Educação matemática pela arte
Gusmão, Lucimar Donizete
2013-08-28
Search results
24 records were found.
Comment: 10 pages, 2 figures. Accepted for publication in ApJ Letters
A fibre-pigtailed dual-sensitivity integrated optical Mach-Zehnder Interferometer sensor chip for liquid analytes is described. Thin overlays of Ta2O5 and reference structures have been integrated to enhance sensitivity and compensate for drift and attenuation.
A fibre-pigtailed dual-sensitivity integrated optical Mach-Zehnder Interferometer sensor chip for liquid analytes is described. Thin overlays of Ta2O5 and reference structures have been integrated to enhance sensitivity and compensate for drift and attenuation.
An inexpensive and robust method for acquiring multiple outputs from integrated optical sensor devices using a 1D CCD array is described in this paper. An example is gven of the development of an instrument based on the use of an integrated optical Mach-Zehnder interferometer (MZI) refractive index transducer. The technique is especially promising for application to multianalyte sensors where several outputs need to be interrogated simultaneously. The high sensitivity and low noise demonstrated by the system will enable the use of cheap, stable LED light sources in practical instruments. Introduction: Integrated optical transducers for the real-time measurement of interactions between biological molecules and for the specific detection of chemical and biochemical species are the subject of growing interest. Applications of this techno...
Integrated optical transducers for the detection of chemical and biochemical species and for optical measurements on bulk media are the subject of intense research effort. While many such sensors have been demonstrated in research laboratories worldwide, commercial exploitation of integrated optical sensors has proceeded slowly. Progress towards incorporating multiple-output sensors, based around the use of integrated optical Mach-Zehnder interferometers (MZIs), into a robust and inexpensive instrument is described in this paper. A 1D CCD array is used to acquire the multiple outputs, resulting in ready alignment and a flexible approach to device reconfiguration and offering particular promise for application to multianalyte transducers where several signals must be interrogated simultaneously. The sensitivity and low noise demonstrate...
The fabrication and operation of robust integrated optical refractometers, suitable for precise measurements of small changes without ambiguity over a wide range of refractive indices, is described. The design primarily uses an optical fibre coupled dual-sensitivity integrated optical Mach–Zehnder interferometer (MZI) sensor chip incorporating 3×3 directional coupler combiners and internal referencing. High-index tantalum pentoxide (Ta2O5) films were deposited on the waveguide surface in order to increase sensitivity and measurements of their response to liquid analyte index have been carried out by passing aqueous sucrose solutions over the sensor surface. These devices are intended for application as high-sensitivity multi-purpose chemical sensors and bio-sensors.
