The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A real-time sensor based on a lensed photonic crystal fiber (LPCF) is developed for measuring external refractive index (ERI). The sensor head is composed of a LPCF and a micro-mirror encapsulated in a silica tube. The device and the measurement process are extremely simple and fast.
We present a simple photonic crystal fiber (PCF)-based reflection type interferometer insensitive to temperature for refractive-index measurement. By simply collapsing the airholes at a middle point and forming a reflector at the end of a PCF, the interferometer could be implemented. The PCF sensor showed a low thermal sensitivity even without any compensation process. The feasibility as a refractive-index...
A Sagnac interferometer based on an optical microfiber is demonstrated. It shows good adjustability of transmission, which enables it to be used as linear edge filter, optical variable attenuator, or gain flattening filter.
A compact and simple fiber interferometer sensor suitable for external refractive index measurement is presented. By collapsing the air-holes of a PCF at a point along its length and forming a mirror at the end, we could get the reflection type interferometer. As a refractive index sensor, we show that the reflection spectrum of it moves to the longer wavelength direction with refractive index but...
We propose a simple but effective in-line interferometeric sensor based on photonic crystal fiber (PCFs) and hollow optical fiber (HOF). A short piece of HOF was spliced between PCFs for inducing modal interference. The temperature-induced shift of the interference fringes was experimentally monitored. It was linearly shifted toward the longer wavelength direction with a sensitivity of about 8 pm/degC.
The Fabry-Perot (FP) type interferometric high temperature sensor formed with double fiber cavities is proposed and its performance is demonstrated. The reflection spectrum of the fabricated FP interferometer was measured at several temperatures and analyzed in its Fourier domain. The proposed FP sensor was tested up to 1000degC and the results showed that it could be utilized as a precise high temperature...
We developed a fiber-optic current sensor system for the over-current protection relay. A spun fiber was employed to eliminate linear birefringence effect, and to compare the efficiency a twisted and a Flint glass fiber were also tested. From the experimental results, we obtained less than 2% of linear error with spun fiber output according to current increases. The SNR at 60 Hz is measured to be...
A hybrid interferometer, a Michelson and a Mach-Zehnder combined, is proposed to demodulate a fiber-optic voltage sensor. By using quadrature sampling with internal triggers, optical path difference can be obtained and translated into voltage output.
A reliable distributed temperature monitoring is very important for electric power systems because a power system failure will result in an enormous loss of life and property. Fiber Bragg grating (FBG) sensors, which have been studied intensively for last decade, can be very efficient tools for these applications because they are immune to EMI and can be highly multiplexed, which enables efficient...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.