CN110207859A - A kind of electromagnetic balance formula force snesor and electronic balance based on optical lever - Google Patents
A kind of electromagnetic balance formula force snesor and electronic balance based on optical lever Download PDFInfo
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- CN110207859A CN110207859A CN201910406330.3A CN201910406330A CN110207859A CN 110207859 A CN110207859 A CN 110207859A CN 201910406330 A CN201910406330 A CN 201910406330A CN 110207859 A CN110207859 A CN 110207859A
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- optical lever
- balance
- electromagnetic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
- G01G7/02—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups by electromagnetic action
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/08—Measuring force or stress, in general by the use of counterbalancing forces
- G01L1/086—Measuring force or stress, in general by the use of counterbalancing forces using electrostatic or electromagnetic counterbalancing forces
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- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
The present invention provides a kind of electromagnetic balance formula force snesor and electronic balance based on optical lever, including optical lever, PSD element, electromagnetic coil and closed loop detection system；The optical lever reflects the light on PSD element for generating light beam；The PSD element is used to detect the displacement of optical lever reflection light point；The PSD element is connect with closed loop detection system, and the closed loop detection system is connect with electromagnetic coil.The electro-optical system that the displacement detection system that the present invention dexterously uses optical lever and PSD element to form replaces existing electronic analytical balance for displacement detecting, by the way that feed rod pole technology and PSD element are blended with electro magnetic force sensor, the detection sensitivity of existing electronic analytical balance is further promoted.
Description
Technical field
The invention belongs to sensor fields, and in particular to a kind of electromagnetic balance formula force snesor and electronics based on optical lever
Balance.
Background technique
Electronic balance collection sensing technology, analog electronics technique, Digital Electronic Technique, computer technology, Intelligent Information Processing
Technology, material and Precision Manufacturing Technology and many technologies development condensation products, have compared to mechanical balance
Weigh multiple functions and the superiority such as quick, easy to operate, automatic calibration, fault self-diagnosis.Electronic balance is just fast once appearance
Speed enter metering, weighing field, become scientific research, production, military project, medicine and other fields indispensability detecting instrument.
Electronic balance can be divided into ultramicron electronic balance (2~5g of maximum capacity, resolving power < 1 μ g), micro electricity by its precision
Sub- balance (3~50g of maximum capacity, 1 μ g of resolving power), semimicro electronic balance (20~100g of maximum capacity, 10 μ g of resolving power)
And constant electronic balance (maximum capacity 100~200g, resolving power 0.1mg) four classes.Usually said electronic analytical balance is that is, super
The general name of microbalance, microbalance, semimicro-analy-tical balance and constant balance.
Electronic analytical balance generally comprises a closed-loop regulating system electromagnetic force balance sensor, has accuracy high, stablizes
The good advantage of property.Traditional electronic analytical balance structural principle is as shown in Figure 1, include loading device, electromagnetism force loading device, light
Dielectric displacement detection device and photocell signal processing circuit；The loading device includes determinand 1, objective table 2, vertical support rod
3, horizontal support bar 4 and horizontal support bar spring 5；The electromagnetism force loading device includes horizontal gird 6, diaphragm 7, strut 8, branch
Bar spring 9, coil brace 10, electromagnetic coil 11, permanent magnetism 12, magnetic yoke 13 and stand connection 14；As shown in Fig. 2, the photoelectricity
Displacement detector 7 includes photo-electroluminescence pipe 15, the diaphragm 16 with rectangular notch, photoelectric converter 17, photoelectric converter 18, light
Door screen be in beam central when hot spot 19 and stop shift after hot spot 20.In Fig. 1, the scale pan, that is, objective table 2 is placed in vertical support rod 3
On, it is connected by the rack rod containing reed with an electromagnetic coil being placed among magnet steel 11, and energization magnetic coil 11 is in
In the magnetic field that permanent magnet generates.Energization magnetic coil 11 is generated ampere vertically downward by the magnetic fields for being parallel to coil plane
Power.As shown in Fig. 2, photoelectric displacement detection device 7 includes photo-electroluminescence pipe 15, diaphragm 16, photoelectric converter with rectangular notch
17, the hot spot 20 when photoelectric converter 18, diaphragm are in beam central after hot spot 19 and stop shift；It is set in the right end of a connecting rod
One diaphragm 16 with rectangular notch, in the one photo-electroluminescence pipe 15 of installation on one side of the diaphragm 16 of rectangular notch, another side placement property
Consistent a pair of of the photoelectric converter 17,18 of energy, after loading determinand 1 on pan of a steelyard, the position of lever changes, and photoelectricity turns
The location variation that parallel operation will test is converted to the output of corresponding electric signal, then passes through PID circuit and driving circuit, will be with
The corresponding electric current load of position signal generates an electromagnetic force on the coil 11 that permanent-magnet material generates magnetic field.By certainly
It is dynamic to adjust, finally make electromagnetic force torque and the gravity torque of determinand 1 reach balance again, balance reaches stable, at this point, stream
The size of current for crossing coil 11 is directly proportional to load gravity, and the weight of object can be measured or by demarcating by obtaining current value
To the quality of determinand 1.
The development that Switzerland, Germany, the U.S., Japan etc. carry out electronic balance earliest just has in phase early 1980s
Produce the ability of electronic analytical balance in enormous quantities.Such as the Sartorius of Germany, the METTLER TOLEDO of Switzerland and the U.S.
Explorer is the three-horse hitch vehicle of current electronic balance in the world production and manufacturing field, is in lab scale and industrial balance
Leading position.
With new material continue to bring out and the development of advanced manufacturing technology, the structure of electromagnetic force balance sensor are also at
In continuous improvement and development, from initial electromagnetic force direct drive, single-stage lever is developed to, then arrive multi-grade lever formula.
External advanced electronic analytical balance enterprise has captured sensing unit invar property reed, the formula of advanced permanent magnet material and heat treatment
Process difficulties take high-precision wire cutting processing technology, use simultaneous manufacturing technology to monolithic aluminum alloy materials, are made
The electromagnetic force balance sensor of integral structure, i.e. single module (Mono-block) electromagnetic force balance sensor.Switzerland METTLER
TOLEDO takes the lead in single module sensor application on electronic analytical balance, making its weighing accuracy reach micro or even ultramicron, such as
XP2U type ultramicron electronic balance, maximum capacity value are 2.1g, and resolving power is up to 0.1 μ g.
Except in addition to research and development in terms of electro magnetic force sensor, developed country electronic analytical balance circuit design,
Information processing, the inhibition of drift value, non-liner revision etc. are technically also made that many researchs to maintain the leading position.
China starts from late 1970s to the development of electronic balance, initial product due to production technology not enough at
It is ripe, large-scale production can not be formed.To mid-term the 1980s, by introduce and digest and assimilate Sartorius AG and
The advanced technology of Japanese Shimadzu Corporation enables the electronic balance technology fast development in China.At home, Hunan University and the western Hunan
The smart electronics analysis day that range is 0~200g, precision is 0.1mg was successfully developed in instrument and meter head factory cooperation in 1986
It is flat, reach the international most advanced level of early 1980s.To phase early 1990s, Shanghai balance equipment factory, Changshu
The Duo Jia electronic balance manufacturer process many years research public relations of weighing apparatus factory, Xiang Yi balance factory, Shenyang Long Teng projection electronic weighing instrument company,
The ability for having had batch production electronic balance.In recent years, domestic to focus on solving signal processing, temperature in electronic balance research
Drift compensation, magnet steel performance stabilization and feedback control problem, have been obviously improved the Development Level of China's electronic analytical balance, have made me
State in the development of the electronic balance of a ten thousandth precision already close to world lead level, but due to by material and precision
The limitation such as manufacturing process, the consistency of China's electronic balance still have difference compared with international most advanced level instrument performance with reliability
Away from still there is many technologies to need to be studied and be further improved.
Summary of the invention
In view of the above technical problems, the present invention provides a kind of electromagnetic balance formula force snesor based on optical lever, dexterously
The Opto-electrical Section for replacing existing electronic analytical balance for displacement detecting with the displacement detection system that optical lever and PSD element form
System, by the way that feed rod pole technology and PSD element are blended with electro magnetic force sensor, further promotes existing electronic analytical balance
Sensitivity.
The electronic balance for the electromagnetic balance formula force snesor that the present invention also provides a kind of including described based on optical lever.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of electromagnetic balance formula force snesor based on optical lever, including optical lever, PSD element, electromagnetic coil and closed loop
Detection system；
The optical lever reflects the light on PSD element for generating light beam；
The PSD element is used to detect the displacement of optical lever reflection light point；
The PSD element is connect with closed loop detection system, and the closed loop detection system is connect with electromagnetic coil.
In above scheme, the optical lever includes laser, light reflection mirror, condenser lens and optical filtering；
The light reflection mirror is used for the laser beam that reflection laser generates, and the condenser lens and optical filtering are in light reflection mirror
In the optical path of the light beam emitted, light beam through reflection is radiated on the PSD element.
In above scheme, the electromagnetic coil be in permanent magnetism, magnetic yoke generate magnetic field radially in.
In above scheme, the input terminal of the closed loop detection system is connect with the output of PSD element, closed loop detection system
Output end is connect with electromagnetic coil, and the electromagnetic coil is connect with sample resistance.
In above scheme, the closed loop detection system includes signal processing circuit；
The signal processing circuit includes sequentially connected voltage amplification, power amplification and PID circuit.
A kind of electronic balance, including the electromagnetic balance formula force snesor based on optical lever.
In above scheme, the light reflection mirror and electromagnetic coil are placed in one end of electronic balance horizontal gird；
The objective table of electronic balance is placed in the other end of the horizontal gird.
It further include single-chip microcontroller and display in above scheme；
The signal of the sample resistance output is defeated by single-chip microcontroller after processing, and the single-chip microcontroller is connect with display.
Compared with prior art, the beneficial effects of the present invention are:
1. the displacement detection system that the present invention utilizes optical lever and PSD element to form replaces existing electronic analytical balance to be used for
The electro-optical system of displacement detecting is further promoted existing by the way that feed rod pole technology and PSD element are blended with electro magnetic force sensor
There is the sensitivity of electronic analytical balance.
2. the present invention does not change the structure and crossbeam link mechanism of the electromagnetic coil of primary electron assay balance, using with light
The feed rod pole technology of amplification replaces original displacement detector；By feed rod pole technology and PSD element and electromagnetic force
Sensor blends, and the laser of the optical lever emits laser beam, which reflexes to a PSD element by reflecting mirror
On, when setting a determinand on objective table, crossbeam can generate instantaneous displacement, change the reflection light point position on PSD element
Become, this displacement variable can be provided by PSD element, and the present invention is higher to displacement detection precision caused by measured object, therefore
The sensitivity of electronic analysis level can be improved.
3. the present invention replaces photocell using PSD element, PSD element is realized to optical lever reflection light point displacement detecting.
4. the present invention replaces original photocell signal processing circuit with PSD signal processing circuit.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is traditional electromagnetic balance formula force snesor detection schematic diagram；
Fig. 2 is the photoelectric detection part of traditional electromagnetic balance formula force snesor displacement detecting；
Fig. 3 is the testing principle signal of the electromagnetic balance formula force snesor using optical lever of an embodiment of the present invention
Figure；
Fig. 4 is the amplification schematic diagram for the displacement that optical lever of the present invention generates crossbeam；
Fig. 5 is PSD element signal processing circuit schematic diagram of the present invention.
In figure, 1, determinand；2, objective table；3, vertical support rod；4, horizontal support bar；5, horizontal support bar spring；6,
Crossbeam；7, photoelectric displacement detection device, 8, strut；9, strut spring；10, coil brace；11, electromagnetic coil；12, permanent magnetism；13,
Magnetic yoke；14, stand connection；15, photo-electroluminescence pipe；16, with the diaphragm of rectangular notch；17, photoelectric converter A；18, photoelectricity turns
Parallel operation B；19, hot spot when diaphragm is in beam central；20, the hot spot after stop shift；21, reflecting mirror；22, laser；23, thoroughly
Mirror；24, optical filter；25, PSD element；26, luminous point；27, divider.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
The orientation or positional relationship of the instructions such as " thickness ", "upper", "lower", " axial direction ", " radial direction ", "vertical", "horizontal", "inner", "outside"
To be based on the orientation or positional relationship shown in the drawings, be merely for convenience of description of the present invention and simplification of the description, rather than indicate or
It implies that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as
Limitation of the present invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be with
Explicitly or implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or
Two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine
Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary
Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be
Concrete meaning in bright.
Fig. 3 show a kind of embodiment of the electromagnetic balance formula force snesor of the present invention based on optical lever, described
Electromagnetic balance formula force snesor based on optical lever includes optical lever, PSD element 25, electromagnetic coil 11 and closed loop detection system.
The optical lever reflects the light on PSD element 25 for generating light beam；
The PSD element 25 is for detecting the displacement for reflexing to luminous point 26 on PSD element 25 through optical lever；
The PSD element 25 is connect with closed loop detection system, and the closed loop detection system is connect with electromagnetic coil 11.
The optical lever includes laser 22, reflecting mirror 21, condenser lens 23 and optical filtering 24；The laser 22 is half
Conductor laser, for generating laser beam；The light reflection mirror 21 is used for the laser beam that reflection laser 22 generates, the focusing
In the optical path for the light beam that light reflection mirror 21 is emitted, the condenser lens 23 is realized to laser 22 for lens 23 and optical filtering 24
The focusing of generated light beam, the optical filtering 24 realize the filtering to ambient light；Light beam through reflection is radiated at the PSD member
On part 25.Reflection light path in the optical lever optical path is greater than incident light path, plays the role of displacement enlargement.The optical filtering 24
In reflected light path, play the role of eliminating stray light in the optical path.The reflecting mirror 21 is plane mirror, is placed in crossbeam
6 upper surface, the incident light emitted from laser 22 obtain reflected light through the reflection of reflecting mirror 21.The PSD element 25 is one-dimensional
Position sensitive detector, can 26 position of luminous point to reflected light accurately measured.
The electromagnetic coil 11 be in permanent magnetism 12, magnetic yoke 13 generate Constant charge soil in；The permanent magnetism 12 be NdFeB permanent magnetism,
Magnetic yoke 13 is silicon steel soft magnetism.
The input terminal of the closed loop detection system is connect with the output of PSD element 25, the output end of closed loop detection system with
Electromagnetic coil 11 connects, and the electromagnetic coil 11 is connect with sample resistance, sample resistance one end ground connection.
The closed loop detection system includes signal processing circuit；The signal processing circuit includes that sequentially connected voltage is put
Greatly, power amplification and PID circuit.
Electromagnetic balance formula force snesor of the present invention based on optical lever, should by one laser beam of semiconductor laser
Laser beam is reflexed on a PSD element 25 by being placed in the reflecting mirror 21 of 6 end of crossbeam.When setting a determinand 1 on objective table 2
When, crossbeam 6 can generate instantaneous displacement, so that 26 position of reflection light point on PSD element 25 is changed, this displacement variable can
It is provided by PSD element 25.By the optical path of Fig. 3 as it can be seen that the optical path has displacement equations effect, because of referred to herein as optical lever.It utilizes
Displacement equations can be further increased the sensitive of electronic balance under the premise of not extending electronic balance 6 length of crossbeam by optical lever
Degree.
A kind of electronic balance, including the electromagnetic balance formula force snesor based on optical lever.
The light reflection mirror 21 and electromagnetic coil 11 are placed in one end of electronic balance horizontal gird 6；The loading of electronic balance
Platform 2 is placed in the other end of the horizontal gird 6.
The electronic balance further includes single-chip microcontroller and display；The voltage signal that the sample resistance both ends obtain passes through place
Single-chip microcontroller is sent to using converter after reason, and the single-chip microcontroller is connect with display, and the display is tested for showing
The quality of object.
As shown in figure 4, the vertical support rod 3 will decline when applying the determinand 1 of certain mass on objective table 2, make
The right end of crossbeam 6 moves up, and then reflecting mirror 21 is driven to move up together, changes the incidence angle of the incident light emitted by laser 22
Become, the angle of reflection of the reflected light after collector lens 23 and optical filtering 24 also changes, so that luminous point 26 be made to be radiated at PSD member
Position on part 25 changes, and due to using optical lever, so that shift value is amplified, to enable electronic balance sensitivity
It improves.
Fig. 5 show the signal processing circuit schematic diagram that position sensitive detector PSD element 25 detects 26 position of luminous point, luminous point
The current signal that 26 positions determine becomes voltage signal e after current/voltage converteraAnd eb, using addition and subtraction circuit
Signal afterwards gives divider 27, can eliminate the mistake of displacement measurement caused by 26 brightness change of luminous point to a certain extent in this way
Difference.
Reflecting mirror 21 of the present invention is located on crossbeam 6, and an electromagnetic coil 11 is disposed on crossbeam 6, and electromagnetic coil 11 is in
In the magnetic field that permanent magnet and soft-magnetic yoke are constituted, the electromagnetic coil 11 of energization is acted in magnetic field by Ampere force, the power of the power
The torque that the quality of square and determinand 1 generates balances each other, and the light reflected through reflecting mirror 21 focuses through collector lens 23 again, filters
Mirror 24 projects on PSD element 25 after filtering, and the mass change of determinand 1 then causes luminous point 26 mobile, exports on PSD element 25
Voltage is amplified and is fed back in electromagnetic coil 11 again after PID circuit, and Ampere force change can be such that balance balances again, pass through detection
The quality of testee is obtained with the voltage on the sample resistance of coil series winding.
Detection gearshift used of the invention, hence it is evident that be different from shown in Fig. 2 using photronic mode in the prior art.
It in Fig. 4, is located under the action of gravity F, 6 right end of crossbeam produces displacement d, and the displacement is through feed rod designed in figure
After the effect of bar, corresponding displacement is L, as seen from the figure L > > d on PSD element 25, illustrate to use optical lever can significantly improve by
Displacement caused by gravity F caused by 1 mass of determinand that objective table 2 is placed, displacement increase, so that electronic balance
Detection sensitivity is improved.
Although not each embodiment only includes one it should be appreciated that this specification describes according to various embodiments
A independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should will say
As a whole, the technical solutions in the various embodiments may also be suitably combined for bright book, and forming those skilled in the art can be with
The other embodiments of understanding.
The series of detailed descriptions listed above are illustrated only for possible embodiments of the invention,
The protection scope that they are not intended to limit the invention, it is all without departing from equivalent embodiment made by technical spirit of the present invention or change
It should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of electromagnetic balance formula force snesor based on optical lever, which is characterized in that including optical lever, PSD element (25), electricity
Magnetic coil (11) and closed loop detection system；
The optical lever reflects the light on PSD element (25) for generating light beam；
The PSD element (25) is used to detect the displacement of optical lever reflection light point (26)；
The PSD element (25) connect with closed loop detection system, and the closed loop detection system is connect with electromagnetic coil (11).
2. the electromagnetic balance formula force snesor according to claim 1 based on optical lever, which is characterized in that the optical lever
Including laser (22), light reflection mirror (21), condenser lens (23) and optical filtering (24)；
The light reflection mirror (21) is used for the laser beam that reflection laser (22) generate, the condenser lens (23) and optical filtering
(24) in the optical path for the light beam that light reflection mirror (21) is emitted, light beam through reflection is radiated on the PSD element (25).
3. the electromagnetic balance formula force snesor according to claim 1 based on optical lever, which is characterized in that the electromagnetic wire
Circle (11) be in permanent magnetism (12), magnetic yoke (13) generation radially magnetic field in.
4. the electromagnetic balance formula force snesor according to claim 1 based on optical lever, which is characterized in that the closed loop inspection
The input terminal of examining system is connect with the output of PSD element (25), and the output end of closed loop detection system is connect with electromagnetic coil (11),
The electromagnetic coil (11) connect with sample resistance.
5. the electromagnetic balance formula force snesor according to claim 1 based on optical lever, which is characterized in that the closed loop inspection
Examining system includes signal processing circuit；
The signal processing circuit includes sequentially connected voltage amplification, power amplification and PID circuit.
6. a kind of electronic balance, which is characterized in that flat including the electromagnetism based on optical lever described in claim 1-5 any one
Weighing apparatus formula force snesor.
7. electronic balance according to claim 6, which is characterized in that the light reflection mirror (21) and electromagnetic coil (11) are set
In one end of electronic balance horizontal gird (6)；
The objective table (2) of electronic balance is placed in the other end of the horizontal gird (6).
8. electronic balance according to claim 6, which is characterized in that further include single-chip microcontroller and display；
The voltage signal that the sample resistance both ends obtain is by sending single-chip microcontroller, the list to using converter after processing
Piece machine is connect with display.
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| CN201910406330.3A CN110207859A (en) | 2019-05-15 | 2019-05-15 | A kind of electromagnetic balance formula force snesor and electronic balance based on optical lever |
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Cited By (2)
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| CN111257532A (en) * | 2020-03-30 | 2020-06-09 | 郑州轻工业大学 | Information processing platform for information measurement |
| CN113624309A (en) * | 2021-08-16 | 2021-11-09 | 江苏大学 | Magnetic suspension weighing system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111257532A (en) * | 2020-03-30 | 2020-06-09 | 郑州轻工业大学 | Information processing platform for information measurement |
| CN113624309A (en) * | 2021-08-16 | 2021-11-09 | 江苏大学 | Magnetic suspension weighing system and control method thereof |
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Application publication date: 20190906 |