CN1301961A

CN1301961A - Gasoline grade detector with composite sensor

Info

Publication number: CN1301961A
Application number: CN 99127327
Authority: CN
Inventors: 崔大付; 赵湛; 李亚亭
Original assignee: Institute of Electronics of CAS
Current assignee: Institute of Electronics of CAS
Priority date: 1999-12-29
Filing date: 1999-12-29
Publication date: 2001-07-04

Abstract

The gasoline grade detector consists of two parts, hardware and software, and the hardware consists of capacitor sensor, temperature sensor, front-stage signal treating circuit, monochip computer and display. The relative dielectric constant and temperature of gasoline detected by the sensors are processed in the front stage signal treating circuit and monochip computer and the grade valve is displayed directly after the message fusion treatment of the software. The gasoline grade detector with composite sensor provides a fast, cheap and efficient measure for judging the quality of gasoline.

Description

Gasoline grade detector with composite sensor

The invention belongs to the uprising index-octane value of gasoline, be commonly called as the sampling test instrumentation of gasoline label.At present, in petroleum chemical enterprise, the method for measuring octane value is the relative looser organon with condition of motor method (MON) (RON).This be a kind of " ancient " also be the most direct method.Still is using as standard detecting method countries in the world at present.Some new methods are also arranged in research simultaneously, such as using infra-red sepectrometry, physicochemical analysis means such as chromatography are carried out the mensuration of octane value.The equipment price costliness that these method characteristics are to use, bulky, during check fee, effort, expensive.

The objective of the invention is to overcome the deficiency of existing measuring technology, utilize the composite sensing technology to detect, accomplish to improve greatly the efficient of detection, realize quick, cheap detection.

The object of the present invention is achieved like this:

1. gasoline label is relevant with the complex dielectric constant of its component, and specific inductive capacity is relevant with temperature again simultaneously.Therefore method for measuring is characterised in that:

(a) funtcional relationship of physical quantity such as gasoline label Y and DIELECTRIC CONSTANT r and temperature T is:

Y=F (ε r, T)=w ₁ ^*T+w ₂ ^*F (ε r)+b is w wherein ₁, w ₂Be weight, b is for revising side-play amount, and f (ε r) is a frequency values.According to (a) described method, the sensor construction of test is characterized in that:

(b) insulation framework (4), its underpart can be assembled the electrode (1) of many group annulars, and (3) are added a cover on its top, and gap (2) are the capacitance-frequency translation circuit in the middle of it, and its center is embedded with thermistor temperature sensor (5).

(c) tester is characterised in that: by the relative dielectric constant of capacitive transducer test gasoline, connect signal conversion circuit and be transformed to frequency values f (ε r), directly send into the counting interface of single-chip microcomputer.Test out the temperature value T of gasoline by temperature sensor,, send into single-chip microcomputer, instrument is carried out 2 demarcation, obtain w by Calibration Circuit through the A/D conversion ₁, w ₂With the b value, relevant data is stored on the display that test result is presented at single-chip microcomputer links to each other among the EEPROM.Each circuit part also links to each other with reference power circuit with feed circuit.

Gasoline grade detector with composite sensor, sensor is characterised in that: the outer electrode of organizing ring electrode is a screening electrode more, circuit and sensor that capacitance is transformed to frequency are one.

The structure of the sensor of gasoline grade detector with composite sensor is characterized in that: separate with sensor test instrumentation data processing and display part, uses shielded conductor to link to each other, and distance can be greater than 10 meters; The sensor mask utmost point links to each other with the connecting line screening electrode, in the instrument partial earth.

Device of the present invention is as follows:

Gasoline grade detector with composite sensor comprises the compound sensor probe, and the compound sensor sonde configuration as shown in Figure 1.Instrument housing has LCD or LED display window on the shell, circuit board is arranged in the shell, and the plectrum switch is arranged on the plate, and the input circuit of adjustable resistance analog gasoline index value is arranged; The compound sensor probe is connected with the shielded cable of length greater than 10 meters with instrument.Sensor probe is assembled on the skeleton (4) of insulation by the metallic cylinder of various outer diameter, and (3) are added a cover on its top, and gap (1) is the capacitance-frequency translation circuit in the middle of it, is embedded with thermistor temperature sensor (5) at the center of skeleton.

Tester of the present invention has following characteristics:

1. after the gasoline by two known labels is demarcated, under different environment temperatures, test out temperature T and frequency f, (ε r T) can test out the label of gasoline, and directly is presented on the instrument with numeral by formula Y=F.

2. the present invention is a kind of instrument of quick, succinct test gasoline label.

3. measurement circuit of the present invention is simple, and the compound sensor probe can be by the mould manufacturing, and with low cost, signal Processing is by Single-chip Controlling; Opening power realized intellectuality, as long as just can be tested; Whole instrument cost is very low, can receive for general consumer.

Description of drawings:

Fig. 1, compound sensor structural representation.1-organizes ring electrode more, 2-capacitance-frequency conversion circuit, 3-lid, 4-insulation framework, 5-temperature sensor;

Fig. 2, gasoline grade detector with composite sensor hardware block diagram;

Fig. 3, sensor equivalent electrical circuit;

Fig. 4, gasoline grade detector with composite sensor are implemented schematic circuit;

Fig. 5, main program flow chart.

Embodiment

Gasoline grade detector with composite sensor of the present invention is made up of two parts: sensor probe and instrument.Probe physical dimension is Φ 25 * 35mm, transducing part is Φ 25 * 15mm, and for the 15mm wall thickness is five different stainless-steel tube nested compositions of 0.5 diameter, outermost steel pipe is a screen layer by long, all the other four constitute a capacitive transducer, and the equivalent electrical circuit of connection as shown in Figure 2.

Practical structures steel pipe of the present invention is to be bonded on the nylon base that is carved with annular pickup groove, and the capacitance of formation is at 20～30P.Front stage circuits is made up of phaselocked loop 4046, and the capacitance Direct Transform is a frequency values, and frequency range is between 500kHz～1MHz.Temperature sensor is the NTC thermistor, and front stage circuits has LM258 to constitute.Instrumented data is handled and is selected the PIC16C73 single-chip microcomputer of low-power consumption for use, and LCM7211 is as liquid crystal display circuit, and X25043 is a data-carrier store.Schematic block circuit diagram as shown in Figure 3.Realize circuit as shown in Figure 4.Software flow as shown in Figure 5.

Claims

1. a gasoline label is relevant with the complex dielectric constant of its component, and relevant with the temperature again gasoline grade detector with composite sensor of while specific inductive capacity is characterized in that:

(a) assay method: the funtcional relationship of physical quantitys such as gasoline label Y and DIELECTRIC CONSTANT r and temperature T is:

Y=F (ε r, T)=w ₁ ^*T+w ₂ ^*F (ε r)+b is w wherein ₁, w ₂Be weight, b is for revising side-play amount, and f (ε r) is a frequency values;

(b) Ce Shi sensor construction: insulation framework (4), its underpart can be assembled the electrode (1) of many group annulars, and (3) are added a cover on its top, and gap (2) are the capacitance-frequency translation circuit in the middle of it, and its center is embedded with thermistor temperature sensor (5);

(c) circuit of tester: the capacitive transducer by the relative dielectric constant of testing gasoline connects the signal conversion circuit that is transformed to frequency values f (ε r), connects the counting interface of single-chip microcomputer again; Temperature sensor connects single-chip microcomputer through the A/D conversion, and single-chip microcomputer connects control circuit and the data-carrier store and the switch of display screen, and each circuit also is connected with reference power circuit with feed circuit.

2. gasoline grade detector with composite sensor according to claim 1 is characterized in that: the outer electrode of many groups ring electrode of sensor is a screening electrode, and circuit and sensor that capacitance is transformed to frequency are one.

3. gasoline grade detector with composite sensor according to claim 2 is characterized in that: separate with sensor test instrumentation data processing and display part, uses shielded conductor to link to each other, and distance can be greater than 10 meters; The sensor mask utmost point links to each other with the connecting line screening electrode, in the instrument partial earth.