Abstract:
Various embodiments include systems and methods to provide selectable variable gain to signals in measurements using incident radiation. The selectable variable gain may be used to normalize signals modulated in measurements using incident radiation. The selectable variable gain may be attained using a number of different techniques or various combinations of these techniques. These techniques may include modulating a modulator having modulating elements in which at least one modulating element acts on incident radiation differently from another modulating element of the modulator, modulating the use of electronic components in electronic circuitry of a detector, modulating a source of radiation or combinations thereof. Additional apparatus, systems, and methods are disclosed.
Abstract:
The light power monitoring device includes: a first optical fiber; a second optical fiber connected to the first optical fiber; a low-refractive-index resin layer which covers (i) a connection between the first and the second optical fibers and (ii) a predetermined region of the second optical fiber which region extends from the connection toward a forward-propagating-light-output side; a high-refractive-index resin layer which covers a region of the second optical fiber which region is not covered by the low-refractive-index resin layer; and an outputted light detecting device which is provided at a position corresponding to an end of the low-refractive-index resin layer which end is located on the forward-propagating-light-output side of the second optical fiber or at a position which is away toward the forward-propagating-light-output side of the second optical fiber from the position corresponding to the end of the low-refractive-index resin layer.
Abstract:
The present invention provides methods and systems for measuring optical power that require neither alterations to the optical fiber nor physical contact with the optical fiber, the system including an optical fiber configured to propagate an optical signal, wherein the optical fiber includes a core and at least a first cladding layer, wherein a portion of the optical signal scatters out of the optical fiber along a length of the optical fiber to form scattered fiber light; a detector system configured to receive the scattered fiber light along the length of the optical fiber and to output a detection signal based on the received scattered fiber light; and a processor configured to receive the detection signal and to determine a power value of the optical signal based on the received detection signal.
Abstract:
A circuit includes a first photo detector and a second photo detector to receive a first and second light input signal, respectfully, to generate a first current output signal and second current output signal respectively in response to the respective light input signals. A current multiplier stage receives the second current output signal from the second photo detector to generate a multiplied current output signal that is greater than the magnitude of the second current output signal. A differential multiplier having a first current path receives a portion of the multiplied current output signal and a second current path that receives another portion of the multiplied current output signal. The first current path is in series with the first current output signal to facilitate balancing of currents between the first current output signal of the first photo detector and the second current output signal of the second photo detector.
Abstract:
The present invention discloses a method for measuring absolute value of non-linear error and an apparatus thereof. The method comprises: placing N reflecting plates jointed together at the sample port of the optical measuring instrument at the same time, wherein each of reflecting plate has a same covering area at the sample port; placing an aperture along light paths of the optical measuring instrument; adjusting the number of reflecting plates as used according to a position in the measuring range of the optical measuring instrument where the non-linear error is required to be measured; following every adjustment, acquiring the output results when the adjusted reflecting plates are placed at the sample port; performing a computation processing for non-linear error to the output results; and acquiring the non-linear error of the output results of the optical measuring instrument.
Abstract:
A method for determining a physical property of a biological sample. The method comprises the steps of: acquiring a set of preliminary calibration signals of a first lot of a reagent using an automatic analyzer with a first photometry module; acquiring a reference set of signals of the first lot of the reagent using a calibration analyzer with a second photometry module; determining a set of module specific components by subtracting the reference set of signals from the preliminary calibration signals; acquiring a lot specific set of signals of a second lot of the reagent using the second photometry module; determining a lot calibration for the first photometry module using the set of module specific components and the lot specific set of signals; acquiring a measurement signal of the biological sample using the first photometry module and the second lot of the reagent; and determining a physical property of the biological sample using the measurement signal and the lot calibration.
Abstract:
In a laser-produced plasma (LPP) extreme ultraviolet (EUV) system, laser pulses are used to produce EUV light. To determine the energy of individual laser pulses, a photoelectromagnetic (PEM) detector is calibrated to a power meter using a calibration coefficient. When measuring a unitary laser beam comprising pulses of a single wavelength, the calibration coefficient is calculated based on a burst of the pulses. A combined laser beam has main pulses of a first wavelength alternating with pre-pulses pulses of a second wavelength. To calculate the energy of the main pulses in the combined laser beam, the calibration coefficient calculated for a unitary laser beam of the main pulses is used. To calculate the energy of the pre-pulses in the combined laser beam, a new calibration coefficient is calculated. When the calculated energy values drift beyond a pre-defined threshold, the calibration coefficients are recalculated.
Abstract:
An optical power monitoring device includes a photodetector disposed in close proximity to the cladding of an optical fiber for measuring Rayleigh scattered light from the core of the optical fiber. To ensure only Rayleigh scattered light is measured, a cladding stripper is provided to remove any cladding light prior taking a reading with the photodetector.
Abstract:
The present invention discloses a method for measuring absolute value of non-linear error and an apparatus thereof. The method comprises: placing N reflecting plates jointed together at the sample port of the optical measuring instrument at the same time, wherein each of reflecting plate has a same covering area at the sample port; placing an aperture along light paths of the optical measuring instrument; adjusting the number of reflecting plates as used according to a position in the measuring range of the optical measuring instrument where the non-linear error is required to be measured; following every adjustment, acquiring the output results when the adjusted reflecting plates are placed at the sample port; performing a computation processing for non-linear error to the output results; and acquiring the non-linear error of the output results of the optical measuring instrument.
Abstract:
A connector of connecting a light sensor and a substrate is utilized for rotating the light sensor so that the light-receiving direction of the light sensor is parallel with the substrate. When the connector is utilized in an optical touch system, the light sensor can be disposed on the substrate of the optical touch system by means of general manufacturing facilities of flat display panels. Meanwhile, the light-receiving direction of the light sensor is parallel with the substrate of the optical touch system.