Abstract: According to one embodiment, a filter includes a first layer and a second layer. The first layer includes a first resin provided with a plurality of holes. The first layer includes a first face. At least a part of the plurality of holes reaches the first face. The second layer includes a second resin. The second resin blocks at least a part of the plurality of holes reaching the first face.

Abstract: According to one embodiment, a data processing device includes an acquisitor and a processor. The acquisitor can acquire a first concentration signal obtained from a first concentration sensor configured to detect a first concentration of a first target substance included in a first output gas and a first flow rate signal obtained from a first flow rate sensor configured to detect a first flow rate of the first output gas. The processor can derive a first concentration value corresponding to the first concentration based on the first concentration signal. The processor can derive a first corrected conversion coefficient obtained by correcting a first conversion coefficient regarding a relationship between the first flow rate signal and the first flow rate based on the first concentration value. The processor can derive a first flow rate value corresponding to the first flow rate based on the first flow rate signal.

Abstract: According to one embodiment, a sensor includes a detection device and a circuit portion. The detection device includes a first detection portion and a second detection portion. The first detection portion includes a first detection element. The first detection element includes a first conductive member and a first detection member. The second detection portion includes a second detection element. The second detection element includes a second conductive member and a second detection member. The circuit portion is configured to execute a first detection portion operation for outputting a first detection result corresponding to a first detection value based on the first detection member when a first current is supplied to the first conductive member. In a case where a first evaluation value is not within a first range, the circuit portion is configured to execute a second detection portion operation by the second detection portion.

Abstract: According to one embodiment, a sensor includes a base, first to third detection parts. The base includes first to third base regions. The first detection part includes a first detection element. A first gap is provided between the first base region and the first detection element. The second detection part includes a second detection element. A second gap is provided between the second base region and the second detection element. The third detection part includes a third detection element. The third detection element includes a third resistance member, a third other resistance member, and a third conductive member. The third conductive member is between the third resistance member and the third other resistance member. A third gap is provided between the third base region and the third detection element.

Abstract: According to one embodiment, a sensor includes a detection device, a switch circuit, and a detection circuit. The detection device includes a first detection section and a second detection section. The first detection section includes a first detection element. The first detection element includes a first conductive member and a first resistance member. The second detection section includes a second detection element. The second detection element includes a second conductive member and a second resistance member. In a first operation, the switch circuit is configured to supply a first current to the first conductive member and not to supply the first current to the second conductive member, and the detection circuit is configured to output a first signal corresponding to a difference between a first electrical resistance of the first resistance member and a second electrical resistance of the second resistance member.

Abstract: According to one embodiment, a sensor includes a sensor part including a first film, and a structure body including a second film. The first film has a first density, and a first concentration of a first element. The second film has at least one of a second density, or a second concentration of the first element. The second concentration is greater than the first concentration. The second density is greater than the first density.

Abstract: According to one embodiment, a sensor system includes a pipe and a sensor. The sensor is configured to detect a detection target substance in the pipe. The sensor includes a base, a first detection part, and a second detection part. The base includes a first base region and a second base region. The first detection part includes a first support part, a first connection part, and a first detection element. The second detection art includes a second support part, a second connection part, and a second detection element.

Abstract: A sensor includes a handhole part and a sensor module. The handhole part includes an inner wall and a holder. The holder is located at the inner wall. The sensor module is provided in the handhole part. The sensor module includes a held part held by the holder, a housing connected with the held part, a sensor circuit provided in the housing and including a gas sensor element, and a battery configured to supply electrical power to the sensor circuit. A gap is between the inner wall and the housing and between the housing and a first member under the housing.

Abstract: According to one embodiment, a sensor includes a housing and a sensor portion. The housing includes a first housing member. The first housing member includes an opening. The sensor portion is provided in the housing. The sensor portion includes a sensor member including a hole, and a sensor element. A first space between the sensor element and the sensor member is connected to a second space that is another space in the housing. A detection target gas is configured to flow into the first space through the opening and the hole.

Abstract: According to one embodiment, a sensor includes a housing, a sensor portion, and a film member. The housing includes a first housing member including an opening. The first housing member includes a first inner face, and a first side face inside the opening. The sensor portion includes a sensor member including a hole, and a sensor element. A first gap is provided between the sensor element and the sensor member. The film member is porous. The film member includes an inner region and an outer region around the inner region. The outer region faces the first inner face. The sensor member is located between the sensor element and the inner region. The sensor member faces the inner region. At least a part of the inner region overlaps the first side face in a second direction crossing a first direction from the sensor element to the sensor member.

Abstract: According to one embodiment, a MEMS element includes a first member, and an element part. The element part includes a first fixed electrode fixed to the first member, and a first movable electrode facing the first fixed electrode, a first conductive member electrically connected with the first movable electrode, and a second conductive member electrically connected with the first movable electrode. The first movable electrode is supported by the first and second conductive members to be separated from the first fixed electrode in a first state before a first electrical signal is applied between the second conductive member and the first fixed electrode. The first conductive member is separated from the first movable electrode in a second state after the first electrical signal is applied. The first movable electrode is supported by the second conductive member to be separated from the first fixed electrode in the second state.

Abstract: Provided are an oil receiver (20) having an annular recess portion (52) which faces an entire circumference of an outer circumferential edge of a concave spherical portion (36), and a guide member (21) which guides lubricating oil, which has flowed out from a spherical engagement portion between a convex spherical portion (24) and a concave spherical portion (36), toward an annular recess portion (52).

Abstract: According to one embodiment, a sensor includes a base, and a first structure body. The base includes semiconductor dement including the first dement electrode. The first structure body includes a first conductive member and a coil. The first conductive member is electrically connected with the first element electrode. The coil is provided around the first conductive member in a first plane crossing a first direction from the base to the first structure body.

Abstract: According to one embodiment, a sensor includes an element part. The element part includes a base body, a first detection support part fixed to the base body, a first detection connection part including a first connection resistance layer and supported by the first detection support part, a first support part fixed to the base body, a first structure body, a first connection part, and a film part. The first structure body includes a first end part and a first other end part. The first end part is supported by the first support part. The first connection part is supported by the first other end part. The film part includes a first detection part and a first part. The first detection part is supported by the first detection connection part. The first part is supported by the first connection part. The film part includes a film part resistance layer.

Abstract: According to one embodiment, a sensor includes a first element including a first resistance member and a first conductive member, a second element including a second resistance member, and a third resistance member connected in series with the second resistance member. An absolute value of a third temperature coefficient of a third resistance of the third resistance member is smaller than an absolute value of a first temperature coefficient of a first resistance of the first resistance member. The absolute value of the third temperature coefficient is smaller than an absolute value of a second temperature coefficient of the second resistance member. The third resistance is lower than the second resistance.

Abstract: According to one embodiment, an electrochemical device includes an electrochemical element, and a controller. The electrochemical element includes a first electrode, a second electrode, and a first member provided between the first electrode and the second electrode. The controller is electrically connected to the first electrode and the second electrode. The controller is configured to supply a first signal between the first electrode and the second electrode. The first signal includes a waveform repeating in a first period. The waveform includes a first duration of a first voltage of a first polarity, and a second duration of a second voltage of the first polarity. An absolute value of the second voltage is smaller than an absolute value of the first voltage.

Abstract: According to one embodiment, a sensor includes a handhole part, a sensor module, and a holder. The handhole part includes an inner wall. The sensor module is provided in the handhole part. The sensor module includes a housing, a sensor circuit provided in the housing, the sensor circuit including a gas sensor element, and a battery configured to supply electrical power to the sensor circuit. The holder holds the sensor module so that a gap is formed between the inner wall and the housing and between the housing and a first member under the housing.

Abstract: According to one embodiment, a sensor includes a base including a first face, and a first structure body fixed to the first face. The first structure body includes first and second support portions, a first movable portion, and a first fixed electrode. The first support portion is fixed to the first surface. The second support portion is fixed to the first face and provided around the first support portion. The first movable portion is supported by the first and second support portions and apart from the base. The first fixed electrode is fixed to the first face. The first movable portion includes a first movable electrode and a first conductive member. A first current is configured to flow the first conductive member. The first fixed electrode faces the first movable electrode. A first gap is provided between the first fixed electrode and the first movable portion.

Abstract: According to one embodiment, a hydrogen sensor is disclosed. The hydrogen sensor includes a capacitor, a gas detector, a heater, and a determiner. The capacitor includes a deformable member that deforms by absorbing or adsorbing hydrogen and varies a capacitance value corresponding to a deformation of the deformable member. The gas detector detects gas based on a capacitance value of the capacitor. The heater heats the deformable member. The determiner determines whether gas detected by the gas detector contains a substance other than hydrogen or not, wherein the gas detector detects the gas during a heating period during which the heater heats the deformable member.

Abstract: According to one embodiment, a sensor includes a detector. The detector includes a first resistance member, a second resistance member, a third resistance member, and a conductive member. A position of the third resistance member in a first direction from the first resistance member to the second resistance member is between a position of the first resistance member in the first direction and a position of the second resistance member in the first direction. A second direction from the conductive member to the third resistance member crosses the first direction. A third electrical resistance of the third resistance member is configured to change depending on a target substance around the detector.