Center frequency(KHz) | 40.0±1.0 |
Transmitting Sound Pressure Level(dB) (30cm /10Vrms Sine Wave) | ≥96 |
Receive Sensitive(dB) dB/v/μbar (0dB＝V/Pa) | ≥-82 |
-6 dB Directivity (deg)（º） | 75±10 |
Ringing（ms） | ≤1.36 |
Function | Transmitter / Receive |
capacitance (pF)（25℃） | 1800±10% |
Allowable Input Voltage(Vp-p) (40KHz) | 150 |
Operating Temperature (℃) | -40~+80 |
Storage Temperature (℃) | -40~+85 |
Terminal | PIN |
Weight(g) | 3.3 |
When a 40 kHz high-frequency voltage is applied to a piezoelectric ceramic sheet (dual crystal oscillator) having a resonance frequency of 40 kHz in the sensor, the piezoelectric ceramic sheet is elongated and shortened in accordance with the polarity of the applied high-frequency voltage, so that an ultrasonic wave of 40 kHz , Its ultrasonic spread in the form of density (density control by the modulation circuit), and passed to the wave receiver.
The receiver utilizes the piezoelectric principle of the pressure sensor by applying pressure on the piezoelectric element to strain the piezoelectric element to produce a sine wave of 40 kHz that is "+" on one side and "-" on the other side Voltage. Due to the high frequency voltage amplitude is small, it must be amplified. The ultrasonic sensor allows the driver to safely reverse the vehicle by using any obstacle detected on or near the reversing path and issuing a timely warning. The designed detection system can provide both audible and visual audible and visual warnings. The warning indicates that the distance and direction of obstacles in the blind zone are detected. In this way, in a narrow place, whether parking or driving, with the reversing obstacle alarm detection system, the driver will reduce the psychological pressure, and can take the necessary action.
By the sending sensor (or wave transmitter), the receiving sensor (or wave receiver), the control part and the power supply part. Transmitter sensor and the use of a diameter of about 15mm ceramic oscillator transducer composition, the role of the transducer is to vibrate the electrical vibration energy of the ceramic oscillator into super energy and radiation to the air; and receive the sensor from the ceramic oscillator transducer And the amplifier circuit, the transducer receives the wave to produce mechanical vibration, it is converted into electrical energy, as the output of the sensor receiver, so as to send the ultra-detection.And in actual use, with the sensor to send the ceramic oscillator can Used as a sensor of the receiver ceramic resonators. The control part mainly controls the pulse train frequency, duty cycle, sparse modulation, counting and detection distance sent by the transmitter. Ultrasonic sensor power (or signal source) available DC12V ± 10% or 24V ± 10%.
