Figure 35. Schematic of the on-shore data acquisition system

Figure 34. Locations of TDR bed-level monitors. TDR numbers and the respective cable lengths: TDR 1 (400 ft); TDR 2, 4, 5, and 6 (500 ft); and TDR 7 (700 ft)

Figure 36. Comparison between the reflected signals using a Tektronics 1502 step pulse and a Tektronics 1503 using the impulse signal

TR02-14
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RIVER ICE INFLUENCES ON FORT PECK REACH, MISSOURI RIVER

Bed elevations were recorded using the on-shore data collection system

shown in Figure 35. The coax cable from each probe was connected to one of

eight channels on a multiplexer board. A Campbell Scientific Inc. (CSI) CR10

data acquisition system configured the multiplexer to the desired channel. A

Tektronics 1502 generated the electromagnetic pulse, captured the return signal,

and used 251 points to digitized the reflected image. The digitized image was

read and stored by the CR10 in a local storage module. A computer at CRREL

recovered the data daily using a modem integrated into the DAC package.

12 coil

TDR Trans

SDMX 50

Suppressor

120 VAC

With 7 TDRs

6590

Figure 35. Schematic of the on-shore data acquisition system.

Western Governors University

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