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Unformatted text preview: on is divided by L, the result for unattenuated oscillation is:
d2q/dt2 + q/LC = 0
The result for the resonant frequency of the resonant circuit without attenuation is:
ω2 = 1/LC Example For example, if one assumes
L = 100 µH, and C = 10 nF,
then the resonant frequency is
ω = 1/ (100 · 10-6 · 10 · 10-9 )1/2 = 1 · 106 Hz = 1 MHz 158 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals 6 Basic circuit of an inductive
proximity sensor Oscillator (1) Switching status display (4) Internal constant voltage supply (7) Demodulator (2) Output stage with protective circuit (5) Active zone (coil) (8) Triggering stage (3) External voltage (6) Switch output (9) Fig. 11.1.3: Block circuit diagram of an inductive proximity sensor V V
t V t V
t t Fig. 11.1.4: Oscillator amplitude and switching threshold of the triggering stage A demodulator is connected to the oscillator for evaluating changes in amplitude.
This is where the output signal for the actuation of the triggering stage is created. In
the triggering stage, the analogue signal is converted into a digital signal. The
triggering stage does not sup...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.
- Spring '12