Abstract: There is provided a method for determining presence of a person comprising a) receiving IR sensor data (50) during a first time period from a thermopile and using the IR sensor data to determine an IR background signal baseline (51) for the time period, and determining a variability of the IR sensor data (50), b) using the IR background signal baseline (51) and the variability of the IR background signal level to determine a threshold (52) with a value higher than the background signal baseline (51), and in such a way so that greater variability in the IR background signal (50) results in a higher threshold (52), then c) receiving further IR sensor data (50) during a second time period, which is after the first time period, and using the further IR sensor data (50), and the threshold (52) determined in step b) to determine that a person is present when the further IR sensor data (50) comprises a value that is higher than the threshold.

Abstract: An example object of the present invention is to provide a bolometer-type detector capable of reducing heat transfer between pixels. A bolometer-type detector according to an example aspect of the present invention includes a plurality of pixels, and at least includes: a substrate, a heat insulating layer provided on the substrate, bolometer films provided on individual pixels on the heat insulating layer, and a wiring for signal output connected to contact electrodes provided in contact with the bolometer films, wherein the wiring for signal output is disposed in a layer different from the bolometer films, and the heat insulating layer between adjacent pixels is removed at least partially in the depth direction and in a region of a length of 50% or longer and a width of 100 nm or wider of a closed curve that surrounds each bolometer film.

Abstract: A device including a plurality of epitaxial chips is disclosed. An epitaxial chip can have one or more of a light source and a detector, where the detector can be configured to measure the optical properties of the light emitted by a light source. In some examples, one or more epitaxial chips can have one or more optical properties that differ from other epitaxial chips. The epitaxial chips can be dependently operable. For example, the detector located on one epitaxial chip can be configured for measuring the optical properties of light emitted by a light source located on another epitaxial chip by way of one or more optical signals. The collection of epitaxial chips can also allow detection of a plurality of laser outputs, where two or more epitaxial chips can have different material and/or optical properties.

Abstract: A terahertz element of an aspect of the present disclosure includes a semiconductor substrate, first and second conductive layers, and an active element. The first and second conductive layers are on the substrate and mutually insulated. The active element is on the substrate and electrically connected to the first and second conductive layers. The first conductive layer includes a first antenna part extending along a first direction, a first capacitor part offset from the active element in a second direction as viewed in a thickness direction of the substrate, and a first conductive part connected to the first capacitor part. The second direction is perpendicular to the thickness direction and first direction. The second conductive layer includes a second capacitor part, stacked over and insulated from the first capacitor part. The substrate includes a part exposed from the first and second capacitor parts.

Abstract: A stove guard having a data processing unit and a heat sensor arrangement for receiving heat radiation from objects located in a given field of view and for delivering the detector signals indicative of the received heat radiation to the data processing unit. The heat sensor arrangement is arranged to generate detector signals differently corresponding to the heat radiation received from a central area of the field of view than to the heat radiation received from a circumferential area of the field of view.

Abstract: A stove guard comprises a data processing unit (101) and a temperature sensor arrangement (102) for receiving thermal radiation from objects in a specific field of view and for supplying detector signals representative of the received thermal radiation to the data processing unit (101). The temperature sensor arrangement (102) includes at least three detector elements (201, 202, 203), their sensitivity bands located at different positions along an optical radiation wavelength axis. The sensitivity band of one of said detector elements is limited to a wavelength range of less than 1.2 micrometers.

Abstract: In one example, a method comprises: transmitting a first signal to transfer a first portion of a first charge from a first photodiode to a first charge sensing unit to obtain a first measurement result and transmitting a second signal to transfer a second portion of the first charge from the first photodiode to a second charge sensing unit to obtain a second measurement result. The timing of transmission of the first signal and the second signal are based on the indirect time-of-flight measurement operation. The method further comprises performing the indirect time-of-flight measurement operation based on the first measurement result and the second measurement result; transmitting a third signal to transfer a second charge from a second photodiode to the second charge sensing unit via the first photodiode to obtain a third measurement result; and performing a D sensing operation based on the third measurement result.

Abstract: The invention relates to a transmission for a drive train of a motor vehicle, having a shaft section, to which a torque measurement device, designed to measure a torque applied to the shaft section is attached, wherein an electronics unit connected to the torque measurement device is received radially within the shaft section. The invention further relates to a drive train for a motor vehicle, having a transmission.

Abstract: Objects of the present disclosure include providing a technique which can efficiently guide an unmanned aerial vehicle to a particular part of a target object. Provided is a control device for an unmanned aerial vehicle including a camera. The control device comprises a bright spot detection unit configured to detect, from an image captured by camera, a bright spot generated by a laser pointer; a flight control unit configured to perform, based on position of the bright spot in the image, flight control over the unmanned aerial vehicle. In such structure, the camera detects the bright spot, generated by the irradiation of spot-type indicating laser beam from the total station, on a wall surface, and the flight control over the unmanned aerial vehicle is performed in a manner that the unmanned aerial vehicle follows the bright spot.

Abstract: A film thickness measuring apparatus includes a displacement sensor, and a film thickness calculator that includes a first processor, a second processor, and a third processor. The displacement sensor detects displacement of a sheet in its thickness direction at a location opposite to a portion of a terahertz scanner from which a terahertz wave is applied to a conveyance path. In accordance with a detection signal provided by the displacement sensor, the first processor determines the speed of displacement of the sheet in its thickness direction while the sheet is conveyed along the conveyance path. In accordance with the speed of displacement, the second processor corrects a scan waveform acquired by the terahertz scanner. In accordance with the peaks of the intensity of the terahertz wave that appear in the scan waveform corrected by the second processor, the third processor calculates the thickness of a film formed on the sheet.

Abstract: A recording material characteristic detecting device that irradiates a first light and a second light to a recording material carried along a predetermined carrying path and detects a transmitted light generated when the first light transmits the recording material and a reflection light generated when the second light is reflected by the recording material, and detects a characteristic of the recording material, comprises: a reflection light source that irradiates the second light toward the carrying path; a reference plate for reflection light arranged oppositely to the reflection light source across the carrying path to reflect the second light; and a light detector arranged oppositely to the reference plate for reflection light across the carrying path to detect at least a reflection light generated in response to reflection of the second light. The reference plate has a higher reflectivity to the second light than a reflectivity to the first light.

Abstract: There is disclosed a handheld air flow velocity measurement probe that includes a bridge circuit assembly having an airflow velocity sensor that is a resistance temperature detector (RTD) and a digitally controlled resistive element to dynamically adjust and maintain the resistance of the velocity sensor within the overheat temperature predefined range. The velocity measurement also uses a separate temperature sensor to sense the temperature of the air or gas flow. A humidity sensor is also included remote from the other sensors to measure humidity in the gas flow to be measured. All of the above described components are housed at a probe tip instead of a base as in most standard handheld probes and the digital interface at the probe tip allows the user to replace a bulky, expensive telescoping antenna with stackable extender scheme.

Abstract: A vision laser receiver having a sensing surface with a fixed geometry such that laser light received by the sensing surface will illuminate a particular section of the sensing surface and the precise elevation and/or tilt of the laser receiver will be determined from the illumination of the sensing surface.

Abstract: In one embodiment, an electronic assembly includes a flexible circuit board formed into a curved shape that is configured to be substantially concentric with a viewer's eye. The electronic assembly further includes a plurality of facets coupled to a side of curved shape of the flexible circuit board that is configured to face the viewer's eye. Each facet has a planar face, one or more emitters configured to emit light towards the viewer's eye, and one or more receptors configured to detect the emitted light after it has been reflected back towards the electronic assembly from a retina of the viewer's eye. Each face is normal to a line pointing towards a center area of the viewer's eye when the curved shape is substantially concentric with the viewer's eye. Each facet is individually addressable such that the plurality of facets are configurable to detect a center of gaze of the viewer.

Abstract: A detection device includes: a detector having an inherent detection area to detect entry of a detection target into the inherent detection area; a restrictor for restricting the inherent detection area to a specific set detection area; a body having a detector opening part; a detector fixer for fixing the detector; and a restrictor fixer whose position is fixed to the detector fixer and to which the restrictor is fixed, the restrictor fixer configured so that a relative position between the detector and the restrictor is fixed by fixing a position of the restrictor to the detector fixer via the restrictor fixer. The detector and the restrictor whose positions are thus fixed are assembled to the body so that a circumferential edge of the detector opening part is located outside the set detection area while the restriction of the inherent detection area by the restrictor is maintained.

Abstract: Devices and methods for 3D sensing are provided. The device comprising an optical device configured and operable to produce at least one structured light pattern, the optical device comprising a light source unit configured and operable to generate one or more light beams along predetermined one or more optical paths, and a diffractive optical unit accommodated in said one or more optical paths, at the output of said light source unit such that the diffractive optical unit faces the light source unit, the diffractive optical unit being non-periodic and two-dimensional and comprising at least one resonance-domain diffractive optical element configured to create 2D spatially variable pattern in a predetermined operative wavelength range, the diffractive optical unit being thereby configured and operable as a beam shaper for said one or more light beams to thereby create said at least one structured light pattern.

Abstract: A method is for making an optical detector device. The method may include forming a reflector layer carried by a substrate, forming a first dielectric layer over the reflector layer, and forming a graphene layer over the first dielectric layer and having a perforated pattern therein.

Abstract: Methods, systems, and apparatus for controlling smart devices are described. In one aspect a method includes receiving image data for an image captured by a camera of a mobile device of a user and determining that the image depicts at least one of a smart device or a physical control for the smart device. In response to determining that that the image depicts a smart device or a physical control for the smart device, identifying one or more user interface controls for controlling the smart device, and generating and presenting, at a display of the mobile device, the one or more user interface controls for controlling the smart device. The method can further include detecting, at the display of the mobile device, user interaction with at least one of the one or more user interface controls, and controlling the smart device based on the detected user interaction.

Abstract: A new approach to graphene-enabled plasmonic resonant structures in the THz is demonstrated in a hybrid graphene-metal design in which the graphene acts as a gate-tunable inductor, and metal acts as a capacitive reservoir for charge accumulation. A large resonant absorption in graphene can be achieved using the metal-graphene plasmonic scheme, and the peak can approach 100% in an optimized device, ideal for graphene-based THz detectors. Using high mobility graphene (?>50000 cm2V?1s?1) will allow anomalously high resonant THz transmission (near 100%) through ultra-subwavelength graphene-filled metallic apertures at a resonance frequency that is gate tunable. This metal-graphene plasmonic scheme enables near perfect tunable THz filter or modulator.

Abstract: A solid state image sensor includes light receiving sections formed in a two-dimensional array, in which the light receiving section in one unit is formed such that a lens provided on a light receiving surface, a first light receiving element configured to receive light incident from an object via the lens, and a second light receiving element provided in a layer below the first light receiving element and configured to receive light incident from the object via the lens and the first light receiving element and acquire information about a distance to the object configure a stacked structure.

Abstract: An inexpensive thermopile temperature detector is particularly adapted to monitoring of electrical equipment, such as a power bus bar, within an enclosed area such as a cabinet. The detector may have a plastic housing, a thermopile sensor and a plastic Fresnel lens. Each sensor also includes a calibrated element such that, but for calibration, the same sensor may be used for various applications for different target sizes and distance or, more generally, with respect to effective target percentage of field of view.

Abstract: A method is provided for monitoring the exposure to radiation of medical personnel during an X-ray examination of an examination object with an X-ray apparatus. A monitoring unit is activated and continuously scans a first three-dimensional volume that includes a region directly irradiated by the X-ray beam, for objects. When an object is detected, automatic evaluation is performed as to whether the object is a human body part that does not correspond to the examination object and a signal or a display is output if a human body part is determined inside the three-dimensional volume that does not correspond to the examination object.

Abstract: The wearable device incorporates a device for measuring the ambient temperature, which comprises an infrared sensor. In an ambient temperature measurement mode a control circuit activates the infrared sensor several times so that it can supply a plurality of measurement signals over a certain period of time. A circuit for processing measurement signals is then arranged in order to supply temperature values corresponding to at least a portion of the measurement signals and to take a mean for at least a portion of these temperature values to obtain an average temperature value that is considered to be representative of the ambient temperature. The invention also relates to a method for measuring the ambient temperature that can be implemented by means of this wearable device.

Abstract: The signal processing board includes a plurality of signal processing circuits configured to process signals output from a plurality of pixels of an infrared detecting element. The signal processing board includes an element placement area where the infrared detecting element is placed, and a circuit placement area positioned outside the element placement area to surround the element placement area when viewed from a direction orthogonal to the signal processing board. The signal processing board includes a plurality of insulating layers that are stacked on a surface side opposing the semiconductor substrate. A plurality of signal processing circuits are placed in the circuit placement area. A heat-conducting layer is placed to be positioned on at least one of the insulating layers and in the element placement area, in the signal processing board. The heat-conducting layer has a heat conductivity that is higher than a heat conductivity of the insulating layers.

Abstract: An infrared detecting device includes: an infrared sensor that has one or more infrared detection elements arranged in one or more columns; and an IC chip that performs signal processing on a signal output from the infrared sensor. The infrared sensor and the IC chip are generally juxtaposed in a direction along a scan rotation axis of the infrared sensor.

Abstract: Various techniques are disclosed for providing a device attachment configured to releasably attach to and provide infrared imaging functionality to mobile phones or other portable electronic devices. For example, a device attachment may include a housing with a tub on a rear surface thereof shaped to at least partially receive a user device, an infrared sensor assembly disposed within the housing and configured to capture thermal infrared image data, and a processing module communicatively coupled to the infrared sensor assembly and configured to transmit the thermal infrared image data to the user device. Thermal infrared image data may be captured by the infrared sensor assembly and transmitted to the user device by the processing module in response to a request transmitted by an application program or other software/hardware routines running on the user device.

Abstract: One embodiment provides a device, including: a composite image sensor, including: a wiring layer that processes electrical signals; a first photodiode layer configured to convert a first light wave signal into an electrical signal; and a second photodiode layer configured to convert a second light wave signal into an electrical signal; wherein the first photodiode layer and the second photodiode layer are separated by a predetermined distance. Other aspects are described and claimed.

Abstract: The problem to be solved by the present invention is to provide an infrared microscope with good measuring accuracy and less crosstalk. The infrared microscope 10 comprises a light source 12, an irradiating unit 14 for irradiating the infrared light from the light source to a sample 16, a focusing unit 18 for focusing the infrared light transmitted through or reflected by the sample 16, and a detector 20 for detecting the focused infrared light. The irradiating unit 14 comprises a first aperture 24, and the first aperture is disposed at a position where the infrared light from the light source passes therethrough. The focusing unit 18 comprises a second aperture 30, and the second aperture is disposed at an imaging position of the infrared light at the first aperture 24. The first aperture has a plurality of holes, and the holes are disposed at intervals corresponding to the arrangement of the light-receiving elements provided in the detector 20 to detect the infrared light as a detecting light.

Abstract: An image processing apparatus that operates in a first power state or a second power state in which power consumption is smaller than in the first power state includes a detection unit that includes regions in which an object is detected, an analysis unit configured to analyze results of detection obtained in the plurality of regions, wherein the analysis unit enters a power saving mode in the second power state, a control unit that causes the analysis unit to return from the power saving state in a case where an object has been detected in any of the plurality of regions included in the detection unit in the second power state, and a power control unit that, in a case where the analysis unit determines that an object has approached the image processing apparatus, shifts the image processing apparatus from the second power state to the first power state.

Abstract: The present invention provides a touch switch attachable on a wall. The touch switch, attachable on a wall, comprises: a switch box unit which is inserted into an embedded box formed on a wall; a back cover unit which is inserted inside the switch box unit and has a plurality of PCBs stacked and placed; a fixing plate unit which is coupled to the switch box unit and fixes the back cover unit; and an LCD touch pad unit which is fixed on one end of the back cover unit passing through the fixing plate unit, is electrically connected to the plurality of PCBs, and is for inputting switching operation information to the plurality of PCBs by means of capacitive touch.

Abstract: An inspection apparatus including: a substrate holder configured to hold a substrate; an aperture device; and an optical system configured to direct a first measurement beam of radiation onto the substrate, the first measurement beam having a first intensity distribution, and configured to direct a second focusing beam of radiation onto the substrate at a same time as the first measurement beam is directed on the substrate, the second focusing beam having a second intensity distribution, wherein at least part of the second intensity distribution is spatially separated from the first intensity distribution at least at the substrate and/or the aperture device.

Abstract: In a method for producing a capacitive micromachined ultrasonic transducer having a cell of a structure having a first electrode and a vibration membrane containing a second electrode provided with a cavity interposed between the first electrode and the second electrode, a first sacrificial layer is formed on the first electrode. A second sacrificial layer is formed on a portion corresponding to a part of a cavity is formed on the first sacrificial layer, and then an insulating layer configuring a part of the vibration membrane is formed on the second sacrificial layer. The second sacrificial layer is removed by etching through an opening formed in the insulating layer, and then a part of the first sacrificial layer is removed.

Abstract: Hyperspectral imaging sensors that can readily switch between multiple common aperture imagers, and are more compact and lightweight than previous hyperspectral sensor designs.

Abstract: A MEMS device includes a bolometer attached to a silicon wafer by a base portion of at least one anchor structure. The base portion comprises a layer stack having a metal-insulator-metal (MIM) configuration such that the base portion acts as a resistive switch such that, when the first DC voltage is applied to the patterned conductive layer, the base portion transitions from a high resistive state to a low resistive state, and, when the second DC voltage is applied to the patterned conductive layer, the base portion transitions from a high resistive state to a low resistive state.

Abstract: Disclosed is an imaging device employing a measurement zone directed at a target, where the imaging device can be used in conjunction with a misalignment analysis feature. The imaging device can capture first and second images at different times. The first and second images may be compared, such as by comparing a location of the measurement zone of the imaging device in the first image with a location of the measurement zone of the imaging device in the second image. Based on the comparison, a misalignment indication of the imaging device relative to the target can be provided.

Abstract: A smart-home device may include a user interface having a first operating mode and a second operating mode, and a four-channel thermopile. A processing system may be programmed to receive an indication of a user presence near the smart-home device from the thermopile, and determine a motion signature based on the responses from the thermopile. The processing system may also be programmed to process the determined motion signature to determine the presence of a condition warranting user interface entry into the first mode from the second mode, and cause the user interface to transition from the first mode to the second mode based on the determined motion signature.

Abstract: Visualization of a functional sequence of a medical apparatus includes accepting a mathematical model describing at least the medical apparatus, and accepting a log file. The log file includes at least one value of at least one electrical signal of the medical apparatus during the functional sequence. At least one state variable of the medical apparatus is determined as a function of the mathematical model and the log file, and the at least one state variable of the medical apparatus is visualized.

Abstract: The invention relates to a device for thermal adaptation, comprising at least one surface element arranged to assume a determined thermal distribution, said surface element comprising a first heat conducting layer, a second heat conducting layer, said first and second heat conducting layers being mutually thermally isolated by means of an intermediate insulation layer, wherein at least one thermoelectric element is arranged to generate a predetermined temperature gradient to a portion of said first layer. The invention also relates to an object such as a craft.

Abstract: Methods and systems for controlling movement of detectors having multiple detector heads are provided. One system includes a gantry, a patient support structure supporting a patient table thereon, and a plurality of detector units. At least some of the detector units are rotatable to position the detector units at different angles relative to the patient table. The imaging system further includes a detector position controller configured to control the position of the rotatable detector units, wherein at least some of the rotatable detector units positioned adjacent to each other have an angle of rotation to allow movement of the rotatable detector units a distance greater than a gap between adjacent rotatable detector units. The detector position controller is configured to calculate at least one of field of view avoidance information or collision avoidance information to determine an amount of movement for one or more of the rotatable detector units.

Abstract: According to an exemplary embodiment, a method of forming a MEMS device is provided. The method includes the following operations: providing a substrate; forming a first layer formed of titanium nitride over the substrate; and forming a second layer formed of titanium over the first layer. According to an exemplary embodiment, a MEMS device is provided. The device includes: a substrate; a first layer formed of titanium nitride over the substrate; and a second layer formed of titanium over the first layer. According to an exemplary embodiment, a getter structure is provided. The structure includes: a first layer formed of titanium nitride over a substrate; and a second layer formed of titanium over the first layer.

Abstract: A thermostat may include a proximity sensor and a temperature sensor. The thermostat may also include a sensor mount assembly containing the proximity sensor, the temperature sensor, and a first alignment feature. The thermostat may additionally include a lens assembly having a first area, a second area, and a second alignment feature, where the second area includes a Fresnel lens, and the first area is thinner than the second area. The thermostat may further include a front cover where the outward-facing surface of the lens assembly is shaped to continuously conform to a curvature of the front cover.

Abstract: The present invention relates to an integrated infrared sensor device, comprising a sensor substrate and a filter substrate. The sensor substrate has a back surface and a front surface opposite the back surface, in which the back surface has a cavity defined therein and the front surface has at least one infrared sensing element formed therein or arranged thereon, covered with a cap for protecting the at least one sensing element, e.g. against mechanical damage and dust, and/or against stray radiation. The filter substrate is arranged on the back surface of the sensor substrate such that the filter substrate at least partially covers the cavity. The filter substrate is adapted in shape and composition to transmit infrared radiation and to attenuate radiation in at least part of the visible light spectrum.

Abstract: A zoom lens system includes: a primary image forming lens group that forms light from an object side into an intermediate image and a relay lens group that forms light from the intermediate image into a final image. The primary image forming lens group includes, in order from the object side, a first fixed lens group G1 with negative refractive power, a stop St, and a second fixed lens group G2 with positive refractive power, and the relay lens group includes, in order from the object side, a third fixed lens group G3 with negative refractive power, a first moving lens group G4 with positive refractive power, and a second moving lens group G5 with positive refractive power.

Abstract: The present invention discloses an optical testing device includes a base, a holder, and a number of illuminating modules. The base defines a sliding groove extending along a first direction in a top surface thereof. The holder slides along a second direction on the top surface of the base. The interval regulator is connected to the holder. The illuminating modules are slidably received in the sliding groove. Each of the illuminating modules comprises a circuit board and a single lighting element set on the circuit board. The interval regulator drives the holder to slide along a second direction so that a distance between the holder and the illuminating modules is regulated. The first direction is not parallel to the second direction.

Abstract: A sensor assembly includes: a sensor including pixels that are aligned in a predetermined direction, the pixels being for detecting an electromagnetic wave; and a lens that forms, in a detector plane on the sensor, an image according to the electromagnetic wave, wherein the lens has an f-number in a first direction and an f-number in a second direction, the f-number in the first direction being different from the f-number in the second direction, the first direction being orthogonal to the predetermined direction in a plane parallel to the detector plane, and the second direction being the predetermined direction. For example, the f-number of the lens in the first direction is smaller than the f-number of the lens in the second direction.

Abstract: A method is provided for removing material from a workpiece using a material removal device and a measurement device. The method includes measuring a first dimension of the workpiece at a location with the measurement device. A jet of water is directed from the material removal device to the location to remove material from the workpiece at the location. A second dimension of the workpiece at the location is measured with the measurement device. The first dimension is compared to the second dimension to determine a measured thickness of the material removed from the workpiece at the location.

Abstract: In one embodiment, an optical device having a first and second group of the plurality of sensors is disclosed. The first and second group of the plurality of sensors may have a first and second center of gravity region respectively. The plurality of sensors may be arranged such that the first and second center of gravity region may be substantially overlapping so as disturbances created by a time varying field on the first and second group of the plurality of sensors may be substantially similar in magnitude. In another embodiment, a fiber optic transmission system having first and second groups of the plurality of sensors being arranged around a center of gravity region is disclosed. In yet another embodiment, an optical transceiver having first and second sets of the plurality of sensors arranged such that center of gravity of each group is formed at the center region is disclosed.

Abstract: In an infrared detection element 15, a first substrate 36 is bonded to a front side of a pyroelectric substrate 20. Since the thermal expansion coefficient of the first substrate 36 is lower than that of the pyroelectric substrate 20, deformation of the pyroelectric substrate 20 due to thermal expansion can be suppressed by the first substrate 36. Further, since a thermal expansion coefficient difference D is 8.9 ppm/K or less, the thermal expansion coefficient between the first substrate 36 and the pyroelectric substrate 20 is not excessively large, and this can suppress deformation of the infrared detection element 15 due to the thermal expansion coefficient difference between the first substrate 36 and the pyroelectric substrate 20.

Abstract: A method for detecting infrared radiation by using an array of bolometers. The following steps are used to read a bolometer of the array of bolometers: biasing the bolometer at a predetermined voltage in order to make current flow through the bolometer; subtracting a common-mode current from the current that flows through the bolometers; and producing a voltage by integrating the difference between the current that flows through the bolometers and the common-mode current.

Abstract: A rain sensor equipped to a transparent substrate includes a light emitter emitting irradiation lights toward the transparent substrate, light receivers receiving reflected lights of the irradiation lights being reflected on the transparent substrate, a defining section defining an incident angle of each reflected light with respect to each light receiver, and a detection section detecting rainfall amount based on signals output from the light receivers. The light emitter emits the irradiation lights toward an irradiation region defined on the transparent substrate. The irradiation region is divided into multiple detection regions. The detection regions correspond to respective light receivers. The defining section defines the incident angle of each reflected light reflected on the detection region such that each reflected light enters corresponding light receiver. The detection section detects the rainfall amount based on the signals output from the light receivers corresponding to the irradiation regions.