Low noise echo ranging system based switching network
A switching network, echo ranging technology, applied in radio wave measurement systems, measurement devices, re-radiation of sound waves, etc., can solve the problems of isolation not reflected, signal-to-noise ratio decline, and high noise, and achieve good noise isolation. effect, reducing the effect of mutual electromagnetic interference
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[0052] Figure 4 It is an ultrasonic measurement system based on single-send and single-receive, and is implemented as a specific circuit designed by a switch network structure. The feature of the present invention is that: the transmitting part includes a low-voltage DC power supply, and the energy ball EAB excitation part reaches the probe through switch switching The low-noise receiving circuit 5 includes two operational amplifiers K1 (7) and K2 (8), plus a detection unit 9, a detection point 10 at the detection output end, and an output end 11 for echo conditioning signals. The voltage at the detection point 10 is led to the single-chip microcomputer control system 6 to form the gain feedback control of the echo system, and the single-chip microcomputer controls EAB and the programmable amplifier K2. The switching sequence of the system S1, S2 and S3 action timing and figure 2 same. Its internal automatic gain control transmits the value collected by the monitoring poin...
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