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 17 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
Image processing apparatus capable of using replacement component, image forming apparatus capable of using replacement component, and method of administrating replacement component
Telephone line seizure module
Personalized health communication system
Packaging sleeve
Picture quality control method and image display using same
Optimizing federated and ETL'd databases with considerations of specialized data structures within an environment having multidimensional constraint
Haworthia plant named `AMSTERDAM`
  Randomly Featured Patents
Aqueous compositions containing stabilized enzymes
Rotary distributor type fuel injection pump
Method and equipment for producing rolls of moistened web material
Multipurpose, multifunction antenna
Turbomolecular pump drive method and apparatus
Device for determining air mass in a line and including a separation outlet having a wind shield structure
Methods and apparatus for accessing information from multiple remote sources
Automated composite annular structure forming
Writing device, record carrier and method of writing information blocks, and reading device for reading information blocks
Method for fabricating a vertical trench inductor