发明名称 |
SPEKTRUMERFASSUNG VON LICHTBÖGEN UND RADIOFREQUENZEN |
摘要 |
PCT No. PCT/US90/06113 Sec. 371 Date Mar. 18, 1993 Sec. 102(e) Date Mar. 18, 1993 PCT Filed Oct. 24, 1990 PCT Pub. No. WO92/08143 PCT Pub. Date .A principal object of the invention is to detect sparks or arcs (12) in electric circuits (13) or otherwise to detect a signal having a spectrum of a broad band of distinct instantaneous radio frequencies in radio frequency noise. The invention rejects extraneous narrow-band signals having frequencies within the broad band, such as by means of filters (21, 27, 29) or a balanced mixer arrangement (32-39). The mixer 37 may be fed from a radio frequency signal unbalanced to balanced converter (32) having an input (25) coupled to a source of the signal having the spectrum and having balanced outputs connected to the mixer inputs (35, 36). Alternatively, the radio frequency mixer (37) may receive the output of a wide band noise generator (68) at its other input (36, FIG. 5). A combination of a multitude of the distinct instantaneous radio frequencies indicative of the spectrum or the arc (12) is detected, such as with a frequency combination detector (42) having an input (40) coupled to the radio frequency mixer output (38). |
申请公布号 |
DE69024975(T2) |
申请公布日期 |
1996.06.27 |
申请号 |
DE1990624975T |
申请日期 |
1990.10.24 |
申请人 |
HENDRY MECHANICAL WORKS, GOLETA, CALIF., US |
发明人 |
HAM, HOWARD, M., JR., SANTA YNEZ, CA 93460, US;KEENAN, JAMES, J., SANTA BARBARA, CA 93110, US |
分类号 |
G01R29/08;G01R29/26;G01R31/00;G01R31/12;H01H1/00;H02H1/00 |
主分类号 |
G01R29/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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