Detection methods/detectors simultaneously employed

At 10Hz in a typical Nd-YAG laser 1000Hz/- /Hz, and the typical finesse asymmetry is of the order of one percent. In order to detect a gw signal the laser frequency noise has to be lowered by six orders of magnitudes (compared to the noise of a free running laser), and the two arms made as identical as possible. In order to achieve this complex frequency stabilization methods are employed in all interferometric detectors, and in order to insure the perfect symmetry of the interferometer, all pairs of Virgo optical components are coated during the same run (both Fabry-Perot input mirrors then both end mirrors are coated simultaneously). 

Conductivity detection performed with a contactless conductivity detector through the packed bed was shown to be a more versatile and sensitive method than indirect UV detection [77]. Chen et al. employed inductively couple plasma mass spectrometry (ICP MS) as a detection tool for the simultaneous analysis of various ionic species of arsenic, chromium, and selenium [79]. The separation was achieved on an OT CEC column prepared by bonding a macrocyclic polyamine medium on the walls of the capillary. 

In recent times HPLC appears to have become the method of choice for the assay of thiopental. As detailed in Table 5 all the methods have employed reversed phase columns and ultraviolet detection. The variation in mobile phases and detector wavelength has been primarily to enable determination in different body matrices or to permit the simultaneous determination of thiopental and either its metabolites or another drug. For example, particular attention has been paid to the simultaneous measurement of thiopental and its active metabolite, pentobarbital [26,31,42,44,48]. 

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