An optical positioning sensor is realized by combining optical projection and a virtual camera model. This technique provides a low cost and non-contact measurement and has the potential to provide real-time 6 DOF measurements of an object. The optical sensor first generates a projection pattern that is observable on the surrounding walls, cameras are used to track the motion of the projected optical pattern, and the motion of the optical sensor can thus be tracked indirectly. In this technique, the optical sensor itself is treated as a virtual pinhole camera. A virtual image is generated that carries the angular characteristics of the optical pattern. The virtual image and the images of the projected optical pattern on the walls taken by real cameras are then processed through a photogrammetry-based bundle adjustment to give a position and orientation estimate of the optical sensor. Experiment is performed to calibrate the angular information of the optical pattern. Monte-Carlo simulation is performed to analyse the measurement uncertainty. The simulation result has good agreement with the experimental result for 0.9 m translation test along a precision rail. The optical sensor with the virtual camera model solution is preferable to provide real time measurements for simple-to-complex environments.
We present a wideband and high pumping-efficiency L-band erbium-doped fiber (EDF) amplified spontaneous emission
(ASE) source using a two-stage double pass backward (DPB) pumping configuration.DPB configuration has been proved
to have a high pumping-efficiency. In this paper we use a two-stage DPB pumping configuration to generate a stable
L-band ASE source for the first time. The source consists of two sections of EDF, a 1480nm pumping laser diode (LD)
which is divided into two portions to pump two sections of EDF separately. By using a power splitter, the pumping
power of two stages can be adjusted proportionally. The effects of EDF length and pump power arrangement on the
output characteristics of L-band ASE spectrum, output power and mean wavelength are theoretically investigated. The
results show that the pumping-conversion efficiency and the linewidth can be improved significantly by optimizing the
fiber length ratio and pump ratio of the two-stage DPB configuration. Based on former work, the total fiber length is
chosen at 19m in this paper. With the total fiber length fixed, the proposed source has a high pumping efficiency of 53%,
an output power of 111mW, and a broadening linewidth of 49nm with the mean wavelength at 1580.18nm under the
optimizing fiber ratio of 0.842 and pump power ratio of 0.5.
In this paper, a simple single-backward configuration with a section of un-pump fiber is presented to achieve a stable
L-band superfluorescent fiber source (SFS). The effects of the structural parameters on the output characteristics of the
L-band SFS in terms of output spectrum, mean wavelength, and linewidth are theoretically examined. By selecting
suitable structure parameters, an L-band SFS with mean wavelength insensitive to pump power is achieved under a
pump power of 190mW, corresponding to a mean wavelength of 1583.20nm, an output power of 47mW, and a spectral
linewidth of 49.6nm. The proposed L-band SFS design shows its tremendous advantages as simple structure and good
performances that make it be useful in WDM system, fiber optic gyroscopes and fiber sensor systems applications.
We have experimentally investigated a new two-stage C+L-band (1525 to 1605-nm) amplified spontaneous emission (ASE) fiber source using a dual forward pumping configuration. The proposed source offers a high pumping efficiency of 24.6%, output power of about 52 mW, and a wide bandwidth of 80 nm. Without using any external spectral filters, the source has a low spectral ripple between 2.4 and 2.9 dB for different pumping power levels. This designed configuration is also suitable for high-efficiency L-band ASE. The obtained source will be useful in characteristic measurement for wavelength-division multiplexing components and spectrum-sliced multiwavelength fiber sources for local access networks.
We present a two-stage dual-forward pumped configuration to achieve a wavelength stable L-band amplified
spontaneous emission (ASE) source. The effects of EDF length and pump power arrangements on the characteristics of
L-band ASE spectrum, output power, and mean wavelength are investigated. The results show that not only the pumping
conversion efficiency can be improved largely but also the pump power independent mean wavelength operation can be
achieved by optimizing the fiber length ratio and pump ratio of the dual-forward pumped configuration as comparing to
that of the conventional double-pass forward configuration.
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