CN216208569U - Spectrum detection device - Google Patents
Spectrum detection device Download PDFInfo
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- CN216208569U CN216208569U CN202122395287.0U CN202122395287U CN216208569U CN 216208569 U CN216208569 U CN 216208569U CN 202122395287 U CN202122395287 U CN 202122395287U CN 216208569 U CN216208569 U CN 216208569U
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Abstract
The application provides a spectrum detection device, and the spectrum detection device can detect the spectrum information of a substance to be detected. The device comprises a shell (1), a parallel light source, a photoelectric detector (11) and a reflector or a refractor. The parallel light source can form a plurality of parallel light beams with the same light intensity, and the parallel light beams comprise measuring light beams capable of passing through the substance to be measured and reference light beams not capable of passing through the substance to be measured. The paths of the measuring beam and the reference beam can be changed by the mirror or the refractor. The photodetector (11) comprises two detection regions, and the measuring beam and the reference beam can respectively enter the two detection regions of the photodetector (11) through the reflector or the refractor.
Description
Technical Field
The application belongs to a spectrum detection device, and particularly relates to a spectrum detection device.
Background
In an application scenario of the spectrum detection apparatus, in order to obtain an absorption spectrum of an object to be detected, a "reference beam", that is, a spectrum of a light beam directly emitted from a light source, and a "measurement beam", that is, a spectrum of a light beam emitted from the light source after passing through a sample to be detected, need to be measured.
In order to realize the above functions, the conventional detection device has two detection modes: firstly, a light beam switching device is adopted to inject the two light beams into a spectrometer in a time-sharing manner for detection; and secondly, two spectrometers are adopted to simultaneously detect the two light beams respectively.
Both of these solutions have certain drawbacks. In the first scheme, because the light beam switching device is adopted and time-sharing measurement is carried out, the measurement precision is deteriorated due to the light intensity fluctuation of the light source, and the reliability of the device is reduced due to the fact that the switching device is not switched in place. The second solution, which uses two spectrometers, directly results in increased costs and larger device size. Meanwhile, the requirement of the consistency of the responses of the two spectrometers can also influence the long-term stability of the detection device.
SUMMERY OF THE UTILITY MODEL
Based on the problems mentioned in the background, the present application provides a spectral detection apparatus.
The application provides a spectrum detection device can detect the spectral information of the material that awaits measuring, spectrum detection device includes:
a housing;
the parallel light source can form parallel light beams, and the parallel light beams comprise measuring light beams capable of passing through the substance to be detected and reference light beams not capable of passing through the substance to be detected;
a mirror or refractor by which the paths of the measuring beam and the reference beam can be changed; and
a photodetector comprising two detection regions,
the measuring beam and the reference beam can be respectively incident on the two detection areas of the photoelectric detector through the reflecting mirror or the refracting mirror.
In at least one embodiment, the collimated light source includes a light emitting part and an optical part through which light emitted from the light emitting part can form the collimated light flux.
In at least one embodiment, the collimated light source includes a single polychromatic light source and a convex lens through which light emitted by the polychromatic light source can pass to form the parallel light beams.
In at least one embodiment, the parallel light source includes a single complex color light source and a concave mirror, the complex color light source is disposed at a focal position of the concave mirror, and light emitted by the complex color light source is reflected by the concave mirror to form the parallel light beam.
In at least one embodiment, the housing has a recess capable of containing the substance to be measured,
the spectrum detection device comprises a first light-transmitting window and a second light-transmitting window which are fixed at two ends of the depressed part, wherein the first light-transmitting window and the second light-transmitting window can transmit light and block substances to be detected in the depressed part to enter the spectrum detection device.
In at least one embodiment, the photodetector is a complementary metal oxide semiconductor image sensor or a charge coupled device image sensor loaded with quantum dots having a spectral response range that includes ultraviolet to near infrared.
In at least one embodiment, the photodetector includes:
a first region and a second region having the same spectral filtering array; and
an opaque band formed or disposed between the first region and the second region,
the opaque band can separate the first region and the second region.
In at least one embodiment, the opaque band includes opaque protrusions and/or light baffles.
In at least one embodiment, the mirror comprises a first mirror and a second mirror,
the bulge is formed or arranged between the first area and the second area, the light barrier is attached on the bulge,
the measuring beam and the reference beam are separated in a first direction on at least part of the optical path, and the light barrier is located between the first reflecting mirror and the second reflecting mirror in a second direction perpendicular to the first direction, so that the measuring beam and the reference beam are prevented from interfering with each other.
In at least one embodiment, the mirror is a flat mirror, or a concave cylindrical mirror, or a concave spherical mirror.
In at least one embodiment, the spectral detection apparatus comprises an optical stop comprising a first optical stop, a second optical stop, and a third optical stop,
the first diaphragm comprises two light through holes for the measuring beam and the reference beam to pass through respectively, the second diaphragm and the third diaphragm are respectively provided with one light through hole,
the measuring beam can sequentially pass through the first diaphragm and the second diaphragm, and the reference beam can sequentially pass through the first diaphragm and the third diaphragm.
In at least one embodiment, the mirror comprises a first mirror and a second mirror,
the measuring beam can sequentially pass through the first diaphragm and the second diaphragm to reach the first reflector,
the reference beam can sequentially pass through the first diaphragm and the third diaphragm to reach the second reflecting mirror.
In at least one embodiment, the measurement beam and the reference beam are spaced apart in a first direction, over at least part of the optical path, in a second direction perpendicular to the first direction,
the second diaphragm is located between the first mirror and the first diaphragm,
the third diaphragm is located between the second mirror and the first diaphragm,
the second mirror is positioned between the second diaphragm and the first mirror.
The spectrum detection device provided by the application utilizes the parallel light source to form the reference light beam and the measuring light beam through the light path design, so that errors caused by light source light intensity fluctuation of a time-sharing measuring scheme and reliability problems caused by light path switching can be eliminated; compared with the scheme of simultaneously applying two spectrometers, the method and the device have the advantages that the requirement of response consistency of the two spectrometers is eliminated, and the size of the detection device can be more compact.
Drawings
Fig. 1 shows a schematic structural diagram of a spectrum detection apparatus according to an embodiment of the present application.
Fig. 2 shows a schematic diagram of a photodetector of a spectral detection apparatus according to an embodiment of the present application.
Description of the reference numerals
1, a shell; 2, a compound color light source; 3 a convex lens; 4 a first diaphragm; 5 a first light-transmitting window; 6 a second light-transmitting window; 7 a second diaphragm; 8 first water; 9 a third diaphragm; 10 a second mirror; 11a photodetector; 11a second region; 11b a first region; 11c an opaque band; 12 a light barrier; 13 a recessed portion;
a first direction; b a second direction.
Detailed Description
Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the present application, and is not intended to be exhaustive or to limit the scope of the application.
The present application provides a spectrum detecting device, as shown in fig. 1, the spectrum detecting device may include a housing 1, a collimated light source, a first diaphragm 4, a first light transmissive window 5, a second light transmissive window 6, a second diaphragm 7, a first reflecting mirror 8, a third diaphragm 9, a second reflecting mirror 10, and a photodetector 11.
The housing 1 may have a recess 13, the recess 13 being capable of accommodating a substance to be measured. Taking the spectrum detection of the water body sample as an example, in an embodiment of the present application, the spectrum detection apparatus may be directly placed in the water body environment, and the water body information is determined by detecting the water body sample at the depression 13. Alternatively, a sample cell isolated from the optical path and the electric circuit of the spectrum detection device but transmitting light can be disposed at the recess 13 for detecting a small amount of sample or detecting a chemical reaction process. In addition, the substance to be measured may be a substance placed in a container or flowing in a pipe. The container or pipe may be placed in or pass through the recess 13.
The collimated light source may include a light emitting part and an optical part, and light emitted from the light emitting part can form a collimated light beam through the optical part. The light source has the characteristics of single light source and multiple light beams, wherein the single light source refers to that the light source of the light emitting component for emitting incident light is single, and the light intensity of the incident light is the same; the multi-beam means that the parallel beams include at least a measuring beam that can pass through the substance to be measured and a reference beam that does not pass through the substance to be measured. The "parallel" of the parallel beams emphasizes that the measuring beam and the reference beam are incident on different positions of the photodetector 11 (described later) synchronously, and the measuring beam and the reference beam are parallel to each other without changing the optical path by a reflector or a refractor, rather than indicating that the measuring beam and the reference beam are parallel to each other in real time.
For convenience of description, the direction perpendicular to the parallel light beam of which the light path is not changed by the reflecting mirror or the refracting mirror on the cross section of the spectrum detection device is a first direction a, and the direction parallel to the parallel light beam of which the light path is not changed by the reflecting mirror or the refracting mirror is a second direction b.
The light emitting component can be a single polychromatic light source 2, the optical component can be a convex lens 3, and the polychromatic light source 2 can form parallel light beams through the convex lens 3. As shown in fig. 1, in the first direction a, the polychromatic light source 2 forms a measuring beam on the left and a reference beam on the right through the convex lens 3.
It will be appreciated that it is also possible to use a concave mirror (an example of an optical component, not shown in the figures) to obtain the parallel light beam, for example by placing the polychromatic light source 2 at the focal position of the concave mirror and reflecting the parallel light beam off the concave mirror. Further, the present application may also use a lens group or a spherical mirror to capture parallel light beams. The method of obtaining the parallel beam is not limited in this application.
The first light-transmitting window 5 and the second light-transmitting window 7 can be quartz windows, and the first light-transmitting window 5 and the second light-transmitting window 7 are fixedly connected to two ends of the concave part 13 of the shell 1. So that the measuring beam can pass through the first light-transmitting window 5, the substance to be measured (such as a water body sample) in the recess 13 and the second light-transmitting window 7 in sequence. A sealing device such as a sealing ring may be disposed at the joint of the light-transmitting window and the recess 13 to prevent the substance to be detected in the recess 13 from entering the spectrum detection device.
The first diaphragm 4 comprises two light-passing apertures through which the measuring and reference beams pass, respectively, and the second diaphragm 7 and the third diaphragm 9 each have one light-passing aperture. The diaphragm can increase the number of reflections required for stray light to reach the photodetector 11 (the light intensity attenuates by more than 90% per reflection of stray light), and increase the distance from stray light to the photodetector 11 (according to the inverse square law of the light intensity, the longer the distance, the weaker the light intensity of stray light). Namely, the light intensity of the stray light can be weakened to a certain extent by using the diaphragm, and the interference on the measuring beam and the reference beam is reduced.
The first mirror 8 and the second mirror 10 may be plane mirrors, or concave cylindrical mirrors, or concave spherical mirrors.
It will be appreciated that instead of a mirror, a refractive mirror may be used, for example, to place the photodetector at the lower end of the second direction b, and that the environment may also be spectrally detected by refracting the measuring and reference beams through the refractive mirror into the detection region (described later) of the photodetector 11.
As shown in fig. 2, the photodetector 11 may be a CMOS (complementary metal oxide semiconductor) image sensor or a CCD (charge coupled device) image sensor loaded with quantum dots, and preferably, the quantum dot portion has a relatively wide spectral response range, and can cover a range from ultraviolet (wavelength 400nm to 10nm) to near infrared (wavelength 780 to 2526 nm). The photodetector 11 includes at least two detection regions, and in one embodiment of the present application, the photodetector 11 includes a first region 11b and a second region 11a having the same spectral filtering array. The measuring beam can enter the first region 11b of the photodetector 11 through the first aperture 4, the recess 13, the second aperture 7, and the first mirror 8 in this order. The reference beam can sequentially enter the first aperture 4, the third aperture 9, and the second mirror 10 to be incident on the second region 11a of the photodetector 11.
Further, the spectrum detecting apparatus may further include an opaque band 11c, and the opaque band 11c is an opaque protrusion formed or disposed between the first region 11b and the second region 11 a. The protrusion can separate the first region 11b and the second region 11a to prevent the measuring beam and the reference beam from causing crosstalk influence on different detection regions of the photodetector 11, and improve respective signal-to-noise ratios, thereby improving accuracy.
The spectral detection means may also comprise a light barrier 12. In the second direction b, a light barrier 12 is arranged between the first mirror 8 and the second mirror 10 to prevent mutual interference of the measuring beam and the reference beam. One end of the light-blocking panel 12 may be attached to the light-impermeable tape 11 c. In one embodiment, the opaque strip 11c is an opaque glue to which the light barrier 12 is glued. It will be appreciated that the opaque strips 11c may also be protrusions formed of other opaque materials, and the light barrier may also be secured in place by bolts or the like.
In one embodiment, the first mirror 8 is located on the downward side of the second diaphragm 7 in the second direction b (i.e. the second diaphragm 7 is located between the first mirror 8 and the first diaphragm 4 in the second direction b), and the second mirror 10 is located on the downward side of the third diaphragm 9 (i.e. the third diaphragm 9 is located between the second mirror 10 and the first diaphragm 4 in the second direction b). The angle of clockwise rotation of the light-reflecting surface of the first mirror 8 to the second direction b (vertical direction) is greater than 45 °. The angle of clockwise rotation of the reflective surface of the second mirror 10 to the second direction b is less than 45 deg.. The arrangement mode can reduce the mutual crosstalk between the measuring beam and the reference beam and reduce stray light.
Referring to fig. 1, in the second direction b, the second mirror 10 is preferably located between the second diaphragm 7 and the first mirror 8. The light beams reflected from the first mirror 8 and the second mirror 10 are preferably incident on the photodetector 11 approximately perpendicularly to the photodetector 11. Preferably, the angle between the light beam reflected from the first mirror 8 and the light beam reflected from the second mirror 10 is less than 90 degrees, more preferably less than 60 degrees, still more preferably less than 45 degrees.
It is understood that the angle of the first mirror 8 and the second mirror 10 and the angle between the light beams substantially reflect the distance between the first mirror 8 and the second mirror 10 and the photodetector 11. In the above-mentioned preferred embodiment, the distance between the reflecting mirror and the photodetector 11 is relatively long, and the stray light incident on the second region 11a due to the first reflecting mirror 8 is relatively weak with the stray light incident on the first region 11b due to the second reflecting mirror 10, so that the influence of the stray light can be reduced.
It is to be understood that the present application is not limited to the specific arrangement of the mirror or refractor, the angle, position, etc. of the photodetector 11.
The spectrum detection device provided by the application can reduce the intensity fluctuation of the light source, reduce the fluctuation of the final measurement result caused by the change of the performance of the detector along with the time, and effectively improve the short-term measurement precision, the long-term stability and the reliability of the water quality spectrum detection device. And compared with the scheme using two spectrometers, the volume of the device is reduced.
While the foregoing is directed to the preferred embodiment of the present application, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the application.
Claims (11)
1. A spectrum measuring apparatus capable of measuring spectrum information of a substance to be measured,
the spectrum detection device comprises:
a housing;
the parallel light source can form parallel light beams, and the parallel light beams comprise measuring light beams capable of passing through the substance to be detected and reference light beams not capable of passing through the substance to be detected;
a mirror or refractor by which the paths of the measuring beam and the reference beam can be changed; and
a photodetector comprising two detection regions,
the measuring beam and the reference beam can be respectively incident on the two detection areas of the photoelectric detector through the reflecting mirror or the refracting mirror.
2. The spectral detection apparatus according to claim 1,
the parallel light source comprises a light-emitting part and an optical part, and light emitted by the light-emitting part can pass through the optical part to form the parallel light beams.
3. The spectral detection apparatus according to claim 1,
the housing has a recess capable of containing the substance to be measured,
the spectrum detection device comprises a first light-transmitting window and a second light-transmitting window which are fixed at two ends of the depressed part, wherein the first light-transmitting window and the second light-transmitting window can transmit light and block substances to be detected in the depressed part to enter the spectrum detection device.
4. The spectral detection apparatus according to claim 1,
the photoelectric detector is a complementary metal oxide semiconductor image sensor or a charge coupled device image sensor loaded with quantum dots, and the spectral response range of the quantum dots is from ultraviolet rays to near infrared rays.
5. The spectral detection apparatus according to claim 1,
the photodetector includes:
a first region and a second region having the same spectral filtering array; and
an opaque band formed or disposed between the first region and the second region,
the opaque band can separate the first region and the second region.
6. The spectral detection apparatus according to claim 5,
the opaque band includes opaque protrusions and/or light barriers.
7. The spectral detection apparatus according to claim 6,
the mirrors include a first mirror and a second mirror,
the bulge is formed or arranged between the first area and the second area, the light barrier is attached on the bulge,
the measuring beam and the reference beam are separated in a first direction on at least part of the optical path, and the light barrier is located between the first reflecting mirror and the second reflecting mirror in a second direction perpendicular to the first direction, so that the measuring beam and the reference beam are prevented from interfering with each other.
8. The spectral detection apparatus according to claim 1,
the reflector is a plane reflector, or a concave cylindrical reflector, or a concave spherical reflector.
9. The spectral detection apparatus according to claim 1,
the spectrum detection device comprises diaphragms which comprise a first diaphragm, a second diaphragm and a third diaphragm,
the first diaphragm comprises two light through holes for the measuring beam and the reference beam to pass through respectively, the second diaphragm and the third diaphragm are respectively provided with one light through hole,
the measuring beam can sequentially pass through the first diaphragm and the second diaphragm, and the reference beam can sequentially pass through the first diaphragm and the third diaphragm.
10. The spectral detection apparatus according to claim 9,
the mirrors include a first mirror and a second mirror,
the measuring beam can sequentially pass through the first diaphragm and the second diaphragm to reach the first reflector,
the reference beam can sequentially pass through the first diaphragm and the third diaphragm to reach the second reflecting mirror.
11. The spectral detection apparatus according to claim 10,
the measurement beam and the reference beam are separated in a first direction on at least part of the optical path, in a second direction perpendicular to the first direction,
the second diaphragm is located between the first mirror and the first diaphragm,
the third diaphragm is located between the second mirror and the first diaphragm,
the second mirror is positioned between the second diaphragm and the first mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122395287.0U CN216208569U (en) | 2021-09-30 | 2021-09-30 | Spectrum detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122395287.0U CN216208569U (en) | 2021-09-30 | 2021-09-30 | Spectrum detection device |
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| Publication Number | Publication Date |
|---|---|
| CN216208569U true CN216208569U (en) | 2022-04-05 |
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| CN202122395287.0U Active CN216208569U (en) | 2021-09-30 | 2021-09-30 | Spectrum detection device |
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| CN (1) | CN216208569U (en) |
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- 2021-09-30 CN CN202122395287.0U patent/CN216208569U/en active Active
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