It has been prototyped the basic optics and electronics of a crossed Czerny-Turner spectrograph to work at different
wavelengths. The optical system of the spectrograph prototype has been simulated using OSLO software in order to
optimize the capture of the light spectrum. The study that is presented in this paper is based on the optimization of the
focusing optics orientation that would obtain the smallest y-spot width onto a linear CCD, for different central
wavelengths. It has been changed the orientation of the focusing optics trough the simulation, and changes in the spot
diagram has been observed and plotted. Finally, we have obtained recommendations using these results, how to adjust
the focusing optics in real spectrographs for different central wavelengths. Simulated spectrograph had about 0.25 nm
mean resolution with a focusing optics of 100 mm focal length.
Nowdays, polymers like hydrogels that respond to well defined stimuli, have a particular interest in fields like
optoelectronics, biotechnology, materials, etc. One of this polymers is the NIPAAM, that posses thermo optics
properties. This work is oriented to the design and implementation of a temperature sensor using fiber optics and having
as sensitive part a sintetized hydrogel of polyNIPAAM and MeOXA of reversible thermosensible characteristics. For this
setup we use a glass ampoule which is coupled to two pieces of plastic, inside the ampoule it is placed the hydrogel. The
working principle relies in the turbidity changes in a well known temperature called critical. We present the experimental results of the designed and implemented device.
An alarm system as extrinsic sensor on optical fibers for detecting and controlling inflammable liquids based on thermosensitive
proprieties of the PNIPAAm hydrogel is presented. The changes on the optical proprieties of the PNIPAAm
with the temperature (being its LCST 32°C), induce abrupt changes on the light intensity and they act as an alarm signal,
which is transmitted by optical fibers and after they will be processed by an optoelectronic circuit, responsible to active
an alarm. An appropriate system consists of the hydrogel connected between its ends to two segments of plastic optical
fibers (source and receiver) and they turn on the alarm when a photo detector does not receive light when the hydrogel
becomes when it reaches threshold of temperature. The characterization of the hydrogel and the experimental results are
presented for a prototype.
We report the use of new hydrogels based on poly-N-isopropylacrilamide and MeOXA in order to measure temperature using optical transmittance. We have obtained thermo-responsive hydrogels based on the radical copolymerization of N-isopropylacrylamide (NIPAAm) and bis-macromonomers of 2-methyl-2-oxazoline (MeOXA). The hydrogels show conformational transitions at defined temperatures, which are a function of the molar ratio NIPAAm / MeOXA inside of the hydrogel. The temperatures of transition have been determined by means of 1H NMR spectroscopy and by turbidity measurements using an optical setup with optical fibers and a diode laser. We show the first experimental results and we discuss some future applications such as an optical switch or a device for optical sensing.
This work shows results of the tests carried out with system designed with plastic optical fibers (POF) useful to determine the discrete levels of contained liquids in recipients of regular dimensions. It use the property of transmission of the light. The design is functional and cheaper.