CN103940512B - A kind of polarization adjusting process for dual detector direct current Zeeman atomic absorption and device - Google Patents
A kind of polarization adjusting process for dual detector direct current Zeeman atomic absorption and device Download PDFInfo
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- CN103940512B CN103940512B CN201410136156.2A CN201410136156A CN103940512B CN 103940512 B CN103940512 B CN 103940512B CN 201410136156 A CN201410136156 A CN 201410136156A CN 103940512 B CN103940512 B CN 103940512B
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- atomic absorption
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Abstract
The invention discloses a kind of polarization adjusting process for dual detector direct current Zeeman atomic absorption and device, the program utilizes one around the devating prism of central axis, adjustment light source is separated, the polarised light that plane of polarization rotates with devating prism is allowed to enter exit slit, and separately remaining polarised light along the optical axis of Atomic absorption；Two photomultipliers in dual detector are respectively obtained in sinusoidal wave optical signal, further according to the optical signal of two sine waves to dual detector direct current Zeeman atomic absorption optical adjustment so that the optical signal the lowest point of two sine waves is zero.The present invention can carry out accurate adjustment to the polarization of light during dual detector direct current Zeeman atomic absorption, it is ensured that the accuracy of testing result.
Description
Technical field
The present invention relates to a kind of Zeeman atomic absorption technology, be specifically related to the polarization Calibration Technology of Zeeman atomic absorption.
Background technology
Atomic Absorption Spectrometer is very high in the popularity rate of China, and one of its reason is exactly the domestic condition possessing very early and producing Atomic absorption instrument, has many enterprises can produce Atomic absorption instrument.In recent years, external many apparatus manufactures start to set up at home Sole Proprietorship, produce Atomic absorption instrument, with domestic instrument manufacturing competition among enterprises.Therefore, while focusing on instrument quality, develop the distinctive high-end Atomic Absorption Spectrometer of tool and be particularly important.
High-end Atomic Absorption Spectrometer is primarily referred to as Zeeman AAS instrument and continuum source atomic absorption spectrometer.Although having had very long history from the Atomic Absorption Spectrometer of Hitachi, Ltd's production First Zeemen effect correcting background in 1976, but because the topmost spectra1 interfer-of atomic absorption spectrography (AAS) is molecule absorption and light scattering, and Zeeman background correction is the method that can preferably solve this interference；Further, since its dual-beam characteristic, good signal to noise ratio can be obtained in flame and graphite furnace analysis, be constantly subjected to the favor of vast analysis worker.
The Chinese patent of notification number CN1270174C (patent No. ZL200410026878.9) discloses method and the device thereof of a kind of stationary magnetic field anti-Zeemen effect atomic absorption analysis, the patent provides a kind of D.C. magnetic field Zeeman background correction light channel structure design, thus can form dual detector direct current Zeeman background correction atomic absorption unit or instrument, its from tradition Zeeman atomic absorption unlike Zeeman background correction after exit slit and devating prism, employ two photoelectric detectors, " background correction simultaneously " (seeing Fig. 5) can be carried out.
Whether the key technology for the performance of dual detector Zeeman atomic absorption instrument is: be parallel to magnetic field can be completely separable with two polarised lights being perpendicular to magnetic field, shine respectively on two detectors.
But the dual detector direct current Zeeman background correction device in existing dual detector Zeeman atomic absorption instrument cannot carry out effective adjustment to its light path in use, completely separable to guarantee two polarised lights being parallel to magnetic field with being perpendicular to magnetic field, and correspondence shines on two detectors, thus testing result is caused to there is bigger deviation.
As can be seen here, how the polarization of adjustment dual detector direct current Zeeman atomic absorption is that this area needs the problem solving badly.
Content of the invention
For the not high problem of existing dual detector direct current Zeeman atomic absorption accuracy of detection, it is an object of the invention to provide a kind of polarization adjusting process for dual detector direct current Zeeman atomic absorption, to realize the polarization adjustment to dual detector direct current Zeeman atomic absorption, it is ensured that accuracy of detection.
Another object of the present invention is to, a kind of polarization calibration apparatus for dual detector direct current Zeeman atomic absorption is provided.
In order to achieve the above object, the present invention adopts the following technical scheme that:
A kind of polarization adjusting process for dual detector direct current Zeeman atomic absorption, described adjusting process utilizes one around the devating prism of central axis, adjustment light source is separated, the polarised light that plane of polarization rotates with devating prism is allowed to enter exit slit, and separately remaining polarised light along the optical axis of Atomic absorption；Two photomultipliers in dual detector are respectively obtained in sinusoidal wave optical signal, further according to the optical signal of two sine waves to dual detector direct current Zeeman atomic absorption optical adjustment so that the optical signal the lowest point of two sine waves is zero.
In the preferred embodiment of adjusting process, said two optical signal phase difference 180 degree.
Further, when described devating prism drives the plane of polarization of the polarised light entering exit slit to rotate, when plane of polarization is perpendicular to magnetic direction, the polarised light entering exit slit fully enters the first photomultiplier, and the optical signal that the second photomultiplier detects is zero；When plane of polarization is parallel to magnetic direction, the polarised light entering exit slit should fully enter the second photomultiplier, and the optical signal that the first photomultiplier detects is zero.
As the second object of the present invention, a kind of polarization calibration apparatus for dual detector direct current Zeeman atomic absorption, this device includes:
Hollow motor；
Devating prism, described devating prism is coaxially disposed in the sleeve rotor of hollow motor；
Light source, the exit slit of the central axial alignment dual detector Zeeman atomic absorption by the devating prism in placed coaxial hollow motor for the described light source, and overlap with Atomic absorption optical axis.
In the preferred embodiment of polarization calibration apparatus, described devating prism is Romania and Hungary's prisms.
Further, described light source is laser instrument.
Accurate adjustment can be carried out to the polarization of light during dual detector direct current Zeeman atomic absorption according to the polarization adjusting process that such scheme is formed, it is ensured that the accuracy of testing result.
Meanwhile, this polarization calibration apparatus simple in construction, it is easy to accomplish.
Brief description
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structure principle chart of the present invention；
Fig. 2 is Romania and Hungary's prism schematic diagrames；
Fig. 3 is the assembling schematic diagram of hollow motor and Romania and Hungary's prism；
Fig. 4 is the cross sectional representation of Fig. 3；
Fig. 5 is the light path schematic diagram of dual detector direct current Zeeman background correction device in dual detector Zeeman atomic absorption；
Fig. 6 is for using the schematic diagram of present invention gained signal on two detectors.
Detailed description of the invention
In order to make the present invention realize technological means, creation characteristic, reach purpose and be easy to understand with effect, below in conjunction with being specifically illustrating, the present invention is expanded on further.
Seeing Fig. 5, it show the light path schematic diagram of dual detector direct current Zeeman background correction in dual detector direct current Zeeman atomic absorption instrument.As seen from the figure, whole background correction optical routing exit slit S, double Wo Lasite prism P, spherical reflector M1, triangular mirror M2, the first photomultiplier PMT1, the second photomultiplier PMT2 coordinate composition by light path as shown in Figure 5.
Thus, the polarised light being perpendicular to magnetic field in Zeeman atomic absorption and being parallel to magnetic direction is entering in this light path by exit slit S, and radiation of light source is become P by the polarizer (i.e. double Wo Lasite prism P) first installed by exit slit S||And P⊥Two bundle polarised lights, are directed respectively into the first photomultiplier PMT1 and the second photomultiplier PMT2.
But when actually used, optics (double Wo Lasite prism P, spherical reflector M1, triangular mirror M2, the first photomultiplier PMT1, the second photomultiplier PMT2) in these light paths, it is unable to reach the mated condition of standard, thus cause Zeeman atomic absorption detection to there is error.
Therefore in use, it is necessary to adjustment is carried out to the polarization of dual detector direct current Zeeman atomic absorption.
Thus, the present invention utilizes one around the devating prism of central axis, separates adjustment light source, allows the polarised light that plane of polarization rotates with devating prism enter exit slit, and separately remaining polarised light along the optical axis of Atomic absorption；Two photomultipliers in dual detector are respectively obtained in sinusoidal wave optical signal, further according to the optical signal of two sine waves to dual detector direct current Zeeman atomic absorption optical adjustment so that the optical signal the lowest point of two sine waves is zero.
Seeing Fig. 1, it show the structural representation of the polarization calibration apparatus being formed based on above-mentioned principle.This polarization calibration apparatus can carry out adjustment accurately and fast to the polarization of dual detector direct current Zeeman atomic absorption instrument, it is ensured that graceful Atomic absorption accuracy of detection.
As seen from the figure, whole calibration apparatus mainly includes light source the 1st, hollow motor 2 and devating prism 3 three part.
Hollow motor 2, as the power part of whole device, is used for driving devating prism 3 to rotate.The rotor axis of this hollow motor is hollow, and rotor after powered up can be around its axis rotation (seeing Fig. 3 and Fig. 4).
Devating prism 3 is used for separating adjustment light source, forms satisfactory polarised light.Shown in Fig. 2, this devating prism 3 specifically uses Romania and Hungary's prism, and the polarized radiation separating through this prism wherein has a branch of direction of propagation identical with the direction of propagation of incident light.
See Fig. 3 and Fig. 4, this devating prism 3 (i.e. Romania and Hungary's prism) is specifically coaxially disposed in the sleeve rotor of hollow motor, the prism 3 that i.e. shakes is placed in the sleeve rotor of hollow motor, and the central shaft of the prism 3 that shakes overlaps with the central shaft (being also the axle center of hollow motor) of sleeve rotor, when so hollow motor rotates, devating prism 3 can be driven around central axis, it is identical with incident beam that exit direction at devating prism 3 just can obtain a direction of propagation, the polarised light that plane of polarization rotates again together with hollow motor.
Light source 1 is used for producing adjustment light beam, and it specifically can use laser instrument, but is not limited to this, may be used without the light source of other structures equally.
When concrete cooperation, this light source 1 is positioned at the light incident side being placed in devating prism 3 in hollow motor 2, and the exit slit S of axle center (the namely central shaft of devating prism) the alignment dual detector Zeeman atomic absorption of light source 1 and hollow motor, and overlap (seeing Fig. 1) with Atomic absorption optical axis.
See Fig. 1, polarization calibration apparatus according to such scheme formation is in use, point bright light source 1, light source luminescent is along direction in figure (central axis direction of devating prism), devating prism 3 in hollow motor 2, is pointed into the exit slit S of dual detector Zeeman atomic absorption instrument, by the centrifugation of devating prism 3, devating prism 3 by a part of polarised light identical with incident beam for the direction of propagation along Atomic absorption optical axis enter exit slit S, another part is separated.When hollow motor rotates, the plane of polarization of the polarised light entering exit slit rotates with hollow motor.
When plane of polarization (i.e. entering the plane of polarization of the polarised light of exit slit) is perpendicular to magnetic direction (being perpendicular to paper direction in Fig. 1), the polarised light entering exit slit should all be separated by devating prism P, and enter PMT1, and the optical signal that PMT2 detects is zero；When plane of polarization is parallel to magnetic direction (being parallel to paper direction in Fig. 1), the polarised light entering exit slit should all be separated by devating prism P, and enters PMT2, and the optical signal that PMT1 detects is zero.
Devating prism 3 is when rotating with hollow motor, and two photomultipliers PMT1, PMT2 will obtain sinusoidal wave optical signal as shown in Figure 6.The two signal phase difference 180 degree, whether, when a PMT optical signal is for when maximum, another PMT optical signal is minimum (valley), can be zero to realize to dual detector Zeeman atomic absorption optical adjustment by observing this valley.
Observe this two paths of signals by oscillograph, or calculate the virtual value of signal, whether the lowest point that may determine that shown signal is zero: if the lowest point of two paths of signals can be to zero, the polarised light indicating entry into exit slit S is separated by the devating prism P after exit slit completely, and the light path after prism adjusts completely correct；If the lowest point of measured signal is not zero, that is accomplished by checking devating prism P, or the position of adjustment M1, M2, until the lowest point of two photomultiplier gained signals reaches zero.
By above-mentioned scheme, the present invention very convenient can carry out accurate adjustment to the polarization of light during dual detector direct current Zeeman atomic absorption by the polarization calibration apparatus of simple in construction, it is ensured that the accuracy of testing result.
General principle, principal character and the advantages of the present invention of the present invention have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; the principle that the present invention is simply described described in above-described embodiment and specification; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within scope of the claimed invention.Claimed scope is defined by appending claims and equivalent thereof.
Claims (6)
1. the polarization adjusting process for dual detector direct current Zeeman atomic absorption, it is characterised in that
Described adjusting process utilizes one around the devating prism of central axis, separates adjustment light source, allows polarization
The polarised light that face rotates with devating prism enters exit slit along the optical axis of Atomic absorption, and separately remaining is inclined
Shake light；Two photomultipliers in dual detector are made to respectively obtain in sinusoidal wave optical signal, further according to two
Sinusoidal wave optical signal is to dual detector direct current Zeeman atomic absorption optical adjustment so that the light letter of two sine waves
Whether number the lowest point is zero, be zero to realize adjusting dual detector Zeeman atomic absorption optics by observing this valley
School.
2. a kind of polarization for dual detector direct current Zeeman atomic absorption according to claim 1 is adjusted
Calibration method, it is characterised in that said two optical signal phase difference 180 degree.
3. inclined for dual detector direct current Zeeman atomic absorption of a kind of according to claim 1 or 2
Shake adjusting process, it is characterised in that described devating prism drives the plane of polarization of the polarised light entering exit slit
During rotation, when plane of polarization is perpendicular to magnetic direction, the polarised light entering exit slit fully enters the first light
Electricity multiplier tube, and the optical signal that the second photomultiplier detects is zero；When plane of polarization is parallel to magnetic direction
When, the polarised light entering exit slit should fully enter the second photomultiplier, and the first photomultiplier
The optical signal detecting is zero.
4. the polarization calibration apparatus for dual detector direct current Zeeman atomic absorption, it is characterised in that
Described device includes:
Hollow motor；
Devating prism, described devating prism is coaxially disposed in the sleeve rotor of hollow motor, devating prism around
Central axis, the exit direction at devating prism just can obtain a direction of propagation and incident beam phase
With the polarised light that plane of polarization rotates again together with hollow motor；
Light source, described light source is by the double detection of the central axial alignment of the devating prism in placed coaxial hollow motor
The exit slit of device Zeeman atomic absorption, and overlap with Atomic absorption optical axis.
5. a kind of polarization for dual detector direct current Zeeman atomic absorption according to claim 4 is adjusted
Calibration device, it is characterised in that described devating prism is Romania and Hungary's prisms.
6. a kind of polarization for dual detector direct current Zeeman atomic absorption according to claim 4 is adjusted
Calibration device, it is characterised in that described light source is laser instrument.
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| CN104655272B (en) * | 2015-02-10 | 2018-07-24 | 北京海光仪器有限公司 | Zeeman background correction light path and its system |
| CN105115923B (en) * | 2015-09-22 | 2024-04-09 | 上海光谱仪器有限公司 | Detachable alternating current Zeeman graphite furnace atomizer |
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Non-Patent Citations (2)
| Title |
|---|
| 两款原子吸收光谱仪的塞曼背景校正装置;杨啸涛 等;《分析化学 仪器装置与实验技术》;20111030;第39卷(第10期);全文 * |
| 恒定横向磁场塞曼原子吸收吸光度的计算方法;杨啸涛，何华混;《分析测试学报》;19950125;第14卷(第1期);全文 * |
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