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
Encryption using alternate authentication key
UV exposure method for reducing residue in de-taping process
Method of estimating remaining constant current/constant voltage charging time
Device for transmitting data between a serial data bus and working modules such as actuator modules and/or I/O modules
Spreading technique applied to broadband mobile communications by satelite relying on DVB-RCS
Digital photographing apparatus and control method for evaluating validity of an auto-focus operation
Image processing device and information storage medium including motion vector information calculation
  Randomly Featured Patents
Absorbent article with deformation inducing means
Process for producing two-layer automotive coats using an aqueous base coat
Semiconductor structure with different lattice constant materials and method for forming the same
Chrysanthemum plant named `Logic`
Torsion bar anchor
Input buffer with voltage clamping for compatibility
Fiber reinforced heat-resistant polyolefin compositions
Electrical circuit board with directly attached display unit and method of assembling same
Decelerometer formed by levitating a substrate into equilibrium
Stairway riser