Instruments
Weldable Strain Gauges
Weldable strain gauges are installed on steel structural members.
Slope Indicator manufactures a spot-weldable strain gauge and an
arc-weldable strain gauge.
Operating Principle The arc-weldable strain gauge consists of steel strip and an elec-
tro-magnetic coil sealed inside a steel tube body. The strip is held in
tension between the two ends of the body. The body is fixed to a
structural member by weldable mounting blocks.
Strain in the structural member is transferred through the mounting
blocks and the body to the steel strip inside. An increase in tensile
strain increases tension in the strip, and a decrease in tensile strain
decreases tension in the strip.
The coil is used to “pluck” the strip, causing it to vibrate at a
frequency relative to its tension. The vibration of the strip within the
magnetic field of the coil induces a frequency signal which is trans-
mitted to the readout device.
The readout device processes the frequency signal using calibration
factors that relate frequency to strain in the strip, and then displays a
number representing microstrain. For additional information, please
refer to “Data Reduction” later in this chapter.
VSWE LD0 9. cdr
Steel Strip
Body
Electro-Magnet
Mounting Block
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