CN104849496A - High impact acceleration detecting method and sensor based on corona discharge principle - Google Patents
High impact acceleration detecting method and sensor based on corona discharge principle Download PDFInfo
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Abstract
The invention proposes a high impact acceleration detecting method and a high impact acceleration sensor based on a corona discharge principle. A similarity between the high impact acceleration sensor and a thermal convection type acceleration sensor is that both sensors adopt gas as a ''detection mass block'' while adopting completely different detection principles. The high impact acceleration detecting method and the high impact acceleration sensor utilizes the principle that variations of gas pressure and corona discharge characteristics are caused by acceleration, and detects the acceleration through detecting pulse repetition frequency of a discharge current. The core structure of the high impact acceleration sensor is of a pin-board corona discharge structure, the structure is concise, the process is simple and the cost is low. The high impact acceleration detecting method utilizes the gas partial micro ionization characteristic, and has fast response speed; the acceleration measurement is converted into differential frequency measurement, the results are output in a digital way, the circuit is simple, and the anti-interference capability is strong.
Description
Technical field
The present invention relates to sensor technical field, particularly relate to a kind of high-impact acceleration detection method and acceleration transducer.
Background technology
Acceleration transducer is widely used in industry, national defence, the field such as civilian.Acceleration transducer is of a great variety, different according to sensing principle, mainly contains condenser type, inductance type, pressure resistance type, piezoelectric type, tunnel effect type and heat convection type etc.High-impact acceleration sensor for the particular application such as large impact, high overload then mainly contains pressure resistance type, piezoelectric type, condenser type and heat convection type.Non-patent literature 1 [Li Kejie, what Xu, Zhang Zhen sea etc., high-impact acceleration sensor current situation and trend, detection and control journal, 2013,35 (4), 6-10] is summarized all kinds of high-impact acceleration sensor.Wherein, the mainly pressure resistance type of commercialization both at home and abroad, heat convection type and condenser type high-impact acceleration sensor, as the 7270A series piezoresistive acceleration sensor that ENDEVCO company of the U.S. produces, range can reach 200,000 g; The serial thermal convection acceleration sensor such as MXA, MXD that MEMSIC company produces, most high overload can reach 50,000 g.
Pressure resistance type high-impact acceleration sensor has can with the solid masses block of micro-beam movement, structure relative complex, and temperature influence is larger.Condenser type high-impact acceleration sensor poor linearity, signal processing circuit is complicated, is subject to effect of parasitic capacitance.There is not solid Detection job block in heat convection type high-impact acceleration sensor, but using virtual " hot gas group " as " mass ", environmental suitability and impact resistance stronger.But the necessary integrated heater of the type acceleration transducer and temperature sensor, structure relative complex, testing circuit relative complex.
Summary of the invention
For overcoming the weak point of prior art, the present invention proposes a kind of high-impact acceleration detection method adopting principle of corona discharge, has that cost is low, impact resistance is high, the simple feature of input.
The present invention is achieved through the following technical solutions:
A kind of high-impact acceleration sensor based on principle of corona discharge, described acceleration transducer is single shaft high-impact acceleration sensor, and described sensor comprises direct voltage source #1, direct voltage source #2, current-limiting resistance #1, current-limiting resistance #2, needlepoint electrode #1, needlepoint electrode #2, electrode support #1, electrode support #2, plate electrode #1, plate electrode #2, seal chamber, sampling resistor #1, sampling resistor #2 and signal deteching circuit; Wherein, described direct voltage source, current-limiting resistance, needlepoint electrode, electrode support, plate electrode, sampling resistor form corona discharge structure; Described electrode support is electrical insulator, is connected with seal chamber, ensures hermetic seal, forms an annular seal space; Plate electrode #1 and plate electrode #2 is positioned at annular seal space, and described plate electrode all has hole, and gas can pass freely through; Described plate electrode is connected with electrode support; Described needlepoint electrode through-electrode supporter also ensures hermetic seal; Described plate electrode is connected with sampling resistor after also being drawn through electrode support by wire; Size of current when described current-limiting resistance surprisingly punctures completely for the air gap limited between needle to board electrode; Described signal deteching circuit connects sampling resistor #1, sampling resistor #2 respectively, detects, and then measure accekeration to the Trichel pulse signal of two-way corona discharge structure.
As a further improvement on the present invention, described signal deteching circuit comprises operational amplification circuit #1, operational amplification circuit #2, shaping circuit #1, shaping circuit #2 and frequency measurement circuit; Two-way Trichel pulse signal suitably amplifies respectively through operational amplification circuit #1 and operational amplification circuit #2 by described signal deteching circuit, and then be shaped as square-wave signal through shaping circuit #1 and shaping circuit #2, eventually pass the difference Δ F that frequency measurement circuit calculates two-way Trichel pulse frequency, and then detect the size of acceleration a.
On the other hand, the invention provides a kind of high-impact acceleration sensor based on principle of corona discharge, described sensor is three axle high-impact acceleration sensors, in a hexahedron seal chamber, each is designed a set of identical corona discharge structure respectively, and described corona discharge structure is made up of direct voltage source, current-limiting resistance, needlepoint electrode, electrode support, plate electrode, sampling resistor; Described electrode support is electrical insulator, is connected with hexahedron seal chamber, ensures hermetic seal, forms an annular seal space; Described plate electrode is all positioned at annular seal space, and described plate electrode all has hole, and gas can pass freely through; Described plate electrode is connected with electrode support; Described needlepoint electrode through-electrode supporter also ensures hermetic seal; Described plate electrode is connected with sampling resistor after also being drawn through electrode support by wire; Size of current when described current-limiting resistance surprisingly punctures completely for the air gap limited between needle to board electrode; Described signal deteching circuit connects the sampling resistor in each face respectively, detects, and then measure the accekeration on three direction of principal axis to the Trichel pulse signal of the corona discharge structure in six faces.
As a further improvement on the present invention, described signal deteching circuit comprises operational amplification circuit, shaping circuit and frequency measurement circuit; The two-way Trichel pulse signal of X-axis, Y-axis and Z axis suitably amplifies respectively through operational amplification circuit by described signal deteching circuit respectively, and then be shaped as square-wave signal through shaping circuit, eventually pass the difference Δ F that frequency measurement circuit calculates the two-way Trichel pulse frequency on this axle, and then detect the size of the acceleration a on this axle.
As a further improvement on the present invention, described annular seal space space blanketing gas medium, described gas medium is for comprising electronegative gas.
On the other hand, the invention provides a kind of high-impact acceleration detection method based on principle of corona discharge, it is characterized in that: described method, based on acceleration transducer of the present invention, said method comprising the steps of:
Receive the two-way Trichel pulse signal that sampling resistor obtains;
Through operational amplification circuit, described Trichel pulse signal is suitably amplified;
Square-wave signal is shaped as through shaping circuit;
Frequency measurement circuit calculates the difference Δ F of two-way Trichel pulse frequency;
According to Δ F; Detect the size of acceleration a.
The invention has the beneficial effects as follows: the high-impact acceleration detection method based on principle of corona discharge that the present invention proposes and acceleration transducer, the place similar with heat convection type acceleration transducer all adopts gas as " Detection job block ", but Cleaning Principle is completely different: the present invention utilizes acceleration to cause gas pressure intensity to change and the principle causing corona discharge characteristic to change, carry out sense acceleration eventually through detection discharge current pulse repetition frequency.The core texture of acceleration transducer of the present invention is pin-plate corona discharge structure, and structure is succinct, and technique is simple, and cost is low.The high-impact acceleration detection method that the present invention proposes utilizes the micro-ionization feature in gas local, fast response time; Degree of will speed up is measured and is converted into differential frequency measurement simultaneously, and direct digitization exports, and circuit is simple, and antijamming capability is strong.
Accompanying drawing explanation
Fig. 1 is the corona discharge structure principle schematic that negative dc voltage that the present invention utilizes is powered;
Fig. 2 is the corona discharge structure principle schematic that positive direct-current voltages that the present invention utilizes is powered;
Fig. 3 is the schematic diagram of single shaft high-impact acceleration sensor of the present invention;
Fig. 4 is the block diagram of signal deteching circuit of the present invention;
Fig. 5 is the schematic diagram of three axle high-impact acceleration sensors of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Corona discharge type acceleration transducer and the similar place of heat convection type acceleration transducer of the present invention's design all adopt gas as " Detection job block "; But Cleaning Principle is completely different.Heat convection type acceleration transducer utilizes acceleration to cause gaseous exchange to change and causes the principle of temperature variation, carrys out sense acceleration eventually through detected temperatures difference.The corona discharge type acceleration transducer that the present invention proposes is then utilize acceleration to cause gas pressure intensity to change and the principle causing corona discharge characteristic to change, and carrys out sense acceleration eventually through detection discharge current frequency.
Corona discharge type high-impact acceleration detection side ratio juris is as follows:
Corona discharge is a kind of common gas partial ionization electric discharge phenomena, usually occur in have highfield distribution small curvature radius energized conductor around.Corona discharge, according to the difference of configuration, has different discharge types.The discharge type that the present invention utilizes is Trichel pulse electric discharge (Trichel pulse discharge) in negative DC corona discharge, its discharging structure as shown in Figure 1,101 is direct voltage source, 102 is current-limiting resistance, 103 for having the needlepoint electrode of small curvature radius, and 104 is electronegative gas gap, and 105 is plate electrode, 106 is sampling resistor, and 107 is signal deteching circuit.Wherein, direct voltage source 101 exports negative voltage.Also can adopt the direct voltage source that positive voltage exports, its discharging structure can be changed into as shown in Figure 2.In accompanying drawing 2,201 is direct voltage source, and 202 is current-limiting resistance, and 203 is plate electrode, and 204 is electronegative gas gap, and 205 for having the needlepoint electrode of small curvature radius, and 206 is sampling resistor, and 207 is signal deteching circuit.Discharging structure shown in accompanying drawing 1 with accompanying drawing 2 except power supply output polarity different, outside the difference of signal sampling position, principle does not have essential distinction.
According to pik criterion (Peek ' s law), corona discharge initial conditions are:
In above formula, E
sfor initial electric field, E
0the ionizing electric field relevant with gaseous species, for air, E
0=30 ~ 32kV/cm, c are the constants relevant with size, are about 0.301cm
1/2, m
0the constant relevant with needle surface, for smooth surface m
0=1, r is needle point radius-of-curvature, and δ is opposing gas density.
Corona inception voltage can be expressed as:
V
s＝E
srln(2d/r) (2)
In above formula, V
sfor starting potential, d is pin-distance between plates.Formula (1) is substituted into formula (2) can obtain:
After configuration is certain, starting potential V in above formula
sthe just function of opposing gas density δ, i.e. V
s=f (δ).Consider that opposing gas variable density is not very large, utilize Taylor's formula, by V
s=f (δ) in δ=1 place first approximation is:
V
s＝E
0m
0ln(2d/r)(r+0.5cr
3/2)δ+E
0m
0cln(2d/r)(0.5r
3/2-r
1/2)＝k
1δ+b
1(4)
In above formula, k
1=E
0m
0ln (2d/r) (r+0.5cr
3/2), b
1=E
0m
0cln (2d/r) (0.5r
3/2-r
1/2).Opposing gas density δ can be expressed as:
In above formula, ρ is gas density, ρ
0for gas density under standard conditions, P and T is respectively gas pressure intensity and temperature, P
0and T
0be respectively normal pressure and temperature.Starting potential V
sthe function of pressure P can be expressed as further:
Trichel pulse most important feature of discharging be discharge current is periodic current impulse, is called Trichel pulse (Trichel pulse).Trichel pulse repetition frequency can be expressed as:
F＝k
2V
a(V
a-V
s)/(rd
2) (7)
In above formula, F is Trichel pulse repetition frequency, k
2configure relevant constant, V with electrode structure
afor outside applies voltage.Formula (6) is substituted into formula (7), and Trichel pulse frequency can be expressed as:
In above formula,
The circuit theory that acceleration detection method of the present invention adopts as shown in Figure 3,301 is direct voltage source #1,302 is current-limiting resistance #1,303 is needlepoint electrode #1,304 is electrode support #1, and 305 is plate electrode #1, and 306 is attachment screw, 307 is seal chamber, 308 is needlepoint electrode #2, and 309 is electrode support #2, and 310 is plate electrode #2,311 is current-limiting resistance #2,312 is direct voltage source #2, and 313 is sampling resistor #2, and 314 is sampling resistor #1,315 is signal deteching circuit, and 316 is gas medium.Wherein, electrode support 304,310 is electrical insulator, and is connected by screw with seal chamber 307, ensures hermetic seal, forms an annular seal space.Plate electrode #1 and plate electrode #2 is positioned at annular seal space, and plate electrode #1 and plate electrode #2 has hole, and gas can pass freely through.Plate electrode is connected by screw with electrode support (or by bonding, ensureing enough firmly).As long as needlepoint electrode through-electrode supporter also ensures hermetic seal.Plate electrode is connected with sampling resistor after also being drawn through electrode support by wire.Wire ensures hermetic seal through during electrode support.Visible, comprise the corona discharge structure shown in the identical accompanying drawing of two covers 1 in the technical scheme shown in accompanying drawing 3.Also corona discharge structure can be configured to the structure shown in accompanying drawing 2.
Accompanying drawing 4 is the block diagram of the signal deteching circuit 315 in accompanying drawing 3, wherein 401 and 404 is respectively operational amplification circuit #1 and operational amplification circuit #2, and 402 and 404 are respectively shaping circuit #1 and shaping circuit #2, and 405 is frequency measurement circuit.
When whole airtight cavity does not exist acceleration, respectively evenly, the Trichel pulse frequency that corona discharge structure #1 and corona discharge structure #2 detects is equal for gas pressure intensity; When airtight cavity exists transverse acceleration a, the gas in cavity will redistribute in acceleration effect, cause the pressure around needlepoint electrode #1 and needlepoint electrode #2 two place to change.During balance, can think that the pressure difference Δ P at needlepoint electrode #1 and needlepoint electrode #2 two place meets relation:
ΔP∝a (9)
And establish Δ P=k
4a, k
4for coefficient.Therefore, when there is transverse acceleration a, the Trichel pulse difference on the frequency Δ F that corona discharge structure #1 and corona discharge structure #2 detects is:
ΔF＝2k
3k
4a (10)
Namely Trichel pulse difference on the frequency is directly proportional to acceleration, by the difference of the pulsed frequency of variate corona discharge structure #1 and corona discharge structure #2, can detect the size of acceleration.
Specific embodiment 1
Accompanying drawing 3 is the schematic diagram of single shaft high-impact acceleration sensor of the present invention.Direct voltage source #1301 is identical direct voltage source with direct voltage source #2 312, and its effect is to provide constant DC voltage.Current-limiting resistance #1 302 is identical resistance with current-limiting resistance #2 311, the size of current of its effect when to be that the air gap between restriction needle to board electrode is unexpected puncture completely, protection circuit loop.The resistance of current-limiting resistance selects more than general k Ω level.Needlepoint electrode #1 303 is identical needlepoint electrode with needlepoint electrode #2 308.The material of needlepoint electrode is not limit, as long as have the conductive tip of small curvature radius, and such as common embroidery draw point or the super tip adopting micro-nano technology technique to make.In corona discharge process, the surface configuration of needlepoint electrode is most important, very large on flash-over characteristic impact.From principle analysis above, the most important parameter of needlepoint electrode is radius-of-curvature r.Generally speaking, when other condition is constant, needle point radius-of-curvature r is less, corona inception voltage V
sless, the outside that during normal work, direct voltage source need provide applies voltage V
aless.Preferably, needle point radius-of-curvature r is a μm magnitude, even nm magnitude, and concrete value need consider.Insulator 307 material is not limit, and its Main Function is electric insulation and cavity sealing.
Plate electrode #1 305 is identical plate electrode with plate electrode #2 310, and material is not limit, but requirement can be conducted electricity; Electrode has the hole in suitable aperture simultaneously, allows gas medium freely to pass through.The size of plate electrode does not too much limit, and can not produce material impact to corona discharge characteristic.Plate electrode size Selection generally needs to determine according to overall sensor size and pin-distance between plates d.Preferably, the dimension of plate electrode should be greater than 10d.Pin-distance between plates d is also the important parameter affecting corona discharge.As principle analysis is known above, generally speaking, when other condition is constant, pin-distance between plates d is less, starting potential V
sless.Preferably, pin-distance between plates d is mm magnitude, even μm magnitude, and concrete value need consider.
Gas medium 316 is full of whole closed chamber space.The condition that gas medium need meet comprises electronegative gas, as oxygen O
2, sulfur hexafluoride SF
6, air etc., it is air that typical case selects.In order to increase the sensitivity of acceleration detection, can consider to introduce the larger gas componant of molecular weight.In confined space, the selection of initial gas pressure does not too much limit, in theory from infrabar to hyperbar.But the size of initial gas pressure is comparatively large to the properties influence of corona discharge, and from principle analysis above, generally speaking, when other condition is constant, initial gas pressure is larger, starting potential V
slarger.The common value of initial gas pressure is 1atm (atmospheric pressure), and its concrete value need consider.
Sampling resistor #1 314 is identical resistance with sampling resistor #2 313, and its effect obtains Trichel pulse signal by sampling resistor, and its value can be hundreds of Ω to tens k Ω.Due to the initial discharge form that Trichel electric discharge is negative corona discharge, belong to faint shelf depreciation, average discharge current is less, be generally μ A ~ mA order of magnitude, this depends primarily on the voltage swing etc. of electrode configuring condition (pin-distance between plates size, needle point radius-of-curvature size) and direct voltage source applying.The electric capacity that the large I of concrete resistance of sampling resistor is formed according to needle to board electrode in discharge current and discharge loop is selected, to carry out the detection of Trichel pulse current signal.
As shown in Figure 4, its effect mainly carries out frequency measurement to two-way Trichel pulse signal to signal deteching circuit 315.The important feature of Trichel pulse is that rising edge of a pulse is extremely precipitous, and negative edge is relatively slow, and pulse width is much smaller than the recurrence interval.Usually, pulse width is ns magnitude level, and the recurrence interval is μ s magnitude.Meanwhile, Trichel pulse amplitude is general less, is mV magnitude.Conveniently ranging pulse repetition frequency, two-way Trichel pulse signal suitably can be amplified respectively through operational amplification circuit #1401 and operational amplification circuit #2 403, and then be shaped as square-wave signal through shaping circuit #1 402 and shaping circuit #2 404, eventually pass the difference Δ F that frequency measurement circuit 405 calculates two-way Trichel pulse frequency, and then the size of acceleration a can be detected.The technology of the operational amplification circuit in accompanying drawing 4, shaping circuit and frequency measurement circuit realizes difficulty and little, the circuit that circuit common designing technique personnel utilize the professional knowledge in its field can design content with funtion to require.
Specific embodiment 2
According to method of the present invention, be easy to structure three axle high-impact acceleration sensor.On the single shaft corona discharge type high-impact acceleration sensor basis shown in accompanying drawing 3, be easy to build 3-axis acceleration sensor.In a hexahedron cavity, each is designed a set of identical corona discharge structure respectively, and every two relative faces form the acceleration analysis in x, y, z three directions respectively.Accompanying drawing 5 is a kind of form of three axle corona discharge type high-impact acceleration sensors, four faces (x with z direction) only depicted in figure in hexahedron have dispensed other circuit part (circuit part of every one side is identical with accompanying drawing 3, and the port number of signal deteching circuit increases to 6) simultaneously.501 is needlepoint electrode #1, and 502 is electrode support #1, and 503 is plate electrode #1,504 is attachment screw, and 505 is hexahedron support frame, and 506 is needlepoint electrode #2,507 electrode support #2,508 is plate electrode #2, and 509 is needlepoint electrode #3, and 510 is electrode support #3,511 is plate electrode #3,512 is needlepoint electrode #4, and 513 is electrode support #4, and 514 is plate electrode #4.515 is gas medium.Wherein, all plate electrodes such as 503 plate electrode #1,508 plate electrode #2,511 plate electrode #3,514 plate electrode #4 all have hole, allow gas freely to pass through.Plate electrode is connected by screw with electrode support (or by bonding, ensureing enough firmly).All electrode supports are electrical insulator, and are connected by screw with hexahedron support frame, ensure hermetic seal simultaneously.As long as all needlepoint electrode through-electrode supporters also ensure hermetic seal.
The core texture of the high-impact acceleration sensor of the present invention's design is pin-plate corona discharge structure, and structure is succinct, and technique is simple, and cost is low.The high-impact acceleration detection method that the present invention proposes utilizes the micro-ionization feature of gas, fast response time; Degree of will speed up is measured and is converted into differential frequency measurement simultaneously, and direct digitization exports, and circuit is simple, and antijamming capability is strong.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. the high-impact acceleration sensor based on principle of corona discharge, it is characterized in that, described sensor comprises direct voltage source #1, direct voltage source #2, current-limiting resistance #1, current-limiting resistance #2, needlepoint electrode #1, needlepoint electrode #2, electrode support #1, electrode support #2, plate electrode #1, plate electrode #2, seal chamber, sampling resistor #1, sampling resistor #2 and signal deteching circuit; Wherein, described direct voltage source, current-limiting resistance, needlepoint electrode, electrode support, plate electrode, sampling resistor form corona discharge structure; Described electrode support is electrical insulator, is connected with seal chamber, ensures hermetic seal, forms an annular seal space; Plate electrode #1 and plate electrode #2 is positioned at annular seal space, and described plate electrode all has hole, and gas can pass freely through; Described plate electrode is connected with electrode support; Described needlepoint electrode through-electrode supporter also ensures hermetic seal; Described plate electrode is connected with sampling resistor after also being drawn through electrode support by wire; Size of current when described current-limiting resistance surprisingly punctures completely for the air gap limited between needle to board electrode; Described signal deteching circuit connects sampling resistor #1, sampling resistor #2 respectively, detects, and then measure accekeration to the Trichel pulse signal of two-way corona discharge structure.
2. high-impact acceleration sensor according to claim 1, is characterized in that: described signal deteching circuit comprises operational amplification circuit #1, operational amplification circuit #2, shaping circuit #1, shaping circuit #2 and frequency measurement circuit; Two-way Trichel pulse signal suitably amplifies respectively through operational amplification circuit #1 and operational amplification circuit #2 by described signal deteching circuit, and then be shaped as square-wave signal through shaping circuit #1 and shaping circuit #2, eventually pass the difference Δ that frequency measurement circuit calculates two-way Trichel pulse frequency
f, and then detect acceleration
asize.
3. the high-impact acceleration sensor based on principle of corona discharge, described sensor is three axle high-impact acceleration sensors, it is characterized in that, in a hexahedron seal chamber, each is designed a set of identical corona discharge structure respectively, and described corona discharge structure is made up of direct voltage source, current-limiting resistance, needlepoint electrode, electrode support, plate electrode, sampling resistor; Described electrode support is electrical insulator, is connected with hexahedron seal chamber, ensures hermetic seal, forms an annular seal space; Described plate electrode is all positioned at annular seal space, and described plate electrode all has hole, and gas can pass freely through; Described plate electrode is connected with electrode support; Described needlepoint electrode through-electrode supporter also ensures hermetic seal; Described plate electrode is connected with sampling resistor after also being drawn through electrode support by wire; Size of current when described current-limiting resistance surprisingly punctures completely for the air gap limited between needle to board electrode; Described signal deteching circuit connects the sampling resistor in each face respectively, detects, and then measure the accekeration on three direction of principal axis to the Trichel pulse signal of the corona discharge structure in six faces.
4. high-impact acceleration sensor according to claim 3, is characterized in that: described signal deteching circuit comprises operational amplification circuit, shaping circuit and frequency measurement circuit; The two-way Trichel pulse signal of X-axis, Y-axis and Z axis suitably amplifies respectively through operational amplification circuit by described signal deteching circuit respectively, and then be shaped as square-wave signal through shaping circuit, eventually pass the difference Δ that frequency measurement circuit calculates the two-way Trichel pulse frequency on this axle
f, and then detect the acceleration on this axle
asize.
5. the high-impact acceleration sensor according to any one of claim 1-4, is characterized in that: described annular seal space space blanketing gas medium, described gas medium is for comprising electronegative gas.
6. based on a high-impact acceleration detection method for principle of corona discharge, it is characterized in that: described method, based on the acceleration transducer as described in any one of claim 1-5, said method comprising the steps of:
Receive the two-way Trichel pulse signal that sampling resistor obtains;
Through operational amplification circuit, described Trichel pulse signal is suitably amplified;
Square-wave signal is shaped as through shaping circuit;
Frequency measurement circuit calculates the difference Δ of two-way Trichel pulse frequency
f;
According to Δ
f; Detect acceleration
asize.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110429827A (en) * | 2019-08-14 | 2019-11-08 | 山东理工大学 | A kind of superharmonic resonances signal frequency multiplication amplification frequency tuner |
| CN117250368A (en) * | 2023-11-17 | 2023-12-19 | 北京理工大学 | Turbine inlet and outlet flow velocity measuring device and total temperature calibration method |
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| JPS64996A (en) * | 1987-06-24 | 1989-01-05 | A T R Jido Honyaku Denwa Kenkyusho:Kk | Voice recognition system using vector quantization |
| JPH08180959A (en) * | 1994-12-20 | 1996-07-12 | Ulvac Japan Ltd | Corona polarization treating method and corona polarization device |
| CN201673169U (en) * | 2010-05-05 | 2010-12-15 | 襄阳精鑫电子设备制造有限公司 | Signal converting circuit of capacitance type acceleration transducer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1170067A (en) * | 1966-10-24 | 1969-11-12 | North American Aviation Inc | Accelerometer |
| SU492814A1 (en) * | 1974-04-18 | 1975-11-25 | Московский вечерний металлургический институт | Sensor acceleration "inplatron" |
| JPS64996A (en) * | 1987-06-24 | 1989-01-05 | A T R Jido Honyaku Denwa Kenkyusho:Kk | Voice recognition system using vector quantization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110429827A (en) * | 2019-08-14 | 2019-11-08 | 山东理工大学 | A kind of superharmonic resonances signal frequency multiplication amplification frequency tuner |
| CN110429827B (en) * | 2019-08-14 | 2021-05-25 | 山东理工大学 | Super harmonic resonance signal frequency doubling amplification frequency tuning device |
| CN117250368A (en) * | 2023-11-17 | 2023-12-19 | 北京理工大学 | Turbine inlet and outlet flow velocity measuring device and total temperature calibration method |
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|---|---|
| CN104849496B (en) | 2018-04-24 |
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