KEYWORDS: Luminescence, Temperature metrology, Sensors, Silica, Signal to noise ratio, Fiber lasers, Temperature sensors, Optical fibers, Semiconductor lasers, Modulation
We study the feasibility of using decay-time measurements in order to develop a temperature sensor superior to the intensity-based one. We measured the fluorescence output of erbium-doped silica fiber segment upon pumping with 980-nm radiation. For low pumping powers (from 4 mW to 10 mW, in our case), the fluorescence power increases rapidly with pumping power. At an intermediate pumping power that depends on fiber dopant concentration and fiber geometry, the fluorescence power starts to saturate, approaching asymptotically the saturation value. We also report that the time constant of transition from excited level 4I13/2 to ground level 4I15/2 depends on the pumping power.
KEYWORDS: Temperature metrology, Luminescence, Sensors, Fiber optics sensors, Temperature sensors, Optical filters, Fiber optics, Silica, Optical fibers, Signal to noise ratio
We describe experimental results demonstrating the performance of the erbium-doped silica fiber as a remote temperature sensor in the temperature interval [21 C - 96 C]. We present the measured fluorescence spectrum corresponding to the energy levels 2H11/2 and 4S3/2. This sensor incorporates simple signal detection in a band and data analysis system, incorporating a power ratio to reduce noise effects. We find the channel responsivity, the power ratio, and the sensitivity for a number of possible filters. The best responsivity is above 0.2μW/C, and its sensitivity is 0.0065 C-1 with the filters transmitting in the [527 nm - 537 nm] and [545 nm - 555 nm] spectral bands. With a custom-made filter, centered on 545 nm, even higher sensitivity is predicted.
We study the feasibility of using decay-time measurements in order to develop a temperature sensor superior to the intensity-based one. We measured the fluorescence output of erbium-doped silica fiber segment upon pumping with 980-nm radiation. For low pumping powers (from 4 mW to 10 mW, in our case), the fluorescence power increases rapidly with pumping power. At an intermediate pumping power that depends on fiber dopant concentration and fiber geometry, the fluorescence power starts to saturate, approaching asymptotically the saturation value. We also report that the time constant of transition from excited level 4I13/2 to ground level 4I15/2 depends on the pumping power.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.