CN111913273A - Probe for tobacco leaf quality spectrum detection - Google Patents
Probe for tobacco leaf quality spectrum detection Download PDFInfo
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- CN111913273A CN111913273A CN201911325032.8A CN201911325032A CN111913273A CN 111913273 A CN111913273 A CN 111913273A CN 201911325032 A CN201911325032 A CN 201911325032A CN 111913273 A CN111913273 A CN 111913273A
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- 239000000523 sample Substances 0.000 title claims abstract description 40
- 238000001228 spectrum Methods 0.000 title claims abstract description 22
- 241000208125 Nicotiana Species 0.000 title claims abstract description 14
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 title description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 52
- 238000000701 chemical imaging Methods 0.000 abstract 1
- 230000004075 alteration Effects 0.000 description 14
- 238000003384 imaging method Methods 0.000 description 8
- 238000003331 infrared imaging Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003333 near-infrared imaging Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
- G01J2003/2826—Multispectral imaging, e.g. filter imaging
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
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- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
The utility model provides a special probe optical system of tobacco leaf spectrum which is by along the optical axis direction in proper order: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens; wherein the first and third lenses are negative power lenses; satisfies the following conditions:
wherein the equivalent focal length of the optical system of the probe is f; the focal length of the first lens is f1(ii) a The focal length of the third lens is f3(ii) a The D9 is a distance on the optical axis from the stop STO of the optical system to the image side of the fifth lens; the D10 is a distance D10 of the stop STO from the object side of the sixth lens L6. The optical system effectively improves the spectral imaging of near infrared light and reduces the effective focal length of the optical system; the object side surface of the first lens is set to be a concave surface, so that unnecessary contact with an object to be measured is avoided.
Description
Technical Field
The invention relates to the field of infrared spectrum detection, in particular to an optical probe structure especially used for tobacco leaf quality spectrum.
Background
The optical probe used at present is not optimized for the application field, especially for the spectral characteristic peak which may appear, and the optical probe does not have special optimization processing for a certain waveband from ultraviolet light to infrared light in order to adapt to the requirement of multiband detection. However, if the optimization process is not performed for a certain wavelength band, the chromatic aberration of the optical system is large. For example: when the detection light is visible light and infrared light, the chromatic aberration is large due to large wavelength difference; this results in blurring of the image at the focal plane, which results in a reduction in imaging resolution. Most of the existing detection probes are used for imaging spectrum and spectrum detection, and the imaging spectrum mostly takes into consideration the visible light spectrum, so that the chromatic aberration of the visible light waveband is optimized, and the chromatic aberration elimination processing is not specially carried out on the infrared waveband interval. Therefore, when such a probe is used for infrared band detection, large chromatic aberration often occurs, which affects the detection result. In addition, the existing probe, especially for the probe for spectrum detection, is often prepared into a convex structure on the first lens, which is the requirement of probe processing, so that more received laser can be collected; so that the stimulated light located at the edge region of the probe can be collected into the probe. However, the lens is protruded in this way, on one hand, the surface of the lens is easily exposed and damaged by collision, thereby affecting imaging; on the other hand, when a liquid is to be detected, the probe is as close as possible to the liquid to be detected, which increases the risk of contact with the liquid to be detected.
Disclosure of Invention
Aiming at the problems, the invention provides a probe which is an optical probe specially customized for the tobacco quality spectrum detection, fully considers the wavelength characteristic of the tobacco quality spectrum, and is an optical probe optimized for the characteristic peak of the tobacco quality spectrum; on the other hand, the optical probe disclosed by the invention has the advantages that the first mirror is a concave mirror, the NA (numerical aperture) of the optical probe is the same as that of a common probe through parameter design, and meanwhile, the risk of undesirable contact with an object to be measured is reduced.
An aspect of the present invention provides a probe optical system, which is composed of, in order in an optical axis direction: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens; wherein the first and third lenses are negative power lenses; satisfies the following conditions:
wherein the equivalent focal length of the optical system of the probe is f; the focal length of the first lens is f1(ii) a The focal length of the third lens is f3(ii) a The D9 is a distance on the optical axis from the stop STO of the optical system to the image side of the fifth lens; the D10 is a distance D10 of the stop STO from the object side of the sixth lens L6.
Preferably, the third lens is an aspherical lens.
Preferably, the object side surface of the first lens is a concave surface.
The invention has the advantages that:
1) the probe designed by the invention is particularly a lens with the optical design, which is a lens specially designed for a plurality of characteristic peaks appearing in the tobacco leaf quality spectrum detection link, and has good chromatic aberration improvement on the wavelengths corresponding to the characteristic peaks, so that the probe is favorable for performing real-time infrared imaging while performing spectrum detection. At present, probes have few detection items which are specially customized for a plurality of wavelengths, particularly for tobacco quality detection. The lens provided by the invention not only can be used for detecting the quality of the tobacco leaves with higher detection precision, but also can be used for effectively reducing chromatic aberration and is beneficial to infrared imaging.
2) The optical design of the invention improves the capability of increasing the collected light while ensuring chromatic aberration, namely, the numerical aperture is improved by reducing the total focal length of the probe optical system. This is particularly useful in the case of poor scattered light for quality detection of tobacco leaves.
3) The object side surface of the first lens is a concave surface, so that the risk that a convex surface is easy to be in unnecessary contact with liquid to be measured is avoided. And also with a larger numerical aperture, which does not give rise to concerns about the reduced ability to collect light for use with a concave surface.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of the structure of the optical lens of the probe of the present invention;
FIG. 2a is a chromatic aberration diagram of embodiment 1 of the present invention;
FIG. 2b is a graph of field curvature and distortion of example 1 of the present invention;
FIG. 3a is a chromatic aberration diagram of embodiment 2 of the present invention;
FIG. 3b is a graph of field curvature and distortion for example 2 of the present invention;
FIG. 4a is a chromatic aberration diagram of embodiment 3 of the present invention;
figure 4b is a graph of field curvature and distortion for example 3 of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Hereinafter, embodiments of the stimulated emission depletion micro-imaging device according to the present invention will be described in detail with reference to the drawings, and in the description of the drawings, the same elements will be denoted by the same reference numerals, and redundant description thereof will be omitted.
Typical absorption peaks of the absorption spectrum of the tobacco leaf comprise 1125nm, 1167nm, 1310nm, 1378nm, 1418nm, 1436nm, 1520nm and 1587 nm. The typical wave band of the tobacco leaf spectrum is 1100nm-1600 nm; that is, for the optical system of the probe, it receives near infrared light of 1100-1600 nm; the s light is set to be 1220nm, the d light is set to be 1350nm, and the p light is set to be 1480nm so as to conveniently optimize an optical system of the probe. The purpose of this optimization is to extend the near infrared imaging spectral capabilities of the probe in addition to detecting absorption spectra. Meanwhile, the optical system of the probe increases the numerical aperture as much as possible and reduces the equivalent focal length of the system, so that the probe can be close to an object to be detected as much as possible. Meanwhile, the object side curved surface of the first lens is set to be a concave surface so as to prevent unnecessary contact with an object to be measured.
Example 1:
the parameters of each optical lens of this example are detailed in table 1.
TABLE 1
Wherein the meanings of the symbols are as follows:
s1: entrance pupil position
R1: the radius of curvature of the object-side surface of the first lens L1;
r2: the radius of curvature of the image-side surface of the first lens L1;
r3: the radius of curvature of the object-side surface of the second lens L2;
r4: the radius of curvature of the image-side surface of the second lens L2;
r5: the radius of curvature of the object-side surface of the third lens L3;
r6: the radius of curvature of the image-side surface of the third lens L3;
r7: the radius of curvature of the object-side surface of the fourth lens (cemented lens) L4;
r8: the radius of curvature of the image-side surface of the fourth lens (cemented lens) L4;
r9: the radius of curvature of the image-side surface of the fifth lens (cemented lens) L5;
r10: a radius of curvature of the object side surface of the sixth lens L6;
r11: a radius of curvature of the image-side surface of the sixth lens L6;
r12: a radius of curvature of the object side surface of the seventh lens L7;
r13: a radius of curvature of the image-side surface of the seventh lens L7;
r14: a radius of curvature of the object side surface of the eighth lens L8;
r15: a radius of curvature of the image-side surface of the eighth lens L8;
r16: a radius of curvature of the object side surface of the ninth lens L9;
r17: a radius of curvature of the image-side surface of the ninth lens L9;
r18: a radius of curvature of the object side surface of the tenth lens L10;
r19: a radius of curvature of the image-side surface of the tenth lens L10;
r20: a radius of curvature of the object side surface of the eleventh lens L11;
r21: a radius of curvature of the image-side surface of the eleventh lens L11;
nd1 is the refractive index of the d light of the first lens;
nd2 is the refractive index of the d light of the second lens;
nd3 is the refractive index of d light of the third lens;
nd4 is the refractive index of d light of the fourth lens;
nd5 is the refractive index of d light of the fifth lens;
nd6 is the refractive index of d light of the sixth lens;
nd7 is the refractive index of d light of the seventh lens;
nd8 is the refractive index of d light of the eighth lens;
nd9 is the refractive index of d light of the ninth lens;
nd10 is the refractive index of d light of the tenth lens;
nd11 is the refractive index of d light of the eleventh lens;
vd Abbe number
V1 is the abbe number of the first lens;
v2 is the abbe number of the second lens;
v3 is the abbe number of the third lens;
v4 is the abbe number of the fourth lens;
v5 is the abbe number of the fifth lens;
v6 is the abbe number of the sixth lens;
v7 is the abbe number of the seventh lens;
v8 is the abbe number of the eighth lens;
v9 is the abbe number of the ninth lens;
v10 is the abbe number of the tenth lens;
v11 is the abbe number of the eleventh lens.
The third lens is an aspherical mirror, and the aspherical coefficient of the third lens is shown in the following table:
the present embodiment includes, in order from an object side to an image side in an optical axis direction, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, and an eleventh lens L11; the third lens is an aspheric lens.
TABLE 2
According to the aspheric image height formula:
where K is the conic coefficient, for surface R5, K5 is 1.301; for surface R6, K6 ═ 1.259. A4, a6, A8, a10, a12, a14, a16 aspheric coefficients;
the equivalent focal length f of the optical system is equal to1.535 cm. The object side surface of the first lens is a concave surface, the focal power of the first lens is negative, and the focal length f1 of the first lens is-1.205 cm;
the third lens is set to have negative focal power, a focal length f3 of-2.038 cm,
setting the distance D9 of the stop STO of the probe optical system to the image side of the fifth lens L5 to 1.136 cm; the distance D10 from the stop STO to the object side of the sixth lens L6 is 0.301 cm. Then
The color difference at each incident angle in example 1 is shown in fig. 2 a. It can be seen from fig. 2a that by setting the third lens as an aspherical mirror, and setting the aperture position parameter and the parameter of the first lens, the axial chromatic aberration under each incident angle is effectively improved.
Distortion and curvature of field of this embodiment 1 are shown in fig. 2b, and the curvature of field including distortion and the curvature of field of the optical axis region are within an acceptable range, except that the curvature of field is large at a position away from the optical axis. But for the infrared imaging spectrum, the distortion of the infrared imaging spectrum at a position far away from the optical axis position area is larger, but the imaging resolution is not influenced.
Example 2
The parameters of each optical lens of this example are detailed in table 3.
TABLE 3
The letter meanings used in Table 3 are the same as those of example 1.
The 3 rd lens is an aspherical mirror, and the aspherical coefficients of the lens are shown in the following table:
TABLE 4
The present embodiment includes, in order from an object side to an image side in an optical axis direction, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, a tenth lens L10, and an eleventh lens L11; the third lens is an aspheric lens.
According to the aspheric image height formula:
where K is the conic coefficient, for surface R5, K5 ═ 1.418; for surface R6, K6 ═ 1.134. A4, a6, A8, a10, a12, a14, a16 are aspheric coefficients.
The equivalent focal length f of the optical system is 1.521 cm. The object side surface of the first lens is a concave surface, the focal power of the first lens is negative, and the focal length f1 of the first lens is-1.176 cm;
the focal power of the third lens is set to be negative, the focal length f3 is-1.944 cm,
setting the distance D9 of the stop STO of the probe optical system to the image side of the fifth lens L5 to 1.162 cm; the distance D10 from the stop STO to the object side of the sixth lens L6 is 0.328 cm. Then
The color difference at each incident angle in this example 2 is shown in the figure. It can be seen from fig. 3a that by setting the third lens as an aspherical mirror, and setting the aperture position parameter and the parameter of the first lens, the axial chromatic aberration under each incident angle is effectively improved.
The distortion and curvature of field of this example 2 are shown in fig. 3b, and the curvature of field including the distortion and the optical axis region is within an acceptable range except that the curvature of field is large at a position away from the optical axis. But for the infrared imaging spectrum, the distortion of the infrared imaging spectrum at a position far away from the optical axis position area is larger, but the imaging resolution is not influenced.
Example 3
The parameters of each optical lens of this example are detailed in table 5.
TABLE 5
The 3 rd lens is an aspherical mirror, and the aspherical coefficient of the lens is shown in table 6:
TABLE 6
According to the aspheric image height formula:
where K is the conic coefficient, for surface R5, K5 ═ 1.538; for surface R6, K6 ═ 1.170. A4, a6, A8, a10, a12, a14, a16 are aspheric coefficients.
The equivalent focal length f of the optical system is 1.473 cm. Object side surface of the first lensThe first lens is concave, the focal power of the first lens is negative, and the focal length f1 is-1.184 cm;
the focal power of the third lens is set to be negative, the focal length f3 is-1.926 cm,
setting the distance D9 of the stop STO of the probe optical system to the image side of the fifth lens L5 to 1.104 cm; the distance D10 from the stop STO to the object side of the sixth lens L6 is 0.321 cm. Then
The color difference at each incident angle in this example 3 is shown in the figure. It can be seen from fig. 4a that by setting the third lens as an aspherical mirror, and setting the aperture position parameter and the parameter of the first lens, the axial chromatic aberration under each incident angle is effectively improved.
The distortion and curvature of field of this example 3 are shown in fig. 4b, and the curvature of field including the distortion and the optical axis region is within an acceptable range except that the curvature of field is large at a position away from the optical axis. But for the infrared imaging spectrum, the distortion of the infrared imaging spectrum at a position far away from the optical axis position area is larger, but the imaging resolution is not influenced.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
Claims (3)
1. The utility model provides a special probe optical system of tobacco leaf spectrum which is by along the optical axis direction in proper order: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens; wherein the first and third lenses are negative power lenses; satisfies the following conditions:
wherein the equivalent focal length of the optical system of the probe is f; the focal length of the first lens is f1(ii) a The focal length of the third lens is f3(ii) a The D9 is a distance on the optical axis from the stop STO of the optical system to the image side of the fifth lens; the D10 is a distance D10 of the stop STO from the object side of the sixth lens L6.
2. The probe of claim 1, said third lens being an aspheric lens.
3. The probe of claims 1-2, the object side surface of the first lens being concave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325032.8A CN111913273A (en) | 2019-12-20 | 2019-12-20 | Probe for tobacco leaf quality spectrum detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325032.8A CN111913273A (en) | 2019-12-20 | 2019-12-20 | Probe for tobacco leaf quality spectrum detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116449542A (en) * | 2023-06-15 | 2023-07-18 | 武汉大学 | Large-view-field high-precision ultraviolet imaging lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116449542A (en) * | 2023-06-15 | 2023-07-18 | 武汉大学 | Large-view-field high-precision ultraviolet imaging lens |
| CN116449542B (en) * | 2023-06-15 | 2023-09-15 | 武汉大学 | Large-view-field high-precision ultraviolet imaging lens |
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