CN100478682C - Measuring transducer for fuel permittivity of aeroplane fuel tank and measuring instrument - Google Patents

Measuring transducer for fuel permittivity of aeroplane fuel tank and measuring instrument Download PDF

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Publication number
CN100478682C
CN100478682C CNB2007100570113A CN200710057011A CN100478682C CN 100478682 C CN100478682 C CN 100478682C CN B2007100570113 A CNB2007100570113 A CN B2007100570113A CN 200710057011 A CN200710057011 A CN 200710057011A CN 100478682 C CN100478682 C CN 100478682C
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China
Prior art keywords
composite plate
plate electrode
sensor
cable
circuit
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Expired - Fee Related
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CNB2007100570113A
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Chinese (zh)
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CN101034074A (en
Inventor
樊玉铭
王芸
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Tianjin University
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Tianjin University
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Priority to CNB2007100570113A priority Critical patent/CN100478682C/en
Publication of CN101034074A publication Critical patent/CN101034074A/en
Application granted granted Critical
Publication of CN100478682C publication Critical patent/CN100478682C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

This invention relates to a kind of airplane tank oil-burning dielectric constant measuring sensor and its measuring apparatus. The sensor include pedestal; pedestal set up mounting screw; mounting screw set up wiring card; wiring card fix cable; four corner of pedestal set up fixed bolt; fixed bolt dead joint composite plate pole, composite plate pole are equidistance spaced by insulating washer that set on fixed bolt; composite plate pole set up cable lug, connect with cable; Centre of pedestal set up clinch bolt, to fix protective cup out of composite plate pole. It also includes measuring apparatus of sensor, and frequency generator connects with sensor. Output of frequency generator connects with capacitance measurement transfer circuit; temperature measurement, compensation circuit and capacitancemeasurement transfer circuit shunting connect to data acquisition and handling circuit of singlechip. Data acquisition and handling circuit of singlechip connect with display.

Description

Fuel permittivity of aeroplane fuel tank survey sensor and measuring instrument thereof
Technical field
The present invention relates to a kind of fuel permittivity of aeroplane fuel tank survey sensor and measuring instrument thereof, belong to survey sensor and Instrument technology field.
Background technology
Must measure the specific inductive capacity of tested fuel oil when utilizing capacitance type sensor to measure the fuel load of tank wagon, oil tanker oceangoing ship and fuel tanker intermediate fuel oil amount.The metal tube electrode is adopted in the making of present condenser type fuel oil Medium Measurement sensor, and its density is all greater than 2.7Kg/m 3In order to guarantee the stable and reliability in dynamic application, require whole additional supporting structure to have enough weight, so that reach the strength and stiffness requirement of sensor stable application.Therefore, when being used to measure the fuel load of tank wagon, oil tanker oceangoing ship and fuel tanker intermediate fuel oil amount, the survey sensor volume of existing metal mold condenser type fuel oil medium is big, Heavy Weight and precision are low.
Summary of the invention
The object of the present invention is to provide a kind of fuel permittivity of aeroplane fuel tank survey sensor and measuring instrument thereof, in light weight, simple in structure, service-strong characteristics that this sensor and measuring instrument thereof have.
For achieving the above object, the present invention adopts following technical proposals to be realized.A kind of fuel permittivity of aeroplane fuel tank survey sensor, it is characterized in that, comprise base 3, be provided with mounting screw 1 at the two ends of base 3, this mounting screw 1 is provided with wiring card 2, wiring card 2 attached cables 10, four angles at base 3 are provided with set bolt 4, the fixedly connected at least 2 composite plate electrodes 5 of this set bolt, equally spaced between two adjacent composite plate electrodes by the insulating washer 8 that is located on the set bolt 4, be provided with cable thread tension disc 7 on an end of the composite plate electrode of odd number, the cable 10 fixing with wiring card 2 is connected; Also be provided with cable thread tension disc 7 on an end of the composite plate electrode of even number, the wiring card 2 fixing cables 10 on this cable thread tension disc 7 and the other mounting screw are connected; Center at base 3 also is provided with rivet 6, and this rivet is fixed in protective cover 9 outside the composite plate electrode 5.
Above-mentioned composite plate electrode is for applying the copper fiberglass composite plate electrode or the compound electroplax utmost point of carbon fiber.
The fuel permittivity of aeroplane fuel tank measuring instrument that comprises above-mentioned survey sensor, it is characterized in that, also comprise the frequency generator 11 that is connected with survey sensor, frequency generator output is joined with capacitance measurement translation circuit 12, temperature survey and compensating circuit 13 and capacitance measurement translation circuit 12 are connected in single-chip data acquisition treatment circuit 14, and single-chip data acquisition treatment circuit 14 is connected with display 15.
Above-mentioned frequency generator circuit comprises single chip machine controlling circuit, DAC circuit, phase shift regulating circuit, filtering circuit.
Above-mentioned capacitance measurement translation circuit comprises sensor measures capacitance, standard capacitance, operation amplifier circuit, filtering circuit, phase regulating circuit, ADC analog-to-digital conversion circuit, temperature measuring circuit, single-chip data treatment circuit.
The invention has the advantages that the deposited copper fiberglass composite plate electrode that is adopted or the carbon fiber combination electrode plate is in light weight, temperature coefficient is little.Therefore, sensor simple in structure, volume is little, in light weight and measurement performance is improved.The not only integrated degree height of the metering circuit that is adopted, and performance is more reliable and more stable.
Description of drawings
Fig. 1 is a fuel oil dielectric constant measurement sensor construction synoptic diagram of the present invention.
Fig. 2 is the structured flowchart of fuel oil decameter of the present invention.
Among the figure, 1 is mounting screw, and 2 is wiring card, 3 is base, and 4 is set bolt, and 5 is the composite plate electrode, 6 is rivet, and 7 is the cable thread tension disc, and 8 is insulating washer, 9 is protective cover, and 10 is cable, and 11 is frequency generator, 12 are the capacitance measurement translation circuit, 13 are temperature survey and compensating circuit, and 14 is the single-chip data acquisition treatment circuit, 15 displays.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified:
Fuel oil dielectric constant measurement sensor that is adopted among the present invention and measuring instrument thereof have overcome the shortcoming of existing metal medium survey sensor.Deposited copper glass mat or carbon fiber combination electrode sheet material that fuel oil dielectric constant measurement sensor of the present invention is adopted are compound substance (composite materials; Composite).This compound substance is through the produced a kind of new material of certain combination process by two or more material.Its advantage is that load-bearing capacity is strong, rigidity is big, density value is little, be about 60%~40% of aluminium, its specific strength and specific modulus are all than aluminium alloy height, and corrosion-resistant, antifatigue, damping property is good, self lubricity is good, have good electrical conductivity, the member manufacturing process is simple, and moulding process is good, draw materials convenience, low price.
Composite plate electrode 5 in the fuel oil dielectric constant measurement sensor shown in Figure 1 adopts four blocks of deposited copper glass mats, and it is the circle of 85mm for radius R, and thick H is 1mm, and the spacing between the pole plate is 6mm.By measuring principle as can be known, after this composite plate electrode immerses liquid medium, along with the fuel oil medium two interelectrode coverings, the electric capacity of survey sensor will change pro rata along with the difference of oily medium.Close between the electric capacity of Medium Measurement sensor and the medium and be:
C = ϵ 0 S h ϵ ;
In the formula: ε 0-specific inductive capacity, 8.8540F/m; The relative dielectric constant of ε-fuel oil medium, 2.08; The area of S-composite plate electrode, S=π R 2, mm 2R-battery lead plate radius; H-battery lead plate spacing.The electric capacity that has this formula can obtain the Medium Measurement sensor that is made of four identical pole plates is 209pf.The height of its sensor is 22mm, and whole height is less than 30mm.
The electrode that is adopted in general condenser type fuel oil medium sensor is an alloy aluminum comparatively little in the density metal, and its density is generally about 2.7.Therefore, big, the measuring accuracy of big, the complex structure of the capacitance level transducer weight of this metal material manufacturing, temperature coefficient is restricted.
Surveying instrument is loaded on the fuel oil specific inductive capacity sensor through phase adjusted and the stable 5V AC signal of filtering circuit generation by integrated DAC circuit of Single-chip Controlling again, the reverse input end of operational amplifier, backward end and standard capacitance of output terminal cross-over connection of operational amplifier are simultaneously received in the measurement electric capacity output of sensor.The output process wave filter of operational amplifier and ADC analog-to-digital conversion circuit are delivered to single-chip microcomputer and are carried out data processing.Temperature measuring circuit in the while metering circuit is also delivered to single-chip microcomputer with the temperature in the measuring process and is carried out data processing, and is indicated the data of tested fuel oil specific inductive capacity by display.
Fuel oil dielectric constant measurement sensor and two sensors of aluminum alloy round cartridge type capacitor dielectric survey sensor that the designed four identical pole plates of the present invention constitute are put in the casing of same aircraft fuel oil medium RP-2, and be placed in the temperature control box, compare.Design temperature changes between-55 ℃~125 ℃, and the output of measuring fuel oil specific inductive capacity RP-2 simultaneously changes.The measurement result of its fuel oil specific inductive capacity shows: fuel oil dielectric constant measurement sensor of the present invention and measuring instrument output maximum error are 0.0031, and its measuring accuracy is less than 0.15%; And the measuring accuracy of aluminum alloy round cartridge type electric capacity fuel oil dielectric constant measurement sensor is 0.29%; And when the measurement fuel oil in the fuel tank dropped to 250mm, the aluminum alloy round cartridge type capacitance measurement fuel oil specific inductive capacity sensor of 300mm length had been difficult to measure; When fuel oil dropped to 100mm once more in fuel tank, aluminum alloy round cartridge type fuel oil specific inductive capacity sensor can't be measured; Yet when fuel liquid level drops to 50mm, to highly having no effect for the fuel oil dielectric constant measurement sensor measurement specific inductive capacity of the present invention of 30mm.Illustrate that thus fuel oil dielectric constant measurement sensor of the present invention and measuring instrument thereof its performance in the measurement of aircraft fuel oil specific inductive capacity is better than original aluminum alloy round cartridge type fuel oil dielectric constant measurement sensor.
Because the material of sensor has had mass-produced material at home, draw materials conveniently, low price, functional.The sensor performance of made is reliable and stable.Therefore, this sensor can be widely used for national economy factory, enterprise and military in measure among the measurement of fuel oil specific inductive capacity of oil product.

Claims (2)

1. fuel permittivity of aeroplane fuel tank survey sensor, it is characterized in that, comprise base (3), be provided with mounting screw (1) at the two ends of base (3), this mounting screw (1) is provided with wiring card (2), wiring card (2) attached cable (10), four angles at base (3) are provided with set bolt (4), fixedly connected at least 2 deposited copper fiberglass composite plate electrodes of this set bolt or carbon fiber composite plate electrode (5), equally spaced between adjacent two deposited copper fiberglass composite plate electrodes or the carbon fiber composite plate electrode by the insulating washer (8) that is located on the set bolt (4), be provided with cable thread tension disc (7) on an end of the deposited copper fiberglass composite plate electrode of odd number or carbon fiber composite plate electrode, the cable (10) fixing with wiring card (2) is connected; Also be provided with cable thread tension disc (7) on an end of the deposited copper fiberglass composite plate electrode of even number or carbon fiber composite plate electrode, the fixing cable (10) of this cable thread tension disc (7) and the wiring card (2) on the other mounting screw is connected; Also be provided with rivet (6) at the center of base (3), this rivet is fixed in protective cover (9) and applies outside copper fiberglass composite plate electrode or the carbon fiber composite plate electrode (5).
2. one kind comprises the fuel permittivity of aeroplane fuel tank measuring instrument by the described survey sensor of claim 1, it is characterized in that, also comprise the frequency generator (11) that is connected with survey sensor, frequency generator output is joined with capacitance measurement translation circuit (12), temperature survey and compensating circuit (13) and capacitance measurement translation circuit (12) are connected in single-chip data acquisition treatment circuit (14), and single-chip data acquisition treatment circuit (14) is connected with display (15).
CNB2007100570113A 2007-03-27 2007-03-27 Measuring transducer for fuel permittivity of aeroplane fuel tank and measuring instrument Expired - Fee Related CN100478682C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2007100570113A CN100478682C (en) 2007-03-27 2007-03-27 Measuring transducer for fuel permittivity of aeroplane fuel tank and measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2007100570113A CN100478682C (en) 2007-03-27 2007-03-27 Measuring transducer for fuel permittivity of aeroplane fuel tank and measuring instrument

Publications (2)

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CN101034074A CN101034074A (en) 2007-09-12
CN100478682C true CN100478682C (en) 2009-04-15

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106644828A (en) * 2016-10-27 2017-05-10 北京润道油液监测技术有限公司 Test system for testing comprehensive information of oil sample and method of test system
CN108204847B (en) * 2017-12-27 2020-04-07 中国航发四川燃气涡轮研究院 Aero-engine lubricating oil liquid level and oil product integrated measurement sensor and method

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
电容式油水界面液位传感器的设计. 王毅等.中国仪器仪表,第5期. 2006
电容式油水界面液位传感器的设计. 王毅等.中国仪器仪表,第5期. 2006 *
电容式液位测量系统的设计. 招惠玲等.传感器技术,第23卷第3期. 2004
电容式液位测量系统的设计. 招惠玲等.传感器技术,第23卷第3期. 2004 *

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Granted publication date: 20090415

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