Resources Contact Us Home
Heterodyne interferometer arrangement

Image Number 2 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
Dynamic lookup service in a distributed system
Substantially aligned boron nitride nano-element arrays and methods for their use and preparation
Medicament delivery device and a method of medicament delivery
Method of treating cancer using a survivin inhibitor
Method and apparatus for feeding a polyurethane mixture into hollow bodies
Systems and methods for tracking mobile terrestrial terminals for satellite communications
Rule-based stimulation program search
  Randomly Featured Patents
Sequential hybridization of fungal cell DNA and method for the detection of fungal cells in clinical material
Cheese hardening machine for pasta filata cheese
Securable locking device for a movable element of an automobile vehicle seat
Powdered phenol-formaldehyde resin
Arrangement for the gathered collection of sheets of a recording medium
Fume hood
Bi-lobular air bag
Separation and recovery of hydrogen and normally gaseous hydrocarbons from net excess hydrogen from a catalytic reforming process
Blow mold shell and shell assembly
Fuse holder apparatus with flexible detenting