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

Image Number 5 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
Wireless device with extendable antenna
Creation and use of test cases for automated testing of media-based applications
Immunotherapy in cancer treatment
Rewriting branch instructions using branch stubs
Image forming apparatus
Sperm factor sequences
Apparatus for merging spatial audio streams
  Randomly Featured Patents
Photoconductive member for an electrophotographic machine and method of forming same
Method for fabricating a spring structure
Torsional ultrasound hand piece that eliminates chatter
Apparatus for marinating meat products
Scanner and method for operating a scanner
Baton projectile
Laser apparatus for effectively projecting the axis of rotation of a rotating tool holder
Device for holding membrane filter
Product package