CN87209380U - Optical fibre sensitive tank gauge - Google Patents
Optical fibre sensitive tank gauge Download PDFInfo
- Publication number
- CN87209380U CN87209380U CN 87209380 CN87209380U CN87209380U CN 87209380 U CN87209380 U CN 87209380U CN 87209380 CN87209380 CN 87209380 CN 87209380 U CN87209380 U CN 87209380U CN 87209380 U CN87209380 U CN 87209380U
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- liquid level
- gauge
- liquid
- float housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Abstract
The utility model discloses an optical fiber sensitive tank gauge which is composed of a fiber optic sensing head, a serving mechanism, a photoelectric encoder and a microcomputer system. The optical fiber gauge head capable of sensing the subtle change of the liquid level, the photoelectric encoder which can precisely measure any length and the microcomputer make the measurement uncertainty of the tank gauge +/-(0.2+0.05l) mm. When the temperature, the density of the measured liquid and the loading table of the liquid preserving tank and other parameters are input, the microcomputer can compute the quality of the liquid in and out of the storage tank. The utility model is suitable for metering in the trade on petroleum and the petroleum products.
Description
The present invention relates to a kind of is the liquid level gauge of sensitive element with the optical fiber gauge head.Be applicable to the liquid level of the various fluid storage jars of accurate measurement, and the metering when being specially adapted to oil and goods trade thereof.
The fiber optic liquid height meter of introducing among the CN85202562U mainly by float, counting fluted disc, cable wire, weight, optical fiber to and corresponding photoelectric device, circuit form.When liquid level changed, the suffered buoyancy of the float of this liquid level gauge changed, thereby made float that corresponding motion take place.So cable wire drives the counting fluted disc and rotates.The fluted disc revolution moves a tooth, expression level change one unit height.The shortcoming of this liquid level gauge is that measuring accuracy is not high.The cable wire of this liquid level gauge in the power that the fixed point place from the high h of liquid level is subjected to is: F=mg+ (π)/4 d
2H ρ g-SH ρ g
In the formula: m---float quality, d---rope diameter.ρ
1---cable wire density, S---float sectional area, H---float immerses liquid depth, ρ---fluid density, g---acceleration of gravity.
As can be seen from the above equation, when liquid level was changed to 10 meters, diameter was 2 millimeters a cable wire, and its Gravity changer is about 2.4 newton, this need diameter be 400 millimeters garden shape float to immerse density be about 2.5 millimeters of 0.8 liquid, could produce the buoyancy of balance with it.In addition, the height value of counting fluted disc per tooth representative, the resistance that exists when it rotates all will further reduce the measuring accuracy of this method.
Task of the present invention is that a kind of high-precision liquid level gauge will be provided, and the uncertainty that its measures liquid level be ± (0.2+0.05l) millimeter, and l is a measuring height in the formula, and unit is meter.
Task of the present invention is finished as follows:
Fig. 1 is a schematic diagram.
Fig. 2 is the sectional view of a kind of concrete structure of optical fiber sensor head of the present invention.
The optical fiber sensor head (1) of an energy perception liquid level subtle change, liquid level variation is outputed to miniature computing system with electric signal, computer control stepping (or serving) motor (3) rotates, the rotation of motor is by worm screw (6), worm gear (5) drives coiling drum (4) and rotates, (4) rotation moves up and down optical fiber sensor head (1) by cable wire (2), and when the distance of optical fiber sensor head and liquid level reached setting again, computing machine stopped operating motor (3).When worm gear (5) drives coiling drum (4) rotation, also driving photoelectric encoder (7) by shaft coupling rotates, so distance that photoelectric encoder moves optical fiber sensor head, it is the changing value liquid level value of certain reference point (or with respect to) of liquid level, with binary code input computing machine, thereby realization is to the metering of liquid level, owing to adopted computing machine, can revise systematic errors such as temperature, thereby obtain accurate liquid level value.If when measuring liquid level,, then calculate the quality that function provides the liquid of turnover storage tank to the data such as loading table of temperature, density and the storage tank of computing machine input fluid to be measured.
Below optical fiber sensor head is described in detail.Catoptron (8) is fixed on the float housing (10).Two optical fiber gauge heads (15), (16) are fixed on the measuring head base (9), and measuring head base (9) has the annular boss a little more than the optical fiber gauge head end face, to prevent the optical fiber gauge head end catoptron workplace of damaging.Measuring head base is linked to the coiling drum (4) of Fig. 1 by cable wire (2).Play the diaphragm (13) of sealing and elasticity binding effect, be fixed in float housing (10) and measuring head base (9) by sealing trim ring (12), (14), diaphragm selects for use material stable in fluid to be measured to make.Be equipped with on the flange of trim ring (14) and adjust screw (17), the distance between optical fiber gauge head in the time of can adjusting the initialization state by (17) (15), (16) end face and catoptron (8) reflecting surface.This distance generally is not more than 2 millimeters, is good with 0.2 to 0.7 millimeter.Pouring weight (11) makes when liquid level descends, and the distance of catoptron and optical fiber gauge head (16) is greater than the distance of catoptron and optical fiber gauge head (15), otherwise when liquid level rises.Light source (18) is injected the incident optical of optical fiber gauge head (16), (15) with identical light intensity, incident optical projects catoptron (8) with light, reflected light is received by the outgoing optical fiber of (15), (16) respectively, and be sent to photovalve (19), (19) are two quadrant pipe or symmetrical beam battery.Owing to use two optical fiber gauge heads, and be control signal, so can eliminate the influence that light source, receiving element, amplifying circuit drift about effectively with likening to of two gauge head output signals.Optical fiber gauge head (15) with adjust screw (17) apart from l
1As far as possible little.Between two gauge heads apart from l
2Size influence the sensitivity of sensing head, as long as l
2Greater than l
1Can make the sensitivity of sensing head satisfy actual needs easily.
Claims (2)
1, a kind of by optical fiber sensor head, motor and gear train, photoelectric encoder, the Fibre Optical Sensor liquid level gauge that microcomputer system is formed, computer control motor (3) rotates, the rotation of motor (3) is by worm screw (6), worm gear (5) drives coiling drum (4) and rotates, by cable wire (2) optical fiber sensor head (1) is moved up and down again, it is characterized in that catoptron (8) is fixed on the float housing (10), two optical fiber gauge heads (15) of energy perceived reflection mirror position subtle change, (16) be fixed on the measuring head base (9), measuring head base (9) is linked by seal membrane (13) elasticity with float housing (10).
2, liquid level gauge according to claim 1 is characterized in that having on the float housing making the pouring weight that is fixed on the mirror tilt on the float housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87209380 CN87209380U (en) | 1987-06-21 | 1987-06-21 | Optical fibre sensitive tank gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87209380 CN87209380U (en) | 1987-06-21 | 1987-06-21 | Optical fibre sensitive tank gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87209380U true CN87209380U (en) | 1988-06-15 |
Family
ID=4824475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87209380 Ceased CN87209380U (en) | 1987-06-21 | 1987-06-21 | Optical fibre sensitive tank gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87209380U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034393A (en) * | 2013-10-16 | 2014-09-10 | 王琪伟 | Optical fiber liquid level dynamic monitor |
| CN109556680A (en) * | 2019-01-24 | 2019-04-02 | 北京均友欣业科技有限公司 | A kind of level measuring method and system |
-
1987
- 1987-06-21 CN CN 87209380 patent/CN87209380U/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034393A (en) * | 2013-10-16 | 2014-09-10 | 王琪伟 | Optical fiber liquid level dynamic monitor |
| CN109556680A (en) * | 2019-01-24 | 2019-04-02 | 北京均友欣业科技有限公司 | A kind of level measuring method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |