CN103134964B - Electrostatic fiber optic measuring apparatus and measuring method - Google Patents

Abstract

The invention provides a kind of electrostatic fiber optic measuring apparatus and measuring method, it comprises light emitting devices, plated film electrostatic verifying attachment, optical pickup apparatus, photoelectric conversion unit and single-chip microcomputer, plated film electrostatic verifying attachment is connected by electrostatic conductive leads the static content gathering measurand with measurand, plated film electrostatic verifying attachment receives opening angle θ after static content, the light that light emitting devices sends is beaten and is received by optical pickup apparatus after reflection on plated film electrostatic verifying attachment, then is converted to electrical signal transfer to single-chip microcomputer through photoelectric conversion unit.The principle of reflection of plated film electrostatic verifying attachment by electrostatic opening angle and light combines by the present invention cleverly, thus calculate the static content of measurand, the loss of reflecting in two processes by electrostatic opening angle and light due to plated film electrostatic verifying attachment is all very little, therefore fuel tank internal static content can be obtained accurately, and simple to operate.

Description

Electrostatic fiber optic measuring apparatus and measuring method

Technical field

The invention belongs to a kind of device indicating static content, be applied to and measure vehicle interior case inside because of fricative amount of electrostatic charge.

Background technology

Electrostatic fiber optic measuring apparatus is the technology that the amount of electrostatic charge produced because of friction vehicles fuel tank internal is measured, at present, the technology being applied to oil tank of vehicle static content is short of very much, this kind of technology is applied to the measurement of the fuel tank static content of aircraft more, the method that current measurement of electrostatic is comparatively traditional adopts the measuring method of insulation resistance R (electricalresistivityρ), Electro-static Driven Comb constant τ and half life period τ _halfmeasuring method, the measuring method of electrostatic potential V, the measuring method of electricity Q and electric density σ, reflection method, flow process is simple, is not but the measurement for comparatively special automotive oil tank internal electrostatic amount.

Summary of the invention

For solving the technology shortcoming of the static content of the fuel tank internal measuring the vehicles, the invention provides a kind of electrostatic fiber optic measuring apparatus and measuring method.

For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of electrostatic fiber optic measuring apparatus, it is characterized in that: it comprises light emitting devices, plated film electrostatic verifying attachment, optical pickup apparatus, photoelectric conversion unit and single-chip microcomputer, plated film electrostatic verifying attachment is connected by electrostatic conductive leads the static content gathering measurand with measurand, plated film electrostatic verifying attachment receives opening angle θ after static content, the light that light emitting devices sends is beaten and is received by optical pickup apparatus after reflection on plated film electrostatic verifying attachment, electrical signal transfer is converted to single-chip microcomputer again through photoelectric conversion unit.

By said apparatus, when the light that the position relationship between light emitting devices and plated film electrostatic verifying attachment makes light emitting devices send is beaten and reflected on plated film electrostatic verifying attachment, the incident angle of light and reflection angle are all equal with plated film electrostatic verifying attachment opening angle θ.

By said apparatus, described light emitting devices is laser beam emitting device, described optical pickup apparatus is fiber array, described photoelectric conversion unit is photodiode array, each photodiode respectively with the Fiber connection in a fiber array, in fiber array, the layout of optical fiber makes the optical fiber receiving light signal become corresponding relation with plated film electrostatic verifying attachment opening angle θ.

By said apparatus, described light emitting devices is incandescent lamp emitter; Described optical pickup apparatus comprises prism and fiber array, prism is arranged between fiber array and described plated film electrostatic verifying attachment and is received by the optical fiber that fiber array is corresponding for the light incandescence of reflection being reflected into different spectrum, and in fiber array, the layout of optical fiber makes to receive the optical fiber of light signal and becomes corresponding relation with the wavelength of light signal and plated film electrostatic verifying attachment opening angle θ; Described photoelectric conversion unit is fiber grating demodulation device.

By said apparatus, between described laser beam emitting device and plated film electrostatic verifying attachment, be also provided with cylindrical mirror.

A kind of electrostatic optical fibre measuring method, is characterized in that: it comprises the following steps:

Plated film electrostatic verifying attachment gathers the static content of measurand by electrostatic conductive leads, and plated film electrostatic verifying attachment receives opening angle θ after static content;

Light emitting devices sends after light to play on plated film electrostatic verifying attachment reflection and is received by optical pickup apparatus, then is converted to electrical signal transfer to single-chip microcomputer through photoelectric conversion unit;

Single-chip microcomputer calculates the static content of measurand according to the electric signal received.

As stated above, when the light that the position relationship between light reflecting device and plated film electrostatic verifying attachment makes light emitting devices send is beaten and reflected on plated film electrostatic verifying attachment, the incident angle of light and reflection angle are all equal with plated film electrostatic verifying attachment opening angle θ.

As stated above, described light emitting devices is laser beam emitting device, described optical pickup apparatus is fiber array, described photoelectric conversion unit is photodiode array, each photodiode respectively with the Fiber connection in a fiber array, in fiber array, the layout of optical fiber makes the optical fiber receiving light signal become corresponding relation with plated film electrostatic verifying attachment opening angle θ; The corresponding relation of photodiode and plated film electrostatic verifying attachment opening angle θ preset by single-chip microcomputer, determine the plated film electrostatic verifying attachment opening angle θ corresponding with the optical fiber that photodiode connects according to the photodiode receiving electric signal, the mapping relations set up between plated film electrostatic verifying attachment opening angle θ and static content Q obtain the static content Q of measurand.

As stated above, described light emitting devices is incandescent lamp emitter; Described optical pickup apparatus comprises prism and fiber array, prism is arranged between fiber array and described plated film electrostatic verifying attachment and is received by the optical fiber that fiber array is corresponding for the light incandescence of reflection being reflected into different spectrum, and in fiber array, the layout of optical fiber makes to receive the optical fiber of light signal and becomes corresponding relation with the wavelength of light signal and plated film electrostatic verifying attachment opening angle θ; Described photoelectric conversion unit is fiber grating demodulation device; The optical signal demodulation that optical fiber receives by fiber grating demodulation device is wavelength signals; The corresponding relation receiving the optical fiber of light and the wavelength coverage of light and plated film electrostatic verifying attachment opening angle θ preset by single-chip microcomputer, wavelength signals according to the optical fiber information and received light that receive light that receive from fiber grating demodulation device obtains θ, and the mapping relations set up between plated film electrostatic verifying attachment opening angle θ and static content Q obtain the static content Q of measurand.

As stated above, plated film electrostatic verifying attachment comprises a fixed pointers and a movable pointer, and fixed pointers is vertical direction, and movable pointer is a bit rotatably connected with in fixed pointers, and the point be rotatably connected is set to the point of rotation; Mapping relations between plated film electrostatic verifying attachment opening angle θ and static content Q are:

$Q=3\sin \mathrm{\θ}\sqrt{\frac{{\mathrm{mgl}}_{1}l\sin \mathrm{\θ}}{(1+\frac{1}{2}\sin \mathrm{\θ})(\cos \frac{\mathrm{\θ}}{2}-\sin \frac{\mathrm{\θ}}{2})}},$

Wherein, l ₁for movable pointer center of gravity offset distance is from the distance of the point of rotation, l is half length of movable pointer, and m is the quality of movable pointer, and g is acceleration of gravity.

As stated above, also cylindrical mirror is provided with between described laser beam emitting device and plated film electrostatic verifying attachment.

Beneficial effect of the present invention is:

1, the principle of reflection of plated film electrostatic verifying attachment by electrostatic opening angle and light combines by the present invention cleverly, thus calculate the static content of measurand, the loss of reflecting in two processes by electrostatic opening angle and light due to plated film electrostatic verifying attachment is all very little, therefore fuel tank internal static content can be obtained accurately, and simple to operate.

2, the light sent due to light emitting devices has difference, the present invention each provides corresponding solution, if light source is the light of single wavelength, then determine plated film electrostatic verifying attachment opening angle θ according to the reflection angle of light, if light source is incandescence, then determine plated film electrostatic verifying attachment opening angle θ according to the reflection angle of spectrum and light.

3, for ease of calculating, when the light that position relationship between light emitting devices and plated film electrostatic verifying attachment makes light emitting devices send is beaten and reflected on plated film electrostatic verifying attachment, the incident angle of light and reflection angle are all equal with plated film electrostatic verifying attachment opening angle θ.

4, in order to make laser better beat on plated film electrostatic verifying attachment, between laser beam emitting device and plated film electrostatic verifying attachment, selectablely cylindrical mirror can also be provided with.

Accompanying drawing explanation

Fig. 1 is the structural representation of the embodiment of the present invention one.

Fig. 2 is the structural representation of the embodiment of the present invention two.

Fig. 3 is the structural representation of plated film electrostatic verifying attachment.

Fig. 4 is the method flow diagram of the embodiment of the present invention one.

Fig. 5 is the method flow diagram of the embodiment of the present invention two.

In figure: 1. fixed pointers, 1-1. the point of rotation, 1-2. fixed pointers lower end, 2. movable pointer, 2-1. movable pointer focus point, 2-2. movable pointer lower end, 2-3. movable pointer upper end, 3. metal shell, 4. insulator foot, 11. laser beam emitting devices, 12. plated film electrostatic verifying attachments, 13. electrostatic conductive leads, 14. measuring objects, 15. fiber arrays, 16. photodiode arrays, 17. single-chip microcomputers, 21. incandescent lamp emitters, 22. plated film electrostatic verifying attachments, 23. electrostatic conductive leads, 24. measuring objects, 25. fiber arrays, 26. fiber grating demodulation devices, 27. single-chip microcomputers, 28. prisms.

Embodiment

Below in conjunction with specific embodiments and the drawings, the present invention will be further described.

Electrostatic fiber optic measuring apparatus provided by the invention comprises light emitting devices, plated film electrostatic verifying attachment, optical pickup apparatus, photoelectric conversion unit and single-chip microcomputer, plated film electrostatic verifying attachment is connected by electrostatic conductive leads the static content gathering measurand with measurand, electrically mutually repel due to of the same name, plated film electrostatic verifying attachment receives opening angle θ after static content, the light that light emitting devices sends is beaten and is received by optical pickup apparatus after reflection on plated film electrostatic verifying attachment, then is converted to electrical signal transfer to single-chip microcomputer through photoelectric conversion unit.

Electrostatic optical fibre measuring method provided by the invention comprises the following steps: plated film electrostatic verifying attachment gathers the static content of measurand by electrostatic conductive leads, and plated film electrostatic verifying attachment receives opening angle θ after static content; Light emitting devices sends after light to play on plated film electrostatic verifying attachment reflection and is received by optical pickup apparatus, then is converted to electrical signal transfer to single-chip microcomputer through photoelectric conversion unit; Single-chip microcomputer calculates the static content of measurand according to the electric signal received.

Embodiment one:

Fig. 1 is the structural representation of the embodiment of the present invention one, in the present embodiment, light emitting devices is laser beam emitting device 11, optical pickup apparatus is fiber array 15, described photoelectric conversion unit is photodiode array 16, each photodiode respectively with the Fiber connection in a fiber array, in fiber array, the layout of optical fiber makes the optical fiber receiving light signal become corresponding relation with plated film electrostatic verifying attachment 12 opening angle θ.When the light that position relationship between laser beam emitting device 11 and plated film electrostatic verifying attachment 12 makes laser beam emitting device 11 send is beaten and reflected on plated film electrostatic verifying attachment 12, the incident angle of light and reflection angle are all equal with plated film electrostatic verifying attachment 12 opening angle θ.

Fig. 4 is the method flow diagram of the embodiment of the present invention one, plated film electrostatic verifying attachment 12 gathers the static content of measurand 14 by electrostatic conductive leads 13, plated film electrostatic verifying attachment 12 receives opening angle θ after static content, the laser that laser beam emitting device 11 sends is beaten and is received by fiber array 15 after reflection on plated film electrostatic verifying attachment 12, electrical signal transfer is converted to single-chip microcomputer 17 again through photodiode array 16, the corresponding relation of photodiode and plated film electrostatic verifying attachment opening angle θ preset by single-chip microcomputer 17, the plated film electrostatic verifying attachment opening angle θ corresponding with the optical fiber that photodiode connects is determined according to the photodiode receiving electric signal, the mapping relations set up between plated film electrostatic verifying attachment opening angle θ and static content Q obtain the static content Q of measurand.

In the present embodiment, light signal is converted into digital pulse signal by photodiode, and this digital pulse signal passes to single-chip microcomputer becomes binary code, and the corresponding relation of binary code and plated film electrostatic verifying attachment opening angle θ preset by single-chip microcomputer.

As shown in Figure 3, comprise shell 3, insulator foot 4, fixed pointers 1 and a movable pointer 2, fixed pointers 1 is vertical direction to plated film electrostatic verifying attachment, and movable pointer 2 is a bit rotatably connected with in fixed pointers 1, and the point be rotatably connected is set to point of rotation 1-1.If the focus point of movable pointer 2 is 2-1, in the present embodiment, movable pointer is uniform metal finger, and therefore focus point is movable pointer mid point.

When movable pointer upper end 2-3, movable pointer lower end 2-2 and fixed pointers lower end 1-2 every termination carried charge are respectively q, when movable pointer drift angle is θ, the electrostatic repulsion square M of the Coulomb law formula provided by system of units and statical moment formula known fixed pointers lower end 1-2 point charge and movable pointer lower end 2-2 point charge ₁for:

$M_1{=q}^2\cos \left(\frac{\mathrm{\θ}}{2}\right)/\left(4\mathrm{lsi}{n}^2\left(\frac{\mathrm{\θ}}{2}\right)\right),$

The electrostatic repulsion square M of fixed pointers lower end 2-2 point charge and movable pointer upper end 2-3 point charge ₂for:

$M_2{=q}^2\cos \left(\frac{\mathrm{\θ}}{2}\right)/\left(4l{\cos }^2\left(\frac{\mathrm{\θ}}{2}\right)\right),$

Gravitational torque M suffered by movable pointer ₃for:

M ₃＝mgl ₁sinθ

Can be obtained by moment equilibrium condition:

M ₁-M ₂＝M ₃，

Push away $q=\sin \mathrm{\θ}\sqrt{\frac{{\mathrm{mgl}}_{1}l\sin \mathrm{\θ}}{(1+\frac{1}{2}\sin \mathrm{\θ})(\cos \frac{\mathrm{\θ}}{2}-\sin \frac{\mathrm{\θ}}{2})}},$

Due on three terminations with electrostatic equal, show that total fuel tank electrostatic is Q=3q.

Wherein, l ₁for movable pointer center of gravity offset distance is from the distance of the point of rotation, l is half length of movable pointer, and m is the quality of movable pointer.Can be good at laser reflection being out fiber absorption in order to pointer, movable pointer is plated film pointer.

In order to make laser better beat on plated film electrostatic verifying attachment, between laser beam emitting device 11 and plated film electrostatic verifying attachment 12, selectablely cylindrical mirror can also be provided with.

Embodiment two:

The principle of the present embodiment is substantially identical with embodiment one with structure, and its difference is: as shown in Figure 2, and light emitting devices is incandescent lamp emitter 21; Optical pickup apparatus comprises prism 28 and fiber array 25, prism 28 is arranged between fiber array 25 and plated film electrostatic verifying attachment 22 and is received by optical fiber corresponding in fiber array 25 for the light incandescence of reflection being reflected into different spectrum, and in fiber array, the layout of optical fiber makes to receive the optical fiber of light signal and becomes corresponding relation with the wavelength of light signal and plated film electrostatic verifying attachment opening angle θ; Described photoelectric conversion unit is fiber grating demodulation device 26.

As shown in Figure 5, in the present embodiment, electrostatic optical fibre measuring method comprises the following steps: plated film electrostatic verifying attachment 22 gathers the static content of measurand 24 by electrostatic conductive leads 23, and plated film electrostatic verifying attachment 22 receives opening angle θ after static content; Incandescent lamp emitter 21 send reflect into different wave length by prism 28 after light to play on plated film electrostatic verifying attachment 22 reflection spectrum by fiber array 25 in corresponding optical fiber receive, in fiber array 25, the layout of optical fiber makes to receive the optical fiber of light signal and becomes corresponding relation with the wavelength of light signal and plated film electrostatic verifying attachment 22 opening angle θ; The optical signal demodulation that optical fiber receives is wavelength signals by fiber grating demodulation device 26; The corresponding relation receiving the optical fiber of light and the wavelength coverage of light and plated film electrostatic verifying attachment opening angle θ preset by single-chip microcomputer 27, wavelength signals according to the optical fiber information and received light that receive light that receive from fiber grating demodulation device 26 obtains θ, and the mapping relations set up between plated film electrostatic verifying attachment opening angle θ and static content Q obtain the static content Q of measurand.

In fiber array 25, the quantity of optical fiber can be determined by the maximum angle of anaclasis and minimum angles, and the angle of opening due to plated film electrostatic verifying attachment is different, and the point reflecting spectrum is different, draws the relation between optical fiber and corresponding spectrum according to theoretical and test.

Claims (2)

1. an electrostatic optical fibre measuring method, is characterized in that: it comprises the following steps:

Plated film electrostatic verifying attachment gathers the static content of measurand by electrostatic conductive leads, and plated film electrostatic verifying attachment receives opening angle θ after static content;

Light emitting devices sends after light to play on plated film electrostatic verifying attachment reflection and is received by optical pickup apparatus, then is converted to electrical signal transfer to single-chip microcomputer through photoelectric conversion unit;

Single-chip microcomputer calculates the static content of measurand according to the electric signal received;

When the light that position relationship between light reflecting device and plated film electrostatic verifying attachment makes light emitting devices send is beaten and reflected on plated film electrostatic verifying attachment, the incident angle of light and reflection angle are all equal with plated film electrostatic verifying attachment opening angle θ;

Described light emitting devices is incandescent lamp emitter; Described optical pickup apparatus comprises prism and fiber array, prism is arranged between fiber array and described plated film electrostatic verifying attachment and is received by the optical fiber that fiber array is corresponding for the light incandescence of reflection being reflected into different spectrum, and in fiber array, the layout of optical fiber makes to receive the optical fiber of light signal and becomes corresponding relation with the wavelength of light signal and plated film electrostatic verifying attachment opening angle θ; Described photoelectric conversion unit is fiber grating demodulation device; The optical signal demodulation that optical fiber receives by fiber grating demodulation device is wavelength signals; The corresponding relation receiving the optical fiber of light and the wavelength coverage of light and plated film electrostatic verifying attachment opening angle θ preset by single-chip microcomputer, wavelength signals according to the optical fiber information and received light that receive light that receive from fiber grating demodulation device obtains θ, and the mapping relations set up between plated film electrostatic verifying attachment opening angle θ and static content Q obtain the static content Q of measurand.

2. electrostatic optical fibre measuring method according to claim 1, it is characterized in that: plated film electrostatic verifying attachment comprises a fixed pointers and a movable pointer, fixed pointers is vertical direction, and movable pointer is a bit rotatably connected with in fixed pointers, and the point be rotatably connected is set to the point of rotation; Mapping relations between plated film electrostatic verifying attachment opening angle θ and static content Q are:

$Q=3\sin \mathrm{\θ}\sqrt{\frac{{\mathrm{mgl}}_{1}l\sin \mathrm{\θ}}{(1+\frac{1}{2}\sin \mathrm{\θ})(\cos \frac{\mathrm{\θ}}{2}-\sin \frac{\mathrm{\θ}}{2})}},$

Wherein, l ₁for movable pointer center of gravity offset distance is from the distance of the point of rotation, l is half length of movable pointer, and m is the quality of movable pointer, and g is acceleration of gravity.