Strain gauge measures

Inclinometry is taken with increased resolution at those parts of the track where 2 strain gauges are located. A diagram of the respective positions of the wheels and the sole working strain gauge (g2) can be found here. A typical stream of strain gauge data is shown below :

and details for each wheel are shown below here :

Wheel 1	Wheel 2	Wheel 3	Wheel 4

From each (CW) 'inclinometry' dataset, an algorithm (file://home/imc/pointing/progs/strain.for) extracts, for each interaction of the four wheels over the two gauges, the peak strain (load) above the background (i.e. ignoring the downturns in the readings following passage of the wheels). A record of the date and the (max) strain readings applicable to each wheel are kept in a file called /home/imc/pointing/inc/strain.data. Historical records of the loadings are generated by /home/imc/pointing/progs/strainplot.exe.

LATEST DATA

One of the strain gauges has not been operational since 2004 so only the data for the remaining working gauge is presented. The data shown cover the time since the second gauge failed in October 2004. The left-hand plot shows the 'raw' strain readings for each wheel (w1 w2 w3 w4), while the right-hand plot shows the same data normalised to wheel 4 (w4=1).

January 2012 to present

Raw strain data

Ratio-ed strain data

June 2009 to December 2011

Raw strain data

Ratio-ed strain data

Jan 2008 to May 2009

Raw strain data

Ratio-ed strain data

The first 1000^d-worth of these data are archived here :
Raw Data, gauge 1
Raw Data, gauge 2
Ratio-ed Data, gauge 1
Ratio-ed Data, gauge 2