Electronic apparatus for biological research Electronic apparatus for biological research electronicappara00dona Year: 1958 TRANSDUCERS Capacitance transducers have many properties in common with inductance transducers; thus they may easily be constructed so as to have a mechanical impedance suitable for any particular purpose. In addition, they too are fundamentally non-linear and must therefore be operated over a restricted / Fixed and moving condenser plates Moving plate \ Insulator / Fixed plates Tension /w/ire Flexible /diaphragm Insulator Fixed plate (a) (b) (c) Figure Variable
Electronic apparatus for biological research Electronic apparatus for biological research electronicappara00dona Year: 1958 TRANSDUCERS Capacitance transducers have many properties in common with inductance transducers; thus they may easily be constructed so as to have a mechanical impedance suitable for any particular purpose. In addition, they too are fundamentally non-linear and must therefore be operated over a restricted / Fixed and moving condenser plates Moving plate \ Insulator / Fixed plates Tension /w/ire Flexible /diaphragm Insulator Fixed plate (a) (b) (c) Figure Variable capacitance transducers range if linearity is desired. Transducers of this type are potentially extremely sensitive; with close electrode spacing (and, of course, correspondingly good workmanship) movements of 0-01 fj, may easily be detected. When the moving electrode is controlled by a stiff spring to give a high mechanical impedance such a transducer can be used to measure force with very little deflection and a high resonant frequency. Miscellaneous static transducers In this section two transducers will be described which while basically of the variable resistance type achieve this variation in such an unusual way that they are best classified as miscellaneous. The mechanoelectronic transducer (RCA Type 5734) is illustrated in Figure The anode of a very small triode valve is flexibly mounted on a metal diaphragm and is continued outside as an operating shaft. Sideways deflection of this shaft varies the anode-cathode spacing, and hence the anode current of the valve. 'With the mechanical input applied to the end of the 3 mm long operating shaft, the compliance of the transducer is 10~' cm per dyne (I fi per g wt). This gives a very high mechanical input impedance well suited to the measure- ment of force. The resonant frequency of the transducer alone is 12 kc/s, although this is inevitably reduced by any mass attached to the operating shaft. The circuit used is sho
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