CN210464664U - Full-waveband blank-window-free wavelength standard light source - Google Patents
Full-waveband blank-window-free wavelength standard light source Download PDFInfo
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- CN210464664U CN210464664U CN201921381212.3U CN201921381212U CN210464664U CN 210464664 U CN210464664 U CN 210464664U CN 201921381212 U CN201921381212 U CN 201921381212U CN 210464664 U CN210464664 U CN 210464664U
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- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 238000001675 atomic spectrum Methods 0.000 claims abstract description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
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- 229910052786 argon Inorganic materials 0.000 description 1
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
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- 229910052754 neon Inorganic materials 0.000 description 1
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Abstract
A full-waveband blank-window-free wavelength standard light source relates to the field of wavelength standard light sources. The optical etalon comprises a wide-spectrum light source, an achromatic lens pair, a pinhole, a first collimating lens, an optical etalon, a semi-reflecting and semi-transmitting beam splitter, a second collimating lens and an atomic spectrum light source which are arranged in sequence; the wide-spectrum light source is combined with the achromatic lens pair and the pinhole to emit continuous-spectrum light beams subjected to spatial filtering, the continuous-spectrum light beams are filtered by the optical etalon to generate light beams of a comb-shaped spectrum, and the light beams of the comb-shaped spectrum and the light beams emitting known atomic spectral lines are combined by the semi-reflecting and semi-transmitting beam splitter to obtain the light beams carrying the known atomic spectral lines in the comb-shaped spectrum.
Description
Technical Field
The utility model relates to a wavelength standard light source field especially relates to a full wave band does not have empty window wavelength standard light source.
Background
At present, standard light sources for wavelength calibration of spectrometers usually employ light sources with atomic emission lines such as neon, mercury, argon, etc. (Roc, Inc., journal of metrology, 2007, Vol.28, p.z 1, pp.169-173), which contain a limited number of lines and are not uniformly distributed, often leaving windows in some bands. When the atomic spectral line lamp sources are used for spectrum calibration, due to the fact that the number of standard spectral lines is limited and the standard spectral lines are not distributed uniformly, the wavelength deviation trend of each position on a spectrum axis is difficult to accurately master, although good calibration can be achieved near the spectral line position, and the accuracy of the wavelength is difficult to guarantee at a position far away from the spectral line.
To realize a light source with dense spectral lines and uniform distribution, the light source can be obtained by filtering a wide-spectrum light source by using the comb-shaped filtering function of an optical etalon with high fineness (bear victory et al, chinese patent, CN2015102613599), the light source spectrum filtered by the optical etalon is comb-shaped spectral lines, and the wavelengths of the spectral lines are the resonant wavelengths of the resonant cavity of the fabry-perot etalon, so that a series of spectral lines with uniform and dense distribution can be obtained. However, the wavelengths of these lines depend on the cavity length of the etalon, are affected by the processing accuracy, and are susceptible to changes due to factors such as temperature and stress, and thus it is difficult to obtain a constant wavelength reference light source.
Disclosure of Invention
An object of the utility model is to solve the above-mentioned problem among the prior art, provide a full wave band does not have empty window wavelength standard light source, pass through optical etalon with a wide spectrum light source and filter out the pectination spectral line, combine together with the atomic spectral line again, through the wavelength of demarcating each broach spectral line of optical etalon in real time to realize that spectral line quantity is intensive and the even wavelength standard light source distributes.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a full-wave-band blank-window-free wavelength standard light source comprises a wide-spectrum light source, an achromatic lens pair, a pinhole, a first collimating lens, an optical etalon, a semi-reflecting and semi-transmitting beam splitter, a second collimating lens and an atomic spectral line light source which are sequentially arranged; the wide-spectrum light source, the achromatic lens pair, the pinhole, the first collimating lens and the optical etalon are coaxially arranged, the semi-reflecting and semi-transmitting beam splitter is obliquely arranged, and the second collimating lens and the atomic spectral line light source are sequentially coaxially arranged below the semi-reflecting and semi-transmitting beam splitter;
the wide-spectrum light source is used for emitting continuous-spectrum light rays, the achromatic lens is used for refocusing the light rays emitted by the wide-spectrum light source, the pinhole is used for carrying out spatial filtering on the refocused light rays, the first collimating lens is used for collimating the light beams subjected to spatial filtering of the pinhole, and the optical etalon is used for aligning the straight light beams and carrying out comb-shaped filtering so as to enable the spectrum of the light beams to be changed into comb-shaped spectral lines from the continuous spectrum;
the atomic spectral line light source is used for emitting an atomic spectral line with a known wavelength value, and the second collimating lens is used for collimating the atomic spectral line light beam;
the semi-reflecting and semi-transmitting beam splitter is used for combining the atomic spectral line beam and the comb spectral line beam filtered by the optical etalon to obtain the beam with the spectral shape of the comb spectral line mixed atomic spectral line.
The semi-reflecting and semi-transmitting beam splitter is a semi-reflecting and semi-transmitting full-wave band beam splitter.
A wavelength calibration method of a full-waveband blank-window-free wavelength standard light source comprises the following steps: selecting two atomic spectral lines with known wavelengths, calibrating the wavelengths of two comb spectral lines close to the atomic spectral lines by using the atomic spectral lines, counting the number of comb teeth between the two comb spectral lines, and calculating and calibrating the actual wavelength value of each comb spectral line by using the principle that the frequency intervals of the comb spectral lines of the optical etalon are strictly equal.
Compared with the prior art, the utility model discloses technical scheme obtains beneficial effect is:
1. the utility model discloses an application optical etalon and half reflection semi-permeable beam splitter combine atomic spectral line light source and pectination spectral line light source to construct the wavelength standard light source that full wave band does not have empty window, compares atomic spectral line standard light source, the utility model discloses a wavelength standard light source has spectral line quantity intensive, the characteristics of distributing evenly, full wave band distributes; the wavelength standard light source of the utility model can observe the exact wavelength offset of the spectrometer at all wavelength positions, thereby accurately calibrating the full waveband;
2. the spectral line distribution condition of the wavelength standard light source can be designed by selecting the parameters of the optical etalon, the position and the distribution density of the spectral line can be changed by changing the temperature, the inclination angle and the like of the optical etalon, and the device has the function of calibrating the spectral line in real time and can meet the calibration requirements of different types of spectrometers;
3. the utility model discloses the even characteristics of application optical etalon spectral line distribution makes it have unique advantage on the raman displacement calibration of raman spectroscopy appearance, because the frequency interval of optical etalon spectral line equals, therefore the raman displacement between the spectral line will strictly equal on the raman spectrogram, combines raman standard sample, also can calibrate raman displacement under the condition that does not carry out wavelength (or absolute wave number) correction.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the spectral structure generated by the embodiment of the present invention.
Reference numerals: the wide-spectrum light source comprises a wide-spectrum light source 1, an achromatic lens pair 2, a pinhole 3, a first collimating lens 4, an optical etalon 5, an atomic spectral line light source 6, a second collimating lens 7 and a semi-reflecting and semi-transmitting beam splitter 8.
Detailed Description
In order to make the technical problem, technical solution and beneficial effects to be solved by the present invention clearer and more obvious, the following description is made in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the embodiment of the present invention includes a wide spectrum light source 1, an achromatic lens pair 2, a pinhole 3, a first collimating lens 4, an optical etalon 5, an atomic spectrum light source 6, a second collimating lens 7, and a semi-reflective and semi-transparent beam splitter 8; the wide spectrum light source, the achromatic lens pair, the pinhole, the first collimating lens and the optical etalon are coaxially arranged, the semi-reflecting and semi-transmitting beam splitter is obliquely arranged, and the second collimating lens and the atomic spectral line light source are sequentially coaxially arranged below the semi-reflecting and semi-transmitting beam splitter.
The working principle of the utility model is as follows:
the wide-spectrum light source 1 emits continuous-spectrum light, the light is focused on the pinhole 3 through the achromatic lens pair 2, light beams after spatial filtering of the pinhole 3 are collimated through the first collimating lens 4 and then enter the optical etalon 5, and the spectrum of the light beams is changed into comb-shaped spectral lines from the continuous spectrum through comb-shaped filtering of the optical etalon 5; the atomic spectral line light source 6 emits an atomic spectral line with a known wavelength value, and after being collimated by the second collimating lens 7, the atomic spectral line light source is combined with the comb-shaped spectral line light beam through the semi-reflecting and semi-transmitting beam splitter 8 to finally form the light beam with the spectral shape of the comb-shaped spectral line mixed atomic spectral line.
The utility model discloses the wavelength real-time calibration method of pectination spectral line as follows:
use the spectrum appearance of treating the calibration to detect the utility model discloses a standard light source, in the spectrogram wavelength range that the spectrum appearance was gathered, the spectrogram includes a series of pectination spectral line { lambda1，λ2，λ3，…λn… and a plurality of atomic spectral lines, two of which are arbitrarily chosen to be marked as lambda, as shown in FIG. 2a1、λa2And finding out the comb-shaped spectral line closest to the two atomic spectral lines as lambdan1、λn2Code of said spectral line λa1、λa2、λn1、λn2The represented wavelength values are all measured values measured by a spectrometer to be calibrated;
the two selected measurements are λa1、λa2Has an actual value of
The measured value is λn1、λn2The actual values of the comb lines of (a) may be expressed as:
since the frequency spacing of the comb lines is exactly equal, the difference in spacing between the inverses of the wavelengths of the lines is equalThus λ for the nth (any) measurement in the spectrogramnActual value of the comb line
Satisfies the following relation:
wherein n1 and n2 are comb lines λ respectivelyn1And λn2The serial number of (a);
by combining the above equations (1), (2) and (3), the actual value of the nth comb line can be derived as:
by the calibration method, the exact wavelength value of each spectral line at the measuring moment can be obtained in real time, and the uncertainty of the spectral line wavelength caused by the cavity length precision of the optical etalon and environmental factors is overcome, so that the full-band wavelength standard light source without the empty window is obtained. The full-band blank-window-free wavelength standard light source comprises a series of known spectral lines which are densely and uniformly distributed on a spectral axis, can accurately correct all wavelength positions of the spectral axis of a spectrometer, has a wide application prospect, and is particularly applied to the field of Raman spectroscopy.
Claims (2)
1. A full-band non-empty-window wavelength standard light source is characterized in that: the optical etalon comprises a wide-spectrum light source, an achromatic lens pair, a pinhole, a first collimating lens, an optical etalon, a semi-reflecting and semi-transmitting beam splitter, a second collimating lens and an atomic spectrum light source which are arranged in sequence; the wide-spectrum light source, the achromatic lens pair, the pinhole, the first collimating lens and the optical etalon are coaxially arranged, the semi-reflecting and semi-transmitting beam splitter is obliquely arranged, and the second collimating lens and the atomic spectral line light source are sequentially coaxially arranged below the semi-reflecting and semi-transmitting beam splitter;
the wide-spectrum light source is used for emitting continuous-spectrum light rays, the achromatic lens is used for refocusing the light rays emitted by the wide-spectrum light source, the pinhole is used for carrying out spatial filtering on the refocused light rays, the first collimating lens is used for collimating the light beams subjected to spatial filtering of the pinhole, and the optical etalon is used for aligning the straight light beams and carrying out comb-shaped filtering so as to enable the spectrum of the light beams to be changed into comb-shaped spectral lines from the continuous spectrum;
the atomic spectral line light source is used for emitting an atomic spectral line with a known wavelength value, and the second collimating lens is used for collimating the atomic spectral line light beam;
the semi-reflecting and semi-transmitting beam splitter is used for combining the atomic spectral line beam and the comb spectral line beam filtered by the optical etalon to obtain the beam with the spectral shape of the comb spectral line mixed atomic spectral line.
2. The full-band blank-window-free wavelength standard light source of claim 1, wherein: the semi-reflecting and semi-transmitting beam splitter is a semi-reflecting and semi-transmitting full-wave band beam splitter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921381212.3U CN210464664U (en) | 2019-08-23 | 2019-08-23 | Full-waveband blank-window-free wavelength standard light source |
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| CN201921381212.3U CN210464664U (en) | 2019-08-23 | 2019-08-23 | Full-waveband blank-window-free wavelength standard light source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411564A (en) * | 2019-08-23 | 2019-11-05 | 厦门大学 | A kind of all band is without the long standard sources of empty window wave and Wavelength calibration method |
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2019
- 2019-08-23 CN CN201921381212.3U patent/CN210464664U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411564A (en) * | 2019-08-23 | 2019-11-05 | 厦门大学 | A kind of all band is without the long standard sources of empty window wave and Wavelength calibration method |
| CN110411564B (en) * | 2019-08-23 | 2024-09-24 | 厦门大学 | Full-band non-hollow window wavelength standard light source and wavelength calibration method |
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