Passive ranging technique for infrared search and track (IRST) s

Passive ranging to a target reflecting solar radiation

Passive ranging to source of known spectral emission

Passive ranging to source of known spectral emission

Passive ranging to source of known spectral emission to cue...

Passive remote sensor of chemicals

Passive ring laser rate of turn device with acousto-optic modula

Passive ring laser rate of turn devices

Passive ring resonator angular rate sensor

Passive ring resonator gyro with polarization rotating ring path

Passive ring resonator gyroscope

Passive ring resonator laser angular rate sensor

Passive sampling interferometric sensor arrays

Passive smoke plume opacity monitor

Passive stabilization of a fiber optic nonlinear interferometric

Passive stereovision range finder

Passive submarine range finding device and method

Passive target detector

Passive tilt correction on two axes

Passive zero shear interferometers