Due to the extreme dependence of our thermal emission behaviour on the wavelength of the heat source due to the extreme dependence of our thermal emission behavior on the wavelength, only certain wavelengths are suitable for measurements of thermal. The following graphs show the thermal transmission range of standard thermal lenses and window substances for infrared thermometers. The blue-colored curve illustrates the general rule applicable to all materials and shows the average value across a temperature interval of zero (black) to infinity (green), which is the cold-pressure limitation (CPL).
The cold-pressure limit, which is used for windows and lenses, is the maximum measured value of a material’s damping coefficient against the thermal gradient. This ratio is plotted as a function of the temperature variation across the angle of view for a specific viewing angle and cte of the lens or window. The bending moment of a system is the variation in angle of incidence from spherical or linear. This makes the slope proportional to this curve. The focal length of an entire system is also a factor in the slope. It can be considered as a function of the focal length divided the period of the curve (i.e. the interval between shots).
The inside surface temperature of the system will always remain within the prescribed curve for a particular temperature and the focal length of a window assembly or lens. This is also referred to as a “curved top”. For instance the curve for the thermal conductivity of a glass beads inside a glass vial having a hole in it can be plotted in relation to the focal length and the temperature difference within the vial between the bottom of the bead and the vial’s surface, and the angle of incidence for a given window assembly. If the aperture is fixed for all shots, then the area between the surface temperature of the system and the curve of variation for the particular window assembly must remain constant. Variable apertures can cause the curve to become curvilinear due to changes in the glass’s temperature used to create the bead and ambient air temperature the focal length, and the time of photography. A signature left by a photographer on flowers is an example of a curving surface.
A window and lens should be mounted in a way that their focal points and lines of sight are properly aligned. If the temperature of the inside of the system is too cold for the lens, then the outside surface temperature of the frame will be lower and the inside of the lens will be too warm. If the temperature outside of the lens and the frame are the same, then the frame will not require any adjustments to compensate for the cooling or heating effects of internal temperature differences. The inside temperature of the system will be correct for a particular focal length without the need for any other adjustments, as long as there is no external source of temperature variations impacts the system. If the system is situated in an area that has limited or obstructed views of the surrounding scenery or buildings it could be necessary to regulate internal temperatures.
The first mechanical interlocking mechanism used to attach camera lenses were made of plastic. This technology was later adapted for use with pinhole glasses. This kind of lens assembly comes with a drawback with the mechanical joints that connect the lens and frame might crack or indent. If this were to happen, happening, it would be required for the entire assembly to be replaced within the shortest amount of time. This is the reason this system has been replaced with more robust designs.
Lenses that are designed to be used with pinhole glasses typically have frames made of metallic and a thin plastic or glass lid. At the very least the lense designs should have a hermetically sealed lens construction. A lens that is hermetically sealed has a sealed surface on the bottom and the top. The top surface may contain an elastomeric seal that is similar to that previously mentioned. It could also contain an lip, adhesive or a layer of plastic film.
A lens surface that is the substrate and is attached to the base is another embodiment of this type window and lens assembly. This system usually consists of a glass casing and a series lens compartments. Other kinds of devices can be integrated into the windows, like thermometers and light emitters. In some cases, the device used to control the temperature in the room could be part of this type of system. In this scenario there are a number of compartments that could be used to house the temperature controller together with a variety of other devices, like an alarm clock or thermostat.
This isn’t a complete listing of all the types of window assemblies and lenses that are available. However, it does provide an indication of the important technologies that are related to this invention. For more information, please see the complete disclosure. In particular, please look over the sections that pertain to “details of the Present Invention” and “Description of the Process With Respect to the Identification of the Various classes of products Involved in the Present Application.”
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