Tomographic imaging of fluid flows by the use of two-tone frequency-modulation spectroscopy.

High-resolution absorption measurements by use of two-tone frequency-modulation spectroscopy with diode lasers.

The capability of two-tone frequency-modulation spectroscopy (TTFMS) in deriving spectral line-shape information was investigated. Two oxygen A-band transitions at 760 nm were selected, and the Voigt profile and two different collisionally narrowed line profiles were employed in their analysis. By means of a least-squares fitting procedure, we obtained accurate information regarding transition ...

تابع توزیع سه بعدی دمای لیزر القاییده در طیف نمایی جابجایی گرما نوری

  In this paper we present a detailed theoretical treatment of the 3-D temperature distribution induced by laser beam in photothermal displacement spectroscopy. We assume that a solid sample, which is deposited on a substrate and is in contact with a fluid, is irradiated by an intensity modulated cw laser source. By using a technique based on Greens function and integral transformations we find...

Radio Tomographic Imaging-Based Fall Detection

Amongst older adults, falls at home can be deadly. Fall detection systems are an important tool to quickly summon help in the event of a fall. Wearable devices such as help buttons have been a popular approach to the problem; however, studies show that they have a low efficacy in the event of a fall because they require the user to actively remember to use the device. In response to this issue,...

Computed tomographic anatomy of the abdominal region of cat

The purpose of this study was to identify the anatomic structures of the abdominal region of cat throughcomputed tomography (CT) to be used by veterinary radiologists, clinicians and surgeons. The abdominalregion of four cats were scanned twice, with and without using contrast medium in a same position, usinghigh-resolution imaging protocol. Slice intervals were 11 mm and were adjusted so that ...

A tomographic technique for the simultaneous imaging of temperature, chemical species, and pressure in reactive flows using absorption spectroscopy with frequency- agile lasers