Accession Number : ADA291491

Title :   Visualization of Circuit Card Electromagnetic Fields.

Descriptive Note : Final rept.,

Corporate Author : ZWILLINGER AND ASSOCIATES NEWTON MA

Personal Author(s) : Zwillinger, Daniel

PDF Url : ADA291491

Report Date : 20 JAN 1995

Pagination or Media Count : 86

Abstract : Circuit boards are used in nearly every electrical appliance. Most board failures cause differing currents in the circuit board traces and components. This causes the circuit board to radiate a differing electromagnetic field. Imaging this radiated field, which is equivalent to measuring the field, could be used for error detection. Using estimates of the fields radiated by a low power digital circuit board, properties of known materials, and available equipment, we determined how well the following technologies could be used to visualize circuit board electromagnetic fields (prioritized by promise): electrooptical techniques, magnetooptical techniques, piezoelectric techniques, thermal techniques, electrodynamic force technique. We have determined that sensors using the electrooptical effect (Pockels effect) appear to be sufficiently sensitive for use in a circuit board imaging system. Sensors utilizing the magnetooptical effect may also be adequate for this purpose, when using research materials. These sensors appear to be capable of achieving direct broadband measurements. We also reviewed existing electromagnetic field sensors. Only one of the sensors (recently patented) was specifically designed for circuit board measurements. (MM)

Descriptors :   *OPTICAL DETECTION, *ELECTROOPTICS, *MAGNETOOPTICS, *CIRCUIT BOARDS, *OPTICAL CIRCUITS, ELECTROMAGNETIC FIELDS, MAGNETIC FIELDS, ELECTRIC FIELDS, INFRARED DETECTORS, ELECTRIC CURRENT, MAGNETIC DETECTORS, PIEZOELECTRIC EFFECT, ELECTRICAL EQUIPMENT, FAILURE(ELECTRONICS).

Subject Categories : Electrooptical and Optoelectronic Devices
      Optical Detection and Detectors
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE