Foil Shear Strain Sensors: Model DT3617 Series

When the axis of primary strain is identified, Columbia Series DT 3617 Strain Sensors are designed to measure planar shear strain forces. Each sensor is a comprehensive, compactand simple-to-install gadget that uses the Columbia DTD 2684 Series Fatigue Monitoring Sensors’ established technology.

Two 1000Ω precision strain gage grids are positioned orthogonally on a one mil polyimide substrate, plus a matched set of 1000 Ω bridge completion components make up the DT 3617 Shear Strain Sensor. The complete gage is constructed in a tough, molded silicone rubber housing with four M22759 26-gauge TFE Insulated aviation lead wires.

The sensor’s bottom surface is a polyimide substrate for active strain gage components, which is pre-processed before being bonded to the test structure. The sensor’s top surface comprises axis identification marking to help in aligning the gage with the principal strain axis.

Individual models for compensating materials typically used in airplane structural production are offered. The Columbia Model 5802 Strain Gage Amplifier is used to boost sensor readings and provide strain and temperature outputs.

Note: Exports from the United States are subject to the Export Administration Regulations (EAR) and/or the International Traffic in Arms Regulations (ITAR) authorization procedures.

Two 1000 Ω Precision Strain Gage Grids

90° Rosette Gage

Rugged Construction

Self-Temperature Compensating

Specifications

Operational

Table 1. Source: Columbia Research Laboratories, Inc.

Environmental

Table 2. Source: Columbia Research Laboratories, Inc.

Physical

Table 3. Source: Columbia Research Laboratories, Inc.

¹@25 °C ²As supplied (un-mounted)³Installed Gage

Schematic Diagram

Image Credit: Columbia Research Laboratories, Inc.

Typical Installation of Old Style Strain Gages. 1. Bolt or rivet removed from assembly; 2. Dummy gage(s) bonded to “Z Tab” of same material as structure; 3. Active gage bonded to structure under test; 4. “Z Tab” mounted to structure with bond or rivet; 5. Strain gage leads interwired and soldered to junction block; and6. Entire unit covered with protective material. Image Credit: Columbia Research Laboratories, Inc.

Installation of Columbia Strain Sensor. 1. Strain Sensor bonded to surface under test; 2. Leads connected to wire harness; and3. Coat sensor and wires with waterproofing material. Image Credit: Columbia Research Laboratories, Inc.

Ordering Information

Table 4. Source: Columbia Research Laboratories, Inc.

Advantages

Twice as much output

A higher level of precision

No compromise on structural integrity

Installation time is reduced

Optimal temperature compensation