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(12) Patent Application Publication (10) Pub. No.: US 2015/0124336A1 Kaufman (43) Pub

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(12) Patent Application Publication (10) Pub. No.: US 2015/0124336A1 Kaufman (43) Pub US 2015O124336A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2015/0124336A1 Kaufman (43) Pub. Date: May 7, 2015 (54) WIDE SPECTRUM OPTICAL SYSTEMIS AND Publication Classification DEVICESIMPLEMENTING FIRST SURFACE MIRRORS (51) Int. Cl. GO2B I7/08 (2006.01) (71) Applicant: Public Service Solutions, Inc., Fresh GOL 5/50 (2006.01) Meadows, NY (US) GO3B 7/4 (2006.01) GOIN 2L/25 (2006.01) (72) Inventor: Peter N. Kaufman, Fresh Meadows, NY (52) U.S. Cl. (US) CPC .............. G02B 17/08 (2013.01); G0IN 2 1/255 (2013.01); G0IJ 5/505 (2013.01); G03B 17/14 (2013.01); G0IN 220.1/061 13 (2013.01) (21) Appl. No.: 14/315,270 (57) ABSTRACT The present invention generally relates to wide spectrum optical systems and devices for use in multispectral imaging (22) Filed: Jun. 25, 2014 systems and applications and in particular, wide spectrum optical assemblies that are implemented using low cost, first Surface mirrors in an optical framework that enables real-time Related U.S. Application Data viewing of an image in multiple spectral bands simulta (60) Provisional application No. 61/839,356, filed on Jun. neously over the same optical centerline with one main opti 25, 2013. cal element. 1. 42 41 Patent Application Publication May 7, 2015 Sheet 1 of 26 US 201S/O124336A1 : Patent Application Publication May 7, 2015 Sheet 2 of 26 US 2015/0124336A1 FIG. 2C FIG. 2D Patent Application Publication May 7, 2015 Sheet 3 of 26 US 2015/O124336A1 FIG. 3B Patent Application Publication May 7, 2015 Sheet 4 of 26 US 2015/0124336A1 FIG. 3D Patent Application Publication May 7, 2015 Sheet 5 of 26 US 2015/0124336A1 FIG. 4A 1 FIG. 4B 492 Patent Application Publication May 7, 2015 Sheet 6 of 26 US 2015/O124336A1 50 53 M1 51 Mirror(s) Beamsplitter(s) 57 imager(s) (On-Axis) 58 : Image 52 Processing/ E::: : :: Output :Imager(s): Mirror(s) ; N51B Electronics (Off-Axis): Beamsplitter(s) : 59 : 56 : 55 Patent Application Publication May 7, 2015 Sheet 7 of 26 US 201S/O124336A1 F.G. SC : Patent Application Publication May 7, 2015 Sheet 8 of 26 US 201S/O124336A1 . : -vi - Patent Application Publication May 7, 2015 Sheet 9 of 26 US 201S/O124336A1 Patent Application Publication May 7, 2015 Sheet 10 of 26 US 2015/0124336A1 FIG. 8 Patent Application Publication May 7, 2015 Sheet 11 of 26 US 201S/O124336A1 Patent Application Publication May 7, 2015 Sheet 12 of 26 US 201S/O124336A1 Patent Application Publication May 7, 2015 Sheet 13 of 26 US 201S/O124336A1 Xa - 101 2. 7 Patent Application Publication May 7, 2015 Sheet 14 of 26 US 201S/O124336A1 :::: Patent Application Publication May 7, 2015 Sheet 15 of 26 US 201S/O124336A1 Patent Application Publication May 7, 2015 Sheet 16 of 26 US 201S/O124336A1 Patent Application Publication May 7, 2015 Sheet 17 of 26 US 2015/O124336A1 FIG. 15A 15OA 5OB Data Data Detector is to 152A 52B FIG. 15B Patent Application Publication May 7, 2015 Sheet 18 of 26 US 201S/O124336A1 Frvy rary v Pa 11 F a vaar 411 114 e) 10) 62 \s. h2 FIG. 16B Patent Application Publication May 7, 2015 Sheet 19 of 26 US 2015/O124336A1 -S1 FIG. 16E Patent Application Publication May 7, 2015 Sheet 20 of 26 US 201S/O124336A1 Patent Application Publication May 7, 2015 Sheet 21 of 26 US 201S/O124336A1 Patent Application Publication May 7, 2015 Sheet 22 of 26 US 201S/O124336A1 217 21s xxx xx-x-xx-x-x-xd * * * Patent Application Publication May 7, 2015 Sheet 23 of 26 US 201S/O124336A1 Patent Application Publication May 7, 2015 Sheet 24 of 26 US 201S/O124336A1 G. 23 Patent Application Publication May 7, 2015 Sheet 25 of 26 US 201S/O124336A1 243 rC. 20. Patent Application Publication May 7, 2015 Sheet 26 of 26 US 201S/O124336A1 FG. 2s US 2015/O124336A1 May 7, 2015 WIDE SPECTRUM OPTICAL SYSTEMIS AND narrow bandwidth in nature and refractive optics made from DEVICESIMPLEMENTING FIRST SURFACE Such materials are only transparent at wavelengths relative to MIRRORS the material they are made from. These wavelengths seldom coincide exactly with those needed for the desired imaging CROSS-REFERENCE TO RELATED bandwidth, so performance compromises must be made. For APPLICATION wideband operation, very expensive exotic fragile unstable lens materials have to be used and they also require perfor 0001. This application claims priority to U.S. Provisional mance compromises that make then difficult to implement Patent Application Ser. No. 61/839,356, filed on Jun. 25, and use. These materials have to be specially treated using 2013, the disclosure of which is fully incorporated herein by complex processes and coatings to get them to perform as reference. needed, which further contributes to the expense and com plexity in manufacturing. Moreover, the wideband materials TECHNICAL FIELD used to form refractive optics result in lenses that are very 0002 The present invention generally relates to wide fragile, unstable and can be destroyed by Small amounts of spectrum optical systems and devices for use in multispectral moisture or dirt. imaging systems and applications, and in particular, wide 0006 IR energy wavelengths are not focusable thru com spectrum optical assemblies that are implemented using low mon inexpensive materials such as glass or plastic which cost, first Surface mirrors in an optical framework that enables work for UV and visible light wavelengths. TiC's (thermal real-time viewing of an image in multiple spectral bands imaging cameras) and other imagers need to receive as much simultaneously over the same optical centerline with one of the available photonic energy as possible to detect and main optical element. create an image, especially at long distances and low emissive energy levels. The optical elements must pass as much of the BACKGROUND available energy as possible onto the imager's detectors. Loss 0003. In general, conventional imaging systems known in of photonic energy in the optics requires the imagers to be the art implement optical lens assemblies and sensing/detec more sensitive which raises their cost. Reducing the costs for tion technologies for imaging target objects or scenes in thermal imaging camera optics without sacrificing perfor radiation that falls in discrete spectral bands of the electro mance is necessary for TiCs to proliferate into main stream magnetic spectrum, Such as the UV, visible, near IR, and IR use. Having the ability to be truly wide spectrum as well as and far IR (infrared) spectrums, whereby such imaging sys low cost adds the functionality of being usable at other wave tems are designed for optimal operation in one particular lengths with the same lens. spectral band (e.g., visible light). However, for certain appli 0007 Moreover, in applications where images from dif cations, imaging systems are designed for multi-spectral ferent spectral bands are combined or blended, the ability to operation to image radiation in two or more discrete spectral spatially register the different images is problematic when the Sub-bands of the electromagnetic spectrum Such as visible/ images are captured over different optical centerlines and near IR and mid/long wavelength IR bands. Indeed, in certain separate imaging channels. Further, if quantitative scene applications, the ability to image a target scene in the visible measurements are desired, the use of different optics and and IR spectral bands can allow viewing of target objects/ detectors introduces measurement complexities and errors. scenes in normal level lighting conditions as well as low-level light conditions (e.g., dusk, Smoke, bad weather conditions, SUMMARY long distance or objects that are close to background levels or 0008. In general, exemplary embodiments of the invention weak emitters). There are various applications, such as mili include wide spectrum optical systems and devices that are tary applications, where imaging targets of interest over a implemented using first Surface mirrors designed to provide wide range of photonic wavelengths is important or otherwise low loss reflection over a wide spectrum of photonic radia desirable. tion. Exemplary embodiments of the invention include meth 0004. However, systems and devices for multispectral ods for constructing first surface mirrors with reflective coat imaging applications (e.g., imaging in visible and infrared ings made from very wide spectrum Surface materials or portions of the spectrum) are typically complex and costly, narrow spectrum materials and coatings for enhancing optical due to the different optics, image sensors and imaging elec performance and protecting the underlying reflective Surface tronics that are needed for each of the different spectral bands and optical coatings. For example, anti reflection and/or pro of interest. For multispectral applications, the use of refrac tective layers can be formed by sprayed on or vacuum formed tive optics is especially problematic, where refractive optics polymer materials such as polyethylene and polyurethane, are typically designed for specific spectral bands and cannot cyanoacrylate materials such as DVC (deposited vaporized sufficiently provide wideband performance across a wide cyanoacrylate) or DLC (diamond like carbon) materials, spectral range. Consequently, for multispectral applications, which allows low cost fabrication of first surface mirrors with different optics must be used for each spectral band of interest wide spectrum performance. (i.e., the same refractive optics cannot be commonly used 0009. In other exemplary embodiments of the invention, over a wide range of spectral bands). one or more wide spectrum first Surface mirrors (e.g. para 0005 Presently, gemological or mineralogical optic mate bolic, spherical, aspherical and/or flat mirrors) are arranged in rials are used for constructing refractive lenses for thermal “off-axis' and/or "on-axis' configurations for implementing imaging cameras (TiC), where such optics are very expensive low cost front-end optical assemblies providing wide spec because they are made of rare exotic high purity materials like trum performance for various multi-spectral applications.
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