The electrical output from the photomultiplier tube is used as constant feedback to the piezoelectric transducer to adjust the height of the tip according to variations in surface topography.
32.
In 1938, Willia Spencer of Electrical & Musical Industries ( later EMI ) applied for a patent on an acoustical delay line using piezoelectric transducers and a liquid medium.
33.
During World War II, Cady again worked on military applications of piezoelectricity, including trainers for radar operators that used piezoelectric transducers in liquid tanks to generate realistic radar returns.
34.
The basic design of a photoelastic modulator consists of a piezoelectric transducer and a half wave resonant bar; the bar being a transparent material ( now most commonly fused silica ).
35.
Originally natural materials were used for the transducers, but by the 1930s sonar systems incorporating piezoelectric transducers made from synthetic materials were being used for passive listening systems and for active echo-ranging systems.
36.
In earlier columns Daedalus proposed attaching sensitive piezoelectric transducers, accelerometers and other instruments to dying people to detect the departure of their souls and to measure the soul's mass, velocity and quantum-mechanical spin.
37.
Thus the decay constant is found empirically and is used to interpret the signal obtained during the lateral scan and to set a feedback point for the piezoelectric transducer during constant signal scanning.
38.
The sensitivity of these devices continues to improve; a newly developed piezoelectric transducer can produce frequencies in the MHz that can easily propagate through even high acoustic impedance materials such as steel and dense ceramics.
39.
Also, since both piezoelectric transducers and microphones are more prone to unwanted feedback than magnetic pickups, the bass tech may have to set up a notch filter with a parametric equalizer to reduce the frequency that is feeding back.
40.
But that speaker is invariably the cheapest that it's possible to get ( it's often just a piezoelectric transducer, someones soldered directly to the motherboard ); so the sound quality was so bad it generally made Edith Piaf sound like a bad-tempered Dalek.
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