Sensor for underground duct probe

Details Sensor for underground duct probe Sensor for underground duct probe

1983-05-23

1985-07-09

Levy, Stewart J.

Measuring and testing

With fluid pressure

Leakage

73661, 310334, 310356, G01M 324

Patent

active

045274193

ABSTRACT:
A sensor for use on the front end of a flexible, resilient probe for use in an underground duct of the type which contains one or more current-carrying cables. The sensor is provided with a signal generating device for detecting a particular operating condition of a cable in the duct when the sensor moves through the duct adjacent to the cable. In one embodiment of the sensor, acoustical signals are sensed by a crystal when such acoustical signals originate from a leak in the pressurized sheath surrounding the cable. In another embodiment of the sensor, a coil senses the magnetic field surrounding the cable so that electrical shorts occurring in the cable can be monitored. In a third embodiment of the sensor, a heat detector is provided so that the sensor can detect hot spots in a duct.

REFERENCES:
patent: 2395034 (1946-02-01), Bokovoy
patent: 3168824 (1965-02-01), Florer et al.
patent: 3363450 (1968-01-01), Simpkins et al.
patent: 3745829 (1973-07-01), Franchi

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