Recent content by Gleb1964

The absolute values of irradiance on your graph is applicable only to a enough large volume of plasma which absorb as a Black Body. Small volume would be transparent and have much much less emissivity.

For example, FLIR: Infrared Camera Accuracy and Uncertainty in Plain Language Infrared cameras are typically calibrated using multiple blackbody sources at different temperatures. The camera is mounted on a rotating platform and sequentially pointed at these reference sources.

It's quite simple: if the source's angular size is below the resolution limit, it becomes diluted into the point spread function. If the object's angular size is unknown, its temperature cannot be determined.

It is impossible to use Stefan's law for unresolved source.

In Köhler-type illumination Stop and Field apertures are exchanging between each other between two options, when taking light source or film as an object. The image also different for those two cases. Non-sequential mode is free of that "stop" and "field" conditions, but sequential mode is more...

Lens magnification depends on the distance to your eye, viewing though the lens. If lens (thin lens) coincide with eye, its angular magnification is 1x. If you increase distance between lens and eye, the angular magnification would increase until infinity when eye coincide with the point of...

May be this picture helps. Think about Lens 2 as a microscope looking at DMD pixels. Its resolution would be defined by the numerical aperture of Lens 2 in the object space (at DMD object), meaning how width angle of diffracted from DMD object would be accepted by lens 2 and consecutive optics...

Not correct. Diffraction limitation of the illumination beam is not connected to the DMD pixel size and it resolution. The size of illumination beam is only defining the size of illuminated area at DMD. The resolution of the DMD projection is defined by the size of field aperture located at...

Apart from cloud reflectance, there is a significant path within the atmosphere where water vapor efficiently absorbs signals at 940 nm.

Isn't 940nm close to the water absorption peak?

Only one point (or line) of detector would fulfil null, but not the other area of extended detector.

"MLA"- Micro Lens Array I suppose.

For a single spherical mirror, the stop can be placed: At the center of curvature, resulting in an aplanatic design. At the focal distance, resulting in telecentricity. At the mirror, as many telescope designs do. Somewhere else, aiming to trade off the above properties. It is up to the...

The problem is that Zemax doesn't know where you intend to set the stop. For example, you have just a spherical mirror (or lens). Where Zemax should place a stop? Zemax cannot define it itself.

Whilst for some optical systems the position of the stop is well established, it is beneficial to provide optical designers with the freedom to choose the stop position freely. This is particularly important when combining many optical components into one system with multiple apertures. In...