Object detection device

An object detection device comprising:

• a transceiver configured to transmit/receive an ultrasonic wave;
• a drive signal generation unit configured to generate a drive signal for driving the transceiver;
• a transmitter circuit configured to cause the transceiver to transmit a probe wave, which is an ultrasonic wave, by driving the transceiver based on the drive signal;
• and
• a receiver circuit configured to generate a reception signal corresponding to a reception result of the ultrasonic wave of the transceiver, wherein
• the drive signal generation unit is configured to generate the drive signal so that frequency of the probe wave changes over time,
• the object detection device further comprising:
• a voltage measurement unit configured to measure a voltage signal generated in the transceiver while the transceiver transmits the probe wave with frequency changing over time;
• and
• a state determination unit configured to make a state determination regarding the transceiver based on the voltage signal, wherein
• the state determination unit is configured to make the state determination based on an amplitude signal extracted from the voltage signal,
• the state determination unit is configured to determine a state of at least one of the transceiver, the transmitter circuit, and the receiver circuit based on information related to a local minimum point of the amplitude signal, and
• the state determination unit is further configured to determine the state of at least one of the transceiver, the transmitter circuit, and the receiver circuit, based on either or both of a comparison between a frequency of the probe wave corresponding to the local minimum point and a reference frequency, and a comparison between a magnitude of the amplitude signal at the local minimum point and a reference amplitude.