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China 40KHz Ultrasonic Sensor - High Sensitivity, Compact Design from Reliable Suppliers and Factory
Features
A. Characteristic
- Open structure and separate use
- Compact and light weight
- High sensitivity and sound pressure
- Less power consumption
- High reliability
B. Technical Terms
| No. | Item | Unit | Specification |
|---|---|---|---|
| 1 | Construction | — | Open |
| 2 | Using Method | — | Transmitter / Receiver |
| 3 | Nominal Frequency | Hz | 40K |
| 4 | Sensitivity | — | ≥ -68V/u Mbar |
| 5 | S P L | dB | ≥ 115 (10V / 30cm / sine wave) |
| 6 | Directivity | — | 60 deg |
| 7 | Capacitance | pF | 2500 ± 20% @ 1KHz |
| 8 | Allowable Input Voltage | Vp-p | 150 (40KHz) |
| 9 | Detectable Range | m | 10 |
| 10 | Operating Temperature | ℃ | -40 … +85 |
C. Drawing (Mark: T = Transmitter, R = Receiver)
Dimensional drawing — T: Transmitter | R: Receiver
Introduction to Ultrasonic Sensors
Ultrasonic sensors are sensors developed using the characteristics of ultrasound. Ultrasonic sensors utilize the piezoelectric effect of piezoelectric ceramics. When an electric signal is applied to a piezoelectric ceramic plate, it will deform, causing the sensor to vibrate and emit ultrasonic waves. When ultrasound hits an obstacle, it reflects back and acts on the piezoelectric ceramic plate through the sensor. Based on the inverse piezoelectric effect, the ultrasound sensor generates an electrical signal output. By utilizing the principle of constant propagation speed of ultrasonic waves in the same medium, the distance between obstacles can be determined based on the time difference between transmitting and receiving signals. Ultrasonic waves will generate significant reflection echoes when they come into contact with impurities or interfaces, and Doppler effects when they come into contact with moving objects. Therefore, ultrasonic sensors are widely used in industries, civilian use, national defense, biomedicine, and other fields.
Applications
- Automotive anti-collision radar, ultrasonic ranging system, ultrasonic proximity switch.
- Remote control devices for household appliances, toys, and other electronic devices.
- Ultrasonic emission and reception devices for anti-theft and disaster prevention equipment.
- Used to drive away mosquitoes, insects, animals, etc.
Notices
- The ultrasonic emitter emits an ultrasonic beam at a 60 degree angle outward, so there should be no other obstacles between the probe and the measured object.
- The ultrasonic module measures the vertical distance between the measured object and the probe, and the probe should be kept facing the measured object during measurement.
- Ultrasonic measurement is influenced by environmental wind speed, temperature, etc.
Possible Issues
- Due to the influence of unevenness of the measured object, reflection angle, environmental wind speed and temperature, and multiple reflections, ultrasonic waves may increase measurement data errors.
- Due to the inherent characteristics of ultrasound in measuring blind spots, if the measurement position changes and the received data remains unchanged during close range measurement, it indicates that the measurement blind spot has been entered.
- If no measurement data is returned when the module is measuring distant objects, it may be outside the measurement range or the measurement angle may be incorrect. The measurement angle can be adjusted appropriately.
Frequently Asked Questions (FAQ)
Q
What is the operating frequency of this ultrasonic sensor?
The nominal operating frequency of this ultrasonic sensor is 40KHz. This frequency is optimized for reliable short-to-medium range distance detection in both indoor and outdoor environments.
Q
What is the maximum detectable range of the sensor?
The maximum detectable range is 10 meters. If no data is returned during measurement, the target may be out of range or the sensor angle may need to be adjusted.
Q
Can this sensor work in extreme temperature conditions?
Yes. The sensor is rated for an operating temperature range of -40°C to +85°C, making it suitable for use in harsh industrial and outdoor environments.
Q
What causes measurement errors in ultrasonic sensors?
Measurement errors can be caused by several factors including surface unevenness of the target object, reflection angle, environmental wind speed, temperature variations, and multiple signal reflections. Ensuring a clear, unobstructed path between sensor and target helps minimize errors.
Q
What is the beam angle of the ultrasonic emitter?
The ultrasonic emitter has a directivity of 60 degrees. It is important that no obstacles are present between the probe and the measured object within this beam angle to ensure accurate readings.
Q
What are the typical application areas for this ultrasonic sensor?
This sensor is widely used in automotive anti-collision radar, ultrasonic ranging systems, proximity switches, remote control devices for household appliances and toys, anti-theft and disaster prevention equipment, and pest repelling applications.