FREQUENCY TRANSDUCER UTILIZING PULSE GENERATOR PRODUCING FREQUENCY-RESPONSIVE,VARIABLE-WIDTH OUTPUT PULSESCLARENCE W. HEWLETT JR.
The central frequency of each pulse is equal to 1; (top row) α = 0.5, and (bottom row) α = 1. Sign in to download full-size image Figure 4.5. The required frequency bandwidth for Berlage pulses with α = 1 given as the multiplicity of the central frequency fc for ...
To be efficient, the piezoelectric transducer must be able to generate and receive acoustic pulses with a high sensitivity in the range of 1–10 MHz. The high sensitivity of the transducer is closely related to the electromechanical coupling coefficient [106]. Piezoelectric transducers are part ...
3b). After sweeping from 1 to 20 cycles, we found that a 5-cycle pulse could provide the maximum pressure output in the experiment, which is consistent with the EQC results. Therefore, the following examination entailed the use of 5 cycles of pulses for actuation. To characterize the pulse...
To characterize the mechanical vibrations within a single element, we used the EQC model to calculate the peak velocities at a 3-MHz resonance frequency of all cells within one element (Fig.4a–c), considering the mutual acoustic coupling effects. The EQC model-derived results were compared with...
When the battery is turned ON the oscillator produces high-frequency alternating voltage pulses with a frequency f=1÷(2π√L1C1). Due to this, an e.m.f is induced in L3 which is transferred to the quartz crystal through plates A and B. Due to converse piezoelectric effect the crystal ...
Ultrasonic contact transducers have features that make it both similar and different to other types of transducers. Some of these features include its frequency range, which, like most ultrasonic transducers, fall within the range of 1 – 10 MHz even though there are special transducers that can...
whose resonant frequency is related to the PA pressure. The sensor is electromagnetically coupled via the inductor component, eliminating the need for abatteryin the transducer. Pressure data is wirelessly transmitted back to a receiver unit, which can be uploaded by the user into a database [93...
A digital system for converting the repetition rate (frequency) of an input signal into a proportional analog output signal, either in a single-ended or in a differential mode, is described. Basically
In the more advanced multichannel cochlear implant, a signal processor converts speech signals transduced by the microphone into a series of sequential electrical pulses corresponding to different frequency bands within a speech frequency spectrum. Electrical pulses corresponding to low frequency sounds are...