Sergio Calixto
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Dichromated Gelatin in Optics Open
Dichromated Gelatin (DCG) was first used in optics in 1872 by Lord Rayleigh. Then, in 1968, Shankoff suggested its use as a photosensitive material to record interference diffraction gratings and holograms. Diffraction efficiencies of near…
Artery Pulse Waveform Acquired with a Fabry-Perot Interferometer Open
For most patients admitted to a hospital, it is a requirement to continuously monitor their vital signs. Among these are the waveforms from ECG and the pulmonary arterial pulse. At present, there are several electronic devices that can mea…
Fabry–Perot Interferometer Used to Measure Very Low Static Pressure Measurements Open
This paper describes the use of an optical instrument, the Fabry–Perot interferometer, adapted to measure very low pressures. The interferometer consists of two high-reflectance flat mirrors placed one in front of another. In addition, a m…
Gelatin Used as a Transductor in an Optical Hygrometer Based on a Fabry-Perot Interferometer Open
The quantities that are usually measured are time, pressure, temperature, and relative humidity to mention but a few. The word humidity is used when we are dealing with water vapor which is a gas. The instrument used to measure the humidit…
Surface Profile Studies of Photoinduced Gratings Made with DCG Films with Optional Papain Development Open
The use of surface relief structures is increasing in the field of optics. A study of photoinduced relief using dichromated gelatin films with different thickness is described in this paper. Two light sources were used: a laser (λ = 468 nm…
Birefringent optofluidic gratings Open
A set of parallel microfluidic channels behaving as a diffraction grating operating in the Raman-Nath regime has been fabricated and studied. The diffraction efficiency of such structure can be tuned by selecting a liquid with a particular…
Liquid refractive index measured through a refractometer based on diffraction gratings Open
We developed two versions of refractometers to measure the refractive index of liquids. One refractometer comprises a glass cell with a surface relief grating on the inner face of one of its walls, while the other one is a microfluidic cha…
Stimuli-Responsive Systems in Optical Humidity-Detection Devices Open
The use of electronic devices to measure Relative Humidity (RH) is widespread. However, under certain circumstances, for example when explosive gases are present, a spark-free method should be used. Here we suggest the use of stimuli-respo…
Gelatin as a Photosensitive Material Open
Because this issue journal is dedicated to Gelatin, here we present a few applications of gelatin in the field of optics. Optics is the science that studies the production, propagation, interaction and detection of light. Various materials…
Gelatin as Photosensitive Material Open
Because this issue journal is dedicated to Gelatin here we present a few applications of gelatin in the field of optics. It is understood that optics is the science that studies the production, propagation, interaction and detection of lig…
View article: A Wavefront Division Polarimeter for the Measurements of Solute Concentrations in Solutions
A Wavefront Division Polarimeter for the Measurements of Solute Concentrations in Solutions Open
Polarimeters are useful instruments that measure concentrations of optically active substances in a given solution. The conventional polarimetric principle consists of measuring the rotation angle of linearly polarized light. Here, we pres…
Liquid Temperature Measurements Using Two Different Tunable Hollow Prisms Open
This paper describes the design, fabrication, and testing of two hollow prisms. One is a prism with a grating glued to its hypotenuse. This ensemble, prism + grating, is called a grism. It can be applied as an on-axis tunable spectrometer.…
Diffraction grating-based sensing optofluidic device for measuring the refractive index of liquids Open
We describe a simple and versatile optical sensing device for measuring refractive index of liquids. The sensor consists of a sinusoidal relief grating in a glass cell. Device calibration is done by pouring in the cell different liquids of…