Abstract: A detection device includes: a generator that generates a plurality of waves; a plurality of transmitters that emit the plurality of waves, the plurality of waves each being emitted by a corresponding one of the plurality of transmitters; a plurality of receivers each of which receives one or more of the plurality of waves as a composite wave; a deriver that derives individual data for each combination of one of the plurality of transmitters and one of the plurality of receivers by deriving, from received data of each of the plurality of receivers, the individual data corresponding to each of the plurality of transmitters; and a detector that detects an object that affects at least one of the plurality of waves, according to the individual data.

Abstract: An imaging device includes: a plurality of transmitters that each transmit a wave to a measurement area; a plurality of receivers that each receive a scattered wave of the wave from the measurement area; and an information processing circuit that images an object in the measurement area using measurement data of the scattered wave. The information processing circuit: derives a scattering field function using the measurement data and a velocity vector of the object; derives an imaging function that is defined using an amount output from the scattering field function in response to inputting an imaging target position into the scattering field function; and images the object in the measurement area using the imaging function. The information processing circuit derives the scattering field function from the measurement data using a coordinate system in which the position of the object is fixed.

Abstract: An imaging device includes a transmitter row of transmitters that are aligned in a straight line and transmit a wave to a region, a receiver row of receivers provided at an interval from the transmitter row and alighted in a straight line parallel to the line of transmitters, and receiving the wave from the region, and an information processing circuit that derives an imaging function based on measurement data and a distance and using the imaging function to image the structure of a scatterer included in an object present in the region, the imaging function corresponding to a scattering field function relating to scattering of the wave, the measurement data being obtained by all or some combinations of the transmitters and the receivers, the distance being a distance between the straight line along which the transmitters are aligned and the different straight line along which the receivers are aligned.

Abstract: An imaging device includes: a plurality of transmitters which are disposed on both sides of a region and transmit waves to the region; a plurality of receivers which are disposed on the both sides and receive the waves from the region; and an information processing circuit which derives an imaging function corresponding to a scattering field function related to scattering of the wave according to a correspondence between (i) measurement data obtained by the plurality of transmitters and the plurality of receivers and (ii) a composition of a plurality of functions related to multiple first-order scattering forming multiple scattering, and visualizes a three-dimensional structure of a scatterer included in an object in the region, using the imaging function.

Abstract: A resonance circuit including a high frequency induction heating coil is set to a resonance state and a heating temperature of an object to be heated (for example, catalytic converter or the like) is controlled on the basis of a resonance frequency varied with an increased temperature of the object under the resonance state.