By R. W. Leonard, A. Barone, Rohn Truell, Charles Elbaum, B. E. Noltingk (auth.)
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Extra info for Akustik II / Acoustics II
67. The resistivity of ADP (a=onium dihydrogen sure is applied to a single surface, and the phosphate) as a function of temperature. ) other surface must be shielded from the pressure field. The bimorph microphone in Fig. 68 is made of two X-cut quartz slabs cemented together and supported by knife edges. The pressure seal was obtained with a nondrying lacquer. 5 mm thick. The resonant frequency of the cemented pair was 19 kc. The sensitivity at frequencies well ~ rJ I ~ /J [J - ~ + t - 0 1 W. FURRER and H.
14, 85-96 (1935). 42 R. W. LEO~ARD: Generation and Measurement of Sound in Gases. Sect. 18. The minimal value of WI C R is unity if 11 is chosen as the frequency of the lower half power point where the sensitivity is down 3db. Examination of the behavior of Eq. 15) shows that for each doubling of R (w1C=const) reduces the total noise voltage ET by about 3db. This reduction in noise requires that the lower band limit be determined at some other point in the chain of amplification where noise generation is unimportant.
W. LEONARD: Generation and Measurement of Sound in Gases. Sect. 19. is the greater noise output of the cathode-follower circuit which may be of the order of 20 db noisier than indicated by a calculation based on the input resistance of the cathode-follower. ---D+350V results from the fact that the cathodefollower voltage feedback is ineffective in reducing the noise generated by the resistance between cathode and grid. Thus, while the voltage gain of the follower is unity as far as the signal generated by the microphone is concerned, it may be much greater than unity for the noise generated in the grid to cathode leakage resistance.
Akustik II / Acoustics II by R. W. Leonard, A. Barone, Rohn Truell, Charles Elbaum, B. E. Noltingk (auth.)