Remote probing

Fig. 2.6.5 Hardware for high field NMR remote probe in (c) contains a relatively large saddle-detection. Photographs (a) and (b) show la- coil and is used for (flow) imaging. The detec-boratory-built remote detection probes with tor probe in (d) contains a microsolenoid coil both rf coils built into the same body (c), (d) for optimized mass sensitivity, which is parti-and (e) are detector-only remote probes that cularly useful for microfluidic NMR applica-can be inserted from the top or bottom into the tions. The same probe is shown in (e) with a NMR imaging assembly, so that the well mounted holder for a microfluidic chip that is...

Sampling mode effects The goal was to be able to measure at-line, with no sample preparation at all, using a fiber-optic probe or a remote sampling head. However, the area sampled by the hber-optic probe is much smaller than for the sample transport module. It was found that the remote (probe) spectra were very similar to the static (sample transport) spectra, but the baselines were shifted significantly higher and the absorbance peaks consequently reduced in intensity as before, the characteristic peak positions were not affected. Calibration models developed using spectra obtained with the hber-optic probe performed equivalently to those developed with the sample transport module. 

Sampling method/sampler Laminar airflow Critical 1-6 environments Production areas 1-6 General areas 1-6 Flat Irregular environmental environ, surfaces surfaces Personnel barriers Volumetric 1-6 (SP) Y/N Remote probe possible External power Sample... 

Fig. 14.17). The advantage of a surface analysis technique for this application is obvious. It is easier to examine the surface with a remote probe (X-rays) than to devise a way of having an unmanned spacecraft take a sample for an analytical method that requires elaborate sample preparation. 

In the case of oversized samples (e.g., works of art), substrates with unusual shapes or difficult to get at samples such as board components or recessed sample areas, coatings can be remotely probed using a fiber-optic interface that directs the light from the source into a sampling probe head and thereafter collects the transmitted light into the detector of an IR spectrometer. The probe head (a mini-turized ATR element or a reflectance probe with actual sample interface areas as... 

Figure 4.22 (a) Hollow wave guide schematic and (b) mid-IR FlexIR with remote probes. 

Thermoelectrometry comprises methods for the measurement of resistance or capacitance during heating. Some equipment in this category provides remote probes for in situ monitoring of the curing of thermosets. 

Use of cheap, high efficiency fibre optics (remote probing, 100 m)... 

T. F. Cooney, H. T. Skinner and S. M. Angel, Comparative study of some fibre-optic remote probe designs. 1. Model for liquids and transparent solids, Appl. Spectrosc., 1996, 50, 836-848. 

Another attachment that can be effected to a Raman spectrometer is a remote probe. This consists of a fibre optic cable that passes the laser beam to a sample outside the conventional sampling chamber. This can be of use in many different applications, the most obvious of which is where the sample is too large or complex to fit into the instrument. In vivo biological studies utilize a fibre optic probe for the investigation of human tissue. Industrial process monitoring uses a Raman spectroscopic probe for online quality control during manufacture. 

Wark, D. Q. Hilleary, D. T. (1969). Atmospheric temperature successful test of remote probing. Science, 165, 1256-8. 

Fig. 5.13. Diagram of a Raman spectrometer with a fiber-optic remote probe. (Source Ref. [43].)...

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