Alexandria, VA--The U.S. Patent and Trademark Office has assigned Coherent(NASDAQ: CHOR; Santa Clara, CA), patent No. 8,129,684, for "detection of hidden objects by terahertz heterodyne laser imaging." The patent was developed by Eric Mueller, at Coherent-DEOS in Bloomfield, CT.
The patent abstract states: "A THz-frequency heterodyne imaging method is used to remotely detect objects concealed in or under a person's clothing. One THz-frequency beam is scanned over a person being examined. A portion of the beam penetrates the persons clothing and is reflected by an object concealed under the person's clothing. The reflected portion the beam is mixed with another beam of THz-frequency radiation having a different frequency to provide a signal having an intermediate frequency (IF) including image data representative of the concealed object."
The full-text of the patent can be found here.
The patent abstract states: "A THz-frequency heterodyne imaging method is used to remotely detect objects concealed in or under a person's clothing. One THz-frequency beam is scanned over a person being examined. A portion of the beam penetrates the persons clothing and is reflected by an object concealed under the person's clothing. The reflected portion the beam is mixed with another beam of THz-frequency radiation having a different frequency to provide a signal having an intermediate frequency (IF) including image data representative of the concealed object."
The full-text of the patent can be found here.
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