Heat Pulse Method
For the heat-up or heat-pulse method (HPM), a hybrid cable consisting of glass fibers and electrical conductors is used. An electrical voltage is applied to these conductors so that a short-circuit current flows. This causes the entire cable to heat up. The resulting temperature rise in the cable is measured with the glass fibers. In addition to the conductive heating of the cable environment, an additional advective heat transport occurs when a fluid, e.g. water, flows around the cable, which leads to a significantly lower heating of the cable. In this way, flow processes can be detected and thus leakages located. Through calculations, both the flow velocity of the fluid and the thermal parameters of the surrounding material can be determined.
Frost pulse method
For applications where the heating method is technically too complex, GTC® has developed the Frost Pulse Method (FPM). In contrast to the HPM, a refrigerant is used which is introduced into a temperature probe tube. The temperature rise is then measured with temperature sensors and evaluated in the same way as HPM. This method has the advantage that no electrical energy has to be available; the disadvantage is that only a qualitative evaluation can be made.
GTC Case Study
- 2015 Temperature Monitoring of Multiple Borehole Heat Exchangers
- 2017 DTS Fabritius
- 2016 Dornstädter, Retrofit
- 2015 Dornstädter, LEAKAGE DETECTION TEMPERATURE AS A TRACER
- 2015 Dornstädter, Temperaturmessung im Wasserbau – Sichere Überwachung von Dämmen und Deichen seit mehr als 60 Jahren
- 2014 Dornstädter, Full Automatic Leakage Detection at Ilisu Dam by the Use of Fibre Optics
- 2011 Aufleger, Distributed fiber optic temperature measurements in embankment dams with central core – new benchmark for seepage monitoring
- 2010 Heske Der Enhanced-Geothermal-ResponseTest als Auslegungsgrundlage und Optimierungstool
- 2010 Dornstädter In Situ Detection of Internal Erosion
- 2009 Aufleger DFOT monitoring in CFRDs – Technical gimmick or useful complementary monitoring system?
- 2021 New solutions for remote monitoring of pre-cast concrete service reservoir and sludge lagoon