Abstract: A data recording system for scanning tissues of human beings or other objects from crime scenes includes a hand-held scanner and computer. The scanner has a housing including a platen along the bottom surface of the housing, a scanning mechanism including an illumination source and sensor positioned within the housing under a platen, a control unit, memory for storing data files, and disposable spacers removably attached to the bottom surface of the housing that hold the scanner a predetermined distance from the tissue or object. The scanner is placed over the tissue or object and emits light from the illumination source there toward. A predetermined range of light wavelengths reflected by the object is sensed by sensors and sensor signals are generated corresponding thereto. The controller processes the sensor signals and stores them as a data file in the memory for use in medical and crime scene analysis.

Abstract: A toner concentration monitor for use with an electrographic apparatus having an interface mechanism for receiving a replacement toner container upon removal of an exhausted toner container and also having a replenishment mechanism for dispensing fresh toner from a received container to the developer mixture to replace toner used during the development process. The monitor produces a first signal representative of the reflectivity of the developer mixture. A digital computer receives a count signal each time a replacement container is received by the interface mechanism. The computer responds to these count signals and produces an offset signal adapted to compensate for changes in the reflectivity of the developer mixture caused by the build-up of a film of toner material on the carrier particles (carrier scumming). Such scumming generally occurs in proportion to the amount of toner used.