| 摘要 |
A sensing nozzle is carried by a bellows, pneumatic capsule or like fluid motor and establishes a free stream which engages a surface and establishes a back pressure within the nozzle which is proportional to the distance from the sensing nozzle to the engaged surface. A fluidic impacting stream modulator has an input nozzle connected to the sensing nozzle to establish an amplified output which is coupled to the fluid motor and repositions the sensing nozzle to maintain a constant gap between the sensing nozzle and the surface. A tapered nozzle projecting into a recess creates a signal proportional to the gap at the recess entrance. A pair of nozzles to the opposite sides of an object produces a pair of signals, the difference of which is proportional to the width of the object.
|
