On the other hand, projectors have also played important roles in visual sensing appli­cations; projector–camera systems, which project a reference image onto the target surface and then capture it, can efficiently acquire much spatial infor­mation without using markers. Nevertheless, this type of sensing has not been used for DPM because no existing device has ever met the demands. That is, no device can handle display and sensing simul­taneously with high perfor­mance and without them interfering with each other.

Converginglens

Fortunately, things might soon change on this front thanks to the new type of projector recently developed by a team led by Yoshi­hiro Wata­nabe at Tokyo Institute of Technology (Tokyo Tech), Takeshi Yuasa at Tokyo Electron Device Limited, Uwe Lippmann at Fraunhofer Institute for Applied Optics and Precision Engineering, and Petra Aswendt at ViALUX. This projector can simul­taneously project visible RGB and invisible infrared (IR) images at a high frame rate of 925 fps. “Using our projector, we can construct a system that can sense its target surface using invisible wavelengths based on a projector–camera confi­guration which is a long-established computer-vision technology,” explains Watanabe, “at the same time, the system can adaptively mani­pulate the images to display in visible wavelengths based on its sensing results.”

Modern projectors and related techniques, such as projection mapping, allow us to visually augment surfaces, opening up vast possi­bilities for amusement attractions, concerts, stages, digital signage, task assistance, and more. In many of these appli­cations, the projection target is not just limited to a flat, white, and static screen; the projected image has to be controlled in real time to match the surface of complex moving targets and make their augmented appearance more con­vincing. Techniques used for such purposes are referred to as dynamic projection mapping (DPM) and have gathered much attention over the past few years.

1. Frequently Used for Beam Focusing Applications 2. Minimizes the Increase in Spherical Aberrations for Multi-Element Systems

Opticallens

At the core of this projector lie two DLP (Digital Light Processing) digital micro­mirror devices, which can handle 24-bit RBG and 8-bit IR images simul­taneously and independently. The team also developed a novel optical engine to align the images coaxially with excellent precision while allowing for a compact confi­guration capable of high-power projection. The developed projector has a unique optics engine and two digital micro­mirror devices that enable it to project RGB and IR images with excellent alignment accuracy.

Digital tools or software can ease your life as a photonics professional by either helping you with your system design or during the manufacturing process or when purchasing components. Check out our compilation:

Positive meniscus lenses is convex-concave lens thicker at the center than at the edges, which frequently used for beam focusing applications.

Negative meniscus lenses is convex-concave lens thinner at the center than edges, which frequently used for beam expanding applications.

Positive lensvs negativelens

1. Frequently Used for Beam Expanding Applications 2. Minimizes the Increase in Spherical Aberrations for Multi-Element Systems

They rely on visual sensing methods to detect the target surface and require high speed, both in sensing and projection frame rate, to properly merge the projected image and its target without noticeable mis­alignment. Unfor­tunately, conven­tional DPM has limited uses because it either needs markers attached to the target or has to be restricted to a single plane to meet the high speed requirements. Recently developed projection mapping techniques can achieve a very realistic appearance, even in dynamic scenes. However, they suffer from critical limi­tations, such as the need for markers on moving pro­jection targets.

Positive lensimage

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Titanium-doped Sapphire（Ti3+:Al2O3）crystals combine supreme physical and optical properties with broadest lasing range which is most widely used crystal for wavelength tunable lasers.

Right Angle Prism is deviating or deflecting a beam of light with 90°or 180°. It is often used in telescope, periscope and other optical system. Deviate Beam or Image by 90° or 180° Material: N-BK7, UV Fused Silica, CaF2, ZnSe, or Ge AR-Coated, HR coated are Available

Link: Fraunhofer Institute for Applied Optics and Precision Engineering, Munich, Germany • Watanabe Lab, Tokyo Institute of Technology, Tokyo, Japan

Achromatic Waveplate Achromatic Waveplates(Retarders), AWP is composed of one piece of Crystal Quartz and one piece of Magnesium Fluoride, MgF2.

Positive lensfor myopia

Dove Prism has two applications. 1. The main application is used as a rotator. 2. Another application is used as a retroreflector.

Elliptical Shape Mirrors Made of by Fused Silica or N-BK7 Coated by Dielectric coating or metal (Al, Au, Ag)coating Shape could be customized

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3).It's a negative uniaxial crystal and mostly used as visible and near IR polarizers. It has high birefringence, wide spectral transmission and availability in reasonably sized rhombs.

Eyelens

As a first appli­cation case, the team plans to introduce their novel projector for a new type of DPM system, which will be capable of mani­pulating the appearance of the entire scene based on the sensed shape in a markerless way. “Conven­tional DPM approaches are limited in that they can only augment the appearance of targets with markers,” states Watanabe, “The new type of mapping enabled by our projector will hopefully extend the fields of application of DPM.” Moreover, while only IR projection will be used for shape sensing in their first project, a projector–camera confi­guration using the entire system could be designed to acquire deeper spatial and physical infor­mation, thereby greatly enhancing projection mapping. (Source: Tokyo Tech)

Typical Sizes Item No. Φ(mm) f(mm) R1(mm) R2(mm) Tc(mm) Te(mm) Fb(mm) Material N-BK7 MNP201 25.4 100 33.42 89.95 4 2.39 96.01 MNP202 25.4 150 42.36 89.95 4 2.95 145.2 MNP203 25.4 200 48.75 89.95 3.5 2.72 194.51 MNP204 25.4 250 83.95 235.5 3.5 2.88 245.97 MNP205 25.4 300 94.19 235.5 3.5 2.98 296.27 MNP206 25.4 400 110.92 235.5 3.5 3.11 396.06 MNP207 25.4 500 124.17 235.5 3.5 3.19 496.16 MNP208 25.4 1000 278.34 600 3.5 3.3 993.7 MNN201 25.4 -100 89.95 32.51 3 4.68 -98.79 MNN202 25.4 -150 89.95 41.21 3 4.11 -148.06 MNN203 25.4 -200 89.95 47.64 3 3.82 -197.82 MNN204 25.4 -250 235.5 83.18 3.5 4.13 -248.62 MNN205 25.4 -300 235.5 93.33 3.5 4.03 -299.04 MNN206 25.4 -400 235.5 109.65 3.5 3.9 -397.33 MNN207 25.4 -500 235.5 122.74 3.5 3.82 -496.94 MNN208 25.4 -1000 600 277.16 3 3.1 -995.3

Positive lensmeaning

Negative meniscus lenses is convex-concave lens thinner at the center than edges. They increase the divergence of the beam without introducing any significant spherical aberration. When used in combination with another lens, they will increase the focal length, and decrease the NA of the system.

Convexlens

Note for Spherical Lens: a. Other optical glass materials from Schott, Ohara, Hoya or Chinese CDGM, UVFS from Heraeus, Corning, Germanium, Silicon, ZnSe, ZnS, CaF2, Sapphire are also available upon request . b. Custom-made Spherical Lenses at any size from diameter 1.0 to 300mm are available upon request.

An international business–academia colla­boration has yielded a new type of projector that can project RGB and invisible infrared images simul­taneously and independently at a high speed of almost 1,000 fps. With its high image alignment accuracy enabled by a custom optics engine, this projector will help closely integrate invi­sible sensing and visible display for a wide range of novel appli­cations, such as dynamic projection mapping.

Positive meniscus lenses is convex-concave lens thicker at the center than at the edges. They are used to minimize spherical aberration. When used in combination with another lens, it’s will shorten the focal length, and increase the NA of system.

MgF2 windows are used in the UV, visible and IR ranges, with approximately 94% transmission from 200 - 1000 nm, and approximately 95% transmission from 1-6µm

Material: Grade A optical glass or Fused Silica Dimension Tolerance: ±0.1mm(Standard), ±0.05mm(High Precision) Center Thickness Tolerance: ±0.1mm(Standard), ±0.05mm(High Precision) Paraxial Focal Length: ±2% Surface quality: 60/40(Standard), 20/10(High Precision) Clear Aperture: >85% Surface Figure: λ/2(Standard), λ/4(High Precision) @633nm Centration: 3 arc minutes Bevel: <0.25mm×45° Coating: Upon requirement

Made from BK7 material, which has transparent range from 330-2100nm. The refractive index is 1.5168 at 587.6nm. The BK7 window has good performance over visible and near IR spectrum for most application.

Pyramid prisms has a base that is connected to a single vertex, not in the same plane as the base, by line segments from each vertex of the base shape.

Reference: U. Lippmann et al.: High-Speed RGB+IR Projector based on Coaxial Optical Design with Two Digital Mirror Devices, PRJ2-4L, 28th International Display Workshops, December 2021

CaF2 has transparent range from 170-7800nm. The refractive index is 1.399 at 5000nm. 1. Low absorption coefficient 2. High damage threshold, 3. Low Dispersion (with an Abbe Number of 95) 4. Low fluorescence 5. Excellent water, chemical, and heat resistance