Spectrometer and method for correcting the same

Abstract

The invention relates to an optical spectrometer and a calibration method thereof. The optical spectrometer comprises a monochromator used for dividing the measured light into monochromatic lights, a photomultiplier used for receiving the monochromatic lights; the monochromator and the photomultiplier are optically connected. The photomultiplier is electrically connected with a microcontroller by a signal processing circuit. The optical spectrometer is characterized by further comprising a reference light source used for creating reference light; the reference light source which is alight-emitting diode is connected with the micro-controller. Compared with the prior art, the optical spectrometer and the calibration method thereof have the advantages as follows: 1. reasonable design, simple structure and large measuring dynamic range are ensured; 2. the absolute sensitivity of the photomultiplier is reasonably calibrated, therefore, the response linearity of the optical spectrometer is good; 3. thermostatic control is carried out to a reference detector, the reference light source and the photomultiplier, thus effectively enhancing the work stability of the optical spectrometer; and 4. the performance of the optical spectrometer is substantially enhanced under the condition that a small amount of cost is increased.

Description

technical field [0001] The invention relates to the field of spectral radiation testing, in particular to a spectrometer capable of correcting the absolute sensitivity of a photomultiplier tube within a large dynamic range and a calibration method thereof. Background technique [0002] The principle of the spectrometer to measure spectral radiation is generally: the measured incident light is irradiated in the incident slit of the monochromator, and the monochromator divides the measured light into monochromatic light within a certain wavelength range, and then the monochromatic light within a certain bandwidth The light is sequentially emitted from the exit slit and irradiated on the photoelectric sensor, and the signal generated by the photoelectric sensor is proportional to the intensity of the light irradiated on it. By comparing this signal with the signal of a standard light source with known spectral power distribution, the spectral power distribution of the measured ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above problems, to provide a spectrometer with reasonable design, simple structure, which can effectively improve the working stability, linearly correct the absolute sensitivity of the photomultiplier tube, and then improve the measurement accuracy and realize a large dynamic measurement range. And the calibration method that cooperates with this spectrometer; it solves the technical problems of photomultiplier tube response instability, absolute sensitivity non-linearity, small dynamic range, and poor measurement accuracy in the prior art

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