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Title: Narrow field electromagnetic sensor system and method

A narrow field electromagnetic sensor system and method of sensing a characteristic of an object provide the capability to realize a characteristic of an object such as density, thickness, or presence, for any desired coordinate position on the object. One application is imaging. The sensor can also be used as an obstruction detector or an electronic trip wire with a narrow field without the disadvantages of impaired performance when exposed to dirt, snow, rain, or sunlight. The sensor employs a transmitter for transmitting a sequence of electromagnetic signals in response to a transmit timing signal, a receiver for sampling only the initial direct RF path of the electromagnetic signal while excluding all other electromagnetic signals in response to a receive timing signal, and a signal processor for processing the sampled direct RF path electromagnetic signal and providing an indication of the characteristic of an object. Usually, the electromagnetic signal is a short RF burst and the obstruction must provide a substantially complete eclipse of the direct RF path. By employing time-of-flight techniques, a timing circuit controls the receiver to sample only the initial direct RF path of the electromagnetic signal while not sampling indirect path electromagnetic signals. The sensor systemmore » also incorporates circuitry for ultra-wideband spread spectrum operation that reduces interference to and from other RF services while allowing co-location of multiple electronic sensors without the need for frequency assignments.« less
Inventors:
 [1]
  1. (Livermore, CA)
Issue Date:
OSTI Identifier:
870692
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5576627
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
narrow; field; electromagnetic; sensor; method; sensing; characteristic; provide; capability; realize; density; thickness; presence; desired; coordinate; position; application; imaging; obstruction; detector; electronic; trip; wire; disadvantages; impaired; performance; exposed; dirt; snow; rain; sunlight; employs; transmitter; transmitting; sequence; signals; response; transmit; timing; signal; receiver; sampling; initial; direct; rf; path; excluding; receive; processor; processing; sampled; providing; indication; burst; substantially; complete; eclipse; employing; time-of-flight; techniques; circuit; controls; sample; indirect; incorporates; circuitry; ultra-wideband; spread; spectrum; operation; reduces; interference; services; allowing; co-location; multiple; sensors; frequency; assignments; electromagnetic signals; circuit controls; receive timing; signal processor; timing signal; timing circuit; electromagnetic signal; transmit timing; substantially complete; sensor employs; narrow field; coordinate position; signal process; field electromagnetic; electromagnetic sensor; magnetic sensor; /324/340/342/

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