YE PROPOSE TO INVESTIGATE A SENSITIVE ELECTROMAGNETIC FIELD SENSOR WHOSE OUTPUT IS COUPLED VIA AN OPTICAL FIBER TO REMOTE PROCESSING ELECTRONICS.

YE PROPOSE TO INVESTIGATE A SENSITIVE ELECTROMAGNETIC FIELD SENSOR WHOSE OUTPUT IS COUPLED VIA AN OPTICAL FIBER TO REMOTE PROCESSING ELECTRONICS. THIS DEVICE SHOULD PROVIDE A CONVENIENT AND VERY SENSITIVE METHOD OF DETECTING PULSED ELECTROMAGNETIC FIELDS. IT ALSO WILL BE INEXPENSIVE AND CAN BE QUITE SMALL IN SIZE AND EASILY DISPLAYED FOR A SUBMARINE PLATFORM. THE NAVY HAS A SPECIFIC REQUIREMENT FOR REMOTE SENSING OF ELECTROMAGNETIC FIELDS FROM VERY LOW FREQUENCIES TO THE VISIBLE SPECTRUM. WE PROPOSE A SIMPLE SENSOR OF ELECTROMAGNETIC FIELDS OF INTERMEDIATE FREQUENCIES SAY, FROM 100 KHZ TP 100 MHZ, OR FOR VERY RAPID CHANGES OF THE MAGNETIC FIELD. AS DESCRIBED BELOW, THE SENSOR ITSELF IS INEXPENSIVE, NEEDS ONLY BATTERIES FOR OPERATION AND CAN BE CONNECTED WITH OPTICAL FIBERS TO A REMOTELY LOCATED SIGNAL PROCESSOR. EVEN IN ITS SIMPLEST FORM, THE SENSOR HAS SOME DIRECTIONAL PROPERTIES, AND THE EXTENSION OF THE PRINCIPLE TO SENSOR ARRAYSIS OBVIOUS. SINCE THE OPERATION IS BASED ON AMPLITUDE MODULATION OF SIGNAL THERE IS NO REQUIREMENT FOR SINGLE MODE POLARIZATION CONSERVING FIBERS.