Electronic apparatus for biological research Electronic apparatus for biological research electronicappara00dona Year: 1958 DYNAMIC MECHANOELECTRICAL TRANSDUCERS change of magnetic field, and therefore with all common configurations to the velocity of the mechanical input. If a sinusoidal mechanical input is applied to such a transducer, the result- ing peak velocity will be proportional both to the amplitude of the displace- ment and to its frequency. Thus for a constant amplitude input to an electrodynamic transducer, the voltage output will be proportional to fre- quency; this characterist
Electronic apparatus for biological research Electronic apparatus for biological research electronicappara00dona Year: 1958 DYNAMIC MECHANOELECTRICAL TRANSDUCERS change of magnetic field, and therefore with all common configurations to the velocity of the mechanical input. If a sinusoidal mechanical input is applied to such a transducer, the result- ing peak velocity will be proportional both to the amplitude of the displace- ment and to its frequency. Thus for a constant amplitude input to an electrodynamic transducer, the voltage output will be proportional to fre- quency; this characteristic is shown in Figure Comparison with Frequency Figure Response of electrodynamic transducer for constant input displacement Graph 9 shows that there is an essential difference between electrodynamic and piezo-electric transducers, although both give no output at zero frequency. Electrodynamic transducers can be constructed with very low mechanical impedance, suitable for use for measuring displacement. However, the rising frequency characteristic implies that the electrical output will not give a true picture of the displacement. Although this frequency characteristic may be linearized by passing the output through an integrating circuit (Chapter 3), it is usually possible to choose a more satisfactory type of transducer for the purpose. However, if information about the velocity of a system is required, the output of an electrodynamic transducer, suitably amplified, can be used to record this quantity directly. This avoids subsequent graphical differentiation of a displacement record and is the most useful application of this type of transducer. For qualitative work when, for example, only the frequency of a vibration or the time of occurrence of a transient mechanical disturbance is required, the simplicity and high sensitivity of certain types of electrodynamic trans- ducer are valuable. Thus, if an insect is attached to the armature of a moving- iron transd
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