Abstract:
A method of broad screen detection, competitive dye desorption from a solid adsorbent, is described for quantifying the presence of a molecule or target analyte in the vapor phase, in solution, or eluted from a solid. In the function of an analytical element for implementing the competitive dye desorption method of the invention, dye or dye-precursor molecules adsorbed on the surface of an adsorbent are caused to desorb through the adsorption of the target analyte on the adsorbent. The desorbed dye or precursor is made detectable through sequestering of a radiation detectable species in the device of the invention. Such detection may occur, e.g., through absorption or emission of radiation in regions of the spectrum extending from the ultra-violet through the visible and into the infra-red regions. In one aspect of the invention, these processes occur within a multi-layer analytical element, in which the functions of the device may be executed by different layers.
Abstract:
The effect of radiant energy in the sunburn region, about 290 to 320 nanometers, on the human skin is estimated by comparing the color change of a test area having a compound which changes color as a function of the cumulative exposure to such radiation with at least one color standard area which matches the color attained by said test area after exposure to different predetermined quantities of such radiation.
Abstract:
A device in which an electrical current flowing through an electrolyte indicates a true value proportional to the intensity of ultraviolet rays, regardless of the ambient temperature. A positive characteristic heat sensing resistor is combined in series with an ultraviolet responsive semiconductor element in a circuit for measuring ultraviolet energies. This circuit includes a scale for indicating the amount of deposited mercury produced by electrolyzing mercury iodide solution with the photocurrent from said ultraviolet responsive semiconductor element. The positive characteristic heat sensing resistor is connected in parallel with the mercury electrolyte and the electrical circuit thereof.
Abstract:
Energy distribution within a laser beam is measured and a sample of the intensity is obtained, providing a self-calibrated photograph on a single film sample. A burst of laser energy striking a wedge plate or prism within the beamspread measurement camera is divided into multiple reflections within the prism. Each reflection is at a slightly greater angle than the preceeding one and is attenuated with respect thereto. Each reflection is collected by a lens and focused onto a spectrographic plate located at the lens focal point. The diameter of each image on the film is the product of the lens focal length and beamspread. The distribution pattern of each reflected sample is recorded on the same plate and can be compared with preceeding samples, each sample being a known percentage of the preceeding waves. Relative energy as a function of beamspread is determined by measuring the energy density of each image with a densitometer. Any point on each image of reflected energy is a known percentage of that point on the other images and provides a standard for determining the contour ring for a particular energy density on the initial spot, thus providing a contour map of the main beam.
Abstract:
This disclosure relates to an ultraviolet light-sensitive cell which is useful for detecting and measuring the intensity of ultraviolet light. The cell comprises an electrolyte, a metalcontaining semiconductor electrode and a counter electrode.
Abstract:
A device for determining the quantity of laser radiation exposed to the eyes or body of an observer in a given period of time. A beam splitter mounted on a spectacle frame directs a small portion of incident laser light to a photosensing device such as a plate of photosensitive film also carried on the frame. A light filter, which has a band pass which passes laser frequencies and blocks the remaining band of the spectrum is supported between the film and the beam splitter. The incident laser radiation is now monitored by the film. When the film is developed, one can determine the total quantity of laser light passing into the eyes or other body portions from the exposure of the film.