DEVICE FOR INSPECTING AIR GAP Russian patent published in 2008 - IPC G01B7/14 

FIELD: electric engineering.

SUBSTANCE: device can be used for inspecting static and dynamic changes in gap between two metal objects. Device has transmitting and receiving metal electrodes disposed in same plane and attached onto dielectric washer. Additional receiving electrode is made onto other side of dielectric washer which is disposed symmetrically to receiving one. Additional dielectric washer is introduced between additional receiving and first metal object. Transmitting electrode is made in form of open circuit around receiving electrode. Additional electrode in form of open circuit is made around receiving and transmitting electrodes. Transmitting electrode is connected with output of high frequency oscillator. Receiving electrodes are connected with direct and inverse inputs of sync detector. Output of sync detector is connected with input of local area profile detector; control input is connected with output of oscillator. Output of detector of oscillator is connected with input profile detector of second metal object. Output of profile detector is connected with input of minimal distance detector. Outputs of all detectors are connected with input of gap signal former. Ends of additional electrode are connected with inputs of differential amplifier which has output connected with input of amplitude detector, which detector has out connected with additional input of gap signal former. End effects of capacitive measuring device can be successfully eliminated and magnetic field, which induces electro-motive force in open circuit, which electro-motive force is proportional to meaning of space.

EFFECT: improved truth of measurement of mutual position and state of first and second objects.