G20 Gauge

Detailed description of G20 gauge

The Saugnac recording strain gauge, or G20 unit, which use the measurement, amplification and recording qualities of the G2 Gauge, makes it possible to monitor to the nearest 1/10th of a millimeter the changes in distance between 2 points A and B, which are several meters apart. The distance between these points may be several meters.

The G20 unit is used particularly to study the “movement in space” of structures.

Example: recording the distortion in the base of diagonal ribs of vaulting 7.20 m across. Church of Saint Saturnin de la Forêt Sainte Croix (91). State-qualified heritage property architect (DPLG) Louis PRIEUR

Example: Recording the yielding of load-bearing walls of barrel/groin vaulting.
Medina of Fès – Medersa Attarine XIV century

Details of the G20 unit

Diagram of vaulting fitted with a G20 unit

1 : Cold drawn invar wire ø 1.65 mm Mean coefficient of linear expansion = 2 x 10-7 / °C between 0 and 50°
2 : Fixed point
3 : Return pulley with ball bearings
A : Unit
B : Protective cover

⇒ Individual studies on request : contact us