Dark Background Noise Subtraction Method for Raman Spectrometer Using Grating Array Detector
A Raman spectrometer and grating array technology, which is applied in the field of rapid deduction of background dark noise of Raman spectrometers, can solve the problems of large measurement error and high measurement cost, and achieve the effects of small measurement error, low measurement cost and short time-consuming.
Active Publication Date: 2021-11-02
奥谱佳测(江苏)信息科技有限公司
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[0006] The technical problem to be solved by the present invention is to provide a method for subtracting background dark noise of a Raman spectrometer using a grating array detector, so as to solve the above-mentioned shortcomings of high measurement cost and large measurement error in the prior art
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Embodiment 1
[0051] A method for subtracting background dark noise in a Raman spectrometer using a grating array detector, the method takes the background noise subtraction in the Raman spectrum of acetaminophen measured by excitation at 532 nm as an example, and includes the following steps:
[0052] First select 1s integration time, and compare the Raman spectra of acetaminophen measured by the current instrument's dark noise subtraction method and without dark signal subtraction, see figure 1 ,exist figure 1 Among them, P1 is the Raman spectral signal of acetaminophen measured after deducting dark noise, and P2 is the Raman spectral signal of acetaminophen measured without deducting dark noise.
[0053] 1) Determine the base space matrix of the spectrometer:
[0054] 1-1) Select a spectrometer excited at 532nm, record 100 dark noise data at 10ms integration time, and then record the average output of the 100 dark noise data;
[0055] 1-2) Adjust the integration time to 20ms and 50ms...
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A method for subtracting background dark noise of a Raman spectrometer using a grating array detector, relates to a method for subtracting background dark noise of a spectrometer, the method is to pre-store the array dark response sequence to form an array detector base space matrix, and the actual response After the signal is decomposed by eigenvalues, the second eigenvector is extracted to restore the detection signal with the background background of the array detector subtracted, so as to realize fast subtraction of spectral background dark noise. The invention does not need to record the dark noise every time, not only saves the measurement time, improves the work efficiency, reduces the measurement cost, but also reduces the error of measurement drift with time. Moreover, for the continuous measurement of the process, operations such as correction of drift without stopping the machine can be performed, which provides greater convenience for continuous dynamic correction.
Description
technical field [0001] The invention relates to a background dark noise subtraction method of a spectrometer, in particular to a fast background dark noise subtraction method of a Raman spectrometer using a grating array detector. Background technique [0002] The rapid development of Raman spectrometers mainly benefits from the development of laser technology and the application of grating array detectors. CCD and CMOS array photodetectors can obtain spectral information of enough pixels at the same time, which meets the requirements of Raman spectroscopy for fast response, significantly shortens the spectrum acquisition time, and enhances the practicability of Raman spectroscopy. The mainstream structure of the instrument. [0003] All photosensitive elements have random noise responses. Due to the randomness of the manufacturing of the photosensitive elements collected by the array, each photosensitive point exhibits randomness. In terms of signal performance, the random...
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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 姚志湘姚桔粟晖张景清
Owner 奥谱佳测(江苏)信息科技有限公司