Showing papers on "Piezoelectric sensor published in 1978"
Patent•
25 Jul 1978
TL;DR: In this paper, a transducer comprising a piezoelectric measuring sensor element for measurement of mechanical values on hollow bodies, especially of the pressure distribution within pipes, was presented.
Abstract: A transducer comprising a piezoelectric measuring sensor element for measurement of mechanical values on hollow bodies, especially of the pressure distribution within pipes, the piezoelectric sensor element being a flexible piezoelectric film, the opposite surfaces of the film being in connection with electrically leading contact surfaces, and the measuring sensor element being at least partially and at least indirectly closely joinable to the surface of the hollow body.
39 citations
TL;DR: The usefulness of the piezoelectric polymer, polyvinylidene) fluoride, for sensors in coin operated devices is demonstrated in this article, where features such as high sensitivity, low cost, and ease of handling and processing make this material extremely attractive for these applications.
Abstract: The usefulness of the piezoelectric polymer, poly(vinylidene) fluoride, for sensors in coin operated devices is demonstrated. Features such as high sensitivity, low cost, and ease of handling and processing make this material extremely attractive for these applications.
13 citations
Patent•
20 Jan 1978
TL;DR: In this paper, a correlator is provided to judge the presence or not of any flaw of the position to be examined from the correlations of respective receiving acoustic waves by providing a correlation which judges the correlations from the propagation acoustic waves from a piezoelectric pulser.
Abstract: PURPOSE: To judge the presence or not of any flaw of the position to be examined from the correlations of respective receiving acoustic waves by providing a correlator which judges the correlations from the propagation acoustic waves from a piezoelectric pulser. CONSTITUTION: A piezoelectric pulser 2 is excited by the signal having amplified the output of an oscillator 5 with a power amplifier 6 and generates impulsive acoustic waves. The acoustic waves propagate in the member to be examined 1. Pizoelectric sensors 3, 4 are subsequently arrayed in the propagating direction of said acoustic waves and the acoustic waves are received respectively thereby. The receiving timings thereof vary with the time differences required for propagation of the acoustic wave in the member to be examined 1. And the signal having been received in the first piezoelectric sensor 3 is supplied to one terminal of a correlator 10. The signal having been received in the second piezoelectric sensor 4 is being inputted to the other terminal of the correlator 10. COPYRIGHT: (C)1979,JPO&Japio
6 citations
Patent•
24 Aug 1978
TL;DR: In this article, a keyboard is made to respond to the speed of increase in pressure of the player's fingers as well as the strength of pressure applied, and each key is coupled to a note generator stage based around a voltage controlled oscillator.
Abstract: The response of an electrical instrument is made more sensitive to approach the response to touch of a natural one. The keyboard is made to respond to the speed of increase in pressure of the player's fingers as well as the strength of pressure applied. Each key is coupled to a note generator stage based around a voltage controlled oscillator. The array of keys are also coupled via a common plate to sensors (G) that generate a voltage output proportional to the impact pressure. The plate (a) contacts the sensor (b), e.g. piezoelectric crystal, that is embedded in casting resin within a tube (d). The note generator is thus controlled to vary the attenuation and amplitude characteristic.
2 citations