Optically absorbent liquids

Application of the Phase Doppler Technique to Optically Absorbent Liquids... 

Application of Phase-Doppler Technique to Optically Absorbent Liquids Table 4 Comparison of phase-Doppler results and photography, (p = 30 ... 

So far the Mie theory seems to be a powerful tool for describing the scattering behaviour of optical absorbent liquid droplets and to select the right parameters of the optical set-up in combination with a correct -d-relation. 

Figure 6. Vibration diagram depicting optical third harmonic generation when an absorbing liquid follows a thin solid. (See text for further discussion.)...

Optical absorbance detection was also achieved using a CCD-based spectrophotometer. Two food dyes (FD C Blue 1 dye and FD C Red 3 dye) were first separated by open-tubular liquid chromatography and then detected on a PDMS chip. The LODs for the blue and red dyes were determined to be 80 pM and 200 pM, respectively [569]. 

Due to their large optical anisotropies, liquid crystals (LCs) have a large optical nonlinearity which is the result of molecular reorientation (Freedericksz transition) in an external field which exceeds the critical field [1], The high external field inhibits the application of LCs, and decreasing the threshold as low as possible is a difficult task [2], LCs doped with a small amount of absorbing dyes that could decrease the needed optical field intensity have been reported [3]. The basic assumption is that the anomalous reorientation of the director results from the interaction between the excited dye molecules and the host. However, this sample would easily degrade under the influence of laser radiation. 

The trapped electron is optically absorbed in the visible part of the spectrum. The spectrum is asymmetric, having a more steep drop on the side of long waves. The similar shape of the absorption band is characteristic of the solvated electrons in the polar liquids. Another feature of the spectrum is large half-width W1/2 of the band. Table II contains some characteristics of the optical absorption band of e tr in the aqueous glasses of electrolytes at 77 °K. Analogous optical bands of e tr in the alkaline and perchlorate glasses are observed in References 6, 8, 10, 18, 41, and 58. 

Nonoptical Noise Sources in High-Performance Liquid Chromatographic Optical Absorbance Detectors... 

Kreuzer M, Marrucd L, Paparo D. 2000. Light induced modification of kinetic molecuclar properties enhancement of optical Kerr effect in absorbing liquids, photoinduced torque and molecular motors in dye doped nematics. J Nonlin Optical Phys Mater 9 157 182. 

EW-based optical absorbers have been designed to exploit EW-induced capillary rise for absorbing undesirable radiations (e.g., X-rays), thereby minimizing unnecessary exposures of patients to radiations in medical diagnostics. Such absorbers can be formed by dissolving heavy salts in the liquid solution that can rise through a capillary or get depressed, on application of suitable actuation voltages [15]. 

Evaluation of the transverse temperature profile ( the thermal lens ) induced by laser radiation passing an absorbing (liquid) medium. Optical detection of organic compounds by the change of refractive index... 

Janossy I, Lloyd AD, Wherrett BS (1990) Anomalous optical Freedericksz transition in an absorbing liquid-crystal. Mol Cryst Liq Ciyst 179 1-12... 

One of the key parameters of a NIR liquid analyzer is the reproducible pathlength. This is pivotal in all optical instruments (spectrophotometers), but the relatively small pathlength — especially above about 1600 nm for more absorbing liquids (aqueous solutions) — renders this parameter critical. 

Phase-Doppler technique applied to an optical absorbent homogeneous liquid... 

It was shown that the phase-Doppler technique is a powerful tool for simultaneous measurements of diameters and velocities of spherical particles in application to optical absorbent homogeneous and inhomogeneous liquids. 

Previous work has shown the nickel dithiolene dye as a desirable candidate for the LCPDl. The nickel dithiolene has a unique aromatic ring structure, which imparts a relatively high infrared absorption and a high thermal and photochemical stability. With 2 alkoxyphenyl substitutions onto the nickel dithiolene core, these complexes possess optical absorbance bands at the desirable wavelength of the laser. However, these alkoxyphenyl substituted compounds have demonstrated limited solubility in the host liquid crystal medium. The potential of an alkyl-phenyl substituents to increase the solubility of the dithiolene dye in the host liquid crystal medium was the primary topic of this investigation. 

Manasse U, Wriedt T, Bauckhage K (1993) Phase Doppler sizing of optically absorbent single- and multicomponent liquid droplets using semiconductor devices. Meas Sci Technol 4 369-377... 

H. Eichler, G. Enterlein, P. Glozbach, J. Munschau, and H. Stahl, Power requirements and resolution of real-time holograms in saturable absorbers and absorbing liquids . Applied Optics 11, pp 372-375,1972. 

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