CN109342326A - A kind of phase-sensitive detection circuit of automatic polarimeter - Google Patents
A kind of phase-sensitive detection circuit of automatic polarimeter Download PDFInfo
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- CN109342326A CN109342326A CN201811357376.2A CN201811357376A CN109342326A CN 109342326 A CN109342326 A CN 109342326A CN 201811357376 A CN201811357376 A CN 201811357376A CN 109342326 A CN109342326 A CN 109342326A
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- 238000011896 sensitive detection Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000010363 phase shift Effects 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 101100190527 Arabidopsis thaliana PIN5 gene Proteins 0.000 description 1
- 101150087393 PIN3 gene Proteins 0.000 description 1
- 101150011456 PIN8 gene Proteins 0.000 description 1
- 108010037490 Peptidyl-Prolyl Cis-Trans Isomerase NIMA-Interacting 4 Proteins 0.000 description 1
- 102100031653 Peptidyl-prolyl cis-trans isomerase NIMA-interacting 4 Human genes 0.000 description 1
- 102000007315 Telomeric Repeat Binding Protein 1 Human genes 0.000 description 1
- 108010033711 Telomeric Repeat Binding Protein 1 Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- 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
- G01N21/21—Polarisation-affecting properties
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- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A kind of phase-sensitive detection circuit of automatic polarimeter of the present invention, is related to phase-sensitive detection circuit technical field.Including the tested modulated signal formed after amplification, filtering, phase shift, coupled capacitor C7 is connect with selective frequency amplifier circuit, selective frequency amplifier circuit includes the twin-T network that 50Hz signal amplifies, coupled capacitor C4 is connect with twice operational amplifier U2A is put, then coupled capacitor C5 is connect with differential amplifier circuit；Make reference signal with 50% duty ratio square wave of modulated signal identical frequency to connect via diode D1 with the detecting circuit that alternative analog switch forms.There is no motors to turn motionless problem compared with traditional structure by the present invention；Secondly as the advantage of high speed measurement, further promotes the minimum light transmission rate index of instrument；Again, can sample minimum light transmission rate index be increased to 0.1%-0.01%；Finally, with traditional higher Glan Thompson prism of price, more than the one third that can reduce complete machine cost.
Description
Technical field
The present invention relates to phase-sensitive detection circuit technical fields, refer specifically to a kind of phase-sensitive detection circuit of automatic polarimeter.
Background technique
At home in the measurements with external automatic polarimeter product, optical path is all made of to pass through sample tube and detect polarization
The angle that light changes determines the detection method of sample optical activity.Color depth increase due to being fitted into sample in test tube will lead to
Optical path signal is significantly decayed, previous high-grade automatic polarimeter product by using Glan Thompson prism as the polarizer with
Analyzer, since the light transmittance of Glan Thompson prism is compared with common polaroid height, the sample that complete machine can achieve 0.1% is minimum
Light rate, to maintain signal strength required for normal detection.But the price of Glan Thompson prism is higher, accounts for complete machine cost
One third more than.Due to use common polaroid substitution Glan Thompson prism then complete machine only have 1% minimum light transmission rate,
Reach identical effect then to need to greatly improve signal-to-noise ratio.
Summary of the invention
It is an object of the invention to overcome missing and deficiency of the existing technology, propose a kind of in the original all rotations of holding
While light instrument performance indicator, the phase-sensitive detection circuit of the automatic polarimeter of signal-to-noise ratio is increased substantially.
The present invention, in order to improve the signal-to-noise ratio of instrument and distinguish the left-handed and dextrorotation of sample, needs in automatic polarimeter
Faraday modulation device is used to be modulated polarised light.The measured signal that modulated signal is formed after amplification, filtering, phase shift.
It is coupled to the selective frequency amplifier circuit being made of operational amplifier U2B by C7, it is specified that 50Hz signal is amplified.By C4 coupling
It closes to be put by operational amplifier U2A and be twice, the differential amplifier circuit being made of operational amplifier U1B is coupled to using C5.
MAX4094 is alternative analog switch, uses signal source identical with modulated signal as reference signal and is input to switch control
It holds (PIN3), normally open end (PIN2) connects the output of U1B, and normal-closed end (PIN4) ground connection, common end (PIN8) connects operation amplifier
The non-inverting input terminal of device U1A, holding and overturning via U1A to frequency selection signal, an available signal-to-noise ratio height at least quantity
The test signal of grade.During analog switch switches between two paths of signals, the positive half cycle of 50Hz sine wave amplified signal
Or negative half period is scabbled, in addition half cycle is maintained, by U1A to the positive half cycle of original 50Hz sine wave amplified signal or negative half
Week is overlapped, and forms the test signal of only positive half cycle or negative half period at this time, completes left-handed to sample and dextrorotation area
Point.Half-cycle signal facilitates integral to be also beneficial to improve signal resolution, thus also it can be seen that signal is attached in polarizing film extinction position
Close angular dimension.
As described above, the phase-sensitive detection circuit that designs of the present invention is applied to using stepper motor and high resolution encoder
Polarimeter product then can be most suitable.
Detailed description of the invention
Fig. 1 is a kind of phase-sensitive detection circuit functional block diagram of automatic polarimeter of the present invention；
Wherein, selective frequency amplifier circuit: 1, it is operational amplifier U2B；
Operational amplifier: 2, it is U2A；
Differential amplifier circuit: 3, it is that operational amplifier U1B and operational amplifier U1A is formed；
Alternative analog switch: 4, it is MAX4094.
Fig. 2 is the key wiring diagram of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the good embodiment of attached drawing, the invention will be further described
A kind of phase-sensitive detection circuit of automatic polarimeter (as shown in attached drawing 1,2), including the shape after amplification, filtering, phase shift
At tested modulated signal, coupled capacitor C7 connect with selective frequency amplifier circuit 1；
Selective frequency amplifier circuit 1 includes the twin-T network amplified to 50Hz signal, coupled capacitor C4 with put it is twice
Operational amplifier U2A2 connection, then coupled capacitor C5 are connect with differential amplifier circuit 3；
Make reference signal with 50% duty ratio square wave of modulated signal identical frequency and inputs alternative mould via diode D1
The detecting circuit connection that quasi- switch 4 forms.
Further, the selective frequency amplifier circuit 1 is made of operational amplifier U2B.
The twin-T network by by the first potentiometer, the second potentiometer, resistance R7, R13, R14, R15 and capacitor C2, C3,
C8, C9 are constituted；First potentiometer and the second potentiometer are in parallel.
The differential amplifier circuit 2 is made of operational amplifier U1B and operational amplifier U1A.
The alternative analog switch 4 is MAX4094.
Wherein, the control terminal of the alternative analog switch 4 and diode D1 input connect；Normally open end and differential amplification electricity
The output end of 3 operational amplifier U1B of road connects；Normal-closed end ground connection；Common end is with 3 operational amplifier U1A's of differential amplifier circuit
Non-inverting input terminal connection.
As described above, the phase-sensitive detection circuit that designs of the present invention is applied to using stepper motor and high resolution encoder
Polarimeter product then can be most suitable.Firstly, previous faint test signal can not direct drive servovalve motor, and stepper motor
It is driven by controller, there is no motors to turn motionless problem；Secondly as the advantage of high speed measurement, facilitates carry out over-sampling, it can
Further to promote the minimum light transmission rate index of instrument；It again, can be by automatic polarimeter when using a pair of of common polaroid
Can sample minimum light transmission rate index be increased to 0.1%-0.01%；Finally, with traditional higher Glan Thompson rib of price
Mirror is compared, and complete machine cost one third or more can be reduced.
Claims (3)
1. a kind of phase-sensitive detection circuit of automatic polarimeter, which is characterized in that including the quilt formed after amplification, filtering, phase shift
Survey modulated signal, coupled capacitor C7 connect with selective frequency amplifier circuit (1), coupled capacitor C4 with put twice operation amplifier
Device U2A (2) connection, then coupled capacitor C5 are connect with differential amplifier circuit (3)；With 50% duty of modulated signal identical frequency
Make reference signal than square wave to connect via diode D1 with the detecting circuit that alternative analog switch (4) forms.
2. a kind of phase-sensitive detection circuit of automatic polarimeter as described in claim 1, which is characterized in that the frequency-selecting amplification electricity
Road (1) includes the twin-T network that operational amplifier U2B composition and 50Hz signal amplify；The twin-T network by Rp1 potentiometer,
Rp2 potentiometer, resistance R7, R13, R14, R15 and capacitor C2, C3, C8, C9 are constituted；The differential amplifier circuit (3) is by operation
Amplifier U1B composition；The alternative analog switch (4) is MAX4094.
3. a kind of phase-sensitive detection circuit of automatic polarimeter as claimed in claim 1 or 2, which is characterized in that the alternative
Control terminal and diode the D1 input of analog switch (4) connect, and normally open end is with differential amplifier circuit (3) operational amplifier U1B's
Output end connection, normal-closed end ground connection, common end is connect with the non-inverting input terminal of differential amplifier circuit (3) operational amplifier U1A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811357376.2A CN109342326A (en) | 2018-11-15 | 2018-11-15 | A kind of phase-sensitive detection circuit of automatic polarimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811357376.2A CN109342326A (en) | 2018-11-15 | 2018-11-15 | A kind of phase-sensitive detection circuit of automatic polarimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109342326A true CN109342326A (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811357376.2A Pending CN109342326A (en) | 2018-11-15 | 2018-11-15 | A kind of phase-sensitive detection circuit of automatic polarimeter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201503475U (en) * | 2009-09-11 | 2010-06-09 | 江苏科技大学 | Thyristor arm-lacking fault detection circuit based on frequency resonance |
| CN201699659U (en) * | 2010-07-02 | 2011-01-05 | 中国科学技术大学 | Phase-locked amplifier |
| CN102607604A (en) * | 2012-03-15 | 2012-07-25 | 李建国 | Phase-sensitive detection circuit |
| CN104660170A (en) * | 2014-06-19 | 2015-05-27 | 吴春刚 | Phase sensitive detection circuit |
| CN107124179A (en) * | 2017-05-08 | 2017-09-01 | 安康学院 | A kind of lock-in amplifier for detecting faint photo-signal |
| CN207867010U (en) * | 2018-02-05 | 2018-09-14 | 南京云磁电子科技有限公司 | Queen post is used for the device of ferromagnetic detection |
| CN209086131U (en) * | 2018-11-15 | 2019-07-09 | 上海仪电物理光学仪器有限公司 | A kind of phase-sensitive detection circuit of automatic polarimeter |
-
2018
- 2018-11-15 CN CN201811357376.2A patent/CN109342326A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201503475U (en) * | 2009-09-11 | 2010-06-09 | 江苏科技大学 | Thyristor arm-lacking fault detection circuit based on frequency resonance |
| CN201699659U (en) * | 2010-07-02 | 2011-01-05 | 中国科学技术大学 | Phase-locked amplifier |
| CN102607604A (en) * | 2012-03-15 | 2012-07-25 | 李建国 | Phase-sensitive detection circuit |
| CN104660170A (en) * | 2014-06-19 | 2015-05-27 | 吴春刚 | Phase sensitive detection circuit |
| CN107124179A (en) * | 2017-05-08 | 2017-09-01 | 安康学院 | A kind of lock-in amplifier for detecting faint photo-signal |
| CN207867010U (en) * | 2018-02-05 | 2018-09-14 | 南京云磁电子科技有限公司 | Queen post is used for the device of ferromagnetic detection |
| CN209086131U (en) * | 2018-11-15 | 2019-07-09 | 上海仪电物理光学仪器有限公司 | A kind of phase-sensitive detection circuit of automatic polarimeter |
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Address after: 201613 floor 1-3, building 7, No. 88, Xutang Road, Songjiang District, Shanghai Applicant after: SHANGHAI INSTRUMENT PHYSICAL OPTICS INSTRUMENT Co.,Ltd. Address before: 200232 02 Guiping Road West, 18 Guiping Road, Xuhui District, Shanghai. Applicant before: SHANGHAI INSTRUMENT PHYSICAL OPTICS INSTRUMENT Co.,Ltd. |
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