1,865 research outputs found
An accelerometer for spaceborne application with interferometric readout
Full text linkAccelerometers for space applications are typically based on a capacitive readout. Here we present the design of an accelerometer based on a classical mass spring mechanical system with an interferometric readout. The heterodyne interferometer is completely fiber based with a 1064 nm diode laser source and has a subpicometer resolution at 1 Hz. We present and discuss the design and the characterization of the interferometer, the foreseen performances of the whole accelerometer and the characterization strategies of the same
Le novità riguardanti la realizzazione pratica del metro all'INRIM: quali sono i laser che realizzano il metro che non vanno tarati?
No full textVengono illustrate le realizzazioni pratiche del metro presso l'Istituto Nazionale di Ricerca Metrologic
Fast processing spectral discrimination for hyperspectral imagers based on interferometry
No full textHyperspectral imagers based on interferometry associate with each pixel of the image the spectrum calculated with the Fourier transform of the measured interferogram. This class of hyperspectral imagers is intrinsically faster than imagers based on optical filters and on dispersive means when the noise is dominated by detector noise. This speed advantage could be hampered by the large computing power necessary to extract the spectral content of the image from the large number of data acquired by the camera. We have realized a real-time algorithm to discriminate different spectra of the pixels of a scene directly from the acquired interferograms. The technique showed very good discrimination of pixels illuminated by narrow band radiation. This algorithm is based on principal component analysis and could be implemented directly in the camera processor to discriminate spectra in the image in real time using factorization with singular value decomposition
Subnanometer absolute measurements by means of mixed synthetic‐optical homodyne interferometer
No full text
Fabry–Perot-based Fourier-transform hyperspectral imaging allows multi-labeled fluorescence analysis
No full textWe demonstrate the ability of our hyperspectral imaging device, based on a scanning Fabry–Perot interferometer, to obtain a single hyper-image of a sample marked with different fluorescent molecules, and to unambiguously discriminate them by observing their spectral fingerprints. An experiment carried out with cyanines, fluorescein, and quantum dots emitting in the yellow–orange region, demonstrates the feasibility of multi-labeled fluorescence microscopy without the use of multiple filter sets or dispersive means
- …
