Abstract: An ultraviolet radiation protection evaluator for determining the effectiveness and protection rating of sunscreen. The apparatus contains a fiber optic probe for delivering Ultraviolet radiation directly to skin. The probe receives reflected and diffused ultraviolet radiation from the skin and transmits the same to a monochromator which performs a spectral analysis and evaluation on the reflected radiation. This information is transmitted to a computer having software for evaluating the readings. The readings are taken first on untreated skin then again on skin treated with a sunscreen. The software, via variables inputted to the computer, computes the ratio of the sunscreen data obtained from both the treated and untreated skin along with the product of the spectrum of the light and radiation source and the action spectrum of UV induced erythema and qualitively characterizes the sunscreen in relation to natural skin protection.

Abstract: In accordance with the present invention an improved forensic light source comprising a source of light and support structure for supporting the source of light is provided. A light guide having first and second ends is coupled to the source of light at the first end to receive light from the source of light and transmit the light to the second end. The light guide is mounted on the support structure. A filter support member supports a plurality of filters. A movable light directing assembly is mounted on the second end of the light guide for movably supporting the filter support member for movement to a plurality of positions. Each of the positions corresponds to the coupling of a selected one of the filters to the second end, whereby the light is filtered by the selected filter. A heat sink may be coupled to the first end of the light guide.

Abstract: A compact spectrum analyzer module suitable as a subsystem in optoelectronic instrumentation is disclosed which analyzer module employs two mirror surfaces to provide a folded optical path to and from a stock concave focusing diffraction grating. The module has mutually perpendicular input and output optical paths whereby input and output slits, or apertures, can be positioned on adjacent, mutually perpendicular faces of a box-like rectangular housing providing more convenience in the location of external system components such as light samplers and detector arrays, in many situations. Mirror orientation is effective to turn the output optical path through ninety degrees from the input path and to generate from polychromatic light a focused output spectrum in a plane parallel with the input path. Both the input path and the focused output spectrum lie, in preferred embodiments, in planes, not necessarily coincident, that are perpendicular to the optical axis of the grating.

Abstract: A device for illuminating forensic depositions or other evidence that simultaneously provides output in three bands, the visible, ultraviolet and infrared. By a sequential mounting and rotation in two independent axis of a large selection of wavelength and bandwidth filters, the invention provides a highly-focused illumination system easily adjustable by the operator to enable selection of particular frequencies and bandwidths for enhanced observation of forensic subjects.

Abstract: In accordance with the present invention, a low noise light source for illuminating a treated or untreated deposition of material for forensic examination is disclosed. A light having a wide range of wavelengths is generated. The light is directed toward a reflective diffraction grating. The relative position between an exit slit and the grating is repeatedly adjusted to result in passage through the exit slit of different desired bands of wavelengths of output light from portions of the light reflected by the grating. The output light is directed through a filter, toward the deposition to be examined. The filter has a pass characteristic which substantially passes the desired bands and blocks the light that has a wavelength in an expected range of fluorescence of the deposition.

Abstract: A method of illuminating a deposition of organic material such as, blood, sweat or oil for forensic examination is disclosed. Light having a wide range of wavelengths is generated and directed towards a reflective diffraction grating. The relative position of an exit slit with respect to the grating is adjusted to pass a desired band of wavelengths of output light from portions of the light reflected by the grating. The output light is then directed toward the deposition to be examined through the use of a fiber optic bundle, preferably a liquid fiber optic member. Adjustment of the relative position of the exit slit with respect to the grating is achieved by rotation of the grating. Movement is controlled by an electronic control and a handheld remote control pad.

Abstract: A light analysis system is disclosed and comprises a source of substantially collimated light to be analyzed. The source comprises a sample excited by a collimated laser light source, and further comprises a holographic notch filter having the characteristic of reflecting light at the excitation wavelenghth at which the source is excited. An aberration corrected concave focusing diffraction grating receives the collimated light and focuses it at a point corresponding to its wavelength. A detector detects light at a desired wavelength focused by the diffraction grating. The holographic notch filter is positioned to filter the source of substantially collimated light to be filtered and the holographic notch filter is oriented substantially at an angle with respect to the collimated laser light source to result in a path length for the collimated laser light source which constrains a path length through the notch filter which causes the collimated laser light to be reflected by the filter away from the grating.

Abstract: An apparatus for compressing a workpiece is disclosed. The apparatus has a die to receive the workpiece in powdered or other form. An abutment holds the workpiece in a fixed position against the application of force, while a hydraulic cylinder is positioned to exert force against the die in the direction toward the abutment. A pump feeds hydraulic fluid to the hydraulic cylinder, and a pressure control valve is coupled to the hydraulic cylinder to control the maximum pressure in the hydraulic cylinder. The pressure control valve has a sealing member, a seat which engages the sealing member with the sealing member closing the outlet, a spring which urges the sealing member towards the seat, closing the outlet, and a backing member putting the spring under compression by maintaining a distance between the backing member and the seat. A stepping motor is rigidly mounted with respect to the seat.

Abstract: In accordance with the present invention an improved forensic light source comprising a source of light and support structure for supporting the source of light is provided. A light guide having first and second ends is coupled to the source of light at the first end to receive light from the source of light and transmit the light to the second end. The light guide is mounted on the support structure. A filter support member supports a plurality of filters. A movable light directing assembly is mounted on the second end of the light guide for movably supporting the filter support member for movement to a plurality of positions. Each of the positions corresponds to the coupling of a selected one of the filters to the second end, whereby the light is filtered by the selected filter. A heat sink may be coupled to the first end of the light guide.