Radiometric techniques for temperature measurements are indispensable in industrial applications, particularly when the use of contact thermometers is hard or impossible to realize. The principles and realizations of some new and extended radiometric techniques for measuring the emissivity and temperature of an object are presented. Using the described techniques, the emissivity and temperature of an Inconel 600 sample at high temperatures in laboratory conditions were determined. The validation of the temperature measurement of the same sample in a simulated industrial condition is also presented.
We propose and demonstrate a novel liquid deformable mirror, based on electrocapillary actuation, for highorder wavefront correction. The device consists of a two-dimensional array of vertically oriented microchannels filled with two immiscible liquids, an aqueous electrolyte, and a viscous dielectric liquid, where the dielectric liquid overfills the top end of the channel and forms a thin layer on top. To remedy the poor reflectivity of pure liquids, a free-floating reflective membrane or a dye-coated liquid can be used. The proposed device offers several advantages for adaptive optics applications. These advantages include a high number of actuators, high stroke dynamic range, low power dissipation, fast response time, an initially flat surface, and low cost. However, the device is mainly suitable for dynamic wavefront correction and is limited by its orientation.
Recently a scanning method for determining the size-of-source effect (SSE) in radiation thermometry was proposed. It was shown that by scanning the radiation thermometer (RT) across a narrow slit with a slit width similar to the spot size of the RT, results comparable to the indirect method can be obtained. However, due to the low signal levels (almost at the noise level) detected by the RT, the method is susceptible to noise. We examine further this scanning method by determining the influence of the relative position of the slit, and slit size on the resulting SSE. We also present a simple model for the radiation propagation relevant to this method. Lastly, we compare the results of the scanning experiments to the conventional direct method for SSE and show that the scanning method is also comparable to the direct method, as long as the parameters of the scanning method (e.g., slit position, slit size) are adjusted properly.
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