Limited-Projection Laser Tomography of Combined Gasdynamic Flows

Computed Tomography of Chemiluminescence (CTC): Instantaneous 3D measurements and Phantom studies of a turbulent opposed jet flame

“…More recent studies [18][19][20][21][22][23] have considered in situ applications with optical access restrictions and so lower numbers of views. Reconstructions of Refractive Index (RI) measurements have been performed using CT for flow visualisation purposes [24,25] and to provide temperature and density information [26][27][28][29], in some cases in 3D by stacking sections [26,27,17,29]. Computed Tomography has also been used in thermometry [30][31][32][33][34][35][36] based on the emissions of soot or pervasive post-combustion species such as H 2 O. Coupling CT to such natural flame emission measurements removes the need for a light source, which is particularly advantageous for the control applications considered in many studies [37][38][39][40].…”

Characterization of scalar mixing in dense gaseous jets using X-ray computed tomography

“…Optical tomographic methods were first proposed by Stuck (1977) and Byer and Shepp (1979) for determining spatial concentration of air pollutants via tomographic reconstruction of laser absorption data. In the nearly 40 years since, methods such as holographic interferometry (Feng et al 2002;Snyder and Hesselink 1988;Watt and Vest 1990), laser absorption (Bennett and Byer 1984;Lavinskaya et al 2006;Mohamad et al 2006;Santoro and Semerjian 1981;Wright et al 2006), chemiluminescence (Floyd et al 2011), and rainbow Schlieren (Agrawal et al 1997) have all been used in combination with tomographic reconstruction algorithms to yield three-dimensional scalar field data in gas-phase applications.…”

“…The general approach to this problem has been attempting to artificially design optical access ports into experimental and industrial environments with varying levels of success (Mohamad et al 2006;Wright et al 2006). Further, many experimental setups contain equipment that for practical or cost reasons restricts either view number or available view angles, each of which requires the use of limited-view reconstruction algorithms that are not always as accurate as those used in the high-view limit (Elsinga et al 2006;Floyd et al 2011;Lavinskaya et al 2006;Prince and Links 2006). In an ideal case, one would be able to obtain quantitative data for scalar quantities in optically inaccessible gas-phase flow environments without resorting to either of these limited-view techniques.…”