WO2021053895A1 - Dispositif de détection d'humidité - Google Patents

Dispositif de détection d'humidité Download PDF

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Publication number
WO2021053895A1
WO2021053895A1 PCT/JP2020/022419 JP2020022419W WO2021053895A1 WO 2021053895 A1 WO2021053895 A1 WO 2021053895A1 JP 2020022419 W JP2020022419 W JP 2020022419W WO 2021053895 A1 WO2021053895 A1 WO 2021053895A1
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Prior art keywords
light
detection
region
detection device
water content
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PCT/JP2020/022419
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English (en)
Japanese (ja)
Inventor
達男 伊藤
古屋　博之
祐二 寺島
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パナソニックＩｐマネジメント株式会社
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Publication of WO2021053895A1 publication Critical patent/WO2021053895A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content

Definitions

  • the present invention relates to a moisture detection device that detects moisture in a subject.
  • Patent Document 1 describes a measuring instrument that detects the water content of a sample to be measured by using near-infrared light.
  • an LED that emits near-infrared light in a region that overlaps the wavelength of the moisture absorption band and an LED that emits near-infrared light in a region where the emission wavelength region is outside the moisture absorption band are used.
  • the reference sample and the sample under test are irradiated with each near-infrared light.
  • the water content of the sample to be measured is calculated by the arithmetic circuit based on the difference in the intensity of the transmitted light.
  • the water content of the subject is measured in a state where the subject is housed in a drawer provided in the housing.
  • Patent Document 1 In the configuration of the above-mentioned Patent Document 1, in order to accommodate the subject in the drawer at the time of measurement, it is necessary to take a leaf or the like as the subject from a branch and adjust the size to fit in the drawer. In the case of such fracture measurement, for example, it is not possible to measure the time course of the amount of water contained in the leaves while maintaining the state in which the leaves are vegetated on the branches.
  • an object of the present invention is to provide a moisture detection device capable of acquiring the amount of moisture contained in a subject without destroying the subject.
  • the moisture detection device is a projection that projects detection light having a wavelength included in the absorption wavelength band of water onto a housing and a lighting region outside the housing.
  • a unit a light receiving portion that is arranged in the housing and receives the detected light that has passed through the subject existing in the illumination region, and a light receiving portion of the subject based on a detection signal based on the detected light from the light receiving portion. It is provided with a water content calculation unit for calculating the water content.
  • the light projecting unit further irradiates a detection area in the illumination area with visible guide light.
  • the moisture content of the subject can be calculated by irradiating the subject with the detected light.
  • the amount of water contained in the subject can be obtained without destroying the subject during measurement.
  • it is not necessary to destroy the subject at the time of measurement for example, it is possible to measure the change over time in the amount of water contained in the subject while the leaves of the subject are vegetated on the branches.
  • the user can grasp the detection area on the subject, that is, the area where the user himself / herself intends to measure the water content by referring to the irradiation position of the guide light. Therefore, it is possible to smoothly detect the amount of water in the subject.
  • the moisture detection device is a projecting light that is arranged in the housing and the housing and projects detection light having a wavelength included in the absorption wavelength band of water onto the illumination region outside the housing.
  • the light receiving unit includes a surface sensor in which optical sensors are arranged in a matrix, and the surface sensor receives the detection light transmitted through the subject in a detection region in the illumination region, and the detection region receives the detection light transmitted through the subject. It is a region having a predetermined width corresponding to the light receiving region of the surface sensor.
  • the moisture content of the subject can be calculated by irradiating the subject with the detection light as in the first aspect.
  • the amount of water contained in the subject can be obtained without destroying the subject during measurement.
  • it is not necessary to destroy the subject at the time of measurement for example, it is possible to measure the change over time in the amount of water contained in the subject while the leaves of the subject are vegetated on the branches.
  • the detection region which is a region having a predetermined width (plane shape) corresponding to the light receiving region of the surface sensor, the surface sensor receives the detection light transmitted through the subject.
  • the water content of the subject can be measured at one time in the detection region having a predetermined width, so that the water content can be smoothly measured.
  • FIG. 1 is a perspective view schematically showing a configuration of a moisture detection device according to the first embodiment.
  • 2 (a) and 2 (b) are schematic views of the leaf in which the water content is measured by the water content detecting device according to the first embodiment when viewed in the positive direction of the Z axis.
  • FIG. 2C is a schematic view of the transmission window of the head portion according to the first embodiment when viewed in the negative direction of the Z axis.
  • 3A and 3B are schematic views of the configuration for projecting the detection light and the reference light to the illumination region according to the first embodiment, respectively, when viewed in the negative direction of the X-axis.
  • FIG. 1 is a perspective view schematically showing a configuration of a moisture detection device according to the first embodiment.
  • 2 (a) and 2 (b) are schematic views of the leaf in which the water content is measured by the water content detecting device according to the first embodiment when viewed in the positive direction of the Z axis.
  • FIG. 2C is a schematic view of
  • FIG. 3C is a schematic view of the configuration for projecting guide light onto the detection region according to the first embodiment when viewed in the negative direction of the X-axis.
  • FIG. 3D is a schematic view of the configuration for receiving the detected light reflected by the leaves and the reflected light of the reference light in the detection region according to the first embodiment when viewed in the negative direction of the X-axis.
  • FIG. 4 is a graph showing the light absorption coefficient in water according to the first embodiment.
  • FIG. 5 is a block diagram showing a configuration of a moisture detection device according to the first embodiment.
  • FIG. 6 is a flowchart showing the processing of the moisture detection device according to the first embodiment.
  • FIG. 7A is a diagram schematically showing an actual image generated based on the detection signal of the reference light according to the first embodiment.
  • FIG. 7B is a diagram schematically showing a water content distribution image generated by superimposing a contour image and a shading image according to the first embodiment.
  • FIG. 7C is a diagram schematically showing a screen including a water content distribution image and a temperature displayed on a display unit according to the first embodiment.
  • FIG. 8 is a perspective view schematically showing the configuration of the moisture detection device according to the second embodiment.
  • 9 (a) and 9 (b) are schematic views of the leaf in which the water content is measured by the water content detecting device according to the second embodiment when viewed in the positive direction of the Z axis.
  • FIG. 9C is a schematic view of the second embodiment when the transmission window of the head portion is viewed in the negative direction of the Z axis.
  • FIG. 10A is a schematic view of the configuration for projecting guide light onto the detection region according to the second embodiment when viewed in the negative direction of the Y-axis.
  • FIG. 10B is a perspective view schematically showing the configuration of the optical element according to the second embodiment.
  • 10 (c) and 10 (d) show the configurations for receiving the detected light reflected by the leaves and the reflected light of the reference light in the detection region according to the second embodiment in the negative Y-axis direction and the negative X-axis direction, respectively. It is a schematic diagram when viewed.
  • FIG. 10A is a schematic view of the configuration for projecting guide light onto the detection region according to the second embodiment when viewed in the negative direction of the Y-axis.
  • FIG. 10B is a perspective view schematically showing the configuration of the optical element according to the second embodiment.
  • FIG. 11A is a perspective view schematically showing the configuration of the moisture detection device according to the third embodiment.
  • FIG. 11B is a schematic view of a plurality of light sources and diffusers arranged in the housing according to the third embodiment when viewed in the positive direction of the Z axis.
  • FIG. 12 is a block diagram showing the configuration of the moisture detection device according to the third embodiment.
  • FIG. 13A is a perspective view schematically showing the configuration of the moisture detection device according to the modified example.
  • FIG. 13B is a schematic view of a configuration for receiving the detected light reflected by the leaves and the reflected light of the reference light in the detection region according to the modified example when viewed in the negative direction of the X-axis.
  • the subject whose water content is to be measured is a leaf of a plant, but the subject is not limited to this, and may be another part of the plant such as a fruit. Further, the subject may be an animal part, a substance other than a living thing, or the like.
  • the X, Y, and Z axes that are orthogonal to each other are added to each figure.
  • the Z-axis direction is the direction in which the detection light and the reference light emitted from the moisture detection device 1 travel.
  • FIG. 1 is a perspective view schematically showing the configuration of the moisture detection device 1 of the first embodiment.
  • the moisture detection device 1 includes a head unit 10, a control device 20, and a cable 1a for communicably connecting the head unit 10 and the control device 20.
  • the head portion 10 includes a housing 11 for holding each portion included in the head portion 10, a grip portion 12 connected to the housing 11, and a button 13 provided on the grip portion 12.
  • the control device 20 includes a display unit 21.
  • the housing 11 can be carried by gripping the grip portion 12 with one hand. Inside the housing 11, the guide light is projected onto the detection area A1 outside the housing 11, and the detection light and the reference light are projected onto the illumination area A2 outside the housing 11 (see FIG. 5). ) Is placed. Further, inside the housing 11, a light receiving unit 40 (see FIG. 5) that receives the detection light reflected by the leaf LF, which is a subject existing in the illumination region A2, is arranged. The light emitting unit 30 and the light receiving unit 40 are integrally arranged with respect to the housing 11. The configurations of the respective parts included in the light emitting unit 30 and the light receiving unit 40 will be described later with reference to FIGS. 2 (c) to 3 (d).
  • the user holds the grip portion 12 and makes the transparent window 11a located on the positive side of the Z axis of the housing 11 face the leaf LF to be inspected, and presses the button 13.
  • the detection light and the reference light are alternately emitted from the transmission window 11a in the positive direction of the Z axis at predetermined time intervals, and irradiate the surface of the leaf LF.
  • the detection light is near-infrared light having a wavelength of 1450 nm
  • the reference light is near-infrared light having a wavelength of 900 nm.
  • the luminous flux of the detection light and the reference light has a predetermined width in the X-axis direction and the Y-axis direction.
  • the guide light When the button 13 is pressed, the guide light is emitted from the transmission window 11a in the positive direction of the Z axis to irradiate the surface of the leaf LF.
  • the guide light is visible light having a wavelength of 400 nm to 750 nm.
  • the luminous flux of the guide light is substantially circular in the XY plane, and the guide light is convergent light.
  • the detection area A1 is a region of the guide light in the position in the depth direction (Z-axis direction) where the guide light converges most
  • the illumination area A2 is a detection in the position in the depth direction (Z-axis direction) where the guide light converges most.
  • Area of light and reference light The detection area A1 is a point-shaped area
  • the illumination area A2 is a substantially rectangular area whose width in the X-axis direction is longer than the width in the Y-axis direction.
  • the light projecting unit 30 (see FIG. 5) that projects the guide light, the detection light, and the reference light is configured so that the point-shaped detection area A1 is included in the illumination area A2.
  • 2 (a) and 2 (b) are schematic views when the leaf LF is viewed in the positive direction of the Z axis.
  • the user adjusts the distance between the leaf LF and the housing 11 in the Z-axis direction (depth direction) so that the guide light converges most on the surface of the leaf LF to form a point shape. ..
  • the user causes the convergence region (detection region A1) of the guide light to move in the XY plane without changing the distance between the leaf LF and the housing 11.
  • the housing 11 is moved.
  • the user moves the convergence region (detection region A1) of the guide light so as to cover the entire range of the leaf LF, for example, as shown in FIG. 2 (b). ..
  • the detection light and the reference light irradiated to the leaf LF are reflected by the leaf LF in the illumination area A2.
  • the detection light and reference light reflected in the detection area A1 pass through the transmission window 11a and pass through the transmission window 11a, and the light receiving portion 40 in the housing 11 (FIG. 5) to receive light.
  • the light receiving unit 40 outputs a detection signal according to the intensity of the received detection light and the reference light.
  • the detection light is near-infrared light having a wavelength of 1450 nm as described above, and the wavelength of the detection light is included in the absorption wavelength band of water as described later with reference to FIG. Therefore, the amount of light of the detection light reflected by the detection area A1 and received by the light receiving unit 40 changes according to the amount of water in the leaf LF in the detection area A1. Therefore, the amount of water contained in the leaf LF of the detection region A1 can be calculated based on the intensity of the detection light received by the light receiving unit 40.
  • the control unit 110 (see FIG. 5) of the control device 20 calculates the water content of the leaf LF of the detection region A1 based on the detection signal of the detection light from the light receiving unit 40.
  • the reference light is near-infrared light having a wavelength of 900 nm as described above, and the wavelength of the reference light is a wavelength at which absorption by water is low. Therefore, the amount of light of the detection light reflected by the detection area A1 and received by the light receiving unit 40 changes according to the presence or absence and shape of an object in the detection area A1 regardless of the amount of water in the detection area A1. Therefore, according to the intensity of the reference light received by the light receiving unit 40, the irradiation range of the reference light to the leaf LF, that is, the range in which the leaf LF exists in the illumination region A2 is specified according to the presence or absence and the shape of the leaf LF. it can.
  • the control unit 110 (see FIG. 5) of the control device 20 specifies the irradiation range of the reference light on the leaf LF based on the detection signal of the reference light from the light receiving unit 40.
  • the control unit 110 of the control device 20 generates a water content distribution image by mapping the calculation result of the water content to the irradiation range of the reference light, that is, the region of the leaf LF, and displays the generated water content distribution image and the like. Displayed in unit 21. In this way, the moisture detection for the leaf LF is completed.
  • FIG. 2C is a schematic view of the transmission window 11a of the head portion 10 when viewed in the negative direction of the Z axis.
  • the transmission window 11a is a plate-shaped member made of resin or glass and transmitting light.
  • a plurality of light sources 31, a plurality of light sources 32, a light source 33, a condensing lens 34, a photodetector 41, a condensing lens 42, and a radiation temperature sensor 61 are located on the negative side of the transmission window 11a on the Z axis. , Is arranged in the housing 11.
  • the light sources 31, 32, 33 and the condenser lens 34 constitute a light projecting unit 30 (see FIG. 5) that projects the detection light, the reference light, and the guide light toward the outside.
  • the photodetector 41 and the condenser lens 42 constitute a light receiving unit 40 (see FIG. 5) that receives the detection light and the reference light that have passed through the leaf LF.
  • the light emitting unit 30 and the light receiving unit 40 are arranged inside the housing 11. It should be noted that not all of the light projecting unit 30 need to be arranged inside the housing 11, and for example, the light projecting unit 30 is arranged on the outer surface of the housing 11 so that a part of the light projecting unit 30 is exposed to the outside. May be good.
  • the light source 31 and the light source 32 are arranged alternately side by side in the X-axis direction.
  • the light sources 31 and 32 emit the detection light and the reference light in the positive direction of the Z axis, respectively.
  • the light source 33 emits the guide light in a direction slightly inclined from the positive direction of the Z axis to the negative direction of the Y axis.
  • the condenser lens 34 is arranged on the positive side of the Z axis of the light source 33 in a slightly tilted state.
  • the photodetector 41 is arranged between the light sources 31 and 32 and the light source 33 in the XY plane.
  • the condenser lens 42 is arranged on the positive side of the Z axis of the photodetector 41.
  • 3 (a) and 3 (b) are schematic views of a configuration in which the detection light and the reference light are projected onto the illumination region A2 when viewed in the negative direction of the X-axis, respectively.
  • the light sources 31 and 32 are composed of, for example, a semiconductor laser, an LED, or a white light source with a filter that passes through a specific wavelength.
  • FIG. 3C is a schematic view of a configuration in which the guide light is projected onto the detection region A1 when viewed in the negative direction of the X-axis.
  • the light source 33 is composed of, for example, a semiconductor laser, an LED, or a white light source with a filter that passes through a specific wavelength.
  • the condensing lens 34 converts the guide light emitted from the light source 33 into convergent light, and condenses the light in the detection region A1 separated from the condensing lens 34 in the positive direction of the Z axis by a predetermined distance.
  • the traveling direction of the guide light emitted by the light source 33 is shown as the Z-axis positive direction, but in reality, it is slightly tilted in the Y-axis negative direction with respect to the Z-axis direction. ing.
  • FIG. 3D is a schematic view of a configuration in which the detection light reflected by the leaf LF and the reflected light of the reference light are received in the detection region A1 when viewed in the negative direction of the X-axis.
  • the photodetector 41 is, for example, a photodiode.
  • the photodetector 41 has detection sensitivity in the infrared wavelength band.
  • the photodetector 41 is an indium gallium arsenide-based photodiode, and has a detection sensitivity of a wavelength of 900 nm to 1700 nm so that the detection light and the reference light can be detected.
  • the photodetector 41 receives the detection light and the reference light reflected in the detection region A1 of the leaf LF in the light receiving region 41a, and outputs an electric signal based on the received light amount.
  • the condensing lens 42 is configured to condense the detection light and the reference light generated from the detection region A1 of the leaf LF and form an image on the light receiving region 41a of the photodetector 41. Therefore, the detection light and the reference light reflected in the illumination area A2 other than the detection area A1 are not focused on the light receiving area 41a, and only the detection light and the reference light reflected in the point-shaped detection area A1 are present. The light is focused on the light receiving region 41a.
  • the detection sensitivity of the photodetector 41 is a wavelength of 900 nm to 1700 nm, and the wavelength of the guide light is the wavelength of visible light. Therefore, even if the guide light reflected in the detection region A1 is guided to the light receiving region 41a of the photodetector 41, the guide light is prevented from affecting the detection signal of the photodetector 41.
  • the guide light is detected so that the detection region A1 on which the object surface is formed can be identified by the condenser lens 42. It is irradiated so as to concentrate on the smallest spot in the region A1.
  • the user can adjust the distance between the housing 11 and the leaf LF to a distance at which the detected light can be appropriately imaged on the photodetector 41 by referring to the irradiation state of the guide light.
  • FIG. 4 is a graph showing the light absorption coefficient in water.
  • the horizontal axis represents the wavelength and the vertical axis represents the absorption coefficient.
  • the absorption coefficient tends to increase as the wavelength increases. Therefore, when the wavelength of the detection light is set to 1450 nm as described above and the detection light is applied to the detection region A1 of the leaf LF, the amount of light of the detection light passing through the leaf LF is the moisture content of the leaf LF in the detection region A1. It changes according to the amount. That is, the amount of light of the detection light passing through the leaf LF decreases as the water content of the leaf LF in the detection region A1 increases, and increases as the water content of the leaf LF in the detection region A1 decreases. Therefore, as shown in FIG. 3D, when the detection light reflected in the detection area A1 is received by the photodetector 41, the detection signal output by the photodetector 41 is the leaf LF in the detection area A1. It is a value that reflects the amount of water in.
  • the reference light generates a real image 210 reflecting the presence / absence and shape of the leaf LF, and generates a contour image 211 of the leaf LF based on the real image 210, as will be described later with reference to FIG. 7A.
  • the reference light reflected in the detection region A1 needs to be received by the photodetector 41 regardless of the amount of water. Therefore, the wavelength of the reference light is set so that it is absorbed by water low and is included in the detection sensitivity of the photodetector 41.
  • the wavelength of the reference light is set to 900 nm, which is near the lower limit of the wavelength band of the detection sensitivity of the photodetector 41.
  • FIG. 5 is a block diagram showing the configuration of the moisture detection device 1.
  • the head portion 10 of the moisture detection device 1 includes a plurality of light sources 31, a drive unit 51 connected to the plurality of light sources 31, a plurality of light sources 32, and a drive unit 52 connected to the plurality of light sources 32.
  • the plurality of light sources 31 emit detection light according to the drive signal input from the drive unit 51.
  • the plurality of light sources 32 emit reference light according to the drive signal input from the drive unit 52.
  • the light source 33 emits guide light in response to a drive signal input from the drive unit 53.
  • the photodetector 41 receives the detection light and outputs an electric signal based on the detection light to the signal processing unit 54 as a detection signal, receives the reference light and processes the electric signal based on the reference light as a detection signal. Output to unit 54.
  • the signal processing unit 54 performs processing such as conversion of the detection light output from the photodetector 41 and the detection signal based on the reference light into a digital signal.
  • the radiation temperature sensor 61 is a non-contact type temperature sensor, and measures the temperature in the vicinity of the detection region A1 by measuring the amount of infrared radiation emitted from the leaf LF.
  • the radiation temperature sensor 61 outputs an electric signal based on the measured temperature to the signal processing unit 55 as a detection signal.
  • the signal processing unit 55 performs processing such as conversion of the detection signal output from the radiation temperature sensor 61 into a digital signal.
  • the acceleration sensor 71 detects the acceleration in the orthogonal three-axis directions (the XYZ-axis directions in FIG. 1) and outputs the acceleration in the three-axis directions as a detection signal.
  • the gyro sensor 72 detects the angular velocities around the three orthogonal axes (around the XYZ axes in FIG. 1) and outputs the angular velocities around the three axes as a detection signal.
  • the acceleration sensor 71 and the gyro sensor 72 constitute a movement detection unit 70 for detecting the movement of the detection region A1 with respect to the leaf LF.
  • the button 13 is a button whose switch is turned on only while it is pressed.
  • the control device 20 of the moisture detection device 1 includes a control unit 110, a storage unit 120, a display unit 21, and a communication interface 130.
  • the control unit 110 is composed of, for example, a CPU or a microcomputer, and controls each unit in the head unit 10 and each unit in the control device 20 according to a control program stored in the storage unit 120.
  • the storage unit 120 is composed of, for example, a RAM, stores a control program, and is used as a work area during control processing.
  • the display unit 21 is composed of, for example, a liquid crystal panel, and displays an image based on a signal output from the control unit 110.
  • the control unit 110 receives a signal relating to the on / off of the button 13, and while the button 13 is in the on state, the detection signal output from the signal processing units 54 and 55 via the communication interfaces 80 and 130 and the acceleration sensor 71. And the detection signal output from the gyro sensor 72 is received, and the received detection signal is stored in the storage unit 120.
  • the control unit 110 is provided with a position calculation unit 111, a water content calculation unit 112, and an image generation unit 113 as functions by a control program.
  • the position calculation unit 111 calculates the moving position of the detection area A1 based on the detection signal of the acceleration sensor 71 and the detection signal of the gyro sensor 72.
  • the water content calculation unit 112 calculates the water content contained in the detection region A1 of the leaf LF based on the detection signal of the detection light.
  • the image generation unit 113 generates a real image 210 of the leaf LF (see FIG. 7A) based on the detection signal of the reference light, and contour image 211 (see FIG. 7A) based on the real image 210. To generate.
  • the image generation unit 113 is based on the moving position of the detection region A1 calculated by the position calculation unit 111, the water content calculated by the water content calculation unit 112, and the contour image 211, and the water content distribution image 230 (FIG. 7 (b)) is generated.
  • the processing of the control unit 110 and each image will be described later with reference to FIGS. 6 to 7 (c).
  • the position calculation unit 111, the water content calculation unit 112, and the image generation unit 113 may be configured as hardware instead of functions by the control program.
  • FIG. 6 is a flowchart showing the processing of the moisture detection device 1.
  • the control unit 110 determines whether or not a measurement start instruction has been input by pressing the button 13 based on the signal relating to the on / off of the button 13 (S11).
  • the control unit 110 causes the light source 31 and the light source 32 to emit light, and starts irradiating the illumination region A2 of the detection light and the reference light (S12).
  • the control unit 110 alternately switches the light emission of the light source 31 and the light source 32 at predetermined switching intervals.
  • the switching cycle of the light source 31 and the light source 32 is set to, for example, several ⁇ sec to several tens of ⁇ sec.
  • the control unit 110 causes the light source 33 to emit light and starts irradiating the detection region A1 of the guide light (S13).
  • the control unit 110 continuously emits the guide light while the button 13 is pressed.
  • the control unit 110 starts acquiring the detection signal of the detection light output from the photodetector 41 at the irradiation timing of the detection light (S14). Subsequently, the control unit 110 starts acquiring the detection signal of the reference light output from the photodetector 41 at the irradiation timing of the reference light (S15). Subsequently, the control unit 110 starts acquiring the temperature detection signal output from the radiation temperature sensor 61 (S16). Subsequently, the control unit 110 acquires a moving position detection signal output from the acceleration sensor 71 and the gyro sensor 72 (S17).
  • the control unit 110 stores the detection signals acquired in steps S14 to S16 in the storage unit 120 in association with the detection signal of the moving position acquired in the position measurement processing of step S17. .. That is, the control unit 110 stores the detection light of the detection light, the detection signal of the reference light, and the detection signal of the moving position in the storage unit 120 in association with each other for each switching cycle of the detection light and the reference light.
  • the control unit 110 determines whether or not the measurement end instruction has been input because the button 13 is no longer pressed (S18). When the button 13 is still pressed (S18: NO), the control unit 110 continues the process started in steps S12 to S17. When the processing is continued, the control unit 110 keeps storing each detection signal in the storage unit 120 in association with the detection signal of the moving position. On the other hand, when the button 13 is no longer pressed (S18: YES), the control unit 110 ends the process started in steps S12 to S17 (S19).
  • the control unit 110 calculates the moving position of the detection area A1, the amount of water contained in the leaf LF, and the temperature of the leaf LF based on the detection signal stored in the storage unit 120 (S20). Specifically, the position calculation unit 111 of the control unit 110 calculates the movement position of the detection area A1 at each time based on the detection signal of the movement position stored in the storage unit 120 in the switching cycle. The water content calculation unit 112 of the control unit 110 calculates the water content of the leaf LF at each movement position of the detection area A1 based on the detection signal of the detection light stored in the storage unit 120 for each movement position of the detection area A1. To do. The control unit 110 calculates the temperature of the entire leaf LF based on the temperature detection signal stored in the storage unit 120 for each movement position of the detection area A1.
  • the image generation unit 113 of the control unit 110 is based on the detection signal of the reference light stored in the storage unit 120 at each time and the moving position at the time calculated by the position calculation unit 111.
  • a real image 210 and a contour image 211 are generated as shown in (a), and further, based on the water content of the leaf LF at each moving position and the contour image 211, the water content as shown in FIG. 7 (b).
  • a distribution image 230 is generated (S21).
  • FIG. 7A is a diagram schematically showing the actual image 210 generated based on the detection signal of the reference light.
  • the image generation unit 113 of the control unit 110 generates the actual image 210 based on the detection signal of the reference light stored in the storage unit 120 for each movement position of the detection area A1.
  • the real image 210 is, for example, a monochrome image.
  • the image generation unit 113 generates a contour image 211 (irradiation range of reference light) corresponding to the contour of the real image 210 from the real image 210.
  • FIG. 7B is a diagram schematically showing a water content distribution image 230 generated by superimposing the contour image 211 and the shading image 220.
  • the image generation unit 113 of the control unit 110 generates a shade image 220 based on the water content of the leaf LF at each movement position of the detection region A1 calculated in step S20 of FIG.
  • the shade image 220 is, for example, a color image according to the amount of water. Then, the image generation unit 113 generates the water content distribution image 230 by superimposing the contour image 211 and the shading image 220.
  • control unit 110 displays the water content distribution image 230 of the leaf LF generated in step S21 and the temperature of the leaf LF calculated in step S20 as shown in FIG. 7 (c). Is displayed in (S22). In this way, the process of the moisture detection device 1 is completed.
  • the light emitting unit 30 and the light receiving unit 40 are arranged in the housing 11.
  • the light projecting unit 30 projects detection light having a wavelength included in the absorption wavelength band of water onto the illumination region A2 located outside the housing 11, and the light receiving unit 40 receives the detection light reflected by the leaf LF. To do.
  • the water content calculation unit 112 calculates the water content of the leaf LF based on the detection signal based on the detection light from the light receiving unit 40.
  • the light projecting unit 30 further irradiates the detection region A1 with visible guide light.
  • the water content of the leaf LF can be calculated by grasping the housing 11 and irradiating the leaf LF with the detection light.
  • the amount of water contained in the leaf LF can be obtained without destroying the leaf LF at the time of measurement.
  • it is not necessary to destroy the leaf LF at the time of measurement for example, it is possible to measure the change over time in the amount of water contained in the leaf LF while the leaf LF is vegetated on the branch.
  • the user can grasp the detection area A1 on the leaf LF, that is, the area where the user himself / herself intends to measure the water content by referring to the irradiation position of the guide light. Therefore, it is possible to smoothly detect the water content of the leaf LF.
  • the guide light is convergent light, and the detection area A1 is a region of guide light when the guide light is most converged.
  • the user can visually grasp that the target portion of the leaf LF for which the water content is to be measured should be positioned at the convergence position of the guide light in the depth direction (Z-axis direction).
  • the housing 11 is configured to be portable by holding the grip portion 12. As a result, the user can easily measure the water content of the leaf LF by grasping the grip portion 12.
  • the detected light is infrared light having a wavelength of 800 nm or more. As shown in FIG. 4, light having a wavelength of 800 nm or more is easily absorbed by water. Therefore, by setting the wavelength of the detection light to 800 nm or more, the amount of light of the detection light can be changed according to the amount of water contained in the leaf LF, and the amount of water in the leaf LF can be detected.
  • the wavelength of the detected light is set to 950 nm or more. As shown in FIG. 4, the absorption coefficient of water with respect to light becomes high in the wavelength range of 950 nm or more. Therefore, by setting the wavelength of the detection light to 950 nm or more, the amount of light of the detection light can be significantly changed according to the amount of water contained in the leaf LF. Therefore, the water content of the leaf LF can be efficiently detected.
  • the wavelength of the detected light is set in the vicinity of the wavelength of 1450 nm. As shown in FIG. 4, the absorption coefficient of water with respect to light peaks at a wavelength of 1450 nm. Therefore, by setting the wavelength of the detection light to the vicinity of this wavelength, the amount of light of the detection light can be significantly changed according to the amount of water contained in the leaf LF. Therefore, the water content of the leaf LF can be detected more efficiently.
  • the condenser lens 42 forms an image of the detection light generated from the detection region A1 in the illumination region A2 on the light receiving region 41a of the photodetector 41. As a result, the detection light generated from each detection area A1 is guided to the light receiving area 41a according to the movement of the detection area A1. Therefore, the water content of the leaf LF in each detection region A1 can be measured.
  • the photodetector 41 is a photodiode
  • the detection area A1 is a point-shaped area corresponding to the light receiving area 41a of the photodetector 41 (photodiode).
  • the light projecting unit 30 irradiates the guide light so that the detection region A1 on which the object surface is formed by the condensing lens 42 can be identified.
  • the user can adjust the distance between the housing 11 and the leaf LF to a distance at which the detected light can be appropriately imaged on the photodetector 41 by referring to the irradiation state of the guide light. Therefore, the user can smoothly proceed with the operation for measuring the water content of the leaf LF.
  • the image generation unit 113 generates a water content distribution image 230 showing the water content distribution in the leaf LF, as shown in FIG. 7B, based on the calculation result by the water content calculation unit 112. As a result, the user can instantly grasp the distribution of the water content on the leaf LF by referring to the water content distribution image 230 generated by the image generation unit 113.
  • the image generation unit 113 generates the water content distribution image 230 based on the detection result by the movement detection unit 70 and the calculation result by the water content calculation unit 112.
  • a water content distribution image 230 showing the distribution of the water content of the leaf LF in the scanning range is generated. Therefore, even when the detection region A1 is smaller than the leaf LF region, by scanning the detection region A1 over the entire leaf LF, a water content distribution image 230 showing the water content distribution can be generated for the entire leaf LF. .. Therefore, the user can smoothly grasp the distribution of the water content of the entire leaf LF. Further, the user can grasp the distribution of water in the specific range by scanning the detection region A1 in the desired specific range on the leaf LF. In this way, the user can grasp the water distribution of the leaf LF even in an arbitrary range.
  • the acceleration of the housing 11 can be detected, and according to the gyro sensor 72, the angular velocity of the housing 11 can be detected. Therefore, the movement detection unit 70 including the acceleration sensor 71 and the gyro sensor 72 can detect the movement speed and the movement direction of the detection area A1, and thereby can appropriately calculate the movement position of the detection area A1. Therefore, the image generation unit 113 can appropriately associate the moving position of the detection region A1 with the calculation result by the water content calculation unit 112 at the moving position, and can accurately generate the water content distribution image 230.
  • the light projecting unit 30 projects a reference light having a wavelength low absorption by water onto the illumination region A2, and the image generating unit 113 is based on the detection signal of the photodetector 41 based on the reference light reflected by the leaf LF.
  • the range of reference light irradiation on the leaf LF is specified.
  • the image generation unit 113 generates the contour image 211 of the real image 210 as shown in FIG. 7A.
  • the image generation unit 113 generates the water content distribution image 230 by mapping the calculation result of the water content by the water content calculation unit 112 to the specified irradiation range.
  • the image generation unit 113 generates the water content distribution image 230 by superimposing the shading image 220 showing the water content distribution on the contour image 211.
  • the inner and outer boundaries of the leaf LF can be defined based on the detection signal of the photodetector 41 based on the reference light. Therefore, by mapping the calculation result of the water content by the water content calculation unit 112 to the inner range of the defined leaf LF, that is, the irradiation range of the reference light on the leaf LF, the distribution of the water content on the leaf LF
  • the water content distribution image 230 reflecting the above can be smoothly generated.
  • the photodetector 41 has a detection sensitivity in the wavelength band of infrared rays, and the reference light can be detected by the photodetector 41 and is set near the lower limit of the wavelength band of the detection sensitivity of the photodetector 41. There is. As a result, both the detection light and the reference light can be appropriately detected by the common photodetector 41 without arranging a filter for blocking the visible guide light.
  • the radiation temperature sensor 61 measures the temperature in the vicinity of the detection area A1 and outputs a detection signal based on the measured temperature.
  • the control unit 110 calculates the temperature of the entire leaf LF based on the measurement result of the radiation temperature sensor 61, and displays the calculated temperature on the display unit 21 as shown in FIG. 7 (c).
  • the leaf LF evaporates by photosynthetic activity, and the temperature of the leaf LF decreases due to the transpiration. Therefore, the user can grasp the state of the transpiration action of the leaf LF by referring to the temperature of the leaf LF displayed on the display unit 21.
  • the user can, for example, determine whether or not to give fertilizer to the strain having the leaf LF having a low transpiration effect, and check whether or not the leaf LF is weakened due to the outbreak of pathogens. ..
  • the user can also calculate the energy at which the photosynthetic activity was actually performed by acquiring the temperature of the leaf LF on the time axis.
  • the guide light is convergent light, and the detection light and the reference light reflected by the point-shaped detection region A1 where the guide light converges are received by the light receiving region 41a of the square-shaped photodetector 41. ..
  • the leaf LF is irradiated with the two sheet-shaped guide lights, and the detection light and the reference light reflected in the linear detection region A1 extending in the X-axis direction where the two guide lights intersect are the X-axis.
  • Light is received by the light receiving region 43a (see FIG. 9C) of the photodetector 43 extending in the direction.
  • FIG. 8 is a perspective view schematically showing the configuration of the moisture detection device 1 of the second embodiment.
  • the detection light and the reference light are alternately emitted from the transmission window 11a in the positive direction of the Z axis at predetermined time intervals to irradiate the surface of the leaf LF, as in the first embodiment.
  • the surface of the leaf LF is irradiated with two guide lights from the transmission window 11a.
  • the luminous fluxes of the two guide lights both have a narrow width in the Y-axis direction and have a shape of diffusing in the X-axis direction.
  • the detection region A1 of the second embodiment is set so that the width in the Y-axis direction is narrow and the length in the X-axis direction is longer than the width of a general leaf LF.
  • the illumination area A2 is the same as that of the first embodiment.
  • the light projecting unit 30 (see FIG. 5) that projects the guide light, the detection light, and the reference light is configured so that the linear detection area A1 is included in the illumination area A2.
  • 9 (a) and 9 (b) are schematic views of the leaf LF when viewed in the positive direction of the Z axis.
  • the user adjusts the distance between the leaf LF and the housing 11 in the Z-axis direction (depth direction) so that the two guide lights overlap each other on the surface of the leaf LF.
  • the user causes the overlapping region (detection region A1) of the two guide lights to move in the Y-axis direction without changing the distance between the leaf LF and the housing 11.
  • the housing 11 is moved.
  • the user covers the entire range of the leaf LF with the overlapping region (detection region A1) of the two guide lights. Move to.
  • the detection light and the reference light reflected by the linear detection region A1 pass through the transmission window 11a and are received by the light receiving unit 40 (see FIG. 5) in the housing 11.
  • the light receiving unit 40 outputs a detection signal according to the intensity of the received detection light and the reference light.
  • the control unit 110 (see FIG. 5) of the control device 20 generates a water content distribution image 230 (see FIG. 7 (b)), and as shown in FIG. 7 (c), the generated water content distribution image. 230 and the like are displayed on the display unit 21.
  • FIG. 9C is a schematic view of the transmission window 11a of the head portion 10 when viewed in the negative direction of the Z axis.
  • the lens 44 and the radiation temperature sensor 61 are arranged in the housing 11.
  • the light sources 31, 32, 33, the collimator lens 35, and the optical element 36 constitute a light projecting unit 30 (see FIG. 5) that projects the detection light, the reference light, and the guide light toward the outside.
  • the photodetector 43 and the condenser lens 44 constitute a light receiving unit 40 (see FIG. 5) that receives the detection light and the reference light that have passed through the leaf LF.
  • the light emitting unit 30 and the light receiving unit 40 are arranged inside the housing 11. It should be noted that the light projecting unit 30 does not necessarily have to be all arranged in the housing 11, and for example, the light projecting unit 30 is arranged on the outer surface of the housing 11 so that a part of the light projecting unit 30 is exposed to the outside. May be good.
  • the light source 33 on the positive side of the Y-axis emits the guide light in a direction slightly inclined from the positive direction of the Z-axis to the negative direction of the Y-axis, and the light source 33 on the negative side of the Y-axis emits the guide light from the positive direction of the Z-axis to the Y-axis. It emits in a direction slightly tilted in the positive direction.
  • the collimator lens 35 is arranged on the Z-axis positive side of the light source 33, and the optical element 36 is arranged on the Z-axis positive side of the collimator lens 35.
  • the collimator lens 35 and the optical element 36 are arranged in a slightly tilted state like the corresponding light source 33.
  • the photodetector 43 is arranged between the light sources 31 and 32 and the light source 33 on the positive side of the Y axis in the XY plane.
  • the condenser lens 44 is arranged on the positive side of the Z axis of the photodetector 43.
  • FIG. 10A is a schematic view of a configuration in which the guide light is projected onto the detection region A1 when viewed in the negative direction of the Y-axis.
  • FIG. 10B is a perspective view schematically showing the configuration of the optical element 36.
  • the collimator lens 35 converts the guide light emitted from the light source 33 into parallel light.
  • the optical element 36 diffuses the guide light converted into parallel light by the collimator lens 35 in the X-axis direction.
  • two incident surfaces 36a and 36b having different inclinations are formed on the negative side of the Z-axis of the optical element 36.
  • the guide light is evenly incident on the two incident surfaces 36a and 36b from the negative side of the Z axis.
  • the guide light incident on the incident surface 36a is bent in the positive direction of the X-axis and is emitted from the exit surface 36c on the positive side of the Z-axis.
  • the guide light incident on the incident surface 36b is bent in the negative direction of the X-axis and is emitted from the exit surface 36c on the positive side of the Z-axis.
  • the guide light emitted from the transmission window 11a becomes a sheet and heads toward the detection area A1.
  • the light source 33, the collimator lens 35, and the optical element 36 are installed in the housing 11 in a slightly tilted state so that the traveling directions of the two guide lights approach each other as shown in FIG. The lens.
  • FIGS. 10 (c) and 10 (d) show a configuration in which the detection light reflected by the leaf LF and the reflected light of the reference light are received in the detection region A1 in the negative Y-axis direction and the negative X-axis direction, respectively. It is a schematic diagram. In FIGS. 10 (c) and 10 (d), how the detection light and the reference light generated from the detection region A1 are imaged in the light receiving region 43a of the photodetector 43 is shown by a alternate long and short dash line.
  • the photodetector 43 is a line sensor in which optical sensors are arranged in the X-axis direction.
  • the detection sensitivity of the photodetector 43 is the same as that of the first embodiment.
  • the photodetector 43 receives the detection light and the reference light reflected in the detection region A1 of the leaf LF in the light receiving region 43a, and outputs an electric signal based on the amount of light received at each light receiving position in the X-axis direction.
  • the condenser lens 44 is configured to collect the detection light and the reference light generated from the detection region A1 of the leaf LF and form an image on the light receiving region 43a of the photodetector 43.
  • the detection light and the reference light reflected in the illumination area A2 other than the detection area A1 are not focused on the light receiving area 43a, and only the detection light and the reference light reflected in the linear detection area A1 are present.
  • the light is focused on the light receiving region 43a.
  • the two guide lights can be identified so that the detection region A1 on which the object surface is formed by the condenser lens 44 can be identified. Are irradiated so as to overlap in the detection area A1. Thereby, the user can adjust the distance between the housing 11 and the leaf LF to a distance at which the detected light can be appropriately imaged on the photodetector 43 by referring to the irradiation states of the two guide lights.
  • the control unit 110 transmits a detection signal based on the detection light and a detection signal based on the reference light for each position on the detection region A1 corresponding to each optical sensor of the photodetector 43 which is a line sensor. , Get each at the same time. Further, in steps S14 to S17 of FIG. 6, the control unit 110 outputs the detection signals from the acceleration sensor 71 and the gyro sensor 72 and each optical sensor of the photodetector 43 for each switching cycle of the detection light and the reference light. The detected detection light and the detection signal of the reference light are associated with each other and stored in the storage unit 120.
  • the control unit 110 is a photodetector based on the detection signals of the acceleration sensor 71 and the gyro sensor 72 stored in the storage unit 120 in step S20 of FIG.
  • the position on the detection area A1 corresponding to each of the 43 optical sensors is detected.
  • the control unit 110 generates the water content distribution image 230 in steps S20 and S21 as in the first embodiment, and displays the generated water content distribution image 230 on the display unit 21 in step S22.
  • the water content of the leaf LF can be calculated by irradiating the leaf LF with the detection light as in the first embodiment. As a result, the amount of water contained in the leaf LF can be obtained without destroying the leaf LF at the time of measurement.
  • the photodetector 43 is a line sensor, and the detection area A1 is a linear area corresponding to the light receiving area 43a of the photodetector 43 (line sensor).
  • the detection signals of the detection light and the reference light extending linearly in the X-axis direction from the detection region A1 are acquired at once, and therefore, the first embodiment 1 It is possible to acquire a detection signal equivalent to the detection signal acquired by scanning the point-shaped detection region A1 in the X-axis direction at one time. Therefore, in the second embodiment, the water content can be measured more smoothly.
  • the linear detection area A1 is irradiated with two visible guide lights.
  • the user can grasp the detection area A1 on the leaf LF, that is, the area where the user himself / herself intends to measure the water content by referring to the irradiation position of the guide light. Therefore, it is possible to smoothly detect the water content of the leaf LF.
  • the two guide lights have a sheet shape, and the detection region A1 is a region of the guide light when the two guide lights overlap each other. As a result, the user can visually grasp that the target portion of the leaf LF for which the water content is to be measured should be positioned at a position where the two guide lights overlap in the depth direction (Z-axis direction).
  • the detection light and the reference light reflected by the detection region A1 are received by the photodetectors 41 and 43 arranged in the housing 11, but in the third embodiment, they are transmitted through the detection region A1.
  • the detected light and the reference light are received by the photodetector 45 (see FIG. 12) arranged in the housing 11.
  • the photodetector 45 see FIG. 12
  • FIG. 11A is a perspective view schematically showing the configuration of the moisture detection device 1 of the third embodiment.
  • FIG. 11B is a schematic view of a plurality of light sources 31 and 32 arranged in the housing 11 and a diffuser 37 when viewed in the positive direction of the Z axis.
  • the housing 11 of the head portion 10 is configured to be handleable and portable as in the first embodiment.
  • the housing 11 of the third embodiment is formed with a recess 11b having a predetermined width in the Z-axis direction and extending in an XY plane at an intermediate position in the Z-axis direction.
  • a plurality of light sources 31 and 32 and a diffuser 37 are arranged in the housing 11 on the Z-axis positive side of the recess 11b.
  • the plurality of light sources 31 and 32 are arranged in a matrix in the XY plane.
  • the diffuser 37 is arranged on the negative side of the Z axis of the plurality of light sources 31 and 32, and uniformly irradiates the leaf LF with the detection light emitted from the plurality of light sources 31 and the reference light emitted from the plurality of light sources 32. Let me.
  • the user accommodates the leaf LF as the subject in the recess 11b and presses the button 13.
  • the detection light and the reference light emitted from the plurality of light sources 31 and 32 are emitted in the negative direction of the Z axis from the emission end face 11c located on the positive side of the Z axis of the recess 11b, and the leaf LF housed in the recess 11b.
  • the entire area of is irradiated.
  • the detection light and the reference light irradiated to the leaf LF pass through the leaf LF and are guided into the housing 11 from the incident end surface 11d located on the negative side of the Z axis of the recess 11b.
  • the detection light and the reference light guided from the incident end surface 11d into the housing 11 are received by the photodetector 45 (see FIG. 12) arranged in the housing 11.
  • FIG. 12 is a block diagram showing the configuration of the moisture detection device 1 of the third embodiment.
  • the leaf LF housed in the recess 11b is irradiated with the detection light and the reference light together with each part of the moisture detection device 1, and the irradiated detection light and the reference light pass through the leaf LF and the photodetector 45. It is shown that light is received in the light receiving region 45a of.
  • the head portion 10 of the moisture detection device 1 includes a plurality of light sources 31, a drive unit 51 connected to the plurality of light sources 31, a plurality of light sources 32, and a drive unit 52 connected to the plurality of light sources 32. It includes a diffuser 37, a photodetector 45, a signal processing unit 54 connected to the photodetector 45, a button 13, and a communication interface 80.
  • the light sources 31 and 32 and the diffuser 37 constitute a light projecting unit 30 that projects the detection light and the reference light toward the outside.
  • the photodetector 45 constitutes a light receiving unit 40 that receives the detection light and the reference light that have passed through the leaf LF.
  • the light emitting unit 30 and the light receiving unit 40 are arranged inside the housing 11. It should be noted that not all of the light projecting unit 30 need to be arranged inside the housing 11, and for example, the light projecting unit 30 is arranged on the outer surface of the housing 11 so that a part of the light projecting unit 30 is exposed to the outside. May be good.
  • the plurality of light sources 31 and 32 project the detection light and the reference light to the illumination region A2 in the recess 11b, respectively.
  • the illumination area A2 is an area extended in the XY plane.
  • the detection light and the reference light irradiated to the illumination area A2 pass through the leaf LF arranged in the illumination area A2 and are received by the light receiving area 45a of the photodetector 45.
  • the illumination region A2 to which the detection light and the reference light are irradiated and the detection region A1 to be detected by the photodetector 45 are the same region.
  • the light sources 31, 32 and the diffuser 37 are arranged and configured so that when the general leaf LF is arranged in the recess 11b, the detection region A1 is wider than the entire range of the leaf LF. According to the configuration of FIG. 11B, the detection area A1 has a rectangular shape.
  • the photodetector 45 is a surface sensor in which optical sensors are arranged in a matrix in an XY plane.
  • the photodetector 45 is, for example, a CCD image sensor or a CMOS image sensor.
  • the size of the light receiving region 45a of the photodetector 45 is about the same as the detection region A1 in the XY plane.
  • the photodetector 45 has detection sensitivity only in the infrared wavelength band. When the photodetector 45 has detection sensitivity not only in the infrared wavelength band but also in the visible light wavelength band, a filter that transmits only light in the infrared wavelength band to the front side (Z-axis positive side) of the photodetector 45. Should be placed.
  • the movement detection unit 70 (accelerometer 71 and gyro sensor 72) may be omitted.
  • the position of each optical sensor (pixel) on the photodetector 45 corresponds to each position on the detection area A1.
  • the control unit 110 transmits one or more detection signals (detection signals based on the detection light and the reference light) from each optical sensor (pixel) on the photodetector 45. It is stored in the storage unit 120 times.
  • the detection signal is stored only once
  • the water content calculation unit 112 of the control unit 110 calculates the water content from the detection signal based on the detection light for each pixel position.
  • the water content calculation unit 112 of the control unit 110 calculates the water content from the average value of the detection signals based on the detection light for each pixel position.
  • the image generation unit 113 of the control unit 110 generates the contour image 211 of the leaf LF from the detection signal based on the reference light at each pixel position, and maps the water content of each pixel position to the generated contour image 211.
  • Moisture distribution image 230 is generated.
  • the control unit 110 causes the display unit 21 to display the generated water content distribution image 230.
  • the water content of the leaf LF can be calculated by irradiating the leaf LF with the detection light as in the first embodiment. As a result, the amount of water contained in the leaf LF can be obtained without destroying the leaf LF at the time of measurement.
  • the photodetector 45 is a surface sensor in which optical sensors are arranged in a matrix, and the detection area A1 is an area having a predetermined width (plane) corresponding to the light receiving area 45a of the photodetector 45 (surface sensor). ..
  • the water content of the leaf LF can be measured at one time in the detection region A1 having a predetermined width.
  • the detection signals of the detection light and the reference light from the detection region A1 covering the entire range of the general leaf LF are acquired at once, one of the leaf LFs as in the first and second embodiments. It is possible to acquire a detection signal equivalent to the detection signal acquired by scanning the detection area A1 corresponding to the unit at a time. Therefore, in the third embodiment, the water content can be measured more smoothly.
  • the configuration of the moisture detection device 1 can be changed in various ways in addition to the configurations shown in the first to third embodiments.
  • the wavelength of the detected light is set near the wavelength of 1450 nm, but it may be set near the wavelength of 980 nm or 1940 nm.
  • the absorption coefficient of water with respect to light increases in a peak shape even at wavelengths of 980 nm and 1940 nm. Therefore, even when the wavelength of the detection light is set in the vicinity of these wavelengths, the amount of light of the detection light can be remarkably changed according to the amount of water contained in the leaf LF.
  • the wavelength of the detection light When the wavelength of the detection light is set small in the wavelength band of the near infrared light (for example, when the wavelength is set to 980 nm), the difference in wavelength from the reference light becomes small, so that the photodetectors 41 and 43 , 45 can be set to a relatively narrow detection sensitivity.
  • the wavelength of the detected light when the wavelength of the detected light is set large in the wavelength band of the near infrared light (for example, when the wavelength is set to 1940 nm), the water absorption coefficient becomes large, so that it depends on the amount of water contained in the leaf LF. Therefore, the amount of detected light can be significantly changed.
  • the wavelength of the reference light is set to around 900 nm, but other wavelengths with low absorption by water may be used.
  • the reference light is not limited to near-infrared light, but may be visible light having a wavelength of 400 nm to 750 nm, or ultraviolet light having a wavelength of 400 nm or less.
  • the light detectors 41, 43, and 45 that receive the reference light are configured to have detection sensitivity also in the wavelength band of the reference light that is visible light or ultraviolet light. To.
  • the wavelength band of the reference light when the reference light is visible light, the wavelength band of the reference light is set so as not to overlap with the wavelength band of the guide light. Then, a filter for blocking light in the wavelength band of the guide light and transmitting the detection light and the reference light is arranged in front of the photodetectors 41 and 43. As a result, it is possible to prevent the guide light, which is unnecessary for calculating the water content, from becoming stray light and entering the photodetectors 41 and 43.
  • the detection light and the reference light are received by one photodetector, but may be received by different photodetectors.
  • the detection light and the reference light captured in the housing 11 are guided to separate photodetectors by separating the optical paths by, for example, a dichroic mirror.
  • the guide light is converged on the point-shaped detection region A1, and in the second embodiment, the two sheet-shaped guide lights are overlapped with each other in the detection region A1 on the line.
  • the guide light may be applied to the leaf LF as parallel light, and in the second embodiment, the guide light may be irradiated to the leaf LF.
  • the leaf LF may be irradiated with one sheet-shaped guide light. In this case as well, the user can visually confirm which position on the leaf LF is the target for measuring the water content.
  • the detection region A1 is set to be longer than the width of the general leaf LF in the X-axis direction, but the width is not limited to this, and the width of the general leaf LF in the X-axis direction is not limited to this. May be set to be shorter than. In this case as well, the user can measure the water content of the entire leaf LF by moving the housing 11 so that the detection region A1 moves not only in the Y-axis direction but also in the X-axis direction. Further, in the third embodiment, the detection region A1 is set to be wider than the entire range of the general leaf LF in the XY plane, but is not limited to this, and is generally in the XY plane.
  • the user can measure the water content of the entire leaf LF by moving the housing 11 so that the detection region A1 moves in the X-axis direction and the Y-axis direction.
  • a plurality of light sources 31 and 32 and a diffuser 37 are used in order to irradiate the illumination region A2 having a spread in the XY plane with the detection light and the reference light.
  • the detection light emitted from one light source 31 may be diffused and irradiated to the illumination region A2, and the reference light emitted from one light source 32 may be diffused and irradiated to the illumination region A2.
  • the light source 31 that emits the detection light and the light source 32 that emits the reference light are used in order to irradiate the illumination region A2 with the detection light and the reference light, but the present invention is limited to this. Instead, a light source that alternately emits the detection light and the reference light at predetermined time intervals may be used.
  • the light emitting unit 30 and the light receiving unit 40 may include a mirror that reflects light, a filter that blocks predetermined light, a diffraction grating that separates light, another lens, and the like.
  • a condenser lens may be arranged in front of the photodetector 45.
  • the collimator lens 35 and the optical element 36 are used in order to convert the shape of the guide light emitted from the light source 33 into a sheet shape, but the present invention is not limited to this, and the collimator lens 35 is parallel.
  • the guide light converted into light may be incident on the side surface of the cylindrical lens and converted into a sheet shape.
  • the guide light converted into parallel light by the collimator lens 35 may be incident on a diffuser plate provided with a diffraction grating and diffused in a line shape.
  • the detection light and the reference light reflected by the leaf LF in the detection region A1 are received by the photodetectors 41 and 43, but the detection light transmitted through the leaf LF in the detection region A1 and the detection light
  • the reference light may be received by the photodetectors 41 and 43.
  • the light emitting unit 30 and the light receiving unit 40 are arranged so as to face each other.
  • the contour image 211 showing the irradiation range of the leaf LF and the shade image 220 showing the distribution of the water content are superimposed to show the water content.
  • the distribution image 230 is generated, the water content distribution image 230 may be generated only by the shade image 220 showing the distribution of the water content.
  • the water content distribution may be expressed by a bar graph having different heights. Good.
  • the condenser lens 42 formed an image of the detection light and the reference light generated from the point-shaped detection region A1 in the light receiving region 41a of the photodetector 41. As shown in (b), the detection light and the reference light generated from the planar detection region A1 may be imaged in the planar light receiving region 46a.
  • FIG. 13A is a perspective view schematically showing the configuration of the moisture detection device 1 according to this modified example. Similar to the first embodiment, the guide light converges in the point-shaped irradiation region P in the illumination region A2. On the other hand, the detection region A1 is set as a planar region including the irradiation region P.
  • FIG. 13B is a schematic view of a configuration in which the detection light reflected by the leaf LF and the reflected light of the reference light are received in the detection region A1 according to this modified example when viewed in the negative direction of the X-axis.
  • FIG. 13B shows how the detection light and the reference light generated from the detection region A1 are imaged in the light receiving region 46a of the photodetector 46 by a chain double-dashed line.
  • the photodetector 46 is a surface sensor in which the photosensors are arranged in a matrix in the XY plane, like the photodetector 45 of the third embodiment.
  • the photodetector 46 is, for example, a CCD image sensor or a CMOS image sensor.
  • the guide light is applied to the irradiation region P so that the detection region A1 on which the object surface is formed by the condenser lens 47 can be identified. It is being irradiated toward.
  • the detection signals of the detection light and the reference light from the planar detection region A1 are acquired at once, so that the detection signals of the planar detection region A1 are acquired at once.
  • the water content of leaf LF can be measured.
  • the water content distribution image 230 and the temperature are displayed on the display unit 21 as shown in FIG. 7 (c), but the present invention is not limited to this.
  • the water content distribution image 230 and the temperature may be displayed at a timing desired by the user.
  • the moisture detection device 1 is composed of the head unit 10 and the control device 20 connected by the cable 1a, but the head unit 10 and the control device 20 are integrally combined.
  • Moisture detection device 1 may be configured.
  • the configuration of the control device 20 may be arranged in the housing 11 of the head unit 10, and the display unit 21 may be provided on the outer surface of the housing 11.
  • the light emitting unit 30 and the light receiving unit 40 are arranged in the housing 11 that can be handled and carried, the amount of water contained in the leaf LF can be measured without destroying the leaf LF at the time of measurement. ..
  • the water content is calculated based on the detection signal based on the detection light, but when the surface shape and surface roughness of the detection region A1 fluctuate greatly, another water content As the calculation means, the water content may be calculated based on the ratio of the detection signal based on the detection light and the reference signal based on the reference light.
  • the absorption coefficient at the wavelength of the detected light is larger than the absorption coefficient at the wavelength of the reference light. Therefore, when the reference light emitted from the light source 32 is applied to the detection region A1, the light of the reference wavelength (reference light) is reflected by the shape of the detection region A1 regardless of the presence or absence of water in the detection region A1. It is reflected under the influence of scattering on the surface. On the other hand, when the detection light emitted from the light source 31 irradiates the detection region A1, if there is no moisture in the detection region A1, the light of the absorption wavelength (detection light) is the light of the detection wavelength A1 like the light of the reference wavelength.
  • the detection region A1 When there is moisture in the detection region A1, the light of the absorption wavelength (detection light) is absorbed by the moisture. Therefore, the absorption of the moisture is integrated with the reflection due to the shape of the detection region A1 and the scattering on the surface, and the photodetector 41 The amount of light received by is reduced. Therefore, by taking the ratio of the detection signal based on the detection light and the reference signal based on the reference light, it is possible to eliminate the influence of reflection and scattering on the surface due to the shape of the detection region A1.
  • the fact that the light of the reference wavelength and the light of the absorption wavelength are absorbed by water at different degrees is utilized to make noise due to reflection due to the surface shape, scattering generated on the surface of the substance, and the like.
  • the water content of the detection region A1 may be calculated in a state where the components are suppressed.
  • Moisture detection device 11 Housing 30 Floodlights 31, 32, 33 Light source (floodlight) 34 Condensing lens (light projector) 35 Collimator lens (light projector) 36 Optical element (light projecting unit) 37 Diffuser (light projector) 40 Light receiving part 41 Photodetector (light receiving part, photodiode) 41a Light receiving area 42 Condensing lens (light receiving part) 43 Photodetector (light receiving part, line sensor) 43a Light receiving area 44 Condensing lens (light receiving part) 45 Photodetector (light receiving part, surface sensor) 45a Light receiving area 46 Photodetector (light receiving part, surface sensor) 46a Light receiving area 47 Condensing lens (light receiving part) 70 Movement detection unit 71 Accelerometer (movement detection unit) 72 Gyro sensor (movement detector) 112 Moisture content calculation unit 113 Image generation unit 211 Contour image (reference range) 230 Moisture distribution image A1 Detection area A2 Illumination area

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un dispositif de détection d'humidité (1) qui comprend : un boîtier (11); une unité de projection de lumière qui est disposée dans le boîtier (11) et qui fait saillie vers une région d'éclairage (A2) à l'extérieur du boîtier (11), une lumière de détection à une longueur d'onde incluse dans la bande de longueur d'onde d'absorption de l'eau; une unité de réception de lumière qui est disposée dans le boîtier (11) et qui reçoit la lumière de détection qui a traversé une feuille (LF) présente dans la région d'éclairage (A2); et une unité de calcul de quantité d'humidité qui calcule la quantité d'humidité dans la feuille (LF) sur la base d'un signal de détection sur la base de la lumière de détection provenant de l'unité de réception de lumière. L'unité de projection de lumière émet en outre une lumière de guidage visible vers une région de détection (A1) à l'intérieur de la région d'éclairage (A2).
PCT/JP2020/022419 2019-09-17 2020-06-05 Dispositif de détection d'humidité WO2021053895A1 (fr)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0688749A (ja) * 1992-09-05 1994-03-29 Horiba Ltd 分光器
CN101975759A (zh) * 2010-09-07 2011-02-16 中国农业大学 透射式无损检测植物叶片含水量的装置和方法
JP2017083425A (ja) * 2016-07-19 2017-05-18 パナソニックＩｐマネジメント株式会社 植物水分量評価装置及び植物水分量評価方法
US20180059014A1 (en) * 2015-04-27 2018-03-01 Flir Systems, Inc. Moisture measurement device with thermal imaging capabilities and related methods
US20180143073A1 (en) * 2015-02-05 2018-05-24 Verifood, Ltd. Spectrometry system applications
US20180202927A1 (en) * 2015-09-25 2018-07-19 Apple Inc. Light-based shielding detection
US20190154573A1 (en) * 2017-11-17 2019-05-23 Hyundai Motor Company Device and method for water-proofing test
JP2019148454A (ja) * 2018-02-26 2019-09-05 パナソニックＩｐマネジメント株式会社 成分検知センサ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0688749A (ja) * 1992-09-05 1994-03-29 Horiba Ltd 分光器
CN101975759A (zh) * 2010-09-07 2011-02-16 中国农业大学 透射式无损检测植物叶片含水量的装置和方法
US20180143073A1 (en) * 2015-02-05 2018-05-24 Verifood, Ltd. Spectrometry system applications
US20180059014A1 (en) * 2015-04-27 2018-03-01 Flir Systems, Inc. Moisture measurement device with thermal imaging capabilities and related methods
US20180202927A1 (en) * 2015-09-25 2018-07-19 Apple Inc. Light-based shielding detection
JP2017083425A (ja) * 2016-07-19 2017-05-18 パナソニックＩｐマネジメント株式会社 植物水分量評価装置及び植物水分量評価方法
US20190154573A1 (en) * 2017-11-17 2019-05-23 Hyundai Motor Company Device and method for water-proofing test
JP2019148454A (ja) * 2018-02-26 2019-09-05 パナソニックＩｐマネジメント株式会社 成分検知センサ

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