A Spectral Measurement CCD Module with Improved Detection Sensitivity

Abstract

The invention provides a spectral measurement CCD (Charge-coupled Device) module for improving detection sensitivity, which comprises an optical calibration unit with aberration correction and energy convergence functions. The optical calibration unit is arranged in front of the CCD; the optical calibration unit is a conventional cylindrical lens or a non-conventional cylindrical lens for adjusting a convergence position influencing sensitivity along a spectral height direction and a focusing position influencing resolution along a spectral width direction to a position where a CCD pixel is; and the non-conventional cylindrical lens is a cylindrical lens with curvature invariant and thickness variant gradually or a cylindrical lens with thickness invariant and curvature variant gradually or a doublet cylindrical lens. As the optical calibration unit with the aberration correction and energy convergence functions is arranged, and spectral detection sensitivity and resolution are improved significantly. Further, through a cooling unit, temperature is stably controlled to reduce noise and signal drift.

Description

technical field [0001] The invention relates to the field of optical detection and analysis, in particular to a spectral measurement CCD module with improved detection sensitivity. Background technique [0002] CCD, full name in English: Charge-coupled Device, full name in Chinese: charge-coupled device, can be called a CCD image sensor, also called an image controller. In terms of function, it includes two categories: linear array CCD and area array CCD. [0003] Sensitivity, resolution, signal-to-noise ratio, and baseline stability are important technical performance indicators of spectroscopic instruments. In spectroscopic measurement devices or instruments that use CCDs, especially linear array CCDs, as receivers, due to the limited height of CCD pixels, spectral imaging A large part of the light energy on the surface cannot be received by the photosensitive surface of the CCD, thus restricting the ability of the spectrometer to detect weak light signals, that is, the s...

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Problems solved by technology

[0003] Sensitivity, resolution, signal-to-noise ratio, and baseline stability are important technical performance indicators of spectroscopic instruments. In spectroscopic measurement devices or instruments that use CCDs, especially linear array CCDs, as receivers, due to the limited height of CCD pixels, spectral imaging A large part of the light energy on the surface cannot be received by the photosensitive surface of the CCD, thus restricting the ability of the spectrometer to detect weak light signals, that is, the sensitivity is not high

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