Microchannels plate design

Figure 25.11 MicroChannel plate design (left) and mounted microchannel reactor (right) for methanol OSR [36].

Besides standard designs special GDC designs have been developed for registration of charge patterns upon the electrostatic paper with thermoplastic potential layers with an input semiconductor target, with a microchannel plate at the input and so on. The GDC design provided the basis for series production of GDC with maximum dimensions (500 x 600 mm ) and a service life above 5000 hours. 

An assemblage (array) of single-point electron multipliers in a microchannel plate is designed to detect all ions of any single m/z value as they arrive separated in time. Thus, it is not necessary for each element of the array to be monitored individually for the arrival of ions. Instead, all of... 

MCPs operate on the same principle as CDEMs. A microchannel plate is essentially a monolithic array of miniaturized CDEMs fabricated in a single wafer or disk of glass. The disk contains pores extending from the upper surface to the lower surface. These pores are known as channels and perform the same function as the interior of the tube in a CEM, but in contrast to a typical CEM, the entrance ends of the channels are not flared. The channels are typically 3 to 30 micrometers in diameter depending on the design. The length of the channels is set by the thickness of the disk, typically 200 to 1000 micrometers. MicroChannel plates can be fabricated in areas measured in cm, and because the disk-shaped profile forms a nearly flat stopping surface for ions, they are ideal detectors for TOE mass spectrometers. Burle and Hamamatsu are the major suppliers of these devices. 

To achieve all of the benefits of the microchanneled, flat plate design, multiple membrane wafers must be stacked together to form multiwafer modules. 

Figure 4.112 MicroChannel plate a microholes b design of a microchannel plate c principle of amplification d two-stage microchannel plate...

MicroChannel Plates. One type of array transducer for mass spectrometry is the electrooptical ion detector (EOID) shown in Figure ll-4a. The key clement in the EOID is the microchannel electron multiplier, or microchannel plate, which is referred to in some optical applications as an image intensilier. The design and basic principles of operation of the microchannel plate are illustrated in Figure 1 l-4b. The plate consists of an array of tiny lubes (diameters as small as 6 pm)... 

In this study, we developed microchannel PrOx reactor to control CO outlet concentrations less than 10 ppm from methanol steam reformer for PEMFC applications. The reactor was developed based on our previous studies on methanol steam reformer [5] and the basic technologies on microchaimel reactor including design of microchaimel plate, fabrication process and catalyst coating method were applied to the present PrOx reactor. The fabricated PrOx reactor was tested and evaluated on its CO removal performance. 

Method //was designed for a bonded microreactor. After the channel was sealed with a Pyrex top plate using the anodic bonding technique, the liquid precursor was infiltrated into the microreactor through the outlet of the reactor under slight pressure and withdrawn. A thin film of solution remained on the walls of the microchannel. 

Initially, the reactor was to be built using silicon wafers, 92 but more recent efforts have focused on a stainless steel reactor. The reformer, 7.5 x 4.5 x 11.0 cm (371 cm ), houses up to 15 stainless steel plates (0.5 mm thick) with chemically etched microchannels and heating cartridges. Conventional and laser micromachining techniques were used to fabricate the reformer body. The microchannel dimensions are 0.05 x 0.035 x 5.0 cm . The reactor inlet was carefully designed to allow uniform flow conditions. ... 

---