| 摘要 |
An ultrasound sensor includes a transmitting/receiving device configured to transmit/receive ultrasound waves; and a controller configured to make the transmitting/receiving device transmit an ultrasound burst wave, as each of the ultrasound waves, and detect an object through a reception signal that is output from the transmitting/receiving device. The controller is configured to shift operation mode to a detecting mode, when the object is detected in a monitoring mode. In the monitoring mode, the number of waves included in the ultrasound burst wave is changed in two stages. The detecting mode is of detecting the object, using the ultrasound burst wave having the waves that are being used at a time point when the object is detected in the monitoring mode. |
| 主权项 |
1. An ultrasound sensor, comprising:
a transmitting/receiving device configured to transmit/receive ultrasound waves; and a controller configured to provide a transmission signal to the transmitting/receiving device to make the transmitting/receiving device transmit an ultrasound burst wave, as each of the ultrasound waves, the controller being configured to detect an object in a detection area to which the ultrasound waves are transmitted, through a reception signal that is output from the transmitting/receiving device, wherein the transmitting/receiving device is configured to more increase amplitude of the reception signal, as a number of waves included in the received ultrasound burst wave is larger in a range where the amplitude of the reception signal is not saturated, and wherein the controller is configured to define, as a pulse number, the number of waves included in the ultrasound burst wave, the controller being configured to determine that the object is present, when a reception signal level is equal to or more than a threshold, the reception signal level being equivalent to the amplitude of the reception signal that corresponds to waves reflected by the object, the controller being configured to cyclically select the pulse number to be used from a plurality of pulse numbers that are set in stages, and detect the object with the pulse number being used when having determined that the object is present. |
