Claims
- 1. A system for measuring an electromagnetic property of a member, comprising:
- transceiver means spaced from the member for directing electromagnetic energy at a region of the member and for receiving reflected electromagnetic from the region, the reflected electromagnetic energy being representative of the electromagnetic property, the transceiver means outputting a transceiver output signal which is representative of the reflected electromagnetic energy;
- amplifier means, connected to the transceiver means and receiving the transceiver output signal, for outputting an output current signal which is representative of the transceiver output signal;
- display means, connected to the amplifier means and receiving the output current signal, for presenting a display signal which is representative of the output current signal, whereby the electromagnetic property is measured; and
- a controller connected to the amplifier means and to the display means, the controller being adapted to control an apparatus for coating the member based, at least partially, upon the reflected electromagnetic energy received by the transceiver means.
- 2. A system as claimed in claim 1, wherein the transceiver means comprises a microwave transmitter and receiver unit.
- 3. A system as claimed in claim 1 wherein the transceiver means comprises:
- an antenna;
- a positive power input terminal;
- a negative power input terminal;
- an oscillator connected to the positive power input terminal;
- a capacitor connected between the oscillator and the negative power input terminal;
- a load resistor connected to the negative power input terminal; and,
- a mixer connected to the load resistor and outputting the transceiver output signal.
- 4. A system as claimed in claim 3, wherein the antenna comprises a horn antenna.
- 5. A system as claimed in claim 3, wherein the oscillator comprises a Gunn diode, the Gunn diode being operated as an emitter and as a local oscillator.
- 6. A system as claimed in claim 3, wherein the mixer comprises a Schottky barrier diode.
- 7. A system as claimed in claim 1, wherein the amplifier means comprises a linearizing amplifier.
- 8. A system as claimed in claim 7, wherein the linearizing amplifier comprises a plurality of gain stages, each of the gain stages being adapted for activation at respective transceiver output signal levels for optimum linearization of the output current signal across a range of transceiver output signal levels.
- 9. A system as claimed in claim 1, wherein the display means comprises a digital readout.
- 10. A system as claimed in claim 1, further comprising a backing plate disposed spaced from and opposite the transceiver means, the member extending between the backing plate and the transceiver means.
- 11. A control system for an apparatus adapted to apply a coating to a member, the control system comprising:
- a transceiver for directing electromagnetic energy at a first region of the member having been coated by the coating and for receiving reflected electromagnetic energy from the first region; and
- a controller connected to the transceiver and connectable to the apparatus for varying a manufacturing process parameter of the apparatus in response to the reflected energy received by the transceiver to thereby adjust an electromagnetic property of a second region of the member when the coating is applied to the second region.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 07/992,238 filed 17 Dec. 1992, now U.S. Pat. No. 5,393,557.
US Referenced Citations (16)
Non-Patent Literature Citations (1)
Entry |
"Nondestructive Microwave Scanning Measurements For Material Property Evaluation," P. R. Wims D. D. Palamer, Review of Progress in Auantitative Nondestructive Evaluation, vol. 10A, Plenum Press, New York, 1991. |
Continuations (1)
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Number |
Date |
Country |
Parent |
992238 |
Dec 1992 |
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