Focal plane detection Focus

In focal-plane detectors, the simultaneous detection of all spatially dispersed multiplex detection) ions is achieved, resulting in several orders of improvement in detection efficiency over that of focal-point detectors [87]. A photographic plate is the earliest example of focal-plane detection which in the past was used in conjunction with Mattauch-Herzog double-focusing mass spectrometers. 

Figure 3.6 Schematicofa double-focusing sector field mass spectrograph with Mattauch-Herzog geometry with a linear imaging curve (double focusing for ions of all masses simultaneously) modified field combination with 70°. In the mass spectrograph, photographic ion detection or focal plane array detectors are used for quasi-simultaneous detection of separated ion beams. (H. Kienitz (ed.), Massen-spektrometrie (1968), Verlag Chemie, Weinheim. Reproduced by permission of Wiley-VCH)...

Fig. 3. Simplified diagram of the confocal components of the AC AS 570. The laser beam is expanded to provide a diffraction limited spot at the sample. A focusing lens in front of the detection system directs the fluorescence from the focal plane through an adjustable pinhole. In the bilateral laser scanning confocal microscope, a similar technique is employed with a cursor rather than a point for illumination and detection.

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