Polarizer Cpl
Camera with waveguide grating interferometric head
Grating interferomtry (GI) is one of the most useful optical methods for inplane the new camera based on low cost waveguide grating interferometric head. Due to insensitivity to vibration, small dimensions and weight, wireless connections and automated fringe pattern analysis it can be used.
The quick development of novel photonics, mechanical and optoelectronic elements allows to design and build compact, low-cost, multifunctional devices providing the high sensitivity measurements in outdoor conditions. In the paper three novel cameras which take full advantage of optomechatronics In this paper the novel, miniaturized full-field optical extensometer for full-field in-plane displacement measurement is presented.
It consists of two modules: illumination/detection module (IDM) and Measurement Head (MH) based on grating interferometry. In the paper we study the performance of IDM, which provides the object illumination beam and captures the output interferogram. The characterization of VCSEL comprises determination of polarization state, intensity distribution, coherence path length and shape of the wavefront after being collimated by beam forming optics. The detector matrix has been tested mainly in respect of the signal to noise ratio at various exposure times and its spatial uniformity of sensitivity.
Growing microtechnology raises a demand for development of novel measurement instrumentation allowing for determination of displacement field in microspecimens or microsystems under test. New strict measurement requirements defined by a size of microobjects, their fragility and need for high measurement resolution and accuracy have been determined. On the other hand microtechnology offers new means for development of instrumentation with innovative architecture which lead to a design of lowcost.
The IDM integrates VCSEL emitting 665 nm light with one or many longitudinal and transverse modes, beam forming aspheric optics, imaging optics, detector matrix (CMOS B&W 1280×1024 pixels camera) and evaluation board. Preliminary numerical simulations [1] revealed that the total optical path difference (OPD) between the beams guided in MH might be up to 0.6 mm. The coherence path length (CPL) was tested by monitoring fringe pattern contrast in the function of OPD in T-G interferometer. In the case of monomode VCSELs, the measured CPL equals a few centimeters (fig. 2 a). In the case of multimode VCSELs the contrast varies (fig. 2b), however the high contrast region around 0 OPD was larger than 0.6 mm (fig. 2c).
All characterized light sources meet requirements of IMS in respect of the time and spatial coherence Polarization state studies revealed that every measured VCSEL emits light with partially linear polarization regardless of supply voltage value, however
The collimating lens forms the plane beam with diameter of 6.5 mm.
Tminimize the measurement errors and unwanted parasitic light and to provide uniform measurement sensitivity in the area of interest the collimatebeam is required. The investigation of wavefront quality was performed igrating shearing interferometer (fig. 4), in which the first derivative owavefront is given by the phase resulting from interference of two slightldisplaced beams (fig. 5.). requirements concerning polarization are met. The linearly polarized light with proper orientation of polarization plane makes it able to avoid beam deploarization or polarization changes while being guided in MH medium, and consequently leads to high interference pattern contrast.
The phase encoded in the interferogram was determined by temporal phase shifting method of fringe pattern analysis [2]. The transverse aberration was estimated for less than 0.06λ. It proves that the quality of the investigated wavefront is fully sufficient for grating interferometry based measurement.
About the Author
Chris Holigan a professianl writer , it provides the high quality products, such as Linear Power Adapter Manufacturer, Universal USB Power Adapter, Universal USB Power Adapter, and many more.
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