Data from September 19, 2001
Thermal Gradients
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Today I am looking at data from a resistor string intended to measure thermal gradients in the Bay and Delta. It consists of nine PT-100 thermistors, connected in series with a current source. The thermistors are mounted in a 1-1/4" PVC pipe, spaced a foot apart. Joe Adolfo built much of the electronics and helped with the LabView data acquisistion program.
There are two data files now. Both represent measurements with the thermistor string hanging near the ceiling in the lab (TH 208):

The data are read into data with an IDL routine. The plots below are made with IDL.

thm10918.000 (five-minute run)
raw channel
voltages

source
voltages across
the thermistors

source

thm10918.000 (five-hour run)
raw channel
voltages

source
voltages across
the thermistors

source