity near the center is limited in accordance with the peripheral part. . For example, as shown in the drawing, 3 × 3 nine optical filters 62 arranged in a square matrix form are located farthest from the center (axial center) of the introduction portion 80a at the four corners, What is located in the center of the square is on the center (axial center) line of the introduction part 80a and is closest. Therefore, each end face 82 of the branching portion 80b for guiding the input light to these is branched and arranged at the position of each optical filter 62, so that the amount of the input light that can be guided to the optical sensor located at the center is larger. In some cases, the amount of input light that can be guided to an optical sensor located in the periphery is weakened. Therefore, the amount of light is suppressed by reducing the cross-sectional area of the branching waveguide in the portion that leads to the optical sensor located at the center. However, such adjustment of the amount of light is not indispensable. By grasping the amount of light obtained in advance and appropriately processing input light data obtained from a photosensor or the like according to the amount of light, the light amount can be adjusted at different positions. It is possible to correct the change in the amount of light.

  Here, the number of optical filters 62 required for the measurement of the subject (for example, nine in the figure) is arranged, and those that can transmit light of different wavelengths are used. Therefore, for example, when nine optical fifilters 62 are used as described above, light of nine types of wavelengths can be obtained, and it is assumed that light near a wavelength of 1000 nm is measured from light near a wavelength of 700 nm. In the above-mentioned range, nine types of light having a desired wavelength can be obtained. Thereby, it is possible to obtain the same effect as in the case of performing spectroscopy using a spectroscope.

  Note that the nine types described above are examples, and this number can be increased or decreased. Further, even when detecting light of nine different wavelengths, when calculating the characteristics of the subject, it is possible to select and use only several types of measured light values that should be necessary. Further, the light that can be transmitted by the optical filter 62 may have a predetermined wavelength width from the center wavelength, but the light having the desired wavelength means the center wavelength. The optical filter of this embodiment transmits light having a wavelength in the range of about 5 nm before and after the center wavelength, but the wavelength width before and after the center wavelength is not limited to this.

  Moreover, the optical waveguide 8 is not limited to the case where light is guided to the nine optical filters 62 arranged in the 3 × 3 length and width as described above. The modification is shown in FIG. As shown in this figure, the basic configuration of the optical waveguide 8 is the same as that described above, but the branching portion 80b is branched in a line. Although this number is exemplified by three, naturally, the number can be increased or decreased. Such an arrangement can be appropriately changed so as to correspond to the arrangement of the photosensor 61 having the optical filter 62.

  Furthermore, as shown in FIG. 5, a light leakage prevention layer 83 can be provided except for the light receiving portion of the optical waveguide 8 and the end face facing the filter. In this case, the light leakage prevention layer 83 can be a metal thin film, a plastic resin having a low refractive index, a coating film, or a coating film containing fine metal particles. The metal thin film functions as a reflective layer and utilizes Al (aluminum), Ni (nickel), Ag (silver), Au (gold), Ti (titanium), Cu (copper), etc., and laminated films and alloy films thereof. be able to. For example, the Al thin film can be formed by vapor deposition or sputtering, the Ni thin film can be formed by electroless Ni plating, and the Ag thin film can be formed by silver mirror reaction. It is sufficient that the thickness of the metal thin film layer is 10 nm to 2 μm. In the present embodiment, the thickness is 0.1 μm. Also, in order not to form a metal thin film on the light receiving part of the optical waveguide and the end face part facing the optical filter, a member such as a masking tape is attached to the part before vapor deposition or the like, and other methods are screen printing. A masking material may be formed using a printing method such as the above, and the masking tape, the masking material, and the like may be removed after vapor deposition. In addition, a metal layer is formed on the entire surface, and the metal thin film in a predetermined region can be removed by a photolithography / etching technique using a resist used in a so-called semiconductor process. As the other light leakage prevention layer 83, a layer using a plastic resin layer having a low refractive index formed around the optical waveguide can be assumed as a configuration using so-called total reflection. The surroundings can be handled easily by coating a resin film with higher strength.

  Since the present embodiment is configured as described above, the light irradiated to the subject F by the light emitting element 7 is incident on the inside of the subject measuring unit 1 from the light receiving unit 42 as reflected light or diffused light, and is received. Input light incident through the section 42 passes through the inside of the optical waveguide 8 and is guided to the optical filter 62. After passing light of a specific wavelength by the optical filter 62, the light is detected by the light receiving element (photo sensor) 61, and the state of the light is processed. As described above, since the optical waveguide 8 is integrally formed, the input light can be guided between the light receiving unit 42 and the optical filter 62 by the small optical waveguide 8, thereby reducing the size of the entire apparatus. It becomes possible. Further, since the input light is branched in the middle of passing through the optical waveguide 8, the light can be guided while being appropriately branched with respect to the required number of optical filters 62.

  Next, modified examples of the optical waveguide 8 and modified examples of the light receiving element 61 and the optical filter 62 will be described. In the above-described embodiment, the optical waveguide 8 is divided into the introduction portion 80a and the branch portion 80b. However, the branch portion 80a may not be formed. This form is shown in FIG. As shown in FIG. 6A, in the case where the optical waveguide 8 is not branched, the light receiving element 61 and the optical filter 62 can be arranged close to each other (adjacent). Therefore, in this embodiment, for example, nine light receiving filters and nine light receiving elements are integrally formed to form a light receiving element module. Also in the above embodiment, as shown in FIG. 6B, the light leakage prevention layer 83 can be provided except for the light receiving portion of the optical waveguide 8 and the end face facing the filter. The formation of the light leakage prevention layer 83 is the same as described above.

  The light receiving element module as described above is formed by integrating a plurality of light receiving elements 61 and an optical filter 62 without being separated, as shown in FIG. Here, since the light before passing through each optical filter 62 is the same input light, it is only necessary to clearly block the boundary of each optical filter 62. Further, by modularizing in this way, further miniaturization and simplification of assembly can be achieved. Further, by adopting this configuration, it is possible to easily and surely position the optical waveguide, the modularized light receiving filter, and the light receiving element, and it is possible to improve accuracy and integrate without variation. The modularization of the light receiving element 61 and the optical filter 62 can be manufactured by forming a photosensor on a semiconductor substrate and further attaching or printing a filter material on the surface thereof.

  The photosensor on the substrate can be easily formed in an appropriate size and position by a so-called semiconductor process. After the photosensor is formed, only a desired photosensor can be formed by photoresist or masking. A filter capable of transmitting a wavelength can be formed. The filter can be formed by vapor deposition or sputtering. In addition, in order to form the light shielding wall 63 at the boundary portion between the adjacent photosensors 61 and the optical filter 62, when silicon is used for the substrate, a silicon oxide film that can be formed as an insulating layer is laminated. Is also possible. Furthermore, a plurality of light receiving elements may be individually manufactured and appropriately arranged two-dimensionally, and a light receiving element module in which these adjacent light receiving elements are bonded and integrated may be formed. In this case, each of the light receiving elements can form a photosensor by the semiconductor process described above, and an antireflection film is provided on the edge of each light receiving element to prevent light from entering between the light receiving elements. can do. The antireflection film can be easily formed by, for example, immersing the edge in a liquid (antireflection liquid or the like) having a property of preventing light reflection. As described above, the same method as that of the light receiving element module shown in FIG.

  The configuration of the module in the above is not limited to nine light receiving filters and light receiving elements, and a plurality of modules can be manufactured in any arrangement shape. A plurality can be arranged in one row, and if necessary, only the peripheral portion can be arranged and the middle can be opened. FIG. 7A shows a state where the middle of the module is opened, and FIG. 7B shows the shape of the optical waveguide 8 that can be mounted on the module. As shown in this figure, in such a configuration, nine light receiving elements 61 are not disposed, but a central section is penetrated and eight light receiving elements 61 are disposed in the periphery thereof. There is a protrusion at the center of the optical waveguide 8 to correspond to this. Thus, the optical waveguide 8 and the module can be easily positioned by fitting the through portion and the protrusion. Further, according to the above configuration, the light detection at the position where the light amount of the input light is the strongest (the portion matching the center (axial center) of the optical waveguide 8) is eliminated as described above. There is also an effect of preventing the difference from being greatly different.

  In addition to the above, the configuration for facilitating the positioning of the optical waveguide 8 may include the configurations shown in FIGS. 8 (a) and 8 (b). This is because a bottomed cylindrical positioning box is provided, an optical filter and a light receiving element are arranged on the bottom thereof (FIG. 8A), and the optical waveguide 8 is accommodated by the same positioning box. In order to store the optical waveguide 8 in the same box, the optical waveguide 8 is provided in a shape that can be stored (FIG. 8B). A state in which the optical waveguide 8 is accommodated is shown in FIG.

  As a further modification, there is a configuration in which the introduction portion 80a is extremely short. The form is shown in FIG. As shown in FIG. 9A, when the branching portion 80b is not formed, light can be guided to the optical filter and the light receiving element while being condensed by the dome-shaped introduction portion 80a. Further, as shown in FIG. 9B, the introduction part 80a may be configured to have the same size as the branch part 80b. In this case, since the branch portion 80b is formed, an optical filter and a light receiving element that are not modularized can be used.

  Next, a second embodiment of the present invention will be described. FIG. 10 shows the outline. As shown in this figure, the present embodiment is configured to be thin overall. As shown in FIG. 10A, also in the case of the present embodiment, the subject measurement unit 101 and the power supply unit unit 102 are roughly divided, and a display unit 103 is provided on one side thereof. A light receiving unit 142 is provided at the tip of the subject measuring unit 101, and can receive input light and guide it to the inside. The switch group is arranged on the side surface of the main body. Further, in the present embodiment, a light receiving unit 142 is provided on the end surface side of the subject measuring unit 101, and a light emitting unit (light emitting element) 107 is provided on the end surface as shown in FIG. In the present embodiment, the flat optical waveguide 108 and the line array light receiving element or the array light receiving element module 160 are combined in order to reduce the thickness of the entire apparatus.

  An outline of the inside is shown in FIG. As shown in this figure, the main part array in the subject measurement unit 101 includes a light emitting unit 107 and a light receiving unit 142 arranged at the end of the subject measurement unit 101 (see FIG. 10B), The flat optical waveguide 108 arranged continuously to the light receiving unit 142, the line array light receiving element or the line array light receiving element module 160 provided at the end of the optical waveguide and having the optical filter formed on the upper surface, and the light receiving A processing device 105 that processes information of the element or module 160 and a display unit (for example, a liquid crystal display) 103 that displays the processed information, and a thin battery (for example, a lithium battery) 102 is disposed in the power supply unit 102. Has been. In this figure, wiring indicating signal transmission / reception is not shown, but measurement value data is transmitted / received to the light receiving element or module 160 and the processing device 105, and the processing device 105 and the display unit 103 are displayed. Necessary data is sent and received. The power supply in the power supply unit 102 is also wired between each part.

  By the way, the optical waveguide 108 in the present embodiment uses the optical waveguide 8 having a configuration in which the branch portions 80b illustrated in FIG. 4 are arranged in a line. That is, as shown in FIG. 4, by using the optical waveguide 8 in which the branch portions 80b are arranged in a line, the optical filter 62 and the light receiving element 61 can be arranged in a line. Such a thin subject measurement unit 101 can be configured. Also in this embodiment, as shown in FIG. 12, by using a configuration in which the optical filter 162 and the light receiving element 161 are modularized, the arrayed light receiving element module 160 is used by making the optical waveguide 108 not branch. Is possible. Furthermore, the first embodiment can also be configured to efficiently guide the input light by forming the light leakage prevention layer 183 on a part of the surface of the optical waveguide 108 regardless of the presence or absence of these branches. It is the same.

  Note that a plurality of light receiving elements 161 and optical filters 162 are arranged in a row, but the number of these can be changed as appropriate according to the measurement target. In addition, the array light receiving element module of FIG. 12 can be modularized by a configuration in which a plurality of photosensors are formed on the same substrate, and input light is mixed into the boundary portion between each photosensor and optical filter. A light shielding wall 163 for preventing this may be formed.

  Further, other forms can be adopted. Another embodiment is shown in FIG. FIG. 13A shows a configuration in which three light emitting elements (tungsten halogen lamps) 7 a, 7 b, 7 c are arranged around the optical waveguide 8. When strong light irradiation is required depending on the type of subject, reflected light or diffused light required for measurement can be obtained by using a plurality of light emitting elements 7a, 7b, 7c. FIG. 13B shows a form in which an LED is used as the light emitting element 7 instead of a tungsten halogen lamp. As described above, the light-emitting element 7 is not limited to the tungsten halogen lamp, and other light-emitting elements may be used, and a solid-state light-emitting element can be used. Therefore, as a solid-state light-emitting element, an LED is illustrated as a typical example. Thus, when using a solid light emitting diode, size reduction, thickness reduction, power consumption reduction, and the thermal influence from a tungsten halogen lamp can be reduced. In addition, as a solid light emitting element, there exist LED (light emitting diode), a laser diode, an electroluminescent element (EL element), etc.

  FIG. 13C shows a state in which three light emitting elements 7a, 7b, and 7c constituted by the LEDs are arranged. As described above (as shown in FIG. 13A), as in the case where three tungsten halogen lamps are used, a configuration in which the number of the solid-state light emitting elements is increased when a strong light amount is to be irradiated. Is possible. Note that each of the light emitting elements 7a, 7b, and 7c has a plurality of elements (LEDs) gathered to form a group of light emitting elements 7a, 7b, and 7c. FIG. An example in which a plurality of aggregates are provided is shown. In this way, by using an aggregate of a plurality of elements, the wavelength of light emitted by each element can be varied, and by irradiating the wavelength of light necessary for component measurement of the subject, The state of reflection / diffusion of light of a specific wavelength can be detected. The wavelength may be changed in units of the light emitting elements 7a, 7b, and 7c each having a plurality of aggregates. Furthermore, when using an LED or EL element, the light emitting element may be arranged in a circle centered on the light receiving portion. When using an LED, the plurality of LEDs are arranged at appropriate intervals around the entire circumference of the circle, and when an EL element is used, the EL element can be arranged in a circular shape.

  Next, as a third embodiment of the present invention, a description will be given of a form of a measuring device (transmissive measuring device) that receives transmitted light. FIG. 14 shows this embodiment. This embodiment is also a modified example of the thinned form (see FIGS. 10 and 11). In the thinned embodiment, the subject measurement 101 is separated into the light emitting side 101a and the light receiving side 101b. The light emitting side 101a incorporates a light emitting element, and can emit light toward the light receiving side 101b (from the surface facing the light receiving side 101b), and a display portion 103 is provided on the outer surface. . On the other hand, a light receiving unit 142 is provided on the light receiving side 101b so that light emitted from the light emitting side 101a can be received. The light receiving side 101b contains a thin optical waveguide and light receiving element modules arranged in a line as in the above-described thin device (see FIG. 11), and each light receiving element ( The received light can be guided to the optical filter). The power supply is built in the light receiving side 101b, and a switch group for various operations is provided on the side of the light receiving side 101b. The processing device that processes the data of the received light is built in the light emitting side 101 a, and the data detected by the light receiving element on the light receiving side 101 b is processed on the light emitting side 101 a and displayed on the display unit 103. It has become. The light emitting side 101a and the light receiving side 10b are provided so as to be rotatable by a pivot 120, and are configured integrally with the pivot 120. Further, a power cable and a data line are connected to the light emitting side 101a via the pivot 120 (passing through the pivot).

  With the configuration described above, the angle between the light receiving side 101b and the light receiving side 101b can be changed by rotating the light emitting side 101a around the pivot 120, thereby adjusting the gap between the light emitting side 101b and the light receiving side 101b. It becomes possible to do. Therefore, in use, the angle of the light emitting side 101a is increased (see FIG. 14A), the gap between both is widened, and then the subject is placed on the light receiving unit 142 of the light receiving side 101b, and the angle of the light emitting side 101a is set. By reducing the distance, the subject can be sandwiched between the light emitting side 101a and the light receiving side 101b (see FIG. 14B). In this state, light is emitted from the light emitting element, and the light receiving element receives the transmitted light on the opposite side, whereby the biological component concentration of the subject by the transmitted light can be measured. With such a configuration, it is possible to measure the biological component concentration by transmitted light for a relatively thin subject such as a leaf of a plant or a sliced meat piece. When the thickness of the subject affects the measured value, the thickness can be measured simultaneously. As a measuring method, in addition to a method (mechanical measuring method) for calculating the thickness from the angle between the light-emitting side 101a and the light-receiving side 101b in a state where the object is sandwiched, it is measured by an optical path difference (optical measurement). Method) or a method of measuring by ultrasonic waves (ultrasonic measurement method).

  A modification of the embodiment according to the transmission type measuring apparatus is shown in FIG. The modification shown in this figure is a transmitted light type measuring apparatus for a thick subject or the like. Also in this modified example, the subject measuring unit 101 is separated into a light emitting side 101a and a light receiving side 101b, and the subject is irradiated with light emitted from the light emitting unit on the light emitting side 101a, and the transmitted light is received on the light receiving side. The light is received at 101b and the biological component concentration of the subject is measured. The light emitting element, the processing apparatus, and the display unit 103 provided on the light emitting side 101a are the same as those in the above embodiment, and the light receiving element module and the like provided on the light receiving side 101b are the same as those in the above embodiment.

  In this modification, a support portion 101c is interposed between the light emitting side 101a and the light receiving side 101b, so that the height of the light emitting side 101a can be freely changed. The light emitting side 101a and the support portion 101c are continuously pivotable by a pivot 120a, and the light receiving side 101b and the support portion 101c are also continuously pivotable by another pivot 120b. Therefore, the light emitting side 101a can freely adjust the distance from the light receiving side 101b and the angle of the light emitting side 101a, and the light emitting surface 111 of the light emitting side 101a and the light receiving surface 112 of the light receiving side 101b are arranged in parallel. It becomes possible to do. Further, the light receiving side 101b is provided with a light receiving part 142 so that the light receiving part 142 can be expanded and contracted, and the light receiving part 142 can be arranged at a position opposite to the position of the light emitting side 101a. Therefore, the light irradiated by the light emitting element incorporated in the light emitting side 101a goes to the light receiving unit 142 on the light receiving side 101b, and the biological component concentration by the transmitted light is measured by arranging the subject between them. It is something that can be done. With such a configuration, it is possible to measure a relatively thick subject such as fruit, vegetable, or block meat. When the thickness of the subject affects the measured value, the thickness is measured simultaneously by a mechanical measurement method, an optical measurement method, an ultrasonic measurement method, etc., as in the above embodiment. It is also possible to do.

  In the third embodiment (see FIG. 14) and its modified example (see FIG. 15), the form using the thin light emitting element and the thin light receiving element module is exemplified. However, the present invention is not limited to these. In the case where the light emitting element portion and the light receiving element portion are allowed to be somewhat thicker, for example, the configuration in the first embodiment (see FIG. 2) as the light emitting element, that is, a configuration using a tungsten halogen lamp, Similarly, as the light receiving element, the optical waveguide 8, the optical filter 62, the photo sensor 61, and the like as in the first embodiment (see FIG. 3) may be installed.

  Next, an example in which a plurality of filters are formed on the image sensor will be described. This measures the distribution information of the internal state of components (for example, sugar content) of the subject (for example, melon) at a time. As shown in FIG. 16A, a module 260 is formed by periodically arranging a plurality of types of wavelength filters on the surface of the image sensor. That is, by forming a group of collective filters with filters that transmit several types of wavelengths and regularly arranging them on the image sensor, it is possible to grasp the component concentration for each collective filter as a unit. The distribution information can be displayed by acquiring a plurality of image data corresponding to each wavelength for each of the plurality of collective filters. For example, if filters corresponding to five types of wavelengths are formed, five types of wavelength distribution data can be obtained, and fine data on sugar content can be obtained by analyzing the data. The image sensor module 260 is packaged by the sensor package 200.

  The input light in this embodiment is acquired by the optical waveguide 8 as described above. However, as shown in FIG. 16B or FIG. 16C, the input light in a wide range is formed by the light receiving unit 208 that does not form a branching portion. Is induced. The packaged image sensor module 260 is formed on a substrate 206 disposed inside the sensor package 200, and the surface thereof is protected by a transparent light transmission window 285 that is packaged at the same time. Accordingly, the input light incident from the light receiving unit is guided to the light transmission window 285 of the sensor package 200 by the optical waveguide 208, passes through the light transmission window 285, and reaches the image sensor module 260.

  The image sensor includes a photoelectric conversion element integrated by a semiconductor process, and a CCD sensor, a CMOS sensor, and the like can be given as representative examples. In this manner, by using an image sensor integrated by a semiconductor process, an image sensor and an optical filter can be appropriately formed on the same substrate 2206. Also, as shown in FIGS. 16B and 16C, since the image sensor of this embodiment is packaged, a plurality of terminals are formed on the bottom of the sensor package 200. Used for transfer of photoelectrically converted charges by an image sensor. That is, it is a terminal for outputting an image signal.

  In addition, the kind of optical filter arrange | positioned on the said image sensor can form a required kind suitably. The number and type necessary for measuring the biological component concentration of the subject are selected and used according to the desired wavelength. In addition, the image sensor can be packaged, for example, by being housed in a ceramic package, a plastic mold package, or the like, so that the image sensor can be easily reduced in size and handled.

  The embodiment of the present invention is as described above, but the present invention is not limited to the above-described range, and various forms can be made within the scope of the invention. For example, in the embodiment described above, the light receiving element is mainly modularized, but a configuration in which a plurality of light emitting elements are modularized may be employed. In this case, the wavelength of light emitted by each light-emitting element that is modularized is made different so that the light wavelength necessary for measuring the component of the subject is irradiated, thereby reflecting or diffusing light of a specific wavelength. Can be detected. Further, by simultaneously emitting light from modularized LEDs (light emitting diodes), it is possible to simultaneously measure with a light receiving element having a corresponding filter wavelength, so that the measurement time can be shortened. Depending on the application, it is possible to emit light individually instead of simultaneously. In addition, group emission and group detection may be performed by dividing into some groups.

  In addition, a light-emitting element part, optical waveguide, light-receiving element, integrated circuit as a circuit part if necessary, and other components are mounted on a wiring board such as a printed circuit board or ceramic substrate on which a wiring layer is formed, and the whole is resin-molded. May be. This state is shown in FIG. As shown in this figure, in the above structure, the main components of the nondestructive measuring apparatus are concentrated in the mold package 309, so that the size, thickness, and mounting position of each part are determined at the manufacturing stage, and there is no variation. The complete set can be provided as a module. Since the mold package 309 basically has a light shielding property, it can be used as a partition wall. A substrate 306 is disposed in the package, and a light emitting element 307, a light receiving element 361, and an optical filter 362 for measuring biological components are formed on the surface of the substrate 306. An optical waveguide 308 is mounted on the optical filter 362. A light leakage prevention layer 383 may be formed around the optical waveguide 308. In addition, mounting holes 391 and 392 can be formed in the resin mold package 309 in order to mount the entire module on a housing or the like. In the above case, the resin components are packaged after mounting the components on the wiring board. However, it is possible to use a wiring board such as a printed board or a ceramic board on which a wiring layer is formed without using resin molding as a holding board. .

  Further, these light receiving elements can be further improved in accuracy by disposing temperature adjusting elements such as Peltier elements on the bottom and periphery of the light receiving elements and maintaining them at a predetermined temperature. FIG. 18A shows a configuration in which the Peltier element 400 is arranged on the bottom surface (lower part) of the light receiving element 61. With such a configuration, the detection accuracy can be improved by stabilizing the temperature of the light receiving element 61. Furthermore, when using LED (light emitting diode) etc. as the light emitting element 61, you may arrange | position the Peltier element 400 to the bottom face part of a light emitting element and a light receiving element, respectively. Further, as shown in FIG. 18B, a single Peltier element 400 may be arranged in the light emitting element portion (light emitting module) 407 and the light receiving element (light receiving module) 460. In this case, a single module including both elements for receiving and emitting light can be realized, and the light emitting side 407 and the light receiving side 460 can be maintained at predetermined temperatures, which can contribute to downsizing and cost reduction. By maintaining the temperature at a predetermined temperature as described above, the detection accuracy can be further improved by stabilizing the luminous intensity and the emission wavelength.

  Furthermore, it may be modularized including the Peltier element. This case is shown in FIG. In this structure, since the Peltier element 500 is disposed inside the mold package 509, the substrate 506 can be disposed on the upper surface of the Peltier element 500, and the light emitting element 507 and the like can be formed on the substrate 506. A module packaged by the package 500 can be configured. With such a configuration, the main components of the nondestructive measuring apparatus are integrated in the mold package, so that the size and thickness of the non-destructive measuring device are determined at the manufacturing stage, and the temperature is maintained at a predetermined temperature. Therefore, it is possible to provide modules with uniform characteristics as a module. Even in such a configuration, due to the light shielding property of the mold package 509, the package 509 can function as a light shielding wall, and attachment holes 591 and 592 for attachment to a housing or the like can be formed. is there. Similarly, in addition to mounting the components on the wiring board, the wiring board such as a printed board or a ceramic board on which a wiring layer is formed and the Peltier element portion can be used as a holding board without resin molding. .

  Moreover, as shown in FIG. 20, it is good also as a structure which has the non-contact thermometer 600. FIG. As shown in FIG. 20A, the non-contact thermometer 600 is installed in the vicinity of the light receiving unit, together with the light emitting unit 607 and the light receiving unit (optical waveguide 608), inside the subject measuring unit 601. As a result, when the light receiving unit receives input light from the subject, the temperature of the subject can be measured in the vicinity of the subject. In addition to the power switch 621 and the measurement switch 622, the power supply unit 602 of the non-contact measurement apparatus is provided with a temperature measurement mode changeover switch 623 to switch the mode for determining whether or not to measure the temperature of the subject. It is possible. As shown in FIG. 20B, a measurement completion lamp 613, a measurement execution display lamp 614, a temperature measurement lamp 615, and a temperature measurement mode switching lamp 616 are arranged in the vicinity of the display unit 604, and measurement is in progress (614). ) Or measurement completion (613), and in addition to displaying the temperature measurement mode switching state (616), the state of temperature measurement (615) is displayed. These displays may be displayed by a display device inside the display unit 604. Each measurement result is displayed on the display device via the processing device. Note that the non-contact thermometer 600 may be configured such that a thermopile thermometer is installed or formed on the substrate 606 as shown in FIG. In the case of such a structure, the whole can be modularized and the whole can be reduced in size.

  As described above, when the non-contact thermometer 600 is provided, since the temperature of the subject can be referred to, the correction is calculated particularly when the detected value of the component to be measured differs depending on the temperature of the subject. It becomes possible. That is, the subject is not the same as the ambient temperature, and differs depending on the stored situation. For example, assuming that the ambient temperature is 20 ° C. and the subject (fruits, etc.) is stored in a refrigerator and the subject is cooled to 5 ° C. to 10 ° C., The temperature is very different from the ambient temperature. Therefore, in such a case, conventionally, since the measured value such as sugar content differs depending on the temperature, the operator must perform an operation such as temperature correction so as to refer to a calibration curve corresponding to the temperature of the subject. However, the temperature correction can be automated by referring to the temperature of the subject measured by the non-contact thermometer. Accordingly, manual temperature correction by the operator (measurer) is not required. As the non-contact thermometer, a thermopile type radiation thermometer can be used, but a thermometer of another system may be used.

  In each of the above embodiments, the optical waveguide is formed using a plastic material (acrylic resin, polycarbonate, polyethylene, polyethylene terephthalate, polypropylene, polystyrene, polyvinyl chloride, etc.). The material also has a large light absorption peak near the wavelength of 1700 nm. Therefore, in the case of measuring this vicinity, for example, if an optical waveguide formed by molding borosilicate glass (for example, Pyrex (registered trademark) glass: trade name) is used, it can be applied with almost no light absorption up to a wavelength of about 320 nm to 2600 nm. . Further, as a material having good light absorption, there is synthetic quartz glass, which can be applied to about 200 nm to 3500 nm, and further, synthetic sapphire glass can be applied to about 200 nm to 4500 nm.

  When the light guiding direction by the optical waveguide is bent or curved (for example, in the case of the form shown in FIGS. 14 and 15), the light guiding direction is changed by the light reflecting layer as shown in FIG. You may comprise so that it may change. The configuration of this type of optical waveguide 8 is not limited to the case where the light guiding direction is restricted to the bending direction or the like, and can be adopted as appropriate. This is because if sufficient input light cannot be obtained even when the input light is guided in the linear direction, the input light may be easily guided by intentionally changing the light guiding direction. Further, the light receiving unit side end surface of the optical waveguide 8 has been described as having a smooth or single convex lens shape. However, in order to enhance the light collecting function, a plurality of fine convex lenses can be aligned on the end surface. It may be a lens. Moreover, it is good also as a structure which enlarges a surface area and increases the light quantity which can be received by forming an edge part in several mountain shape (pyramid type | mold).

DESCRIPTION OF SYMBOLS 1,101 Subject measurement part 2,102 Power supply unit 3,103 Display part 4,104 Measurement window 5,105 Processing apparatus (processing means)
6, 206 Substrate 7, 7a, 7b, 7c Light-emitting element 8, 108, 208 Optical waveguide 9 Bulkhead 11 One surface 12 of subject measurement unit 21 Other surface 21 of subject measurement unit Power switch 22 Measurement switch 31 Plate-like member 32 Display Apparatus 41, 141 Contact part 42, 142 Light receiving part 61, 161 Light receiving element (photo sensor)
62, 162 Optical filter 80a Optical waveguide introduction part 80b Optical waveguide branching part 81 Optical waveguide light receiving part side end face 82 Optical waveguide optical filter side end face 160 Light receiving element module 260 Image sensor module 400, 500 Peltier element 600 Non-contact temperature Total F Subject

Claims (10)

  A light emitting unit that irradiates light to the subject to be measured, a light receiving unit that receives reflected light, diffused light, or transmitted light emitted from the subject, and light having specific optical characteristics from light received by the light receiving unit. A plurality of optical filters to be transmitted; an integrally formed optical waveguide that guides light received by the light receiving unit to the plurality of optical filters; and a light receiving element that detects light having a specific optical characteristic that has passed through each of the optical filters; And a processing means for calculating an evaluation amount of the subject from the calibration curve using the detected reflected light, diffused light or transmitted light.   The nondestructive measuring apparatus according to claim 1, wherein the optical waveguide is formed with a lens formed by bulging a part or all of an end surface facing the light receiving unit.   3. The nondestructive measuring apparatus according to claim 1, wherein the optical waveguide is branched to the plurality of optical filters to form a branched portion that induces reflected light, diffused light, or transmitted light. 4.   The branch portion is formed by a plurality of branch waveguides that individually guide reflected light, diffused light, or transmitted light to the plurality of optical filters, and each branch waveguide has a partial or partial cross-sectional area. The nondestructive measuring apparatus according to claim 3, which is made uniform.   5. The light guide according to claim 1, wherein a light leakage preventing member layer is formed on a surface excluding an end face facing the light receiving portion and an end face facing the optical filter. Nondestructive measuring device.   6. The nondestructive measuring apparatus according to claim 5, wherein the light leakage preventing member layer is a light reflecting material layer.   The nondestructive measuring apparatus according to claim 6, wherein the light reflecting material layer is a metal thin film.   The non-destructive measuring apparatus according to claim 1, wherein the light receiving element includes a temperature adjusting element.   The light-emitting unit includes a plurality of solid-state light-emitting elements having different ranges of wavelengths, and the plurality of optical filters that transmit substantially the same wavelength as the plurality of solid-state light-emitting elements. The nondestructive measuring apparatus according to any one of 1 to 8.   The non-contact thermometer is further arranged in the vicinity of the light receiving unit, the temperature of the subject is measured by the non-contact thermometer, and this is referred to by the processing means. The nondestructive measuring device according to any one of 9.

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