Contactless microwave measuring instrument of small differences in distance from reflecting surface

摘要

The contactless microwave meter of small differences the distance from the reflective surface comprises a tunable microwave generator (1) whose microwave output connected to the input (34) of hub element (3) whose first output (31) is an input of a reference channel and is connected in one embodiment to the first input (61) of the adding member (6) via a first attenuator (5) with variable attenuation and in the second embodiment directly. The second output (32) of hub element (3) is the input of a testing channel and is connected to the input (71) of the block (7) changes the phase shift of the signal reflected from the reflective surface (9) in the testing channel relative to the signal in the reference channel. Insulating the output (74) of the block (7) The phase shift signal is coupled to the second input (62) of the adding member (6) in one embodiment, directly and in the second embodiment via a first amplifier (14) with variable amplification. The output (64) of the adding member (6) is connected with the control and evaluation unit (13) with an indicator microwave power or voltage or current, whose control output is connected to the input of the tunable microwave generator (1).