Resources Contact Us Home
Sensor for measuring a vibrating surface obscured from view

Image Number 8 for United States Patent #7564567.

Described are a sensor and a method for measuring a vibration of a surface obscured from view. The sensor includes a narrowband source of a terahertz beam, a beamsplitter, a beam combiner and a terahertz detector. The beamsplitter splits the terahertz beam into a sample beam for irradiating the surface and a reference beam. The beam combiner combines the sample beam scattered from the surface and the reference beam. The terahertz detector generates an electrical signal based on a modulation of the power of the combined beams due to the vibrating surface. The electrical signal indicates a characteristic of the surface vibration. Homodyne or heterodyne detection can be utilized. Advantageously, the sensor can see surfaces that are covered, concealed or otherwise obscured behind optically opaque materials, including plastic, cloth, foam, paper and other materials. Thus the sensor has a wide variety of applications where conventional vibrometers are not practical.

  Recently Added Patents
Battery comprising circuitry for charge and discharge control, and method of operating a battery
Pixel interleaving configurations for use in high definition electronic sign displays
Method of fabricating a solar cell with a tunnel dielectric layer
Rotation angle sensor
Image forming apparatus and job request control method instructed by authenticated users
  Randomly Featured Patents
Optical coupler for coupling an optical fiber into a waveguide
Closure of polyethylene oxide film
Stable dried aluminum hydroxide gel
Diesel fuel temperature controlling apparatus
Vacuum deposition of selenium alloy
Mop handle with reservoir
Coffee and tea making or brewing apparatus
Fluorocarbons as anti-inflammatory agents
Connecting node and method for constructing a connecting node
Double-hung window with uniform wood interior