Passive optical transponder
First Claim
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1. In an optical identification and communication system having a combination interrogator and receiver for generating and receiving radiation signals;
- a passive optical transponder comprising a phosphor device for receiving a converting light from the interrogator, a transponder optic positioned between said phosphor device and said interrogator for collecting and focusing light of a specified wavelength from the interrogator onto the surface of said phosphor, thereby converting the light from the interrogator to a different wavelength and re-transmitting the converted light along the same path back to the receiver in a beam that is re-collimated by said transponder optic, allowing a response light of a different color from the interrogator light to be used to locate and identify friendly forces.
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Abstract
An optical identification and communication system wherein an interrogator sends out a broad illuminator beam outside the visible range. Some of this radiation is collected by the transponder optic and focused on a converting phosphor. The response light is recollimated by the transponder optic and transmitted directly back at the interrogator. The use of co-axial optics along with color filters and an electronic "shutter" in the interrogator enables the transmitted and received radiation to be separated.
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2 Claims
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1. In an optical identification and communication system having a combination interrogator and receiver for generating and receiving radiation signals;
- a passive optical transponder comprising a phosphor device for receiving a converting light from the interrogator, a transponder optic positioned between said phosphor device and said interrogator for collecting and focusing light of a specified wavelength from the interrogator onto the surface of said phosphor, thereby converting the light from the interrogator to a different wavelength and re-transmitting the converted light along the same path back to the receiver in a beam that is re-collimated by said transponder optic, allowing a response light of a different color from the interrogator light to be used to locate and identify friendly forces.
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