Digital radio active particle detector and control for accelerometer

Claim 1

AN ACCELEROMETER COMPRISING A HOUSING, A FLAT MASS ELEMENT WITHIN THE HOUSING AND HAVING A COATING OF RADIOACTIVE ALPHA PARTICLE PRODUCING MATERIAL, MULTIPLE FLAT FLEXIBLE SPRING MEANS SUPPORTING SAID MASS ELEMENT FOR DISPLACEMENT ALONG A SENSITIVE AXIS, AND AN ALPHA PARTICLE DETECTOR SPACED FROM SAID RADIOACTIVE COATING MATERIAL ON SAID MASS ELEMENT, MEANS ENERGIZED BY SAID ALPHA PARTICLE DETECTOR FOR PRODUCING A SIGNAL PROPORTIONAL TO THE CHANGE IN DISPLACEMENT OF SAID MASS ELEMENT FROM SAID ALPHA PARTICLE DETECTOR ALONG SAID SENSITIVE AXIS, AND TORQUE MEANS ENERGIZED BY SAID SIGNAL FOR RESTORING SAID MASS ELEMENT TO A GIVEN POSITION UPON A DISPLACEMENT THEREOF, SAID TORQUE MEANS INCLUDING A PERMANENT MAGNET SUPPORTED WITHIN SAID HOUSING AND PROVIDING A FLUX ALONG SAID SENSITIVE AXIS, AND A TORQUE COIL SUPPORTED BY SAID MASS ELEMENT AND IN FORCE ENGAGING RELATIONSHIP WITH SAID PERMANENT MAGNET FLUX, SAID TORQUE COIL BEING ENERGIZABLE BY SAID SIGNAL TO AXIALLY DISPLACE SAID MASS ELEMENT, SAID MEANS ENERGIZED BY SAID ALPHA PARTICLE DETECTOR INCLUDING AN INTEGRATOR FOR PRODUCING A CONTINUOUSLY INCREASING QUANTITY PROPORTIONAL TO THE INTEGRAL OF THE NUMBER OF ALPHA PARTICLES DETECTED, AND A DIFFERENTIATOR FOR PRODUCING SAID SIGNAL PROPORTIONAL TO THE RATE OF CHANGE OF SAID INTEGRATED QUANTITY, AND FEEDBACK MEANS FOR INTERCONNECTING SAID DIFFERENTIATOR AND THE TORQUE COIL.