| 摘要 |
1,001,986. Measuring electrically. E.I. DU PONT DE NEMOURS & CO. April 3, 1963 [April 3, 1962], No. 13171/63. Addition to 981,219. Heading G1N. [Also in Divisions HIT and H3T] The core 16 (Fig. 1) of a coil in the tank circuit of a transistor oscillator 10 is made of materials sensitive to temperature, pressure and magnetic field strength, whereby the oscillations frequency is indicative of the values of these parameters. The A.C. signal is amplified by transistor 30 and transmitters from antenna 39 to a receiver where it is mixed with the output of a local oscillator to determine the change in frequency, by audio means, or by a frequency meter, or by a CRO display. Suitable core materials are described in Specifications 927,312, 930,650 and 932,678 also are referred to. |
