Comparison of implementations of driving electronics for ultrasonic oscillating sensors

Abstract

An oscillating ultrasonic sensor can be built using a pair of ultrasonic transducers and an amplifier but this configuration is insufficient for getting consistent output readings within a single frequency interval. Inclusion of a band pass filter and phase shifter enables frequency interval limiting and setting the desired frequency at the sensor's calibration point. These circuits are implemented using various construction techniques and components and are discussed in the paper along with two relevant block diagrams, one being convenient for research purposes and the other for production. Experimental results obtained for temperature and tilt sensors are presented.

Accurate heat loss evaluation of water-cooled electric motors using a differential ultrasonic calorimeter

“…Additionally, submerged operation of ultrasonic transducers is usually subjected to external electromagnetic interference and noise [7]. The BPF specification should be chosen carefully, as the consistency of the results is very sensitive to the BPF bandwidth.…”

“…Most of the modules in the developed system were designed around programmable system-on-chip (PSoC) microcontrollers and had an ability to be programmed in circuit [7]. An example of an assembled modular system, shown in Fig.…”

“…3. An example of assembled modular system that features (a, c) signal multiplexers, (b) ultrasonic driver and (d) frequency meter [7].…”

Embedded Supervisory Control and Output Reporting for the Oscillating Ultrasonic Temperature Sensors

“…As the operating frequency was well below the specified lowest operating frequency for the LT1568 parts, the variable BPF was built using two operating amplifiers and three digital potentiometers using the fliege BPF configuration [6,13].…”

“…The phase shifter that was previously developed utilised four digital potentiometers that set the required weights [13]. In the latest design, presented in Fig.…”