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Method and apparatus for electromagnetically measuring parameters of electrically conductive high temperature materials
| Details |
Inventors: Linder, Sten V.;
Assignee: Studsvik Energiteknik AB (Nykoping, SE)
Primary Examiner: Strecker; Gerard R.
Assistant Examiner: Snow; Walter E.
Attorney, Agent or Firm: Burns, Doane, Swecker and Mathis
Parameters of electrically conductive material at high temperature are measured by generating, by means of a transmitter coil, an electromagnetic alternating field which induces currents in the material and by detecting, by means of a receiver coil, a specific component of the secondary electromagnetic alternating field generated by the induced currents and dependent on the measured parameter, the frequency of the generated electromagnetic alternating field being such that the penetration depth of the field into the material is of the same geometrical order of magnitude as the characteristic geometrical dimension of the system, such as the distance between the receiver coil and the material. The specific component of the secondary electromagnetic alternating field is detected by means of a synchronous detector connected to the receiver coil and controlled by a phase-shifted signal from the transmitter. |
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DETAILED DESCRIPTION The apparatus illustrated by a block diagram in FIG.
1 includes a transmitter coil 1, supplied with alternating current at constant frequency and constant current strength with the aid of a stable-frequency signal generator 2, e.
g.
a crystal-controlled oscillator or the general mains supply when the frequency is suitable, a power amplifier 3 with variable amplification, and a current control circuit 4 for sensing the magnitude of the current supplied to the transmitter coil 1 and controlling the gain of the power amplifier 3 in response thereto via a loop 5, for maintaining the current constant.
The apparatus further includes a receiver coil 7, which is connected to the signal input terminal of a conventional synchronous demodulator 9 via an input amplifier 8.
The control signal input terminal of the synchronous demodulator is connected to the transmitter signal side of the apparatus via a circuit 10, i.
e.
to the output terminal of the power amplifier 3.
The signal output terminal of the synchronous demodulator is connected to a signal processing circuit 11, which can quite simply contain a measuring instrument, a recorder or the like for registration and/or display or presentation of the magnitude of the measurement signal obtained from the synchronous demodulator 9.
The signal processing circuit 11 can however also include a microcomputer, for example, for conversion of an obtained measurement, in accordance with a known relationship between the magnitude of the measurement signal obtained and the quantity of interest.
The primary task of the circuit 10 is to shift the phase of the control signal collected from the transmitter side of the apparatus, so that the synchronous demodulator 9 detects the desired component of the alternating voltage signal induced in the receiver coil 7.
The phase shift, which can be provided in any way well-known to one skilled in the art, thus corresponds to the phase shift between the alternating current supplied to the transmitter coil and the resulting electromagnetic alternating field at the measuring coil (without influence from measured quantity), and the special phase shift which is desirable for the particular measuring task
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Metal Working 
