Abstract: A cabinet device for ventilation equipment includes a self-contained modular unit adapted for mounting in a cutout on a wall or door of a machine room enclosure, typically small, standalone confined structures used for telecommunications and related equipment, often in conjunction with a site structure such as a cell tower or antenna. Weather resistance is provided by a series of baffles, gasketing and directed intake and output conduits, specifically intended to prevent water infiltration. Fans direct airflow through the intake and output conduits for maintaining temperature inside the enclosure through a controlled exchange of ambient air, often in conjunction with native HVAC (Heating, Ventilation and Air Conditioning) equipment when the outside temperature limits the effectiveness of ambient air exchanges. An inwardly hinged panel supports the fans and allows access for air filter access and maintenance, without removal or breach of the weathertight engagement with the enclosure exterior.

Abstract: Systems and methods are described for spatial-heterodyne interferometry for transmission (SHIFT) measurements. An apparatus, includes: a source of coherent light energy; a reference beam subassembly optically coupled to the source of coherent light; an object beam subassembly optically coupled to the source of coherent light; a beamsplitter optically coupled to both the reference beam subassembly and the object beam subassembly; and a pixilated detection device optically coupled to the beamsplitter. The object beam subassembly includes an object that is at least partially translucent, the object transmissively optically coupled between the source of coherent light energy and the beamsplitter.

Abstract: Systems and methods are described for spatial-heterodyne interferometry for reflection and transmission (SHIRT) measurements. A method includes digitally recording a first spatially-heterodyned hologram using a first reference beam and a first object beam; digitally recording a second spatially-heterodyned hologram using a second reference beam and a second object beam; Fourier analyzing the digitally recorded first spatially-heterodyned hologram to define a first analyzed image; Fourier analyzing the digitally recorded second spatially-heterodyned hologram to define a second analyzed image; digitally filtering the first analyzed image to define a first result; and digitally filtering the second analyzed image to define a second result; performing a first inverse Fourier transform on the first result, and performing a second inverse Fourier transform on the second result.

Abstract: Systems and methods are described for spatial-heterodyne interferometry for transmission (SHIFT) measurements. A method includes digitally recording a spatially-heterodyned hologram including spatial heterodyne fringes for Fourier analysis using a reference beam, and an object beam that is transmitted through an object that is at least partially translucent; Fourier analyzing the digitally recorded spatially-heterodyned hologram, by shifting an original origin of the digitally recorded spatially-heterodyned hologram to sit on top of a spatial-heterodyne carrier frequency defined by an angle between the reference beam and the object beam, to define an analyzed image; digitally filtering the analyzed image to cut off signals around the original origin to define a result; and performing an inverse Fourier transform on the result.