CN103759712B - A kind of digital level sensor - Google Patents
A kind of digital level sensor Download PDFInfo
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- CN103759712B CN103759712B CN201410026868.9A CN201410026868A CN103759712B CN 103759712 B CN103759712 B CN 103759712B CN 201410026868 A CN201410026868 A CN 201410026868A CN 103759712 B CN103759712 B CN 103759712B
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- pendulum
- push rod
- inditron
- ccd
- microprocessor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C9/00—Measuring inclination, e.g. by clinometers, by levels
- G01C9/12—Measuring inclination, e.g. by clinometers, by levels by using a single pendulum plumb lines G01C15/10
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- General Physics & Mathematics (AREA)
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of digital level sensor, comprise shell, be provided with Circuits System in shell, hang pendulum parts, fluid pressure type micrometric displacement amplifier unit and source of parallel light, the described structure hanging pendulum parts is: comprise pendulum, T-shaped push rod, pendulum rotating shaft, pendulum is flexibly connected with pendulum rotating shaft by T-shaped push rod.This sensor has following characteristics: output be digital signal, each induction unit outputs signal with the form of switching pulse, sampled data only has " 0 " and " 1 ", overcome traditional analog quantity detection mode itself with fuzzy composition, avoid the impact by multiple environment distribution parameters such as temperature, atmospheric pressure, electric field, magnetic fields, greatly increase the accuracy of detection, reliability, and resolution and precision very high, structure is simple, and cost is low.
Description
Technical field
The present invention relates to a kind of digital level sensor.
Background technology
At present, when engineering equipment horizontality is measured, with more be that (it is by the skew of bubble phase to groove to bubble and scale, measured object whether level is judged) with eyes, its shortcoming is that sensitivity is limited, and can not electric signal be produced, be not easy to automatically measure and automatically control, and in more existing horizon sensors, mostly be carry out the conversion of physical quantity (as electrolytic in the mode of analog quantity conversion, condenser type etc.), its output is analog quantity, the change of the sampled signal amount of only having does not have the change (sudden change) of matter, be difficult to resist outside interference, inner drift, stability and reliability are difficult to meet request for utilization.And the sensor of digital sampling can obtain the improvement of essence in reliability, stability, so the research of digitizing physical quantity switching mechanism has become a main direction in sensor research field.
Summary of the invention
For above-mentioned prior art, the invention provides a kind of digital level sensor, this sensor has following characteristics: output be digital signal, each induction unit outputs signal with the form of switching pulse, sampled data only has " 0 " and " 1 ", overcome traditional analog quantity detection mode itself with fuzzy composition, avoid the impact by multiple environment distribution parameters such as temperature, atmospheric pressure, electric field, magnetic fields, greatly increase the accuracy of detection, reliability, and resolution and precision very high, structure is simple, and cost is low.
The present invention is achieved by the following technical solutions:
A kind of digital level sensor, comprises shell, is provided with Circuits System, hangs pendulum parts, fluid pressure type micrometric displacement amplifier unit 4 and source of parallel light in shell, wherein,
The structure of described Circuits System is: comprise microprocessor 31, CCD driving circuit 32, LED drive circuit 34, signal processing circuit 33 and line array CCD 26, and wherein, microprocessor 31 is connected with the LED array 28 of source of parallel light by LED drive circuit 34; Microprocessor 31 is connected 26 by CCD driving circuit 32 with line array CCD; Microprocessor 31 is connected with signal processing circuit 33, and signal processing circuit 33 is connected with line array CCD 26;
The described structure hanging pendulum parts is: comprise pendulum 7, T-shaped push rod 6, pendulum rotating shaft 5, pendulum 7 is flexibly connected with pendulum rotating shaft 5 by T-shaped push rod 6;
Described fluid pressure type micrometric displacement amplifier unit 4 has two, its structure is: the inditron 16 comprising liquid storage pipe 18 and be made up of transparent material, wherein, liquid storage pipe 18 is fastened by upper shell 17 and lower house 20 and is formed, diaphragm 19(preferred rubber diaphragm is provided with) in liquid storage pipe 18, circular push pedal 22 is provided with below diaphragm 19, push pedal 22 bottom is connected with push rod 24, correspondingly, lower house 20 is provided with pilot hole 23, push rod 24 is through pilot hole 23, push rod 24 end and T-shaped push rod 6 close contact (push rod 24 of a fluid pressure type micrometric displacement amplifier unit 4 and one end close contact of T-shaped push rod 6, the push rod 24 of another fluid pressure type micrometric displacement amplifier unit 4 and the other end close contact of T-shaped push rod 6), inditron 16 is positioned at above liquid storage pipe 18, and is communicated with liquid storage pipe 18 through upper shell 17, source of parallel light is arranged on inditron 16 side, and correspondingly, inditron 16 opposite side is provided with line array CCD 26, and the light that source of parallel light sends is irradiated on line array CCD 26 through after inditron 16, during use, in liquid storage pipe, fill opaque liquid,
The structure of described source of parallel light is: comprise LED array 28, frosted glass 29 and cylinder lenses 25 that ecto-entad is arranged in order.The principle of work of source of parallel light is common practise, for: after LED luminescence, light focuses on formation focal line (focal line is axially parallel with cylinder lenses) by frosted glass through cylinder lenses, obtains source of parallel light.Also the cylinder lenses 25 for focusing on is provided with between line array CCD 26 and inditron 16.
Further, described shell is made up of housing 8, the upper cover plate 1 being positioned at housing 8 top and the front shroud 11 that is positioned at housing 8 front portion, housing 8, surrounds a relatively airtight space between upper cover plate 1 and front shroud 11; Be provided with two limited blocks 9 bottom housing 8, pendulum 7 is between two limited blocks 9, and the effect of limited block is: restriction pendulum hunting range.
Further, connected by screw 15 between upper shell 17 and lower house 20.
The principle of work of a kind of digital level sensor of the present invention is: under gravity, pendulum 7 always tries hard to keep plummet direction, when shell tilts with measured object, opposite shell is swung an angle (pitch angle Δ Q) by pendulum 7, thus drive T-shaped push rod 6 to rotate same angle, and promote push rod 24 and produce corresponding Wei Yi ⊿ L
1, by Jian Ce ⊿ L
1just can obtain the pitch angle Δ Q(tan Δ Q=⊿ L of shell
1/ h, its principle is known mathematical general knowledge, does not repeat them here).⊿ L
1detection limit process is: when push rod 24 produces displacement, and the diaphragm 19 in corresponding liquid storage pipe 18 also produces identical Wei Yi ⊿ L
1, and then make liquid length in inditron 16 produce corresponding change, variable quantity is ⊿ L
2， Qie ⊿ L
2=(D/a)
2⊿ L
1.
The derivation of equation is as follows: because liquid is incompressible, have S
d⊿ L
1=S
a⊿ L
2
Wherein S
d=л (D/2)
2s
a=л (a/2)
2
Therefore have л (D/2)
2⊿ L
1=л (a/2)
2⊿ L
2
Arrange get ⊿ L
2=(D/a)
2⊿ L
1
Wherein, D is liquid storage pipe diameter, a be inditron diameter as shown in Figure 9.
By Ce Liang ⊿ L
2with regard to Ke get Dao ⊿ L
1， ⊿ L
2measuring process be, the light signal that source of parallel light sends, can do not passed in the past by the part optical signals that the liquid (liquid is opaque liquid) in transparent inditron 16 blocks, the picture dot of line array CCD 26 can receive light signal, export as digital signal " 1 " (after signal processing circuit process), and just passed not pass by by the part optical signals that the liquid in transparent inditron 16 blocks, the picture dot of line array CCD 26 does not receive light signal, exports as digital signal " 0 ".Microprocessor 31 must arrive ⊿ L according to predetermined algorithm to digital signal processing
2(when measured object tilts, in two inditrons, liquid level occurs differential, accepts the picture dot number of light signal not equal in two CCD, and microprocessor carrys out Que Ding ⊿ L by calculating its difference
2, its principle is proven technique in prior art, does not repeat them here), and then get Dao ⊿ L
1, and according to tan Δ Q=⊿ L
1/ h obtains pitch angle Δ Q, determines levelness finally by Δ Q.(note: ⊿ L
2=(N
2-N
1) d/2 wherein, N
1, N
2be respectively the picture dot number by illumination in two CCD, d is inter-pixel distance).
Fluid pressure type micrometric displacement amplifier unit has been that the effect of pre-converter (experiences Bei Ce Liang ⊿ L
1and be transformed to and Bei Ce Liang ⊿ L by CCD
1have the electricity determining relation), also play simultaneously and propose high-resolution effect and (such as get (D/a)
2=100, be then equivalent to Ba ⊿ L
1amplify 100 times, wherein ， ⊿ L
2=(D/a)
2⊿ L
1, D is liquid storage pipe diameter, and a is inditron diameter, as shown in Figure 9, when getting the inter-pixel of CCD apart from when being 0.01mm, Ze Dui ⊿ L
1resolution become from 0.01mm, 0.01mm/100=0.0001mm).
The effect of two (two) the hydraulic pressure micrometric displacement amplifier unit of employing is:
1) initial point (angle of inclination is the point of zero) is determined, when the liquid level in two inditrons is identical, (situation that the picture dot of two CCD accepts light signal is identical, namely light picture dot number is identical), definition pitch angle is zero (liquid level when only having run-off the straight in two inditrons just occurs differential, and namely one raises another reduction).
2) vergence direction (definition pitch angle is as just when the liquid level in the inditron of the left side raises, otherwise is negative) is judged.
3) impact of temperature is reduced, when the liquid length in inditron changes because of temperature variation, because of change direction identical (raise or reduce) simultaneously and size is the same, therefore cancel out each other (the shadow noon reducing temperature is very important concerning improving the precision of instrument, sensitivity and stability).
4) automatic zero set (AZS) (as long as the liquid level in two inditrons is the same be just decided to be zero point) is realized.
Liquid storage pipe in fluid pressure type micrometric displacement amplifier unit of the present invention is equivalent to the cylinder barrel in hydraulic cylinder, diaphragm is equivalent to the piston (diaphragm elastomeric material is made) in hydraulic cylinder, adopting diaphragm to make piston not only seals reliably, also there will not be the stuck problem as stiff piston, thus ensure that the reliability of measurement.Fluid pressure type micrometric displacement amount amplifier unit can also play damping action, therefore need not arrange special damping mechanism again.This member principle is succinct, simple and compact for structure, and there is not mechanical wear problem.(note: because rubber diaphragm is very thin, add up stroke very short, ⊿ L
1< 0.8mm, so circular push pedal, there will not be the phenomenon of mutually extruding between rubber diaphragm and liquid storage pipe)
Described microprocessor, signal processing circuit, LED driving circuit and CCD driving circuit, how its working method, principle of work be (as sent signal, how Received signal strength, process signal) be proven technique in prior art, do not repeat them here.
The structure of described source of parallel light, principle of work are proven technique in prior art, do not repeat them here.
Digital level sensor of the present invention, compared with traditional horizon sensor, has the following advantages:
1) exporting is digital signal, each induction unit (picture dot) outputs signal (each picture dot only has whether receive light signal two states) with the form of switching pulse, sampled data only has " 0 " and " 1 ", overcome traditional analog quantity detection mode itself with fuzzy composition, avoid by temperature, atmospheric pressure, electric field, the impact of the multiple environment distribution parameter such as magnetic field, greatly increase the accuracy of detection, reliability, do not need special A/D change-over circuit, A/D device can be avoided like this on the impact of precision (because A/D device limited precision, virtually data precision can reduced), be conducive to reducing Measuring Time, also the long-distance transmissions of signal is beneficial to.
2) resolution is very high, because fluid pressure type micrometric displacement amplifier unit is easy to realize very large enlargement factor (as long as change the value of D and a, and D with a becomes quadratic relationship), add that the inter-pixel of CCD is apart from very little (being generally about 0.01mm), so be easy to obtain high resolving power.Such as get (D/a)
2=100, inter-pixel distance is 0.01mm, Ze Dui ⊿ L
1resolution be 0.0001mm(0.01mm/100=0.0001mm), when getting h=50mm, then scale division value is 0.002mm/m(0.0001mm*20/50mm*20=0.002mm/m), resolution is about 0.4 rad.
3) fluid pressure type micrometric displacement amplifier unit is to displacement (⊿ L
1) amplification can not arrive impact by electromagnetic field, therefore make the antijamming capability of sensor be further enhanced (therefore transducer sensitivity can do very high).
4) CCD is discrete type element, therefore there is not nonlinear problem, and within whole range, the linearity is consistent.
5) impact of temperature can be reduced widely, because when the liquid length in inditron changes because of temperature variation, due to change direction identical (raise or reduce) simultaneously and size is the same, therefore can cancel out each other (the shadow noon reducing temperature is very important concerning improving the precision of instrument, sensitivity and stability).
6) stable performance, can not need calibration by Long-Time Service.
In addition, the present invention also has that structure is simple, easy to manufacture, low cost and other advantages.
Accompanying drawing explanation
Fig. 1 is the structural representation of digital level sensor of the present invention.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the structural representation of the fluid pressure type micrometric displacement amplifier unit of digital level sensor of the present invention.
Fig. 4 is A-A line cut-open view in Fig. 3.
Fig. 5 is the fixed seat structure schematic diagram of digital level sensor of the present invention.
Fig. 6 is B-B line cut-open view in Fig. 5.
Fig. 7 is the circuit theory schematic diagram of digital level sensor of the present invention.
Fig. 8 is the assembling schematic diagram of fluid pressure type micrometric displacement amplifier unit and holder.
Fig. 9 is the calculating schematic diagram of digital level sensor of the present invention.
Wherein, 1, upper cover plate; 2, circuit board; 3, L-type bracket; 4, fluid pressure type micrometric displacement amplifier unit; 5, pendulum rotating shaft; 6, T-shaped push rod; 7, pendulum; 8, housing; 9, limited block; 10, go between; 11, front shroud; 12, holder; 13, holder bracket; 14, pendulum rotary shaft base; 15, screw; 16, inditron; 17, upper shell; 18, liquid storage pipe; 19, diaphragm; 20, lower house; 21, fixed screw holes; 22, circular push pedal; 23, pilot hole; 24, push rod; 25, cylinder lenses; 26, line array CCD; 27, LED array fixed head; 28, LED array; 29, frosted glass; 30, data line; 31, microprocessor; 32, CCD driving circuit; 33, signal processing circuit; 34, LED drive circuit.
Note: measurement range ± 1 °.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
A kind of digital level sensor, comprises shell, is provided with Circuits System, hangs pendulum parts, fluid pressure type micrometric displacement amplifier unit 4 and source of parallel light in shell, as shown in Fig. 1 ~ Fig. 9, wherein,
The structure of described Circuits System is: comprise microprocessor 31, CCD driving circuit 32, LED drive circuit 34, signal processing circuit 33 and line array CCD 26, and wherein, microprocessor 31 is connected with the LED array 28 of source of parallel light by LED drive circuit 34; Microprocessor 31 is connected 26 by CCD driving circuit 32 with line array CCD; Microprocessor 31 is connected with signal processing circuit 33, and signal processing circuit 33 is connected with line array CCD 26;
The described structure hanging pendulum parts is: comprise pendulum 7, T-shaped push rod 6, pendulum rotating shaft 5, pendulum 7 is flexibly connected with pendulum rotating shaft 5 by T-shaped push rod 6;
Described fluid pressure type micrometric displacement amplifier unit 4 has two, its structure is: the inditron 16 comprising liquid storage pipe 18 and be made up of transparent material, wherein, liquid storage pipe 18 is fastened by upper shell 17 and lower house 20 and is formed, being provided with diaphragm 19(in liquid storage pipe 18 is rubber diaphragm), circular push pedal 22 is provided with below diaphragm 19, push pedal 22 bottom is connected with push rod 24, correspondingly, lower house 20 is provided with pilot hole 23, push rod 24 is through pilot hole 23, push rod 24 end and T-shaped push rod 6 close contact (push rod 24 of a fluid pressure type micrometric displacement amplifier unit 4 and one end close contact of T-shaped push rod 6, the push rod 24 of another fluid pressure type micrometric displacement amplifier unit 4 and the other end close contact of T-shaped push rod 6), inditron 16 is positioned at above liquid storage pipe 18, and is communicated with liquid storage pipe 18 through upper shell 17, source of parallel light is arranged on inditron 16 side, and correspondingly, inditron 16 opposite side is provided with line array CCD 26, and the light that source of parallel light sends is irradiated on line array CCD 26 through after inditron 16, during use, in liquid storage pipe, fill opaque liquid,
The structure of described source of parallel light is: comprise LED array 28, frosted glass 29 and cylinder lenses 25 that ecto-entad is arranged in order.Also the cylinder lenses 25 for focusing on is provided with between line array CCD 26 and inditron 16.
Described shell is made up of housing 8, the upper cover plate 1 being positioned at housing 8 top and the front shroud 11 that is positioned at housing 8 front portion, housing 8, surrounds a relatively airtight space between upper cover plate 1 and front shroud 11; Be provided with two limited blocks 9 bottom housing 8, pendulum 7 is between two limited blocks 9, and the effect of limited block is: restriction pendulum hunting range.
Connected by screw 15 between described upper shell 17 and lower house 20.
During embody rule, housing 8 inwall is provided with circuit board 2 and L-type bracket 3, L-type bracket 3 is provided with pendulum rotary shaft base 14, Circuits System (comprising microprocessor 31, CCD driving circuit 32, LED drive circuit 34, signal processing circuit 33) is fixing on the circuit board 2, and microprocessor 31 passes upper cover plate 1 by lead-in wire 10(lead-in wire 10; Lead-in wire 10 comprises power lead and data line 30) be connected to power supply and relevant data processing circuit, pendulum rotating shaft 5 is fixed in pendulum rotary shaft base 14, and fluid pressure type micrometric displacement amplifier unit 4 is fixed on L-type support plate 3; LED array 28 is fixed on LED array fixed head 27, and LED array fixed head 27 and line array CCD 26 are all fixed on holder 12, and holder 12 is fixed on L-type bracket 3 by holder bracket 13.
The principle of work of a kind of digital level sensor of the present invention is: under gravity, pendulum 7 always tries hard to keep plummet direction, when shell tilts with measured object, opposite shell is swung an angle (pitch angle Δ Q) by pendulum 7, thus drive T-shaped push rod 6 to rotate same angle, and promote push rod 24 and produce corresponding Wei Yi ⊿ L
1, by Jian Ce ⊿ L
1just can obtain the pitch angle Δ Q(tan Δ Q=⊿ L of shell
1/ h, its principle is known mathematical general knowledge, does not repeat them here).⊿ L
1detection limit process is: when push rod 24 produces displacement, and the diaphragm 19 in corresponding liquid storage pipe 18 also produces identical Wei Yi ⊿ L
1, and then make liquid length in inditron 16 produce corresponding change, variable quantity is ⊿ L
2， Qie ⊿ L
2=(D/a)
2⊿ L
1.
The derivation of equation is as follows: because liquid is incompressible, have S
d⊿ L
1=S
a⊿ L
2
Wherein S
d=л (D/2)
2s
a=л (a/2)
2
Therefore have л (D/2)
2⊿ L
1=л (a/2)
2⊿ L
2
Arrange get ⊿ L
2=(D/a)
2⊿ L
1
Wherein, D is liquid storage pipe diameter, a be inditron diameter as shown in Figure 9.
By Ce Liang ⊿ L
2with regard to Ke get Dao ⊿ L
1， ⊿ L
2measuring process be, the light signal that source of parallel light sends, can do not passed in the past by the part optical signals that the liquid (liquid is opaque liquid) in transparent inditron 16 blocks, the picture dot of line array CCD 26 can receive light signal, export as digital signal " 1 " (after signal processing circuit process), and just passed not pass by by the part optical signals that the liquid in transparent inditron 16 blocks, the picture dot of line array CCD 26 does not receive light signal, exports as digital signal " 0 ".Microprocessor 31 must arrive ⊿ L according to predetermined algorithm to digital signal processing
2(when measured object tilts, in two inditrons, liquid level occurs differential, accepts the picture dot number of light signal not equal in two CCD, and microprocessor carrys out Que Ding ⊿ L by calculating its difference
2, its principle is proven technique in prior art, does not repeat them here), and then get Dao ⊿ L
1, and according to tan Δ Q=⊿ L
1/ h obtains pitch angle Δ Q, determines levelness finally by Δ Q.(note: ⊿ L
2=(N
2-N
1) d/2 wherein, N
1, N
2be respectively the picture dot number by illumination in two CCD, d is inter-pixel distance).
Fluid pressure type micrometric displacement amplifier unit has been that the effect of pre-converter (experiences Bei Ce Liang ⊿ L
1and be transformed to and Bei Ce Liang ⊿ L by CCD
1have the electricity determining relation), also play simultaneously and propose high-resolution effect and (such as get (D/a)
2=100, be then equivalent to Ba ⊿ L
1amplify 100 times, wherein ， ⊿ L
2=(D/a)
2⊿ L
1, D is liquid storage pipe diameter, and a is inditron diameter, as shown in Figure 9, when getting the inter-pixel of CCD apart from when being 0.01mm, Ze Dui ⊿ L
1resolution become from 0.01mm, 0.01mm/100=0.0001mm).
Claims (6)
1. a digital level sensor, is characterized in that: comprise shell, is provided with Circuits System, hangs pendulum parts, fluid pressure type micrometric displacement amplifier unit and source of parallel light in shell, wherein,
The structure of described Circuits System is: comprise microprocessor, CCD driving circuit, LED drive circuit, signal processing circuit and line array CCD, and wherein, microprocessor is connected with the LED array of source of parallel light by LED drive circuit; Microprocessor is connected with line array CCD by CCD driving circuit; Microprocessor is connected with signal processing circuit, and signal processing circuit is connected with line array CCD;
The described structure hanging pendulum parts is: comprise pendulum, T-shaped push rod, pendulum rotating shaft, pendulum is flexibly connected with pendulum rotating shaft by T-shaped push rod;
Described fluid pressure type micrometric displacement amplifier unit has two, its structure is: the inditron comprising liquid storage pipe and be made up of transparent material, wherein, liquid storage pipe is fastened by upper shell and lower house and is formed, and is provided with diaphragm in liquid storage pipe, push pedal is provided with below diaphragm, push pedal bottom is connected with push rod, and correspondingly, lower house is provided with pilot hole, push rod passes pilot hole, push rod end and T-shaped push rod close contact; The push rod of a fluid pressure type micrometric displacement amplifier unit and one end close contact of T-shaped push rod, the push rod of another fluid pressure type micrometric displacement amplifier unit and the other end close contact of T-shaped push rod; Inditron is positioned at above liquid storage pipe, and is communicated with liquid storage pipe through upper shell; Source of parallel light is arranged on inditron side, and correspondingly, inditron opposite side is provided with line array CCD, and the light that source of parallel light sends is irradiated on line array CCD through after inditron;
Liquid in inditron is opaque, the light that source of parallel light sends is through to be irradiated to after inditron on line array CCD and to produce corresponding digital signal, when measured object tilts, in two inditrons, liquid level occurs differential, and microprocessor obtains levelness by the picture dot number mathematic interpolation accepting light signal in two line array CCDs.
2. digital level sensor according to claim 1, is characterized in that: the structure of described source of parallel light is: comprise LED array, frosted glass and cylinder lenses that ecto-entad is arranged in order; Also the cylinder lenses for focusing on is provided with between line array CCD and inditron.
3. digital level sensor according to claim 1, it is characterized in that: described shell is made up of housing, the upper cover plate being positioned at housing upper and the front shroud that is positioned at housing front portion, housing, between upper cover plate and front shroud, surround a relatively airtight space; Housing bottom is provided with two limited blocks, and pendulum is between two limited blocks.
4. digital level sensor according to claim 1, is characterized in that: be connected by screw between upper shell and lower house.
5. digital level sensor according to claim 1, is characterized in that: described diaphragm is rubber diaphragm.
6. the digital level sensor according to any one of Claims 1 to 5, it is characterized in that: described inner walls is provided with circuit board and L-type bracket, L-type bracket is provided with pendulum rotary shaft base, microprocessor, CCD driving circuit, LED drive circuit, signal processing circuit are all fixing on circuit boards, microprocessor is connected to outside power supply and relevant data processing circuit by lead-in wire (10), pendulum rotating shaft is fixed in pendulum rotary shaft base, and fluid pressure type micrometric displacement amplifier unit is fixed on L-type bracket; LED array is fixed on LED array fixed head, and LED array fixed head and line array CCD are all fixed on holder, and holder is fixed on L-type bracket by holder bracket.
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|---|---|---|---|
| CN201410026868.9A CN103759712B (en) | 2014-01-21 | 2014-01-21 | A kind of digital level sensor |
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|---|---|---|---|
| CN201410026868.9A CN103759712B (en) | 2014-01-21 | 2014-01-21 | A kind of digital level sensor |
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| CN103759712B true CN103759712B (en) | 2015-08-12 |
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| CN104359409B (en) * | 2014-11-27 | 2017-02-22 | 上海电力学院 | Optics-based high-precision displacement sensor |
| CN111262639B (en) * | 2020-01-17 | 2022-05-17 | 深圳市星网荣耀科技有限公司 | Satellite portable communication device and self-adaptive horizontal adjustment method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE334752B (en) * | 1969-06-23 | 1971-05-03 | Bolinder Munktell | |
| GB9604279D0 (en) * | 1996-02-29 | 1996-05-01 | Eddison Alan M | Downhole tool |
| CN2624179Y (en) * | 2003-06-02 | 2004-07-07 | 江苏大学 | Omnibearing digital electronic level gauge |
| DE102007050292A1 (en) * | 2007-10-22 | 2009-04-23 | Robert Bosch Gmbh | Marking and / or leveling device |
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