Boots – shoes – and leggings
Patent
1976-08-30
1978-08-08
Morrison, Malcolm A.
Boots, shoes, and leggings
324158D, 325363, 364484, 364828, G06G 718, G01R 1900
Patent
active
041060962
ABSTRACT:
A dual-frequency technique for electronically measuring high-order derivatives by frequency mixing is described. The technique utilizes an ac modulation at two distinct but synchronous frequencies to produce a derivative signal at a useful difference frequency, which is unique to the order of the derivative being measured. By appropriate selection of the frequencies, significant advantages are obtained compared to the conventional method in which derivatives are measured at harmonics of a single frequency. The technique is illustrated with a practical measurement of the second derivative of the electrical characteristic of a silicon rectifier diode.
REFERENCES:
patent: 3745473 (1973-07-01), Klein et al.
patent: 3812433 (1974-05-01), Bradley
patent: 3882402 (1975-05-01), Jensen
patent: 4001680 (1977-01-01), Bylund et al.
patent: 4062632 (1977-12-01), Dixon
Warren et al.; "An Analysis of the Intermodulation Method of Distortion Measurement"; Proc. of the Ire; vol. 36, pp. 457-466, Apr. 1948.
Klein et al.; Generating the Sum or Difference of Two Signal Frequencies; Electronic Engineering; Mar. 1969, pp. 378-380.
Dyer; Concurrent Characterization of SCR Switching Parameters for Inverter Applications, SCR & Solid State Technology, Apr. 1965--pp. 15-20.
Bell Telephone Laboratories Incorporated
Krass Errol A.
Morrison Malcolm A.
Urbano Michael J.
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