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Active alignment for two-beam interferometers
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10.1063/1.2150823
/content/aip/journal/rsi/77/1/10.1063/1.2150823
http://aip.metastore.ingenta.com/content/aip/journal/rsi/77/1/10.1063/1.2150823

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the Michelson’s optics showing how tilting the moving mirror causes the recombinant beams to diverge from the optical axis, thus causing a shift to the fringe pattern.

Image of FIG. 2.
FIG. 2.

(Color online) Schematic diagram of the FT-NIR spectrometer in transmission mode. White light passes through the sample and into the Michelson for analysis. Interference fringes from the laser diode are used for control.

Image of FIG. 3.
FIG. 3.

Schematic diagram of PZT actuator layout and relative photodetector locations as viewed from the output plane.

Image of FIG. 4.
FIG. 4.

Attenuation gain for mirror tilt in one axis.

Image of FIG. 5.
FIG. 5.

(Color online) Contour of the expected phototransistor signal for different tilts and the actuator constant.

Image of FIG. 6.
FIG. 6.

(Color online) Three-dimensional surface plot of the expected phototransistor signal for different tilts and the actuator constant.

Image of FIG. 7.
FIG. 7.

(Color online) Contours of all the expected phototransistor signals for different tilts and the actuator constant.

Image of FIG. 8.
FIG. 8.

Contours of all the expected phototransistor signals for different tilts and all the actuators moving.

Image of FIG. 9.
FIG. 9.

Typical phototransistor signal for a scan in the tilt axis.

Image of FIG. 10.
FIG. 10.

Schematic diagram representing lines of tilt angles for which signals from different pairs of phototransistors are in phase.

Image of FIG. 11.
FIG. 11.

(Color online) Mirror positions at which the phase is constant between the outputs of different pairs of phototransistors.

Image of FIG. 12.
FIG. 12.

(Color online) Contours of the magnitudes of phase differences.

Image of FIG. 13.
FIG. 13.

Grid pattern of points at which the phase difference is minimum.

Image of FIG. 14.
FIG. 14.

(Color online) Diagram showing the integration of initial and dynamic alignment. Diagnostics test is performed at the end of the scan process.

Image of FIG. 15.
FIG. 15.

(Color online) Contours of phototransistor experimental signals for different tilts and all the actuators moving.

Image of FIG. 16.
FIG. 16.

(Color online) Contour of phototransistor experimental signal for different tilts and all the actuators moving.

Image of FIG. 17.
FIG. 17.

(Color online) Mirror positions at which the phase is constant as between the outputs of different pairs of phototransistors (practical case).

Image of FIG. 18.
FIG. 18.

(Color online) Contours of the magnitudes of phase differences (practical case).

Image of FIG. 19.
FIG. 19.

(Color online) Estimated phototransistor positions plotted together with points at which the phase difference is minimum.

Image of FIG. 20.
FIG. 20.

Transmission spectra of bandpass filter 1 with center wavelength .

Image of FIG. 21.
FIG. 21.

Transmission spectra of bandpass filter 2 with center wavelength .

Image of FIG. 22.
FIG. 22.

Transmission spectra of bandpass filter 4 with center wavelength .

Image of FIG. 23.
FIG. 23.

Original spectrum and spectra obtained by windowing the interferograms of filter 1 with Hamming function. Original spectrum has been plotted with dotted line where windowed spectra with solid line.

Image of FIG. 24.
FIG. 24.

Original spectrum and spectra obtained by windowing the interferograms of filter 1 with Tukey function. Original spectrum has been plotted with dotted line where windowed spectra with solid line.

Tables

Generic image for table
Table I.

Center wavelengths and bandwidths of interference filters as specified by the manufacturer. (FWHM: full width at half maximum.)

Generic image for table
Table II.

Center wavelengths and bandwidths of the interference filters as determined from experimental data.

Generic image for table
Table III.

Figures of merit for the four window functions applied to filter 1.

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/content/aip/journal/rsi/77/1/10.1063/1.2150823
2006-01-25
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Active alignment for two-beam interferometers
http://aip.metastore.ingenta.com/content/aip/journal/rsi/77/1/10.1063/1.2150823
10.1063/1.2150823
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