| OCR Text |
Show ambient reflected light, and electromagnetic Steps have been due to these and interference lead to invalid measurements. taken which eliminate invalid measurements phenomena. Light occasionally reflected off the walls, floor, or objects in the room byanearby light source has caused the only observed invalid measurements. Most of the development problems were hardware problems. The vast difference between a theory and an implemented, working system was clearly demonstrated. Grounding problems provided the greatest difficulty. Inadequate centering the disk and the motor shaft had to be compensated for in software. Design of a satisfactory pulse amplifier circuit was a most challenging problem. Alignment of the reference pulse assembly proved to be difficult. Printed circuit board cards which did not fit properly led to difficulties in the digitizer and control unit. Balancing of the disks required the resurrection of an accelerometer. Disks which were not satisfactorily balanced caused problems by vibrating and subsequently breaking the photomultiplier tube socket connections. Design of an optical system to gather light from any area of the room and focus it onto a relatively small photocathode required an interesting arrangement of lens, and a condensing problems centered around an objective lens, a Fresnel lens. Other hardware development the timing of light-emitting diodes, determining the horse power required to spin the |
