# Lens and Window Secrets

Because of the dependence of our thermal emission behavior upon the thermal wavelength due to the dependence of our thermal emission behavior on the wavelength, only a few wavelength ranges are suitable for thermal measurements. The following figures reveal the thermal transmission range of common thermal lenses and window materials for infrared thermometers. The blue-colored curve is the general rule for all materials. It is the average value over a temperature range of zero (black) to infinity (green) and is the cold-pressure limit, (CPL).

The cold-pressure limit, which is used for lenses and windows, is the maximum measured value of a material’s damping coefficient against the thermal gradient. This ratio is calculated as a function of the temperature difference in relation to the angle of view for a specific viewing angle and the cte of the lens or window. The slope of this curve is proportional to the bending angle of an entire system, which is the result when the angle of incidence shifts from spherical to linear. The slope of this curve is also proportional to the focal length of a system, which is considered as an expression of the focal length divided by the duration of the curve (i.e., the time between shots).

The inside temperature of the system will be within the prescribed curve for the given temperature and the focal length of the window assembly or lens. This is also referred to as a “curved top”. The thermal conductance curve of a glass beads within a glass vial can be plotted as a function of the focal length as well as the temperature difference between the bottom of the vial and its surface and the angle of incidence of a given window. If the aperture is fixed for all shots, then the space between the inside surface temperature of the system and the curve of variation for that particular window assembly should always remain constant. If the aperture is adjustable, then the curve may be curved as a result of the variation in the temperature of the glass used to make the bead as well as the temperature of the ambient air that is circulating on the inner surface of the vial, and the focal length as well as the duration of shooting. A signature left by an artist on a flower is an example of a curved surface.

The process of mounting a lens and window should be done in a way that their focal points, and lines of view, are in the correct direction. If the inside surface temperature of the system is too cool for the lens, then the outside surface temperature of the frame will be lower and the interior temperature of the lens will be too warm. The frame won’t need to be adjusted in order to compensate for internal temperature fluctuations or cooling effects. If there are no temperature differences from outside, the system’s inside surface temperature will be the same for a given focal length. However, if the system is installed in a location with an obstruction or limited view of any surrounding scenery or building, then internal temperatures may require adjusting.

The first mechanical interlocking systems that were used to attach lenses to cameras were made of plastic or other materials that could be able to bend or form in response to changes in mounting pressure. This design was later adopted to work with pinhole glasses. The issue with this kind of lens assembly is that the mechanical joints between the frame and lens could indent or even break. If this were to happen, happening, it would be required for the entire assembly to be replaced in a short time. This is why this system is being replaced with more durable models.

Pinhole glasses lenses are generally constructed using a frame of metal and a thin, plastic or glass lid. At the very least the lense designs should be sealed with a hermetically-sealed lens construction. A hermetically sealed lens construction contains a sealed surface along the top and bottom of the lens assembly. The top layer could have a similar mechanical seal similar to that mentioned earlier. It could also contain an lip, adhesive, or layer of plastic film.

A lens surface that contains an adhesive and is bonded to the base is an additional illustration of this kind of lens and window assembly. This kind of system usually consists of a casing for windows and a series of compartments for the lens. The windows may also contain other kinds of devices, like light emitters, or thermometers. This type of system could also include a thermostat or light emitter which controls the temperature of the room. In that case the system would comprise of compartments that could house the temperature controller along with a number of other devices, such as an alarm clock or thermostat.

This isn’t a complete list of all the kinds of window assemblies and lenses that are available. It’s a good indication of the most important technologies that are related to this invention. Please refer to the complete disclosure for more information. Refer to the sections on “details regarding the present invention” and “Description of the Method with Respect To the Identification of the Different Classes of Products which are involved in the Present Application.”

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