How to install a fiber optic sensor mounting rod

Installing a fiber optic sensor mounting rod requires careful surface preparation, adhesive application, and secure routing to ensure accurate strain or temperature measurements.

Step 1: Plan the Sensor Route

Before installation, determine the path of the fiber optic sensor along the mounting rod. Ensure the route avoids sharp bends and areas of potential mechanical interference, as fiber optics are sensitive to bending and stress . Measure the required length and consider slack for thermal expansion or movement.

Step 2: Prepare the Surface

Clean the mounting rod thoroughly to remove dust, grease, or oxidation. Lightly abrade the surface if necessary to improve adhesion. For metallic or composite rods, use a neutralizing or conditioning agent to ensure the adhesive bonds effectively . Proper surface preparation is critical for long-term sensor stability.

Step 3: Select and Apply Adhesive

Use a suitable adhesive such as M-Bond 200 epoxy or AE-10, which provide strong adhesion and rapid room-temperature curing . Apply a thin, even layer along the rod where the fiber will be mounted. For temporary or non-critical applications, double-sided tape can be used, but adhesive bonding is more reliable for long-term installations.

Step 4: Mount the Fiber

Carefully lay the fiber along the adhesive-coated rod, pressing gently to ensure full contact without introducing stress or kinks . If using a mounting rod with pre-drilled spacers or slots, insert the fiber into these guides to maintain alignment and prevent movement. For temperature sensors, ensure the fiber tip is positioned correctly in the designated hot spot or measurement area .

Step 5: Cure and Protect

Allow the adhesive to cure according to the manufacturer's instructions. After curing, apply a protective layer such as RTV silicone to shield the fiber from environmental factors like moisture, vibration, or mechanical abrasion . Ensure the fiber is not under tension and that any excess cable is coiled with gentle loops to prevent strain.

Step 6: Route and Secure Cables

Route the fiber optic cable from the mounting rod to the data acquisition system, avoiding sharp bends and pinch points. Use soft straps or clips to secure the cable along supporting structures, leaving some slack to accommodate movement or thermal expansion . Avoid tight bends at feedthroughs or connectors to prevent signal loss.

Step 7: Test the Installation

Once installed, verify the sensor's functionality by checking signal continuity and calibration. Ensure the fiber is properly bonded and that the mounting rod is stable. For high-resolution strain or temperature measurements, confirm that the fiber is free from stress concentrations that could affect readings . By following these steps, a fiber optic sensor can be securely mounted on a rod, providing reliable measurements while minimizing the risk of fiber damage or signal degradation.