Fixed star light interference optical path difference detection and fringe tracking method and system
A technology of optical path difference and optical interference, which is applied in the field of high-resolution imaging of celestial bodies, can solve the problems of loss of interference fringes and the inability to guarantee the accuracy of optical interferometry, and achieve the effect of improving accuracy and clear resolution
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Embodiment 1
[0046] This embodiment specifically illustrates the system structure (implemented optical path) of the present invention.
[0047] Such as Figure 5 As shown, the system includes a light source input system, an interference optical path forming system, a detection and tracking system, and an optical path adjustment assistance and alignment system;
[0048] The light source input system includes a collimating lens group 3, an optical filter group 4, a pinhole 2 and an aperture stop 5, and the white light source 1 passes through the above-mentioned structures in sequence and then enters the interference optical path;
[0049] The interference optical path is: on the basis of the Michelson interference system, the plane mirror on the interference arm is replaced by the roof prisms 8, 10, and after the two beams are combined, they pass through the dispersive prism 11, the reflector 15, and the imaging lens 12 for imaging. The compensation plate 19 is used to compensate the inhere...
Embodiment 2
[0056] This embodiment specifically illustrates the optical path difference detection method based on interference spectroscopy of the present invention.
[0057] figure 1 It is a schematic diagram of the formation of interference spectrum, and its intensity distribution can be expressed as:
[0058]
[0059] Among them, I s is the spectral intensity profile, I b is the background light intensity, s is the optical path difference, |γ| and φ γ are the magnitude and phase of the complex coherence. According to formula (1), it can be calculated that under the condition of a given spectral range, the number m of fringes that can be received on the array detector can be expressed as:
[0060]
[0061] Among them, λ min is the lower limit of the spectral range, λ max is the upper limit of the spectral range, and the optical path difference can be calculated according to the number of fringes in the interference spectrum.
[0062] Let the wavenumber k=1 / λ, according to ...
Embodiment 3
[0072] Interference fringes are captured by interferometric optical path difference detection and fringe tracking methods based on interference spectroscopy. Figure 5 In the optical path, the delay line A7 scans the optical path within the stroke, and judges whether interference fringes are captured through the image collected by the sCMOS camera 13 .
[0073] figure 2 with image 3 It is the simulation result of the optical path difference detection method in the present invention. When interference occurs, there will be obvious peaks in the frequency spectrum of the interference spectrum except zero frequency.
[0074] Figure 4 It is a schematic diagram of the real-time control algorithm in the present invention. When the optical path difference calculation part program finds that there are obvious peaks except zero frequency in the interference spectrum, it is judged that the interference fringes are captured, and the delay line A7 is controlled to stop scanning the opt...
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