Filters wedge-interference filter

For exceedingly weak chemiluminescent reactions it is possible to improve the light collection geometry at the expense of spectral resolution and to use a wedge interference filter spectrometer as shown in Fig. 4 (Hamman, Biggley and Seliger, 1979). 

In Fig. 4 an opaque plastic sample holder (H) whose 0.5-mm thick base contains a 3 mm wide x 10 mm long slit (S), positions the bottom of a 13 mm I.D. x 45 mm glass vial at 1.5 mm above the top surface of a Verlauf B-60 wedge interference filter (F) (60 mm long x 25 mm wide x 3 mm thick Schott Optical Glass Co., Inc.). The filter is mounted in a 3-mm thick filter holder which slides horizontally 1 mm above the photocathode of an EMI 9789 QB phototube (effective diameter of photocathode 10 mm). The total distance from the bottom of the solution in the glass vial to the photocathode is 6 mm. A synchronous motor rotates a screw drive which in turn drives the... 

Fig. 4. Schematic drawing of the details of the construction of the wedge interference filter spectrometer. J, injection port C, light-tight cover V, sample vial sample vial holder S, slit FH, filter housing F, wedge interference filter PT phototube PC, photocathode L, linkage to screw drive RF, RF shielded phototube housing.

At any wavelength setting of the wedge interference filter spectrometer the current measured due to a known chemiluminescent reaction in exactly the same geometry as any unknown reaction will be... 

A wedge-interference filter (WIF) consists of two quartz plates spaced by a dielectric wedge. Moving the wedge in front of a slit produces incremental wavelength bands. Paul Wilks has been its strongest supporter. Spectrometers that incorporate a WIF are full-spectrum instruments. 

Wedge-Interference Filters. Figure 4.1.7 is a schematic of a wedge-interference filter (WIF) spectrometer. Wedge filters are constructed similarly to fixed filters, with... 

Figure 4.1.7. Schematic of a wedge-interference filter spectrometer. The optical dielectric is held statically hy the two quartz plates.

Figure 4.1.8. The Wilks wedge-interference filter spectrometer (A) picture and (B) schematic. (Reproduced with permission from Wilks Enterprises, 140 Water Street, Norwalk, CT 06854).

Wilks Enterprise, Inc. 140 Water Street So. Norwalk, CT 06854 USA TEL 203-895-9136 FAX 203-838-9868 URL http //www.wilksir.com/ DA, wedge interference filters... 

Fig. 4,70a,b. Fizeau wavemeter (a) interference at a wedge (the wedge angle 0 is greatly exagerated) (b) schematic design A, aperture as spatial filter P, parabolic mirror C, distance holder of cerodur D, diode array... 

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