Custom Dual-Transducer Ultrasonic Level Sensor

Challenge: Standard ultrasonic sensors have a ~50mm blind zone from ringdown after the transmit pulse. This client's medical dispenser needed reliable detection down to 10mm. Solution: Separate TX and RX transducers eliminate the shared-element ringdown problem, paired with custom envelope detection firmware. Acoustic crosstalk at close range is managed with a staggered pulse timing scheme. Results: Reliable detection at 10mm, which let the client shrink their reservoir housing and still detect a full reservoir accurately.