Patent ID: 7587896

Claim:
An integrated radiation sensor assembly ( 10 ) comprising: a gas compression unit ( 104 ) having a first longitudinal axis ( 308 ); a gas expansion unit ( 112 ) having a second longitudinal axis ( 366 ) disposed perpendicular to the first longitudinal axis ( 308 ); a rotary motor ( 302 ) comprising a rotor ( 324 ) supported for rotation with respect to a motor rotation axis ( 328 ) and disposed with the motor rotation axis ( 328 ) substantially parallel with the second longitudinal axis ( 366 ); a motor shaft ( 320 ) extending from the rotor ( 324 ) and including a first mounting feature ( 336 ) extending along a third longitudinal axis ( 334 ), and a second mounting feature ( 340 ) extending along a fourth longitudinal axis ( 342 ), and wherein each of the third and fourth longitudinal axes ( 334 , 342 ) are disposed substantially parallel with and radially offset from the motor rotation axis ( 328 ); a first drive coupling means coupled between the first mounting feature ( 336 ) and the gas compression unit ( 104 ) for driving a gas compression piston ( 304 ) with a reciprocal linear translation directed along the first longitudinal axis ( 308 ); a second drive coupling means coupled between the second mounting feature ( 340 ) and the gas expansion unit ( 112 ) for driving a gas displacing piston ( 362 ) with a reciprocal linear translation directed along said second longitudinal axis ( 366 ); and, a radiation sensor array ( 12 ) attached to a cold end of the gas expansion unit ( 112 ).