Probe mounting

When designing a system for thrust bearing proteetion, it is neeessary to monitor small ehanges in rotor axial movement equal to oil film thiekness. Probe system aeeuraey and probe mounting must be earefully analyzed to minimize temperature drift. Drift from temperature ehanges ean be unae-eeptably high. 

An ultrasonic transducer is installed on the pH probe mount in the acid-alkali treatment module [T-31], This prevents fouling of the electrodes and provides a more closely controlled pH in the effluent discharged to the precipitator. 

Bead thermistors are formed by placing two wires, commonly of platinum, in dose proximity and paralld to each other and bridging them with a drop of slurry, which is then sintered into a hard bead and encapsulated in protective glass. Such thermistors are quite stable, approaching, over narrow temperature limits, the stability of industrial metallic thermometers. However, the resistance tolerance may vary from unit to unit by as much as 20%, and matching or interchangeability is usually achieved by selection. Beads can be made quite small, which may allow application in, eg, temperature probes mounted in intravenous needles. 

In all of these tests, the specimens, 75 mm square and up to 25 mm thick, are exposed to radiant heat with and without a pilot flame(s). Decomposition takes place inside a closed cabinet of 0.51 m3. There is no control of the air flow or oxygen concentration through the fire zone and the effluent is mixed by natural convection, as it accumulates within the closed cabinet. Gases are sampled using probes mounted in the center of the cabinet. 

Figure 11 Description of dual microcoil probe. (A) Two coils wrapped around a polyimide sleeve (B) Dual-coil probe mounted on top of the probe head. (C) Schematic of balanced tank circuit used for each microcoil. Coil (L), series capacitors (Cs) 3.3 pF, tuning capacitors (CT) 0.6-4.5 pF, matching capacitor (CM) 0.6-4.5 pF, bridge capacitors (CB) 24 pF. (Reproduced with permission from Ref. 41. Copyright 2002 American Chemical Society.)...

The mixing process of pesticide dispersion in a spray tank mounted on a tractor was monitored using optical back-scattering probes mounted in the tank [89]. A granulated powder was fully dispersed in 20 s whereas a powder product took 4 min. 

Fig. 7 Buchi/Brinkmann Lab Scale Spray-Dryer. A stock solution or suspension is pumped from the beaker through a nozzle which sits above the large glass particle formation vessel on the left-hand side. The nozzle atomizes the feedstock at temperatures ranging from ambient to 250° C into the particle formation vessel, using air or an inert gas such as nitrogen to dry and move particles into the cyclone and collection chamber on the right-hand side. Product temperature is monitored by a temperature probe mounted between the particle formation vessel and the cyclone. Solvent or water are exhausted through a fine particle filter bag in series with the cyclone, which also collects fines.

In developing API interfaces for FT-ICR-MS, one has to take account of the severe pressure restrictions in the ion cell a pressure of 10 Lpa is required for high-resolution applications. ESI FT-ICR-MS can be performed in two ways, i.e., with an external ion source in combination with a (quadmpole) ion guide, and with a probe mounted source which extends into the high field region. The first approach is more frequently applied. 

A real-time measure of the coefficient of friction is essential to a well-controlled CMP process. It is possible that this could be done by a coefficient of friction (COF) probe, mounted on the CMP tool, which could feed back observed values to the process control computer. There are several requirements in making a measurement that truly reflects the process conditions, the first of which is that the probe surface material should be the same as the wafer surface material (so the COF you read reflects what the wafer experiences). That situation, of course, is already inherent in the wafer carrier head, but the signal-to-noise ratio in trying to read the COF off the wafer carrier head is often too great to be of use. 

A later experiment modified the microdialysis probe with both inlet and outlet probes mounted on a single stiff tube, which meant that only one opening was required in the eye. In total, microdialysis probes were inserted into one eye of 10 rabbits. As in the previous experiments there was minimal ocular inflammation and there were no cases of endophthalmitis. The probes were perfused each day to prevent clogging (48). The probes were left in situ for an average of 20.8 days and... 

Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) are scanning probe techniques, in which sharp solid probe scans over the specimen surface and provides topographic information. STM provides information at the atomic level and can identify the arrangement of atoms on sample surface, hi this technique, a sharp tungsten tip is scanned very close to the sample surfece and tunneling current is measured. The current is inversely proportional to the tip-sample separation. AFM makes nse of a sihcon nitride probe mounted on a flexible cantilever. The movement of the cantilever is monitored by a laser beam focused on the surface as the probe scans the sample surface, attractive and repulsive forces between the probe and the surface are measured. 

Small or large areas of laminates or honeycombs can be tested by using single or multiple acoustic probes mounted upon appropriate scanning mechanics and feeding data process and presentation equipment. 

The US probe mounts on a specially customized bracket, which is attached to the stabilizer structure. When the lube knobs on the ball joints are loose, the clinician can easily and smoothly manipulate the position and orientation of the probe, and then can tighten it to lock the probe at the desired position. This architecture allows free motion in six degrees of freedom, thus enabling insertion of the probe into the patient s rectum freely without applying any force that may result in tearing the inner wall of the rectum or causing trauma to the patient. 

The measuring probe, mounted at the end of the quill, is usually a touch-trigger type used to measure discrete points. The probe has a stylus attached, at the end of which is a stylus tip, commonly a synthetic industrial ruby which makes contact with the surface being measured. 

---