CN203249970U - Non-contact electrostatic spraying charge-to-mass ratio measuring device - Google Patents
Non-contact electrostatic spraying charge-to-mass ratio measuring device Download PDFInfo
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- CN203249970U CN203249970U CN 201320096502 CN201320096502U CN203249970U CN 203249970 U CN203249970 U CN 203249970U CN 201320096502 CN201320096502 CN 201320096502 CN 201320096502 U CN201320096502 U CN 201320096502U CN 203249970 U CN203249970 U CN 203249970U
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- magneto
- optic element
- laser
- catoptron
- sheet laser
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Abstract
The utility model discloses a non-contact electrostatic spraying charge-to-mass ratio measuring device which is especially suitable for calculating the charge-to-mass ratio of charged droplets at induction charging or corona charging. The non-contact electrostatic spraying charge-to-mass ratio measuring device comprises a laser emitter (1),an electrostatic nozzle (4), a polarizer (2), a reflector (3), a reflector (3'), a magneto-optic element (6), an analyzer (7), a composite polarizing prism (8), a photoelectric converter (9), a difference amplifier (10), a conducting wire (11) and an oscilloscope (12), wherein the light emitted by the laser emitter is a sheet light source, and the diameter D of the magneto-optic element, the distance H between the electrostatic nozzle (4) and the magneto-optic element (6), and the spraying angle theta of the electrostatic nozzle (4) satisfy the relationship: D=2*H* tangent (theta/2). By the device, the current values of all fogdrops on the cross section of a charged droplets group can be calculated without needing to contact according to a faraday magneto-optical effect and an ampere circuital theorem, and the charge-to-mass ratio can be calculated by using the mass flow of the droplets group to divide the current values.
Description
Technical field
The utility model relates to the measurement mechanism of electrostatic spray specific charge, especially relates to electrostatic spray specific charge measurement mechanism, belongs to the equipment for plant protection technical field.
Background technology
The researchist adopts simulated target method, Faraday cylinder method and three kinds of measuring methods of netted goal method substantially to the measurement of specific charge both at home and abroad at present.Law in 1984 and Lane adopt smooth sphere and sharp shaped material simulation plant, utilize concentric cable to measure electric charge; Jiangsu University utilized netted goal method and Pi Anbiao to record the carrying capacity of charged droplets in 2008; Dante in 1991 and Gupta etc. utilize Faraday cylinder method and Pi Anbiao to measure the carrying capacity of charged droplets; Application number is 201110156068.5, and the patent that name is called " a kind of stream grains of sand specific charge real-time measurement system " discloses a kind of device that utilizes the real-time high frequency measurement grains of sand of Faraday cylinder method specific charge; Application number is 201010571210.8, name is called " device of the local specific charge of test atomized space in electrostatic spraying ", it mainly discloses a kind of device that utilizes the Faraday cylinder method to test local specific charge, and above these methods all are charged droplets is directly contacted with measurement mechanism and to utilize Pi Anbiao to record its magnitude of current.When the simulated target method was measured specific charge, a large amount of charged droplets can only record the magnitude of current of a fraction of charged droplets along with action of gravitation flows down along the simulation plant; When netted goal method is measured specific charge, only have the droplet of being tackled by wire mesh grid to be collected, therefore collection mist amount is little; When the Faraday cylinder method was measured specific charge, charged droplets and Faraday cylinder collision rebounded.Adopt above three kinds of methods to measure specific charge, so that measurement result is inaccurate.The specific charge that adopts contactless method to measure charged droplets has advantages of that measurement is accurate, easy, but has no correlation report about the specific charge of the method measurement charged droplets.
Summary of the invention
In order to improve the accuracy rate of charged droplets specific charge, the specific charge of charged droplets when particularly responding to charged or corona charging, the present invention studies the carrying capacity that adopts contactless method to record all droplets on the charged droplets group cross-section, obtain simultaneously the momentary current value, according to the ratio calculation specific charge of current value and carrying capacity, the method has improved the accuracy of measuring.Designed simultaneously the device of realizing the method.
Principle of work of the present invention is as follows: utilize Faraday magnetooptical effect to obtain the relation of anglec of rotation β and magnetic induction density B and the voltage V of polarized light polarization face, utilize Ampère circuital theorem to obtain relation between strength of current I and the magnetic induction density B, behind the multiple of strength of current I divided by the differential amplifier amplification that obtains, finally obtain the strength of current I ' of charged droplets.The flow of shower nozzle is approximately the mass rate Q of droplet in the spray process, then according to charged droplets group's average specific charge C/M(mC/kg) computing formula: C/M=(I '/Q) * 10
-6, I ' is the electric current of droplet group in the spray process (A) in the formula, Q(g/s) is the mass rate of droplet in the spray process.
In the method, charged droplets does not need directly to contact with measurement mechanism, utilizes the relation between electricity, the magnetic can obtain strength of current, has improved and has adopted the contact method to obtain the accuracy of strength of current.Be specially adapted to measure the carrying capacity of charged droplets when responding to charged or corona charging.
This contactless electrostatic spray specific charge measurement mechanism comprises generating laser 1, static nozzle 4, photoelectric detection system.Photoelectric detection system comprises the polarizer 2, the first catoptron 3, the second catoptron 3', magneto-optic element 6, analyzer 7, compound ahrens prism 8, photoelectric commutator 9, differential amplifier 10, wire 11 and oscillograph 12, and the sheet laser that the polarizer 2 centers and generating laser 1 send is on same straight line; The circular flat of magneto-optic element 6 is vertical with the axis of static nozzle 4, and the center of the center of magneto-optic element 6 and static nozzle 4 is on same straight line, magneto-optic element 6 is vertical with the line of the polarizer 2 with generating laser 1 simultaneously, and vertical with the line of compound ahrens prism 8 with analyzer 7; Be symmetric about magneto-optic element 6 at the first catoptron 3 on+45 ° of directions and the second catoptron 3' on-45 ° of directions, the sheet laser that guarantees generating laser 1 emission becomes 90 ° with the sheet laser of the first catoptron 3 reflections, guarantees that simultaneously the sheet laser of generating laser 1 emission is parallel with the sheet laser of the second catoptron 3' reflection; Analyzer 7 places between the second catoptron 3' and the compound ahrens prism 8, and the three is located along the same line, and parallel with the polarizer 2 with generating laser 1; Compound ahrens prism 8 resolves into orthogonal light intensity P1 and P2 with reflection source; Described photoelectric commutator 9 receives light intensity P1 and the P2 of compound ahrens prism 8 refractions, then light intensity is converted to voltage V1 and V2 output; Differential amplifier 10 adopts the form of dual input dual output, and input end is connected with photoelectric commutator 9, and output terminal is connected with oscillograph 12; Oscillograph 12 1 ends link to each other with an output pin of differential amplifier 10, and other end ground connection can be in the hope of the output pin voltage of differential amplifier 10.
The light that described generating laser 1 sends is sheet laser, and sheet laser is on the yoz face.
The sheet laser of generating laser 1 emission is vertical with the sheet laser through magneto-optic element 6, sheet laser thickness on the y direction is less than the thickness of magneto-optic element 6, and the sectional area of magneto-optic element 6 is less than or equal to the sectional area by the sheet laser at magneto-optic element 6 places on the xoz plane.
The diameter D of described magneto-optic element is 15 ~ 220cm.
Static nozzle 4 is 20 ~ 60cm with the distance H of magneto-optic element 6.
This device uses the particular content of this principle of work to be: under the effect of HV generator and electrode, produce magnetic field B around the static nozzle 4, the laser light sheet of first catoptron 3 reflections of warp on+45 ° of directions passes through from an end of magneto-optic element 6, because the effect in magnetic field, through the laser of the reflection of the second catoptron 3' on-45 ° of directions, its light polarization direction can rotate again.If the anglec of rotation (the direction angle that thoroughly shakes of the polarizer 2 and analyzer 7) is β.According to Faraday magnetooptical effect, magnetic field B will cause the rotation of polarized light plane of polarization, and the anglec of rotation is
β=νBD （1）
, wherein ν is Verdet constant (rad/AT), and is relevant with medium and frequency of light wave that light passes through, and B is the magnetic induction density (T) around the static nozzle, and D is the diameter (m) of magneto-optic element.
According to Ampère circuital theorem, the vertical range of establishing static nozzle 4 and magneto-optic element 6 is H, satisfies following relationship between magnetic induction density B and the strength of current I:
B=(μ
0I)/(2πH) （2）
, μ in the formula
0=4 π * 10
-7H/m, I are strength of current (A), and B is the magnetic induction density (T) around the static nozzle, and H is the distance (m) of static nozzle and magneto-optic element.In order to make magneto-optic element 6 in uniform magnetic field B, should satisfy D=2H * tan (θ/2) as far as possible, and D=15 ~ 210cm, H=20 ~ 60cm.
Can be got by (1) and (2):
I=(2πHβ)/( νDμ
0) （3）
For measuring β, adopt the constructional device of Fig. 1.In photoelectric detection system, compound ahrens prism 8 resolves into orthogonal light P of two bundles with sheet laser
1And P
2, then incide on two identical photoelectric commutators 9 of performance, utilize differential amplifier 10 to the voltage V of their output
1And V
2Amplify.When the gain of photoelectric commutator 9 and differential amplifier 10 all is in the linear work district, V
1With P
1And P
2Light intensity difference be directly proportional i.e.: V
1=k
1(P
1-P
2), V
1With P
1And P
2Light intensity and be directly proportional i.e.: V
2=k
2(P
1+ P
2), k here
1And k
2The proportionality constant that represents respectively voltage and light intensity can obtain by actual measurement.
If light polarization direction is rotated in the counterclockwise direction, sheet laser is ± 45 ° of Directional Decompositions, then two photoelectric commutators 9 are output as:
V
1= k
1（P
1－P
2）= k
1[E
2sin
2(45+β)－E
2cos
2(45+β)]=2k
1I
0β （4）
V
2= k
2（P
1＋P
2）= k
2[E
2sin
2(45+β)＋E
2cos
2(45+β)]=k
2I
0 （5）
Wherein, I
0The light intensity on the compound ahrens prism is incided in expression.
Obtained by (4) and (5):
β=(k
2V
1)/(2k
1V
2) （6）
Following formula substitution (3) formula can be tried to achieve strength of current I=(the π Hk of charged droplets group on the sheet laser cross section
2V
1)/(ν D μ
0k
1V
2)
, wherein, I is strength of current (A), H is the vertical range (m) of static nozzle and magneto-optic element, V
1And V
2Be the output voltage (V) of differential amplifier, ν is the Field constant, and D is the diameter (m) of magneto-optic element, k
1And k
2Be respectively the proportionality constant of voltage and light intensity, μ in the formula
0=4 π * 10
-7H/m.
The flow of shower nozzle is approximately the mass rate Q of droplet in the spray process, the utilization socket joint is received the droplet of shower nozzle ejection, then utilizes the quality of liquid in the electronic balance weighing graduated cylinder
m(g), the time of simultaneously record spraying
t(s).Measure three times, get quality
m(g) and the time
t(s) mean value
m' and
t', utilize formula Q=
m'/
t' try to achieve the mass rate Q(g/s of droplet).
Use this device to realize that the measuring method of contactless electrostatic spray specific charge is:
The first step: sprayed in static nozzle centrally aligned magneto-optic element center, and the data V of recording oscillometer demonstration
1And V
2, when the gain of photoelectric commutator 9 and differential amplifier 10 all is in the linear work district, V
1With P
1And P
2Light intensity difference be directly proportional i.e.: V
1=k
1(P
1-P
2), V
2With P
1And P
2Light intensity and be directly proportional i.e.: V
2=k
2(P
1+ P
2), k here
1And k
2The proportionality constant that represents respectively voltage and light intensity;
Light polarization direction is rotated in the counterclockwise direction, and sheet laser is ± 45 ° of Directional Decompositions, and then two photoelectric commutators 9 are output as:
V
1= k
1（P
1－P
2）= k
1[E
2sin
2(45+β)－E
2cos
2(45+β)]=2k
1I
0β （1）
V
2= k
2（P
1＋P
2）= k
2[E
2sin
2(45+β)＋E
2cos
2(45+β)]=k
2I
0 （2）
Wherein, I
0The light intensity on the compound ahrens prism is incided in expression.
Obtained by (1) and (2): β=(k
2V
1)/(2k
1V
2) (3)
Second step: HV generator and electrode produce magnetic field B around static nozzle 4, and under the effect in magnetic field, through the laser of the second catoptron 3' reflection, the rotation of β angle can occur its light polarization direction again; The β angle is the direction angle that thoroughly shakes of the polarizer 2 and analyzer 7; According to Faraday magnetooptical effect,
β=νBD （4）
Wherein ν is Verdet constant (rad/AT), and is relevant with medium and frequency of light wave that light passes through, and B is the magnetic induction density (T) around the static nozzle, and D is the diameter (m) of magneto-optic element.
According to Ampère circuital theorem, satisfy following relationship between magnetic induction density B and the strength of current I:
B=(μ
0I)/(2πH) （5）
μ in the formula
0=4 π * 10
-7H/m, I are strength of current (A), and B is the magnetic induction density (T) around the static nozzle, and H is the distance (m) of static nozzle and magneto-optic element.In order to make magneto-optic element 6 in uniform magnetic field B, should satisfy D=2H * tan (θ/2) as far as possible, and D=15 ~ 210cm, H=20 ~ 60cm.
Can be got by (4) and (5): I=(2 π H β)/(ν D μ
0) (6)
The 3rd step: bring formula (3) into formula (6), obtain I=(π Hk
2V
1)/(ν D μ
0k
1V
2), I is the strength of current of charged droplets group on the sheet laser cross section;
The 4th step: the strength of current I ' that this strength of current I is obtained charged droplets divided by the multiple of differential amplifier amplification;
The 5th step: the flow of shower nozzle is approximately the mass rate Q of droplet in the spray process, the utilization socket joint is received the droplet of shower nozzle ejection, then utilizes the quality of liquid in the electronic balance weighing graduated cylinder
m(g), the time of simultaneously record spraying
t(s).Measure repeatedly, get quality
m(g) and the time
t(s) mean value
m' and
t', utilize formula Q=
m'/
t' try to achieve the mass rate Q(g/s of droplet);
The 6th step: with I ' and Q substitution formula C/M=(I '/Q) * 10
-6, try to achieve charged droplets group mean specific charge C/M(mC/kg).
Description of drawings
Fig. 1 is the structural representation of the measurement mechanism of contactless electrostatic spray specific charge.
Fig. 2 is the polarization vector figure of the polarizer and analyzer.
Fig. 3 is the measuring method framework process flow diagram of contactless electrostatic spray specific charge.
Among the figure, 1-generating laser, the 2-polarizer, 3-the first catoptron, 3'-the second catoptron, 4-static nozzle, 5-charged droplets group, 6-magneto-optic element, 7-analyzer, the compound ahrens prism of 8-, 9-photoelectric commutator, 10-differential amplifier, 11-wire, 12-oscillograph.
The diameter of the distance of H-static nozzle and magneto-optic element, D-magneto-optic element, E
0The spreading of spray of the direction of thoroughly the shaking of-polarizer, the direction of thoroughly shaking of E-analyzer, β-anglec of rotation (the direction angle that thoroughly shakes of the polarizer and analyzer), θ-shower nozzle.
Embodiment
Technical scheme for a better understanding of the present invention, the present invention is further illustrated below in conjunction with accompanying drawing.
Apparatus structure schematic diagram of the present invention as shown in Figure 1, this device comprises generating laser 1, static nozzle 4, photoelectric detection system.Photoelectric detection system comprises the polarizer 2, the first catoptron 3, the second catoptron 3', magneto-optic element 6, analyzer 7, compound ahrens prism 8, photoelectric commutator 9, differential amplifier 10, wire 11 and oscillograph 12.
In conjunction with Fig. 1, implement when of the present invention, arrange the components and parts of this device according to Fig. 1.The light that generating laser 1 sends is sheet laser, and sheet light is on the yoz plane; Described photoelectric detection system comprises the polarizer 2, the first catoptron 3, the second catoptron 3', magneto-optic element 6, analyzer 7, compound ahrens prism 8, photoelectric commutator 9, differential amplifier 10, wire 11 and oscillograph 12; The sheet laser of the described polarizer 2 centers and generating laser 1 emission is on same straight line; Described magneto-optic element 6 is vertical with the axis of static nozzle 4, and the center of the center of magneto-optic element 6 and static nozzle 4 is on same straight line, magneto-optic element 6 can use the materials such as dense flint glass, rare earth iron garnet, rare earth-transition metal (RE-TM) alloy firm, the sheet laser of generating laser 1 emission is vertical with the sheet laser through magneto-optic element 6, sheet laser thickness on the y direction is less than the thickness of magneto-optic element 6, and sheet laser all wraps magneto-optic element 6 on the xoz plane; Described on+45 ° of directions the first catoptron 3 and the second catoptron 3' on-45 ° of directions be symmetric about magneto-optic element 6, the sheet laser that guarantees generating laser 1 emission becomes 90 ° with the sheet laser of the first catoptron 3 reflections, guarantees that simultaneously the sheet laser of generating laser 1 emission is parallel with the sheet laser of the second catoptron 3' reflection; Described compound ahrens prism 8 resolves into orthogonal light intensity P with reflection source
1And P
2Described photoelectric commutator 9 receives the light intensity P of compound ahrens prism 8 refractions
1And P
2, then light intensity is converted to voltage V
1And V
2Output; Described analyzer 7 places between the second catoptron 3' and the compound ahrens prism 8; One of described analyzer 7, compound ahrens prism 8 and photoelectric commutator 9 are on same straight line, and be and parallel with the polarizer 2 with generating laser 1; Described differential amplifier 10 adopts the form of dual input dual output, and input end is connected with photoelectric commutator 9, and output terminal is connected with oscillograph 12; Described oscillograph 12 1 ends link to each other with an output pin of differential amplifier 10, and other end ground connection can be in the hope of the voltage of 10 1 pin of differential amplifier.
Key of the present invention is: the light that generating laser 1 sends is sheet laser; Static nozzle 4 satisfies relation with magneto-optic element 6: D=2H * tan (θ/2), and D=15 ~ 210cm, H=20 ~ 60cm; Sheet laser through magneto-optic element 6 is vertical with the axis of static nozzle 4, and the thickness of sheet laser is less than the thickness of magneto-optic element 6, and sheet laser all comprises magneto-optic element 6; Be symmetric about the axis of static nozzle 4 at the first catoptron 3 on+45 ° of directions and the second catoptron 3' on-45 ° of directions; Try to achieve the output voltage values V of differential amplifier
1And V
2, and in conjunction with formula I=(π Hk
2V
1)/(ν D μ
0k
1V
2) obtain strength of current I, then with behind its multiple divided by the differential amplifier amplification, finally obtain the strength of current I ' of charged droplets.Wherein I is strength of current (A), and H is the vertical range (m) of static nozzle and magneto-optic element, V
1And V
2Be the output voltage (V) of differential amplifier, ν is the Field constant, and D is the diameter (m) of magneto-optic element, k
1And k
2Be respectively the proportionality constant of voltage and light intensity, μ in the formula
0=4 π * 10
-7H/m.
Claims (4)
1. the measurement mechanism of a contactless electrostatic spray specific charge, comprise generating laser (1), static nozzle (4) and photoelectric detection system, it is characterized in that: photoelectric detection system comprises the polarizer (2), the first catoptron (3), the second catoptron (3'), magneto-optic element (6), analyzer (7), compound ahrens prism (8), photoelectric commutator (9), differential amplifier (10), wire (11) and oscillograph (12), and the sheet laser that the polarizer (2) center and generating laser (1) send is on same straight line; The circular flat of magneto-optic element (6) is vertical with the axis of static nozzle (4), and the center of the center of magneto-optic element (6) and static nozzle (4) is on same straight line, magneto-optic element (6) is vertical with the line of the polarizer (2) with generating laser (1) simultaneously, and vertical with the line of compound ahrens prism (8) with analyzer (7); Be symmetric about magneto-optic element (6) at the first catoptron (3) on+45 ° of directions and the second catoptron (3') on-45 ° of directions, the sheet laser that guarantees generating laser (1) emission becomes 90 ° with the sheet laser of the first catoptron (3) reflection, guarantees that simultaneously the sheet laser of generating laser (1) emission is parallel with the sheet laser of the second catoptron (3') reflection; Analyzer (7) places between the second catoptron (3') and the compound ahrens prism (8), and the three is located along the same line, and parallel with the polarizer (2) with generating laser (1); Differential amplifier (10) adopts the form of dual input dual output, and input end is connected with photoelectric commutator (9), and output terminal is connected with oscillograph (12); Oscillograph (12) one ends link to each other other end ground connection with an output pin of differential amplifier (10).
2. measurement mechanism as claimed in claim 1, it is characterized in that: the light that described generating laser (1) sends is sheet laser, and sheet laser is on the yoz face.
3. measurement mechanism as claimed in claim 1, it is characterized in that: the sheet laser of generating laser (1) emission is with vertical through the sheet laser of magneto-optic element (6), sheet laser thickness on the y direction is less than the thickness of magneto-optic element (6), and the sectional area of magneto-optic element on the xoz plane (6) is less than or equal to the sectional area of the sheet laser of locating by magneto-optic element (6).
4. measurement mechanism as claimed in claim 1, it is characterized in that: the diameter D of described magneto-optic element, static nozzle (4) satisfy D=2H * tan (θ/2) relation with the distance H of magneto-optic element (6), the spreading of spray θ three of static nozzle, and D is 15 ~ 210cm, and H is 20 ~ 60cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320096502 CN203249970U (en) | 2013-03-01 | 2013-03-01 | Non-contact electrostatic spraying charge-to-mass ratio measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320096502 CN203249970U (en) | 2013-03-01 | 2013-03-01 | Non-contact electrostatic spraying charge-to-mass ratio measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN203249970U true CN203249970U (en) | 2013-10-23 |
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ID=49376403
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|---|---|---|---|
| CN 201320096502 Withdrawn - After Issue CN203249970U (en) | 2013-03-01 | 2013-03-01 | Non-contact electrostatic spraying charge-to-mass ratio measuring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163388A (en) * | 2013-03-01 | 2013-06-19 | 江苏大学 | Measuring method and measuring device of non-contact electrostatic spraying charge-to-mass ratios |
| CN106841834A (en) * | 2015-12-07 | 2017-06-13 | 中国电力科学研究院 | The measuring method of carried charge in a kind of motion process to metal particle |
| CN108459213A (en) * | 2018-04-11 | 2018-08-28 | 黑龙江八农垦大学 | Aviation plant protection electrostatic spray droplet charge-mass ratio Detecting data |
-
2013
- 2013-03-01 CN CN 201320096502 patent/CN203249970U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163388A (en) * | 2013-03-01 | 2013-06-19 | 江苏大学 | Measuring method and measuring device of non-contact electrostatic spraying charge-to-mass ratios |
| CN106841834A (en) * | 2015-12-07 | 2017-06-13 | 中国电力科学研究院 | The measuring method of carried charge in a kind of motion process to metal particle |
| CN106841834B (en) * | 2015-12-07 | 2019-12-13 | 中国电力科学研究院 | Method for measuring charged quantity in metal particle movement process |
| CN108459213A (en) * | 2018-04-11 | 2018-08-28 | 黑龙江八农垦大学 | Aviation plant protection electrostatic spray droplet charge-mass ratio Detecting data |
| CN108459213B (en) * | 2018-04-11 | 2024-01-30 | 黑龙江八一农垦大学 | Aviation plant protection electrostatic spray fog drop charge-to-mass ratio detection test bed |
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