Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method and apparatus to determine spatial distribution of magnitude and phase of electro-magnetic fields especially optical fields










Image Number 13 for United States Patent #3950103.

A method and apparatus for numerical determination of the distribution of magnitude and phase of a time harmonic electromagnetic, particularly an optical, wave field by using the wavefront of a reference wave as the optical reference surface and by introducing additional information to the recording process such that the field becomes uniquely determined and this is realized by the recording of three interference fringe patterns which belong to variations of the reference field distribution. A reference field is chosen whose spatial distribution is similar to the unknown field whereby fringes are obtained the position of which varies slowly with the recording coordinates. The recorded data are numerically evaluated and this may be done conveniently in a computer. After these measurements are made the reference beam is shifted by an optical element e.g. a prism, gaseous wedge, electro-optical diffraction device placed in the reference optical path and a second set of measurements is made. In this way a reference field whose spatial distribution is not known precisely is introduced but the system is such that the reference spatial distribution information is used and then eliminated from the information finally obtained on the unknown wavefield.








 
 
  Recently Added Patents
Semiconductor device
Communicating channel state information using predictive vector quantization
Vaccine composition against Streptococcus pyogenes
Method and system for security authentication of radio frequency identification
Kit and method for the capture of tumor cells
Method and apparatus for radio antenna frequency tuning
Alkaline battery
  Randomly Featured Patents
Oligonucleotide derivative comprising an aromatic compound
Method and apparatus for cleaning, coating and curing receptor substrates in an enclosed planetary array
Induction melting of metals without a crucible
Image recording method and apparatus
Frame for pictures and the like
Signal input device
System and method for financing commercial transactions
Casing structure
Electrophotographic process and apparatus therefor
Artifact correction for motion artifacted images associated with the pulmonary cycle