Curved Strain Sensors: Model DT3747 Series

The DT3747 sensors from Columbia were created to precisely detect strain on curved mounting surfaces. The precision, robustnessand easy installation of the flight-qualified Series DTD2684 are all present in these sensors. Similar systems have been used to track the growth of rocket motors.

These sensors may also be utilized in a variety of industrial and military applications, such as pipe expansion measures, explosive body applications, aircraft surface loadand all forms of engine monitoring.

The sensors in the Series DT3747 are designed to detect circumferential strain around the diameter of the material to which they are attached. The required mounting radius is specially molded into the sensor’s body, allowing for operator alignment control during sensor installation.

Models are provided to correct for typical materials used in aircraft structural manufacturing, as well as alternative materials as needed. The Columbia Model 5802 Strain Gage Amplifier can also be used to power and signal condition the sensor’s strain output.

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

Strain Outputs

Self-Temperature Compensating

Choice of Cylindrical Mounting Radius

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. ² Installed 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; and 6. 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; and 3. Coat sensor and wires with waterproofing material. Image Credit: Columbia Research Laboratories, Inc.

Ordering Information*

Table 4. Source: Columbia Research Laboratories, Inc.

*Mounting Radius Required upon Ordering

Advantages

Twice as much output

A higher level of precision

No compromise on structural integrity

Installation time is reduced

Optimal temperature compensation