초록 ▼

A multipurpose in situ underground measurement system comprising a plurality of long electrical resistance elements in the form of rigid reinforcing bars, each having an open loop “hairpin”configuration of shorter length than the other resistance elements. The resistance elements are arranged in pai

A multipurpose in situ underground measurement system comprising a plurality of long electrical resistance elements in the form of rigid reinforcing bars, each having an open loop “hairpin”configuration of shorter length than the other resistance elements. The resistance elements are arranged in pairs in a unitized structure, and grouted in place in the underground volume. The electrical resistance of each element and the difference in electrical resistance of the paired elements are obtained, which difference values may be used in analytical methods involving resistance as a function of temperature. A scanner sequentially connects the resistance-measuring apparatus to each individual pair of elements. A source of heating current is also selectively connectable for heating the elements to an initial predetermined temperature prior to electrical resistance measurements when used as an anemometer.

대표청구항 ▼

An in situ measurement system for measuring temperatures and other parameters and conditions in an underground volume of interest, said system comprising: a plurality of steel bar resistance elements emplaced in spaced relation in the underground volume of interest, each said bar having the same uni

An in situ measurement system for measuring temperatures and other parameters and conditions in an underground volume of interest, said system comprising: a plurality of steel bar resistance elements emplaced in spaced relation in the underground volume of interest, each said bar having the same uniform and known temperature functional resistance characteristics along its length, each said element having a U-shaped open loop “hairpin”configuration with two parallel legs in close thermal proximity, said elements being arranged in pairs with the elements in each said pair sharing nearly a common path in close thermal proximity throughout the extent of the shorter element in the pair, and with the free ends of each said element disposed adjacent the free ends of the other elements; and measurement means for obtaining, for said pairs, the electrical resistance of each element and the difference in electrical resistance of the two elements in each pair, whereby said resistance difference values may be used in analytical methods involving resistance as a function of temperature to obtain information with respect to said underground volume.