# Can FBG Sensors Measure Temperature and Strain Simultaneously?

**URL:** <https://forum.ofscn.net/t/can-fbg-sensors-measure-temperature-and-strain-simultaneously/239>\
**Category:** OFSCN Technical Knowledge Base\
**Tags:** fbg-technology, fbg-temp-sensor, fbg-strain-sensor, fbg-displacement\
**Created:** [January 19, 2026, 12:54pm UTC](https://forum.ofscn.net/t/can-fbg-sensors-measure-temperature-and-strain-simultaneously/239 "2026-01-19T12:54:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![frostweaver](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/f/da6949/32.png) [@frostweaver](https://forum.ofscn.net/u/frostweaver)\
**Post date:** [January 19, 2026, 12:54pm UTC](https://forum.ofscn.net/t/can-fbg-sensors-measure-temperature-and-strain-simultaneously/239/1 "2026-01-19T12:54:37Z")

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If both parameters change at once, how is the cross-sensitivity issue resolved?

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**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\
**Post date:** [January 19, 2026, 1:09pm UTC](https://forum.ofscn.net/t/can-fbg-sensors-measure-temperature-and-strain-simultaneously/239/3 "2026-01-19T13:09:41Z")

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FBG sensors exhibit cross-sensitivity between temperature and strain, meaning both parameters influence the Bragg wavelength shift. To resolve this for simultaneous measurement, a common method involves using two Fiber Bragg Gratings:

1. **Reference FBG (Temperature Sensor):** One FBG is isolated from mechanical strain, typically by packaging, so it only responds to temperature changes. This FBG acts as a dedicated [OFSCN® Fiber Bragg Grating Temperature Sensor](https://www.ofscn.net/fbg-products/temperature-sensor.html), providing the temperature-induced wavelength shift.
2. **Measurement FBG (Strain and Temperature Sensor):** A second FBG is directly exposed to both the strain and temperature of the measured object. This is typically an [OFSCN® Alloy Tube Packaged Fiber Bragg Grating Strain Sensor](https://www.ofscn.net/fbg-products/strain-sensor.html). Its wavelength shift will be a combination of both effects.

By subtracting the temperature-induced wavelength shift (obtained from the reference FBG) from the total wavelength shift of the measurement FBG, the pure strain-induced wavelength shift can be accurately determined.

Here is an example of an [OFSCN® Alloy Tube Packaged Fiber Bragg Grating Strain Sensor](https://www.ofscn.net/fbg-products/strain-sensor.html):

 ![OFSCN® Alloy Tube Packaged Fiber Bragg Grating Strain Sensor](https://forum.ofscn.net/uploads/default/original/1X/90c11b90deb49f0cd88a54ecac0d956bcddf353c.jpeg)

You can find more detailed technical specifications for our strain sensors here: [OFSCN® Fiber Bragg Grating Strain Sensor](https://www.ofscn.net/fbg-products/strain-sensor.html).