High-luminous-flux miniature Raman spectrometer

By integrating the optical design of the excitation module and the spectral system, and employing large numerical aperture aspherical lenses and cemented doublet lenses, the problems of low light flux and signal attenuation in Raman spectrometers were solved, achieving high-precision detection in a high-light-flux, low-cost, and portable Raman spectrometer.

CN122306781APending Publication Date: 2026-06-30HARBIN ENG UNIV
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Patent Information

Application Number
CN202610571964.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-28
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing Raman spectrometers suffer from low light flux, easy signal attenuation, and difficulty in balancing system size and performance. Traditional discrete spectrometers also result in low sensitivity.

Method used

Design an optical system that integrates an excitation module, an external optical path system, and a beam splitting system. Employ aspherical lenses with large numerical apertures and cemented doublet lenses, combined with components such as dichroic mirrors and long-pass filters, to achieve efficient excitation and signal collection, and separate and focus detection through the beam splitting system.

Benefits of technology

It significantly increases light throughput, improves sensitivity and resolution, reduces system costs, and enables portable and high-precision detection.

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Abstract

The invention discloses a high-luminous-flux miniature Raman spectrometer, and belongs to the field of spectrum analysis instruments. Comprising a laser module, a reflector path system and a beam splitting system. The laser module comprises a narrow-band laser module and a collimating mirror; the external light path system comprises a dichroscope, an aspherical lens, an objective table, a long-pass optical filter, a doublet lens and a slit; the beam splitting system comprises a collimating mirror, a blazed grating, a focusing mirror and a linear array charge-coupled device. The laser module, the reflector path system and the light splitting system are integrated into a whole, so that signal attenuation of optical fiber transmission is avoided; high-efficiency excitation and signal collection of a sample are realized by adopting a large-numerical-aperture aspherical lens; light beams are converged to the slit through the doublet lens, the size of a light path is reduced, and axial chromatic aberration is eliminated; and a cascade filtering structure of the dichroscope and the long-pass optical filter is combined, so that Rayleigh scattering light interference is effectively inhibited. And the light flux is obviously improved while the resolution is ensured, and the device has the advantages of low cost, high precision and portability, and is suitable for the fields of food safety detection and the like.
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