Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Heterodyne interferometer arrangement










Image Number 4 for United States Patent #5331400.

A heterodyne interferometer arrangement comprises a two-frequency light source, an optical reference branch for producing a reference signal, an optical measuring branch, which includes an interferometer unit causing a phase rotation of the light beams in response to a length to be measured, as well as a measuring transducer arranged at the output of the interferometer unit, and a phase comparator arranged subsequent to the reference transducer and the measuring transducer. In order to minimize linearity errors, the measuring transducer comprises first and second optoelectric measuring transducer units, which respond to light components orthogonal to each other and which are followed by two phase comparators whose output signals represent phase differences between the first or the second measuring signal on the one hand and the reference signal on the other, and a mean value generation circuit whose output signal represents the mean value of the first and second phase differences. The mean value of the phase differences is virtually free from non-linearity.








 
 
  Recently Added Patents
Coupling device having piercing member
Weak acid recovery system for ethanol separation processes
Method and apparatus for selective decoding in a wireless communication system
Method and apparatus for user selection of advertising combinations
Soft co-processors to provide a software service function off-load architecture in a multi-core processing environment
Plants and seeds of corn variety CV294874
Stopper, motor, and disk drive apparatus
  Randomly Featured Patents
Method and apparatus for processing image data
Secondary battery having nonaqueous electrolyte solution
Ceramic composite
Universal tank overlay
Track lighting system and lighting truss for use therein
Support structure of windshield
Nonionic shampoo
Photoflash lamp with loose powder composition and method of making
Air-cooled diesel outboard motor
Shaft selection aiding apparatus for selecting optimum shaft for a golfer