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Thermalinfraredwavelength

Functions of the light-absorbing and photo-thermal conversion realized by Sumitomo Metal Mining’s transparent materials can be applied to various fields.

As in all high-performance optical systems elimination of stray light is cardinal for SWIR system performance. This is especially important for systems operating in the SWIR regions because of the low intensity of the radiation to be collected and processed.

Long-waveinfrared

In other words, SOLAMENT™ is not only near-infrared absorption materials but also excellent transparent photo-thermal conversion material.

Fig. 1shows the change of the water temperature when a water dispersion liquid of each fine particle is heated by artificial sunlight.

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SWIR light is a reflective light, bouncing off objects a lot like visible light. Due to its reflective nature, SWIR light has shadows and contrast in its imagery. Visible images in resolution and detail are comparable to images from an InGaAs camera- but SWIR are not in color. Some of the tactical advantages of the SWIR are easily recognizable objects and individual identification.

Since Sumitomo Metal Mining’s SOLAMENT™ strongly absorbs the near-infrared rays in sunlight and convert them into heat, it shows a remarkable effect of water temperature rise even in the high transmittance range to warm up the transparent water.

SWIR sensor

Feb 17, 2021 — The magnification of a lens is defined as the ratio of the height of an image to the height of an object. It is also given in terms of image ...

Only the recent development of InGaAs sensors made the sensing of SWIR range (wavelength from 0.9 to 1.7 microns) practical. On top of single point light sensing diodes, InGaAs technology also produces one-dimensional linear arrays and two-dimensional focal plane array cameras. But why should we use SWIR?

Halogen lamps have a conversion efficiency of around 90% for all electromagnetic waves, including infrared rays, and are a very efficient heating means, so they also contribute greatly to reducing the global environmental burden.

We prepared four kinds of water dispersion liquid in which different near-infrared absorption nano particles were dispersed. Then, we measured temperature rise of the water dispersion liquid when it was irradiated with artificial sunlight for 20 miniutes.　As the standard datum, we measured  temperature rise of pure water in the same condition.　At last, we calculated the contribution of each particle to temperature rise from the difference of temperature rise between water dispersion liquid and pure water.

Short wave infraredcamera

Sep 21, 2020 — Engineers at MIT & UMass Lowell have created a completely flat 1mm thick fisheye lens.

Short Wave infraredvs nearinfrared

SOLAMENT™ is considered to be highly compatible with halogen lamps, because radiators at 3000K to 3300K which is equivalent to halogen lamps mainly emit near-infrared lights.

Oct 22, 2024 — It is common practice to test the optical properties of photomultiplier tubes (PMTs) by illuminating the entire photocathode region from the ...

In order to understand, we need to know a basic fact: light in SWIR band is invisible to the human eye. The visibility spectrum extends only from wavelengths of 0.4 microns (blue, nearly ultraviolet to the eye) to 0.7 microns (deep red). Any wavelengths longer than the visible ones can only be seen by sensors such as InGaAs. However, despite its invisibility to the eye, the light in SWIR region interacts with objects similarly to visible wavelengths.

Short Wave Infraredsensor

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Another major benefit of SWIR imaging, unmatched by other technologies, is the ability of image through glass. Cameras use conventional, cost-effective visible camera lenses for all, except the most demanding applications, In SWIR cameras, environmentally hardened housings and special expensive lensing are largely unnecessary- enabling them for a vast variety of industries and applications. This also allows SWIR cameras to be mounted inside protective windows, to provide extra flexibility whenever the camera system is positioned on a potential platform.

Are there other cameras operating in SWIR range? Indeed, sensors constructed from materials like mercury cadmium telluride (HgCdTe) or indium antimonite (InSb) are often very sensitive in the SWIR band. However, these cameras must be mechanically cooled, often to extremely low temperatures, in order to increase their signal-to-noise ratio to usable levels. Cooling is no problem in large military aircraft designed for surveillance and reconnaissance, since these platforms are designed with plenty of space and power to run mechanical cooling systems. Alternatively, similar sensitivity can be achieved with an InGaAs camera at room temperatures.

Laser Power Meters Portable Laser Power Meter; 400-1100 nm, calibrated to 532 nm, max 40 mW; Wide optical power measurement range; Silicon photodiode ...

*SOLAMENT™ is a material technology brand made from CWO™, nanoscale particles that have the unique ability to absorb NIR, invented by Sumitomo Metal Mining Co., Ltd. These and covered by patents and trademarks in both Japan and internationally.

The depth of field varies inversely with magnification just as the width does--- the magnification increases, the depth of field decreases, and vice verse. The ...

SWIR wavelength range

InGaAs sensors are extremely sensitive, literally counting individual photons. Therefore, when built as sensor pixels, or focal plane arrays including thousands or millions of tiny point sensors, SWIR cameras can work in the darkest conditions. For instance, night vision goggles (that exists for several decades) operate by the sensing an amplification of reflected visible starlight  or alternative ambient light, in image intensification (I-Squared) tubes- a technology that succeeded for direct view night vision goggles. However, there’s no practical method without the introduction of reliability and sensitivity limitations when an image needs to be sent to a remote location (for example, an intelligence center). They are inherently suitable for standard storage or transmission techniques, because all SUI’s SWIR sensors convert light to electrical signals.

Black light absorbing coatings are critically important in the SWIR region in this context where Acktar best-in-the-industry coatings excel and exhibit unique light absorbing capability.

However, colorless, transparent, white or fluorescent objects are considered to be very inefficient to heat with sunlight because they transmit or reflect light.

The field of view is often highly restricted, and the front lens element of the objective is placed close to the specimen with which it must lie in optical ...

InGaAs cameras are essential since they can be small, use very little power, yet give big results. Since they’re sensitive to the light used in long distance fiber optics communications (usually around 1500 nm), early applications in the telecom industry were used by InGaAs. Telecom still uses InGaAs diodes and arrays, often in Optical Power Monitors that employ spectrometers operating in the SWIR band. Interesting capabilities surprisingly resulted from this combination. Covertly illuminating a scene viewed only with SWIR cameras becomes possible by using SWIR illumation like 1.55 micron lasers or LEDs. An example of the great value of SUI InGaAs cameras is a military truck able to temporarily illuminate its path when nightglow is not available (for instance, inside a tunnel or a road under thick tree branches)- to safely navigate a route in hostile territory. There are few restrictions on how such illuminators are used, since they’re eye-safe.

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Accordingly, we thought that if we should use a material that absorbs only invisible near-infrared light and converts it into heat, we could heat even colorless, transparent, white, or fluorescent objects.

Short Wave infraredwavelength

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The use of SWIR at night has additional major advantage. The atmospheric phenomenon known as night sky radiance emits 5 to 7 time more illumination than starlight, almost entirely in SWIR wavelengths. “Seeing” objects with great clarity on moonless nights and sharing these images across networks is enabled with a SWIR camera and night radiance (AKA nightglow) unlike other imaging device does.