G - Physics – 01 – F
Patent
G - Physics
01
F
325/1, 73/69
G01F 23/26 (2006.01) G01D 5/12 (2006.01) G01D 5/24 (2006.01)
Patent
CA 2011509
ABSTRACT OF THE DISCLOSURE An optically powered sensor arrangement comprises a plurality of sensors which are interconnected to an optical bus to communicate with a central controller. Each of the sensors receives optical energy from the bus and uses a photo-diode array to convert the received optical energy into electrical energy which is stored in a capacitor. Each sensor includes a transducer in the form of a capacitance device, such as one in which the capacitance varies with liquid level. In addition, a fixed reference capacitance is provided. Under the action of a timing and sequence control, and as energised by the stored electrical energy in the capacitor, a pulse encoder produces, in sequence, two integrated outputs, one dependent on the capacitance value of the transducer and the other dependent on the capacitance value of the reference capacitor. The integrated outputs are compared with predetermined fixed levels so as to produce a series of short-duration pulses from whose time separation the capacitance value of the transducer can be derived, and thus the liquid level. These pulses drive a light emitting diode to produce corresponding optical pulses which are transmitted to the central control.
Andresen Richard P.
Spillman William B. Jr.
Andresen Richard P.
Bereskin & Parr
Simmonds Precision Products Inc.
Spillman William B. Jr.
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