CN204128618U - Contact-free level measuring system - Google Patents
Contact-free level measuring system Download PDFInfo
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- CN204128618U CN204128618U CN201420508579.8U CN201420508579U CN204128618U CN 204128618 U CN204128618 U CN 204128618U CN 201420508579 U CN201420508579 U CN 201420508579U CN 204128618 U CN204128618 U CN 204128618U
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Abstract
The utility model discloses a kind of contact-free level measuring system, hinge 3 sidewalls orthogonal fixed sample pipe clamp gripping arm one end, the described sample hose clamping limb other end arranges clamping termination, described clamping termination fastening clamp sample hose 1, described hinge 3 right wing leaf 21 installs light emission cavity 6, the left flabellum 20 of described hinge 3 installs CCD receiving cavity 14, and described CCD receiving cavity 14 rear end, by the capping of CCD receiving cavity back shroud, prevents light leak; Described smooth emission cavity 6 clamped sample pipe side middle panel is groove shapes, light emission cavity outgoing collimating slit 8 is offered along groove shapes position, described CCD receiving cavity 14 clamped sample pipe side middle panel is also groove shapes, offers the incident collimating slit 16 of CCD receiving cavity along groove shapes position.
Description
Technical field
The utility model relates to automatic field, particularly relates to a kind of contact-free level measuring system.
Background technology
The height of liquid working substance in container and be the important technology parameter must monitored/detect in a lot of work highly over time.The Method and Technology of level gauging has had a lot, substantially can be divided into contact and contactless two large classes.Contactless measurement is not owing to directly contacting with liquid working substance, and its advantage is self-evident.Light wave, ultrasound wave even radioactive isotope etc. are all the means that contactless level gauging is conventional.But need to be measured by lighttight non-contact liquid level measuring arrangement in implementation procedure, this needs corresponding exact instrument to carry out Measurement accuracy, this just those skilled in the art need the technical matters of solution badly.
Utility model content
The utility model is intended at least solve the technical matters existed in prior art, especially innovatively proposes a kind of contact-free level measuring system.
In order to realize above-mentioned purpose of the present utility model, the utility model provides a kind of contact-free level measuring system, its key is, comprise light emission cavity 6 and CCD receiving cavity 14, described smooth emission cavity 6 has light emission cavity outgoing collimating slit 8, described CCD receiving cavity 14 has the incident collimating slit 16 of CCD receiving cavity, when contact-free level measuring system works, the light that in light emission cavity 6, luminophor sends is through light emission cavity outgoing collimating slit 8, enter CCD receiving cavity 14 through incident this light path of collimating slit 16 of CCD receiving cavity to be received by CCD, sample hose to be in described light path and light to be parallel to the direction of sample hose bus by described sample hose.
The beneficial effect of technique scheme is: can clamped sample pipe by light emission cavity 6 and CCD receiving cavity 14, and compact conformation is small and exquisite, and portability is strong, automaticity is high, installation and removal easily, have applicability widely, and indoor or open air all can use; Non-contact measurement, is applicable to the level sensing of the high workplace of high pressure, inflammable and explosive, high toxicity and purity requirement.
Described contact-free level measuring system, preferably, comprising: sample hose clamping limb, clamping termination, hinge 3, light emission cavity 6, CCD receiving cavity 14, CCD receiving cavity back shroud 15, light emission cavity outgoing collimating slit 8, the incident collimating slit 16 of CCD receiving cavity;
Hinge 3 sidewalls orthogonal fixed sample pipe clamp gripping arm one end, the described sample hose clamping limb other end arranges clamping termination, described clamping termination fastening clamp sample hose 1, described hinge 3 right wing leaf 21 installs light emission cavity 6, the left flabellum 20 of described hinge 3 installs CCD receiving cavity 14, described CCD receiving cavity 14 rear end, by the capping of CCD receiving cavity back shroud, prevents light leak; Described smooth emission cavity 6 clamped sample pipe side middle panel is groove shapes, light emission cavity outgoing collimating slit 8 is offered along groove shapes position, described CCD receiving cavity 14 clamped sample pipe side middle panel is also groove shapes, offers the incident collimating slit 16 of CCD receiving cavity along groove shapes position.
The beneficial effect of technique scheme is: detected by light emission cavity outgoing collimating slit 8, the incident collimating slit of CCD receiving cavity 16 pairs of sample hose liquid levels, while ensure that the accuracy of detection, prevent light scattering, partially penetrate.
Described contact-free level measuring system, preferably, described sample hose clamping limb comprises: clamping limb 9, upper clamping limb lock screw 4, lower clamping limb lock screw 10, upper sleeve pipe 28, running casing 29 under clamping limb 2, sample hose on sample hose;
Described clamping termination comprises: sample hose top lock screw 5, sample hose bottom lock screw 11, upper clamping termination 12 and lower clamping termination 13;
Upper sleeve pipe 28 one end of clamping limb 2 outside interference cover access on described sample hose, described upper sleeve pipe 28 sidewall offers threaded hole, upper clamping limb lock screw 4 is screwed into threaded hole, described upper clamping limb lock screw 4 external thread matches with threaded hole internal thread, sleeve pipe 28 and clamping limb 2 on sample hose in locking, the fixing upper clamping termination 12 of described upper sleeve pipe 28 other end, in upper clamping termination 12, sidewall offers threaded hole, sample hose top lock screw 5 is screwed into threaded hole, described sample hose top lock screw 5 external thread matches with threaded hole internal thread, locking clamps termination 12 and sample hose 1,
Clamping limb 9 outside interference cover access running casing 29 one end under described sample hose, described running casing 29 sidewall offers threaded hole, lower clamping limb lock screw 10 is screwed into threaded hole, described lower clamping limb lock screw 10 external thread matches with threaded hole internal thread, locking running casing 29 and clamping limb 9 under sample hose, the fixing lower clamping termination 13 of described running casing 29 other end, in lower clamping termination 13, sidewall offers threaded hole, sample hose bottom lock screw 11 is screwed into threaded hole, described sample hose bottom lock screw 11 external thread matches with threaded hole internal thread, the lower clamping termination 13 of locking and sample hose 1.
The beneficial effect of technique scheme is: said apparatus, for locking sample hose, ensures that sample hose is up and down perpendicular to bottom surface, ensures to measure accurately simultaneously.
Described contact-free level measuring system, preferably, also comprises: anti-light shade flap 7;
Described smooth emission cavity 6 installs anti-light shade flap 7 in the edge of the other end side plate installing hinge, or in the edge of the other end side plate installing hinge, anti-light shade flap 7 is installed in described CCD receiving cavity 14, described anti-light shade flap 7 leans out edge along side board edge place, is covered in the gap of described smooth emission cavity 6 and CCD receiving cavity 14 apposition.
The beneficial effect of technique scheme is: block effect by anti-light shade flap 7, by the gap shielding between light emission cavity and CCD receiving cavity 14, extraneous light cannot be injected, thus ensures the accuracy measured.
Described contact-free level measuring system, preferably, described hinge 3 comprises: calibration hole 23, first calibration screw 26, second calibration screw 27;
The left flabellum of described hinge 3 20 and hinge 3 right wing leaf 21 offer N number of calibration hole 23 respectively, penetrate described calibration hole 23 by the first calibration screw 26 and the second calibration screw 27 and be screwed into side plate, the diameter of pipe 1 adjusts the first calibration screw 26, second calibration screw 27 per sample, described smooth emission cavity 6 and CCD receiving cavity 14 is made to receive light feedback data smoothly, described N >=2.
The beneficial effect of technique scheme for: light emission cavity and CCD receiving cavity hinge is installed side calibration hole and calibration screw are all set, thus can the size of pipe diameter per sample, the gap width easily clamped between adjustment light emission cavity and CCD receiving cavity.
Described contact-free level measuring system, preferably, described smooth emission cavity 6 comprises: optical transmission circuit plate 17,
Described CCD receiving cavity 14 comprises: line array CCD 18 and CCD circuit board for receiving 19;
It is inner that described optical transmission circuit plate 17 is installed on described smooth emission cavity 6, by optical transmission circuit plate 17 utilizing emitted light information through light emission cavity outgoing collimating slit 8, the line array CCD 18 of described CCD receiving cavity 14 is arranged in incident collimating slit 16 place of CCD receiving cavity, receive optical information data, line array CCD connects CCD circuit board for receiving 19;
Described CCD circuit board for receiving 19 comprises: front-end driven data acquisition module AFE, FPGA, data transmission interface, control module;
Described front-end driven data acquisition module AFE connects line array CCD, receives the optical information data of line array CCD transmission, completes two sampling and the AD conversion of simulation ccd image signal; The described front-end driven data acquisition module AFE other end connects FPGA, described FPGA connection data transmission interface and control module.
The beneficial effect of technique scheme is: by the design of foregoing circuit, thus accurately measures sample hose liquid level by electron optic mode, thus reduces the error of manual measurement, ensures the accuracy measured.
Described contact-free level measuring system, preferably, described groove shapes comprises: trapezoidal or semicircle.
The beneficial effect of technique scheme is: be set to trapezoidal groove and ensure light emission cavity and the better clamped sample pipe of CCD receiving cavity, being set to semicircle is to ensure that groove and sample hose sample hose fit tightly, and increases the sample hose difficult drop-off that friction factor ensures light emission cavity and the clamping of CCD receiving cavity.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are:
1 compact conformation is small and exquisite, and portability is strong, and automaticity is high, and installation and removal easily, have applicability widely, and indoor or open air all can use;
2 non-contact measurements, are applicable to the level sensing of the high workplace of high pressure, inflammable and explosive, high toxicity and purity requirement;
3 low-power consumption, can adopt various ways to power, battery, photovoltaic, civil power;
4 data processings are quick, and frame per second is adjustable, and data output content can option and installment;
5 have wireless data transfer capability, can detect data by collection in worksite, also can pass through wireless transmitting system remote transmission;
Additional aspect of the present utility model and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the utility model contact-free level measuring system overall schematic;
Fig. 2 is the utility model contact-free level measuring system side schematic diagram;
Fig. 3 is the utility model contact-free level measuring system tangent plane cross-sectional schematic;
Fig. 4 is the utility model contact-free level measuring system schematic top plan view;
Fig. 5 is the utility model contact-free level measuring system tangent plane schematic diagram;
Fig. 6 is the utility model contact-free level measuring system testing circuit schematic diagram;
Fig. 7 is the utility model contact-free level measuring method process flow diagram;
Fig. 8 is the utility model contact-free level measuring method Static Detection process flow diagram;
Fig. 9 is the utility model contact-free level measuring method detection of dynamic process flow diagram;
Figure 10 is the experiment schematic diagram of the utility model contact-free level measuring system;
Figure 11 is the circuit diagram of the utility model contact-free level measuring system;
Figure 12 is the circuit diagram of the utility model contact-free level measuring system;
Figure 13 is the circuit diagram of the utility model contact-free level measuring system;
Figure 14 is the circuit diagram of the utility model contact-free level measuring system;
Figure 15 is the circuit diagram of the utility model contact-free level measuring system;
Figure 16 is the circuit diagram of the utility model contact-free level measuring system;
Figure 17 is the circuit diagram of the utility model contact-free level measuring system;
Figure 18 is the circuit diagram of the utility model contact-free level measuring system;
Figure 19 is the circuit diagram of the utility model contact-free level measuring system.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
In description of the present utility model, it will be appreciated that, term " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In description of the present utility model, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
As Figure 1-5, the utility model provides a kind of contact-free level measuring system, its key is, comprise light emission cavity 6 and CCD receiving cavity 14, described smooth emission cavity 6 has light emission cavity outgoing collimating slit 8, described CCD receiving cavity 14 has the incident collimating slit 16 of CCD receiving cavity, when contact-free level measuring system works, the light that in light emission cavity 6, luminophor sends is through light emission cavity outgoing collimating slit 8, enter CCD receiving cavity 14 through incident this light path of collimating slit 16 of CCD receiving cavity to be received by CCD, sample hose to be in described light path and light to be parallel to the direction of sample hose bus by described sample hose.
The beneficial effect of technique scheme is: can clamped sample pipe by light emission cavity 6 and CCD receiving cavity 14, and compact conformation is small and exquisite, and portability is strong, automaticity is high, installation and removal easily, have applicability widely, and indoor or open air all can use; Non-contact measurement, is applicable to the level sensing of the high workplace of high pressure, inflammable and explosive, high toxicity and purity requirement.
Described contact-free level measuring system, preferably, comprising: sample hose clamping limb, clamping termination, hinge 3, light emission cavity 6, CCD receiving cavity 14, CCD receiving cavity back shroud 15, light emission cavity outgoing collimating slit 8, the incident collimating slit 16 of CCD receiving cavity;
Hinge 3 sidewalls orthogonal fixed sample pipe clamp gripping arm one end, the described sample hose clamping limb other end arranges clamping termination, described clamping termination fastening clamp sample hose 1, described hinge 3 right wing leaf 21 installs light emission cavity 6, the left flabellum 20 of described hinge 3 installs CCD receiving cavity 14, described CCD receiving cavity 14 rear end, by the capping of CCD receiving cavity back shroud, prevents light leak; Described smooth emission cavity 6 clamped sample pipe side middle panel is groove shapes, light emission cavity outgoing collimating slit 8 is offered along groove shapes position, described CCD receiving cavity 14 clamped sample pipe side middle panel is also groove shapes, offers the incident collimating slit 16 of CCD receiving cavity along groove shapes position.
The beneficial effect of technique scheme is: detected by light emission cavity outgoing collimating slit 8, the incident collimating slit of CCD receiving cavity 16 pairs of sample hose liquid levels, while ensure that the accuracy of detection, prevent light scattering, partially penetrate.
Described contact-free level measuring system, preferably, described sample hose clamping limb comprises: clamping limb 9, upper clamping limb lock screw 4, lower clamping limb lock screw 10, upper sleeve pipe 28, running casing 29 under clamping limb 2, sample hose on sample hose;
Described clamping termination comprises: sample hose top lock screw 5, sample hose bottom lock screw 11, upper clamping termination 12 and lower clamping termination 13;
Upper sleeve pipe 28 one end of clamping limb 2 outside interference cover access on described sample hose, described upper sleeve pipe 28 sidewall offers threaded hole, upper clamping limb lock screw 4 is screwed into threaded hole, described upper clamping limb lock screw 4 external thread matches with threaded hole internal thread, sleeve pipe 28 and clamping limb 2 on sample hose in locking, the fixing upper clamping termination 12 of described upper sleeve pipe 28 other end, in upper clamping termination 12, sidewall offers threaded hole, sample hose top lock screw 5 is screwed into threaded hole, described sample hose top lock screw 5 external thread matches with threaded hole internal thread, locking clamps termination 12 and sample hose 1,
Clamping limb 9 outside interference cover access running casing 29 one end under described sample hose, described running casing 29 sidewall offers threaded hole, lower clamping limb lock screw 10 is screwed into threaded hole, described lower clamping limb lock screw 10 external thread matches with threaded hole internal thread, locking running casing 29 and clamping limb 9 under sample hose, the fixing lower clamping termination 13 of described running casing 29 other end, in lower clamping termination 13, sidewall offers threaded hole, sample hose bottom lock screw 11 is screwed into threaded hole, described sample hose bottom lock screw 11 external thread matches with threaded hole internal thread, the lower clamping termination 13 of locking and sample hose 1.
The beneficial effect of technique scheme is: said apparatus, for locking sample hose, ensures that sample hose is up and down perpendicular to bottom surface, ensures to measure accurately simultaneously.
Described contact-free level measuring system, preferably, also comprises: anti-light shade flap 7;
Described smooth emission cavity 6 installs anti-light shade flap 7 in the edge of the other end side plate installing hinge, or in the edge of the other end side plate installing hinge, anti-light shade flap 7 is installed in described CCD receiving cavity 14, described anti-light shade flap 7 leans out edge along side board edge place, is covered in the gap of described smooth emission cavity 6 and CCD receiving cavity 14 apposition.
The beneficial effect of technique scheme is: block effect by anti-light shade flap 7, by the gap shielding between light emission cavity and CCD receiving cavity 14, extraneous light cannot be injected, thus ensures the accuracy measured.
Described contact-free level measuring system, preferably, described hinge 3 comprises: calibration hole 23, first calibration screw 26, second calibration screw 27;
The left flabellum of described hinge 3 20 and hinge 3 right wing leaf 21 offer N number of calibration hole 23 respectively, penetrate described calibration hole 23 by the first calibration screw 26 and the second calibration screw 27 and be screwed into side plate, the diameter of pipe 1 adjusts the first calibration screw 26, second calibration screw 27 per sample, described smooth emission cavity 6 and CCD receiving cavity 14 is made to receive light feedback data smoothly, described N >=2.
The beneficial effect of technique scheme for: light emission cavity and CCD receiving cavity hinge is installed side calibration hole and calibration screw are all set, thus can the size of pipe diameter per sample, the gap width easily clamped between adjustment light emission cavity and CCD receiving cavity.
Described contact-free level measuring system, preferably, described smooth emission cavity 6 comprises: optical transmission circuit plate 17,
Described CCD receiving cavity 14 comprises: line array CCD 18 and CCD circuit board for receiving 19;
It is inner that described optical transmission circuit plate 17 is installed on described smooth emission cavity 6, by optical transmission circuit plate 17 utilizing emitted light information through light emission cavity outgoing collimating slit 8, the line array CCD 18 of described CCD receiving cavity 14 is arranged in incident collimating slit 16 place of CCD receiving cavity, receive optical information data, line array CCD connects CCD circuit board for receiving 19;
Described CCD circuit board for receiving 19 comprises: front-end driven data acquisition module AFE, FPGA, data transmission interface, control module;
Described front-end driven data acquisition module AFE connects line array CCD, receives the optical information data of line array CCD transmission, completes two sampling and the AD conversion of simulation ccd image signal; The described front-end driven data acquisition module AFE other end connects FPGA, described FPGA connection data transmission interface and control module.
The beneficial effect of technique scheme is: by the design of foregoing circuit, thus accurately measures sample hose liquid level by electron optic mode, thus reduces the error of manual measurement, ensures the accuracy measured.
Described contact-free level measuring system, preferably, described groove shapes comprises: trapezoidal or semicircle.
The beneficial effect of technique scheme is: be set to trapezoidal groove and ensure light emission cavity and the better clamped sample pipe of CCD receiving cavity, being set to semicircle is to ensure that groove and sample hose sample hose fit tightly, and increases the sample hose difficult drop-off that friction factor ensures light emission cavity and the clamping of CCD receiving cavity.
The utility model also discloses a kind of contact-free level measuring method, and its key is, comprises the steps:
Step 1, carries out initialization to the line array CCD of contact-free level measuring system and CCD circuit board for receiving, starts to measure sample hose liquid level;
Step 2, open optical transmission circuit plate, irradiated sample hose liquid level by the light emission cavity outgoing collimating slit of light emission cavity, the optical information through sample hose is irradiated to the line array CCD at the incident collimating slit place of CCD receiving cavity, is judged optical information intensity by line array CCD;
Step 3, according to optical information intensity judgement sample pipe liquid level, carries out M time to liquid level and measures, and obtains sample hose liquid level absolute altitude value, described M >=3.
The beneficial effect of technique scheme is: by said method Measurement accuracy liquid level, and data processing is quick, and frame per second is adjustable, and data output content can option and installment.
Described contact-free level measuring method, preferably, described step 2 comprises:
Step 2-1, when being judged optical information intensity by line array CCD, the starting position in the beginning register of configuration line array CCD is high-order;
Step 2-2, carries out interrupt routine judgement to the optical information intensity that line array CCD gathers, and leading portion driving data acquisition module is carried out down trigger, and simulated light information signal is converted into digital light information signal, is transferred to FPGA and carries out height computing.
The beneficial effect of technique scheme is: simulating signal is converted into digital signal, ensures that FPGA carries out height computing accurately.
Described contact-free level measuring method, preferably, described step 3 comprises:
Step 3-1, the liquid level value of collection carries out liquid level computing in FPGA;
Step 3-2, sums up pixel corresponding for the optical information frame data of collection on average;
Step 3-3, does difference to adjacent picture elements gray-scale value, and stores this difference in array;
Step 3-4, finds the position that gray scale difference value is maximum, obtains the initial position residing for sample hose liquid level;
Step 3-5, repeats step 3-2 to step 3-4, asks for M group data, be averaging, obtain sample hose liquid level absolute altitude value.
As shown in Figure 6, level gauging head is A:CCD Receiver; B: level gauging master control board; C: data processing centre (DPC), wherein data processing centre (DPC) is far-end server or portable set etc., and data processing centre (DPC) completes the reading of displacement data, storage, process.The mode of digital independent, can select the various ways such as wireless or wired;
Master control borad structure illustrates:
Survey control mainboard, is made up of front-end driven data acquisition module AFE, SOPC operation processing unit FPGA, data transmission interface, Valve controlling 4 parts.
Wherein AFE, completes correlated-double-sampling and the AD conversion of simulation ccd image signal;
Be the basic circuit of CCD measuring head work as shown in figure 11, line array CCD TCD1703 is connected with CCD electrical signal output circuitry with CCD drive singal impact damper, wherein the first electric capacity C1 and the second electric capacity C2 is in parallel, described second electric capacity one end connects power supply 12V other end ground connection, and the OD that described first electric capacity C1 one end connects line array CCD holds the other end to connect SS end.
As Figure 12, shown in 13, for CCD electrical signal output circuitry, complete the conversion of CCD serial charge to voltage signal, it is connected with AFE with line array CCD, wherein first resistance R1 one end connects power supply, the other end connects CCD electrical signal output circuitry OS1 output terminal, the described first resistance R1 other end also connects the first transistor Q1 emitter, described the first transistor Q1 base stage connects the 3rd resistance R3 one end, the described R3 other end connects CCD electrical signal output circuitry OS1 input end, described the first transistor Q1 collector connects the 5th resistance R5 one end, described 5th resistance R5 other end ground connection, described second resistance R2 one end connects power supply, the other end connects CCD electrical signal output circuitry OS2 output terminal, the described second resistance R4 other end also connects transistor seconds Q2 emitter, described transistor seconds Q2 base stage connects the 4th resistance R4 one end, the described R4 other end connects CCD electrical signal output circuitry OS2 input end, described transistor seconds Q2 collector connects the 6th resistance R6 one end, described 6th resistance R6 other end ground connection.
As Figure 14, shown in 15, for CCD drive singal impact damper 74HC245, for completing the conversion of drive signal level, it is connected with CCD electrical signal output circuitry with line array CCD, wherein CCD drive singal impact damper comprises a CCD drive singal impact damper IC2 and the 2nd CCD drive singal impact damper IC3, wherein a CCD drive singal impact damper VCC holds connection the 3rd electric capacity C3 one end and the 4th electric capacity C4 one end, the other end ground connection of described C3 and C4, 2nd CCD drive singal impact damper VCC holds connection the 5th electric capacity C5 one end and the 6th electric capacity C6 one end, the other end ground connection of described C5 and C6.
As shown in figure 17, for front-end driven data acquisition module AFEAD9943, for completing two sampling and the analog to digital conversion of ccd output signal, wherein front-end driven data acquisition module AFE is connected with main control chip FPGACON44 with CCD electrical signal output circuitry, wherein, CCD electrical signal output circuitry OS1 is connected the 13 electric capacity C13 one end of front-end driven data acquisition module AFE with OS2 output terminal, the described C13 other end connects the CCD input end of front-end driven data acquisition module AFE, after described 11 electric capacity C11 and the 12 electric capacity C12 parallel connection, one end ground connection, the C11 other end connects the REFB end of front-end driven data acquisition module AFE, the C12 other end connects the REFT end of front-end driven data acquisition module AFE, after 16 electric capacity C16 and the 17 electric capacity C17 parallel connection, the AVSS end of one end difference ground connection and front-end driven data acquisition module AFE, the other end connects AVDD end and the 3.3v power end of front-end driven data acquisition module AFE respectively, 18 electric capacity C18 one end connects the DRV end of 3.3v power end and front-end driven data acquisition module AFE respectively, other end ground connection, 19 electric capacity C19 one end connects the DRD end of 3.3v power end and front-end driven data acquisition module AFE respectively, other end ground connection.
As shown in figure 16, for carrying the mainboard DIP34*2 of FPGA:
FPGA, embedded 1. noisII kernel and multiple user logic, comprise 2. CCD driver' s timing and produce correlated-double-sampling sequential and output timing in logic, 3. AFE and produce logic, 4. image frame data synchronous sequence and produce logic, 5. Parallel image data and gather stored logic, 6. liquid level information or image output module, 7. valve switch control.Logic 2.-be 5. encapsulated in (following Fig. 6) in front-end driven acquisition module, this module is independently developed logical ip.
As shown in figure 18, be the core board of FPGA, inside comprises CCD drive singal module and data processing module, and it is connected with CCD drive singal impact damper, AFE module etc. with line array CCD by mainboard.
As shown in figure 19, for communication interface MAX3232CSE, it is connected with host computer with FPGA, wherein RS232DB9 connects communication interface, 15 electric capacity C15 one end connects communication interface C1+ end, the described 15 electric capacity C15 other end connects C1-end, 14 electric capacity one end connects 3.3v power supply, the other end connects communication interface V+ end, 26 electric capacity C26 one end connects communication interface C2+ end, the 26 electric capacity C26 other end connects C2-end, 27 electric capacity C27 one end ground connection, the C27 other end connects communication interface V-end, 23 electric capacity C23 one end ground connection, the other end connects communication interface VCC end, 14 resistance R14 one end connects communication interface Tin1 end, other end connecting luminous diode TXD negative pole, described light emitting diode TXD positive pole connects power supply 3.3v, 15 resistance R15 one end connects Rout1 end, other end connecting luminous diode RXD negative pole, described light emitting diode RXD positive pole connects power supply 3.3v.
As shown in Figure 7, step 1, carries out initialization to contact-free level measuring system,
Initialization task:
1.AFE configures
2. initialization data stores array or address
3.CCD driver module initialization of register
4. other initialization of software systems;
Step 2, starts to carry out level gauging, and the start position in configuration CCDSTART register is high,
Step 3, calculates current level interface location according to pre-defined algorithm;
Extract border pixel numbering, calculate absolute liquid level; Export liquid level information.
Static measurement flow process:
Measure after starting, static level gauging can experience 3 stages, and as Fig. 8, be 1. front end liquid level analog information Collect conversion respectively, 2. in FPGA, liquid level data moves storage, and 3. in FPGA, algorithm runs and obtains liquid level information.In FPGA ping-pong ram assistance under, 1. and 2. can perform by part parallel.1., after 2. process completes, 3. process process is performed.
Above Fig. 8 single measurement is example, illustrates static liquid level surveying work flow process.In sample hose, liquid level information is by after the detection of front end sensors measuring head, analog video signal can be exported in high speed serialization mode, output speed size is decided by the frequency of operation of front end sensors measuring head, supposes that frequency of operation is 1MHz, and so every 1us will export a vision signal.The sensor that this liquid level emasuring device is equipped with is TCD1703C, comprises 7500 effective video signal elements, is divided into two video interface parallel outputs, and therefore all signal output needs 3.75ms.Each vision signal is converted into 10bit digital signal through AFE (analog front end) device, completes the first stage process of measurement to this.Subordinate phase starts, 3750 of one of them video interface digital of digital video data are stored in the embedded ping-pong ram of FPGA, the ping-pong ram degree of depth 512, when the RAM of in ping-pong ram stores completely, in FPGA, front-end driven data acquisition module can output to nios core by triggered interrupts, and have no progeny during nois core receives to read to store and expire the video data in RAM and store, the data of next conversion are stored in another RAM, repeat this process, until complete 3750 data move storage.Phase III emphasis runs the computing of liquid level algorithm to obtain liquid level information.
Kinetic measurement flow process:
Kinetic measurement flow process and static measurement flow process similar, unlike, if repeat static measurement continuously, just can obtain the change information of liquid level, industrial process status information can be obtained for the Management and application of liquid level change information in sample hose.Dynamic liquid level measurement comprises 4 stages: 1. front end liquid level analog information Collect conversion, and 2. in FPGA, liquid level data moves storage, and 3. in FPGA, algorithm runs and obtains liquid level information, 4. Liquid level.As Fig. 9.
As shown in Figure 10, be the oscillogram that contact-free level measuring system detects, according to the height of the intensity determination liquid level of light.
The beneficial effects of the utility model:
1 compact conformation is small and exquisite, and portability is strong, and automaticity is high, and installation and removal easily, have applicability widely, and indoor or open air all can use;
2 non-contact measurements, are applicable to the level sensing of the high workplace of high pressure, inflammable and explosive, high toxicity and purity requirement;
3 low-power consumption, can adopt various ways to power, battery, photovoltaic, civil power;
4 data processings are quick, and frame per second is adjustable, and data output content can option and installment;
5 have wireless data transfer capability, can detect data by collection in worksite, also can pass through wireless transmitting system remote transmission.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and aim, scope of the present utility model is by claim and equivalents thereof.
Claims (7)
1. a contact-free level measuring system, it is characterized in that, comprise light emission cavity (6) and CCD receiving cavity (14), described smooth emission cavity (6) has light emission cavity outgoing collimating slit (8), described CCD receiving cavity (14) has the incident collimating slit (16) of CCD receiving cavity, when contact-free level measuring system works, the light that light emission cavity (6) interior luminophor sends is through light emission cavity outgoing collimating slit (8), enter CCD receiving cavity (14) through incident collimating slit (16) this light path of CCD receiving cavity to be received by CCD, sample hose to be in described light path and light to be parallel to the direction of sample hose bus by described sample hose.
2. contact-free level measuring system according to claim 1, it is characterized in that, comprising: sample hose clamping limb, clamping termination, hinge (3), light emission cavity (6), CCD receiving cavity (14), CCD receiving cavity back shroud (15), light emission cavity outgoing collimating slit (8), the incident collimating slit (16) of CCD receiving cavity;
Hinge (3) sidewalls orthogonal fixed sample pipe clamp gripping arm one end, the described sample hose clamping limb other end arranges clamping termination, described clamping termination fastening clamp sample hose (1), described hinge (3) right wing leaf (21) installs light emission cavity (6), described hinge (3) left flabellum (20) installs CCD receiving cavity (14), described CCD receiving cavity (14) rear end, by the capping of CCD receiving cavity back shroud, prevents light leak; Described smooth emission cavity (6) clamped sample pipe side middle panel is groove shapes, light emission cavity outgoing collimating slit (8) is offered along groove shapes position, described CCD receiving cavity (14) clamped sample pipe side middle panel is also groove shapes, offers the incident collimating slit (16) of CCD receiving cavity along groove shapes position.
3. contact-free level measuring system according to claim 2, it is characterized in that, described sample hose clamping limb comprises: clamping limb (9), upper clamping limb lock screw (4), lower clamping limb lock screw (10), upper sleeve pipe (28), running casing (29) under clamping limb (2), sample hose on sample hose;
Described clamping termination comprises: sample hose top lock screw (5), sample hose bottom lock screw (11), upper clamping termination (12) and lower clamping termination (13);
Upper sleeve pipe (28) one end of clamping limb (2) outside interference cover access on described sample hose, described upper sleeve pipe (28) sidewall offers threaded hole, upper clamping limb lock screw (4) is screwed into threaded hole, described upper clamping limb lock screw (4) external thread matches with threaded hole internal thread, sleeve pipe (28) and clamping limb (2) on sample hose in locking, termination (12) is clamped on described upper sleeve pipe (28) other end is fixing, threaded hole is offered at upper clamping termination (12) sidewall, sample hose top lock screw (5) is screwed into threaded hole, described sample hose top lock screw (5) external thread matches with threaded hole internal thread, locking clamps termination (12) and sample hose (1),
Clamping limb (9) outside interference cover access running casing (29) one end under described sample hose, described running casing (29) sidewall offers threaded hole, lower clamping limb lock screw (10) is screwed into threaded hole, described lower clamping limb lock screw (10) external thread matches with threaded hole internal thread, locking running casing (29) and clamping limb (9) under sample hose, termination (13) is clamped under described running casing (29) other end is fixing, threaded hole is offered at lower clamping termination (13) sidewall, sample hose bottom lock screw (11) is screwed into threaded hole, described sample hose bottom lock screw (11) external thread matches with threaded hole internal thread, termination (13) and sample hose (1) is clamped under locking.
4. contact-free level measuring system according to claim 1, is characterized in that, also comprise: anti-light shade flap (7);
Described smooth emission cavity (6) installs anti-light shade flap (7) in the edge of the other end side plate installing hinge, or in the edge of the other end side plate installing hinge, anti-light shade flap (7) is installed described CCD receiving cavity (14), described anti-light shade flap (7) leans out edge along side board edge place, is covered in the gap of described smooth emission cavity (6) and CCD receiving cavity (14) apposition.
5. contact-free level measuring system according to claim 2, is characterized in that, described hinge (3) comprising: calibration hole (23), the first calibration screw (26), the second calibration screw (27);
Described hinge (3) left flabellum (20) and hinge (3) right wing leaf (21) offer N number of calibration hole (23) respectively, penetrate described calibration hole (23) by the first calibration screw (26) and the second calibration screw (27) and be screwed into side plate, the diameter of managing (1) per sample adjusts the first calibration screw (26), the second calibration screw (27), described smooth emission cavity (6) and CCD receiving cavity (14) is made to receive light feedback data smoothly, described N >=2.
6. contact-free level measuring system according to claim 1, is characterized in that, described smooth emission cavity (6) comprising: optical transmission circuit plate (17),
Described CCD receiving cavity (14) comprising: line array CCD (18) and CCD circuit board for receiving (19);
It is inner that described optical transmission circuit plate (17) is installed on described smooth emission cavity (6), by optical transmission circuit plate (17) utilizing emitted light information through light emission cavity outgoing collimating slit (8), the line array CCD (18) of described CCD receiving cavity (14) is arranged in incident collimating slit (16) place of CCD receiving cavity, receive optical information data, line array CCD connects CCD circuit board for receiving (19);
Described CCD circuit board for receiving (19) comprising: front-end driven data acquisition module AFE, FPGA, data transmission interface, control module;
Described front-end driven data acquisition module AFE connects line array CCD, receives the optical information data of line array CCD transmission, completes two sampling and the AD conversion of simulation ccd image signal; The described front-end driven data acquisition module AFE other end connects FPGA, described FPGA connection data transmission interface and control module.
7. contact-free level measuring system according to claim 1, is characterized in that, described groove shapes comprises: trapezoidal or semicircle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420508579.8U CN204128618U (en) | 2014-09-05 | 2014-09-05 | Contact-free level measuring system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420508579.8U CN204128618U (en) | 2014-09-05 | 2014-09-05 | Contact-free level measuring system |
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| CN204128618U true CN204128618U (en) | 2015-01-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236665A (en) * | 2014-09-05 | 2014-12-24 | 重庆中孚科技有限公司 | Non-contact type liquid level measuring system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236665A (en) * | 2014-09-05 | 2014-12-24 | 重庆中孚科技有限公司 | Non-contact type liquid level measuring system and method |
| CN104236665B (en) * | 2014-09-05 | 2017-08-25 | 重庆理工大学 | Contact-free level measuring system and method |
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