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The device takes periodic readings at 30cm and 110cm in depth producing a subsurface temperature profile that shows daily and seasonal weather changes in contrast to the surface temperature.
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It is a highly accurate pair of thermistors placed 30 cm and 110 cm subsurface and encased within a thin stainless steel probe. The Earth Thermometer can be used for short- or long-term monitoring of ground temperature and thermal gradient proximal to geothermal sites, hot springs or radioactive sources. Readings are taken at programmable regular intervals and stored in a proximal data logger. Battery life and memory are sufficient for up to one year of stand-alone data collection.
The inventor inserts the internal thermistor string into the seamless stainless steel rod.
Subsurface temperature swings over 24 hour period
Changes in ground temperature and thermal gradient over distance can indicate the presence of a subsurface exothermic source. Changes over time can indicate changes in that exothermic source. Geothermal resources, steam fields, hot springs, buried power lines, buried infrastructure, natural uranium deposits and buried radioactive wastes have heat signatures that may be identified in the near surface. Temperature measurement can be a useful diagnostic and monitoring tool.
A plot showing temperature read out at 30cm and 110cm over 50 days.
The Earth Thermometer can be used for gathering subsurface ground temperature for multiple exploration purposes. *Note the seasonal warming trend.
The Earth Thermometer is designed for short- or long-term deployment and is redeployable. A sensor string containing two thermistors at 30cm and 110cm (depths can be reconfigured for specific applications) are inserted into a stainless steel casing. A one metre long data cable is provided to connect the endcap to a data logger box. Data is automatically logged in 15 minute intervals (intervals can be reconfigured for specific applications) and stored in a local solid-state memory housed in an external data logger box for up to one year. The Earth Thermometer is comprised of highly accurate electronics calibrated to 0.001C and has minimal drift over time.
Components include:
Images and Video
The Earth Thermometer can be used by high schools, colleges and Universities interested in teaching about soil temperature in the near surface. Once deployed the Earth Thermometer records the subsurface temperature at pre-selected depths (10cm, 30cm, 50cm, 70cm, 90cm or 110cm). Data curves are easy to interpret with rain events and seasonal weather events and [...]
Continue readingThe Earth-Thermometer is effective in monitoring the regional extent of coal seam fires more than pyrometers. Coal seam fires are subsurface events of smoldering coal seams. These events are instigated naturally (lightning, grass or forest fires) or due to industrial accidents and commence at the surface opening of a coal seam but propagate along the [...]
Continue readingThe Earth Thermometer is capable of mapping the size and extend of coal seam fires.
Continue readingThe Earth Thermometer is accurate, reliable and reuasable but it does not work for every application. Please let us know what you intend to use it for and we can tell you if this is the best tool. Also, since this device relies on the daily weather signal it may be best to order two so that you can reference a position.
-Units ship in 3 to 5 weeks-
Hot Dry Rocks Pty Ltd is Australia’s leading geothermal consultancy. With an expertise in crustal heat flow, Hot Dry Rocks has led the industry in designing, manufacturing and supplying the Portable Electronic Divided Bar, the industry benchmark for rock thermal property measurements. The Earth Thermometer is being introduced to the industry to supplement existing geophysical exploration tools such as magnetics, gravity, MT and seismic.
36 Garden Street
PO Box 251, South Yarra, 3141
South Yarra
Victoria
Australia
Phone: +61 (0)3 9827 7740
E-mail: sales@earth-thermometer.com
Website: www.hotdryrocks.com
Our office is a five minute walk from the South Yarra Train Station. From Central Melbourne take any train on the Cranbourne, Frankston, Packenham and Sandringham lines. Trains leave Melbourne’s Flinders, Parliament and Richmond Station every 7- 10 minutes.
