Detection device and detection system
A detection device includes a first sensor configured to transmit a first electromagnetic wave to a first range and receive the first electromagnetic wave reflected in the first range, a second sensor configured to transmit a second electromagnetic wave to a second range different from the first range and receive the second electromagnetic wave reflected in the second range, and a processor configured to calculate information on an object reflecting the first electromagnetic wave and the second electromagnetic wave based on a first signal output from the first sensor and a second signal output from the second sensor.
1 . A detection device comprising:
a first sensor including a first transmitting antenna and a first receiving antenna, the first transmitting antenna transmitting a first electromagnetic wave to an object and the first receiving antenna receiving the first electromagnetic wave reflected by the object, the first sensor outputting a first signal corresponding to a difference between the first electromagnetic wave transmitted from the first transmitting antenna and the first electromagnetic wave received by the first receiving antenna;
a second sensor including a second transmitting antenna and a second receiving antenna, the second transmitting antenna transmitting a second electromagnetic wave to the object and the second receiving antenna receiving the second electromagnetic wave reflected by the object, the second sensor outputting a second signal corresponding to a difference between the second electromagnetic wave transmitted from the second transmitting antenna and the second electromagnetic wave received by the second receiving antenna;
a base body having a front side and a back side, on which the first sensor and the second sensor are mounted on the front side;
an accelerometer that detects vibration of the base body, and outputs a third signal corresponding to detected vibration; and
a processor that extracts a first difference between the first signal output from the first sensor and the second signal output from the second sensor, and a second difference between the second signal output from the second sensor and the third signal output from the accelerometer, and outputs the first difference and the second difference as information on the object reflecting the first electromagnetic wave and the second electromagnetic wave,
wherein the first sensor is arranged on the front side of the base body so that the first electromagnetic wave is directed to a first range of the object, and the second sensor is arranged on the front side of the base body so that the second electromagnetic wave is directed to a second range different from the first range of the object, and
wherein when the object is a living body, the processor generates heartbeat information of the living body based on the first difference and generates respiration information of the living body based on the second difference.
2 . The detection device according to claim 1 , wherein
the processor extracts the first difference based on a fourth signal obtained by performing Fourier transformation on the first signal, and a fifth signal obtained by performing Fourier transformation on the second signal.
3 . The detection device according to claim 2 , wherein
the processor compares a frequency spectrum of the fourth signal and a frequency spectrum of the fifth signal, and extracts the first difference based on a comparison result.
4 . A detection system including a detection device mounted on a vehicle and detecting information on a living body in the vehicle, the detection device comprising:
a first sensor including a first transmitting antenna and a first receiving antenna, the first transmitting antenna transmitting a first electromagnetic wave to the living body and the first receiving antenna receiving the first electromagnetic wave reflected by the living body, the first sensor outputting a first signal corresponding to a difference between the first electromagnetic wave transmitted from the first transmitting antenna and the first electromagnetic wave received by the first receiving antenna;
a second sensor including a second transmitting antenna and a second receiving antenna, the second transmitting antenna transmitting a second electromagnetic wave to the living body and the second receiving antenna receiving the second electromagnetic wave reflected by the living body, the second sensor outputting a second signal corresponding to a difference between the second electromagnetic wave transmitted from the second transmitting antenna and the second electromagnetic wave received by the second receiving antenna;
a base body having a front side and a back side, on which the first sensor and the second sensor are mounted on the front side;
an accelerometer that detects vibration of the base body, and outputs a third signal corresponding to detected vibration, and
a processor that extracts a first difference between the first signal output from the first sensor and the second signal output from the second sensor, and a second difference between the second signal output from the second sensor and the third signal output from the accelerometer,
wherein the first sensor is arranged on the front side of the base body so that the first electromagnetic wave is directed to a first range of the living body, and the second sensor is arranged on the front side of the base body so that the second electromagnetic wave is directed to a second range different from the first range of the living body, and the first range is closer to a heart of the living body than the second range, and
wherein the processor generates heartbeat information of the living body based on the first difference and generates respiration information of the living body based on the second difference.
5 . A detection device comprising:
a first sensor including a first transmitting antenna and a first receiving antenna, the first transmitting antenna transmitting a first electromagnetic wave to an object and the first receiving antenna receiving the first electromagnetic wave reflected by the object, the first sensor outputting a first signal corresponding to a difference between the first electromagnetic wave transmitted from the first transmitting antenna and the first electromagnetic wave received by the first receiving antenna;
a second sensor including a second transmitting antenna and a second receiving antenna, the second transmitting antenna transmitting a second electromagnetic wave to the object and the second receiving antenna receiving the second electromagnetic wave reflected by the object, the second sensor outputting a second signal corresponding to a difference between the second electromagnetic wave transmitted from the second transmitting antenna and the second electromagnetic wave received by the second receiving antenna; and
a processor that extracts a difference between the first signal output from the first sensor and the second signal output from the second sensor, and outputs the difference as information on the object reflecting the first electromagnetic wave and the second electromagnetic wave,
wherein the first sensor is arranged on the front side of the base body so that the first electromagnetic wave is directed to a first range of the object, and the second sensor is arranged on the front side of the base body so that the second electromagnetic wave is directed to a second range different from the first range of the object, and
wherein when the object is a living body, the processor generates heartbeat information of the living body based on the difference.