Keo Sentry


Keo Scientific designs and manufactures highly sensitive all-sky and narrow-field multi-spectral (wavelength-resolved) imagers for low-light-level airglow (nightglow) studies. Several options are available: single-filter and filter-wheel based instruments, with fields of views ranging from 1 to 180 degrees. VIS, NIR and IR optimized imaging at speeds as fast as f/0.7, onto a wide selection of different thermoelectrically deep-cooled CCDs. Anti-etaloning technologies are used to avoid fringing-effects in the near-infrared. Our highly sensitive imagers are employed in the study of airglow, plasma bubbles, tracking of meteors, upper-atmospheric lightning (sprites), noctilucent clouds and more.   ▶ More information here.

Keo Sentry MTM


Keo Scientific is pleased to present to the community a short-wave infrared (SWIR) imager that measures emission lines of mesospheric OH at around 1.5 μm. Such data can be used to create intensity and temperature maps of the Mesosphere at ~87 km. Wave propagation/dissipation may be measured also in the presence of strong aurora or under the full moon. All-sky data are obtained at high spatial and temporal resolution. The instrument design, which involved the creation of an unprecedented F1.0 SWIR fisheye lens optical system for a large-format, deep-cooled (-85°C) InGaAs sensor, is inspired by Dr. Mike Taylor's highly successful Advanced Mesospheric Temperature Mapper (AMTM). The instrument is in stock and shipping as of May 2021.

Fabry Pérot Interferometer (FPI)


Keo Scientific designs and manufactures a range of Fabry-Pérot Interferometers (FPIs). Both all-sky and scanning Fabry-Pérot interferometers are available for observations of winds and two-dimensional atmospheric parameters in the thermosphere and the mesosphere region by the measurement of Doppler shift and broadening of airglow emission lines.

▶ Additional details here.



Keo Scientific designs and manufactures a wide range of highly sensitive photometers built around low-noise deep-cooled photomultiplier tubes (PMTs) as well as other more recent photon-counting sensor technologies. Leveraging almost 40 years of actual field experience, we go beyond textbook optics' knowledge and design photometers ideally suited to deal with the many non-obvious issues and problems associated with measuring weak airglow in the presence of continuum sky backgrund. Single-filter, filter-wheel based, and multi-filter beam-split options are available for staring-mode as well as meridian-scanning operations.

▶ More information here.



Keo Scientific Ltd. has proudly teamed up with what is arguably the world-leading expert on spectrograph design for airglow research, Jeffrey Baumgardner of Boston University. We are thus in a position to design and build the highest-quality spectrographs, whether grating- and grism-based, uniquely suited to your particular atmospheric and ionospheric research needs. Please contact us with your specific sensitivity, spectral coverage and resolution requirements.

Keo SkyScan


Keo Scientific designs and manufactures articulated first-surface mirror assemblies (periscopes) with a variety of aperture sizes. Ideal for use with narrow field imagers, photometers and Fabry-Pérot Interferometers (FPIs), or as a Heliostat.

▶ Additional details are on the SkyScan page.

Low Brightness Sources


Keo Scientific designs and builds portable low brightness light-sources suitable for use in airglow research. Manual and remote-controlled units are available (calibrated, as well as uncalibrated).

▶ More details here.

Keo BK-7 Glass Dome


Our custom 9.25” diameter hemispheric observing dome is made of BK-7 grade mineral glass which is finely ground and coated to the highest standard of precision. The geometry and size of this dome is meant to accommodate the ultra-wide field of view fisheye lenses of all Keo Scientific allsky imagers, without obscuring parts of the field of view. The dome will also accommodate optional accessories, such as the Keo SunShield (below).

▶ See this brochure for additional details on this high-transmission observing dome.



The Keo SunShield is a clamshell-type front shutter which serves to protect the primary lens of your Keo imager from exposure to solar radiation during daytime. The clamshell fully retracts when open, leaving the all-sky (fish-eye) field of view unobscured.

▶ See this brochure for additional details.



A riometer (relative ionospheric opacity meter) is an instrument used to quantify the amount of electromagnetic wave ionospheric absorption in the atmosphere. As the name implies, a riometer measures the "opacity" of the ionosphere to radio noise emanating from distant stars and galaxies. In the absence of any ionospheric absorption, this radio noise, averaged over a sufficiently long period of time, forms a quiet-day curve. Increased ionization in the ionosphere will cause absorption of radio signals (both terrestrial and extraterrestrial), and a departure from the quiet-day curve. The difference between the quiet-day curve and the riometer signal is an indicator of the amount of absorption, and is measured in decibels. The Riometer was developed in the mid 1950s by scientists at the University of Alaska who were researching the radio propagation effects of aurora. Five years in the making, Keo Scientific's new riometer may be considered a 'next-generation' riometer.

▶ See this page, or email us for additional details.



We provide full absolute spectral calibration and imager characterization services using our NIST traceable in-house integrating sphere, custom-built and calibrated especially for the extremely low light-levels encountered in atmospheric and ionospheric research.

▶ More information in this informational brochure.

Keo Synopticx Software


KeoSynopticx provides an easy to use imager control interface for automated imaging operations. It enables the synchronization of filter selection, CCD/exposure settings and shutter operation through a Graphical User Interface.

▶ Download the User's Manual here.