Spectrophotometric system for measuring water quality

    公开(公告)号:US10041923B1

    公开(公告)日:2018-08-07

    申请号:US15486236

    申请日:2017-04-12

    Abstract: A system for measuring water quality parameters, such as pH, CO2, alkalinity, and so forth, includes sensors or other measuring components integrated onto a circuit board. The circuit board may be contained within a submersible, watertight housing. A spectrophotometer may be located on the circuit board to measure the wavelength and intensity of light transmitted through the water being tested. Sensors for measuring salinity, pressure, temperature, or other properties may also be included on or near the circuit board. A microcontroller for processing these measurements is located on the circuit board. System components used to direct and filter the water, such as certain pumps, filters, and so forth, may be included in the housing off of the circuit board. Integrating the sensors and other measuring components onto a circuit board allows for a compact, low-cost water-quality-measuring system that is capable of making very accurate and precise measurements.

    Simplified compressive sensing spectral imager

    公开(公告)号:US09880054B2

    公开(公告)日:2018-01-30

    申请号:US14341361

    申请日:2014-07-25

    Inventor: Lenore McMackin

    Abstract: A method for designing a spectral sensing device. The method includes: (1) performing computational operations on a computer, wherein the computational operations determine the positions of diffracted orders of an optical system model that models at least an array of light modulating elements and a diffraction grating, wherein the diffracted orders correspond to respective spectral components of input light to the optical system model, wherein the positions of the diffracted orders are determined at a target plane of the optical system model; and (2) storing the positions of the diffracted orders in a memory, wherein the positions determine corresponding locations for light detectors in the spectral sensing device. The spectral sensing device may be assembled by modifying an existing single pixel camera, i.e., by adding the diffraction grating and adding the light detectors respectively at said positions of the diffracted orders.

    Method for estimating channel power, method for monitoring frequency spectrum characteristic, apparatus and system

    公开(公告)号:US09859977B2

    公开(公告)日:2018-01-02

    申请号:US15075862

    申请日:2016-03-21

    CPC classification number: H04B10/07955 G01J3/00 H04B10/07957

    Abstract: A method, apparatus and system estimating channel power, and monitoring a frequency spectrum characteristic. A method for estimating channel power includes extracting frequency spectrum information from a received signal, so as to obtain a frequency spectrum of the received signal, estimating power of a central channel in the frequency spectra according to a power value of a flat area of the central channel, and estimating power of a neighboring channel in the frequency spectra according to a power value of a flat area of the neighboring channel. With the embodiments of the present disclosure, the power of the central channel and the power of the neighboring channel may be estimated by using only frequency spectrum information obtained by a single optical receiver, so as to quantitatively evaluate influence of a power imbalance effect, thereby ensuring precision of the power estimation, and reducing effects of nonideal factors on the estimated values.

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