Abstract:
The present invention relates to a chemical luminescence-detecting apparatus that is provided with a plurality of optical detectors different in sensitivity in the vicinity of a photometric cell. A ratio of outputs from the optical detectors based on intensity of luminescence is previously determined and stored. Signal processing can multiply an output of a low sensitivity optical detector by a factor determined by the stored ratio to measure the intensity of luminescence so that a conversion value corresponding to an equivalent output from a high sensitivity optical detector may be obtained when the output from the high sensitivity optical detector has become saturated.
Abstract:
The present invention provides a high-dynamic-range sensing device and the sensing method thereof. The high-dynamic-range sensing device includes a control unit and sensing units with different sensing ranges. In the sensing method, the sensing units give sensing values, and then the control unit compares the sensing values and the upper sensing limit of the sensing units, respectively. When a sensing value is equal to the upper sensing limit, the control unit rejects the sensing value or interrupts the sensing of the sensing unit thereof. Thereby, the sensing device quickly excludes the sensing units which obtain saturated signals and their sensing values and thus switches between the alternative sensing units with different sensing ranges or picks up the optimum one of the sensing values.
Abstract:
The present invention provides a high-dynamic-range sensing device and the sensing method thereof. The high-dynamic-range sensing device includes a control unit and sensing units with different sensing ranges. In the sensing method, the sensing units give sensing values, and then the control unit compares the sensing values and the upper sensing limit of the sensing units, respectively. When a sensing value is equal to the upper sensing limit, the control unit rejects the sensing value or interrupts the sensing of the sensing unit thereof. Thereby, the sensing device quickly excludes the sensing units which obtain saturated signals and their sensing values and thus switches between the alternative sensing units with different sensing ranges or picks up the optimum one of the sensing values.
Abstract:
An ultraviolet radiation sensor includes an ultraviolet pass filter. A first photodiode senses light passing through the ultraviolet pass filter and provides an indication of ultraviolet light. A second photodiode provides an indication of infrared radiation. A correction circuit corrects the indication of ultraviolet light sensed by the first photodiode using the indication of infrared to account for infrared radiation that passes through the ultraviolet pass filter. Additional photodiodes may be used to correct for leakage current in the first and second photodiodes and stray infrared radiation that may affect the output of the first and second photodiodes.
Abstract:
A spectrophotometer is composed of a spectrofilter, a plurality of bandpass filters for cutting unnecessary transmission bands, and a CCD photosensor. The photosensor is composed of two sets of photosensors having different sensitivity ranges that overlap at some portion to increase the dynamic range of the device. The handling amount of charges is increased at every portion of the CCD photosensor in order to reduce the influence of the shot noise. Further, various technologies are used to enhance the accuracy and stability of the spectrophoto-measurement.