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US 7,923,678 B2Granted
Sensing method including interrogation of a holographic sensor
AssigneeCambridge Enterprise Limited
InventorsChristopher Robin Lowe, Jeffrey Blyth, Anthony Peter James
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Abstract
A sensing method, which comprises subjecting a holographic sensor to an external physical interaction to which the sensor is sensitive, and observing a change in the holographic image.
Claims17
A sensing method, which comprises:
- subjecting a holographic sensor to an external physical interaction, wherein the sensor is a volume hologram recorded in a support medium that is directly sensitive to the external physical interaction, wherein the volume hologram produces a holographic image;
- and
- observing a change in the holographic image;
- wherein the external physical interaction is temperature, and wherein the change in the holographic image is a change of color or a change of image to show that the volume hologram is genuine;
- wherein the support medium is a polymer that is highly sensitive to changes in temperature such that the polymer has a rigid structure which collapses upon an increase in temperature, thereby producing a significant shift in a wavelength of reflection of the polymer;
- and
- wherein the volume hologram comprises a reflection hologram.
4 more elements
A sensing method, which comprises:
- subjecting a holographic sensor to an external physical interaction, wherein the sensor is a volume hologram recorded in a support medium that is directly sensitive to the external physical interaction, wherein the volume hologram produces a holographic image;
- and
- observing a change in the holographic image;
- wherein the external physical interaction is magnetism, and wherein the change in the holographic image is a change of color or a change of image to show that the volume hologram is genuine;
- wherein the support medium is magnetic;
- and
- wherein the volume hologram comprises a reflection hologram.
4 more elements
Dependencies are inferred from the claim text.