Carlson

Carlson

CARLSON instruments are elastic wire strain meters containing two coils of highly elastic steel wire.

One of the coils increases in length and electrical resistance when a strain occurs, while the other decreases. The ratio of the two resistances is independent of temperature (except for thermal expansion) and therefore the change in resistance ratio is a measure of strain. The total resistance is independent of strain since one coil increases the same amount as the other decreases due to a change in length of the meter. Therefore, the total resistance is a measure of temperature.
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Carlson Joint and Foundation Meters

Carlson Joint and Foundation Meters

Joint meters and foundation meters are similar to strain meters except they have greater range. This...

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Carlson Stress Cell

Carlson Stress Cell

CARLSON Stress Cells are plates with a strain-meter sensing element mounted on one face.

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Carlson Piezometer

Carlson Piezometer

A device to measure water pressure in the pores of granular material such as soil.

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Carlson Concrete Meter

Carlson Concrete Meter

A rod-like device which simulates a bar of reinforcing steel.

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Carlson Resistance Thermometer

Carlson Resistance Thermometer

Used for the remote reading of temperature where quick response is not required.

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Carlson Strain Meter

Carlson Strain Meter

A device which can be embedded in concrete to reveal the internal deformations.

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Carlson MA-6B Readout

Carlson MA-6B Readout

Reads all CARLSON instruments.

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