CN101271065B - Intelligent turbidity instrument - Google Patents
Intelligent turbidity instrument Download PDFInfo
- Publication number
- CN101271065B CN101271065B CN2008100232639A CN200810023263A CN101271065B CN 101271065 B CN101271065 B CN 101271065B CN 2008100232639 A CN2008100232639 A CN 2008100232639A CN 200810023263 A CN200810023263 A CN 200810023263A CN 101271065 B CN101271065 B CN 101271065B
- Authority
- CN
- China
- Prior art keywords
- output
- input
- chip microcomputer
- voltage follower
- signal
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention discloses an intelligent turbidimeter which connects the light signal to a silicon photocell and then serially connects to the input of a single-chip microcomputer to process the signal; the output of the single-chip microcomputer is connected with an LCD screen and a field bus; the field bus sends the processed signal to the host of the turbidimeter; a conditioning circuit is serially connected between the silicon photocell and the single-chip microcomputer; the conditioning circuit is a matching circuit consisting of an amplifying circuit and a voltage follower which are connected by a resistor; the input and the output of an amplifier are parallely connected with a first feedback resistor; an adjustable resistor is connected between two legs of the amplifier; the input and the output of the voltage follower are parallely connected with a second feedback resistor; the input of the voltage follower is connected with a slide rheostat (P201); the slide rheostat (P201), a capacitor (C201), an electrolytic capacitor (E201) and a three-terminal voltage stabilizer are connected parallely; the voltage follower makes the output resistance close to zero and the output voltage stable, to provide a static working point for transporting and placing an internal transistor; the output signal is not distorted; the anti-interference capability is strong; the current offset is low; and the noise is low.
Description
Technical field
The present invention relates to a kind of turbidity pick-up unit, be mainly used in fields such as monitoring water environment, aquaculture, biological fermentation engineering.
Background technology
Use more turbidity pick-up unit to have two kinds at present, the one, the online turbidimeter of scattered light formula is that a kind of scattering and transmission multi-pass compare and measure the instrument that draws liquid look turbidity.Its principle of work is to utilize the not liquid body colourity influence of scattered light of suspended particle in liquid, and the scattered light and the transmitted light that allow photoelectric cell accept fluid to be measured compare measurement, draw the chromatic value and the turbidity value that need to survey liquid respectively.Wherein the resulting scattered light signal of transducing part comes overall treatment by control circuit, is sent to the turbidimeter main frame with serial signal again, and main frame is handled the turbidity data, and shows by liquid crystal display.The 2nd, with modulated light source luminous intensity measurement turbidimeter, the signal that collects is passed through bandpass filtering, rectification, low-pass filtering, thereby obtain the turbidity signal, single-chip microcomputer is as the core of hardware, and it and intercomputer adopt the RS232 communication.But these two kinds of turbidimeters are defectiveness when detecting, the one, because the signal that detects has only fainter μ A level, cause the whole instrument poor anti jamming capability, and measurement result accuracy is relatively poor.The 2nd, great majority all are desk-top turbidimeters, promptly can only be applied to sampling measurement, turbidity that can not the continuous coverage flowing liquid.
Summary of the invention
The present invention provides a kind of intelligent turbidity instrument in order to overcome the deficiencies in the prior art, can accurately detect turbidity continuously.
The technical solution used in the present invention is: light signal is connected the input end that is concatenated into single-chip microcomputer behind the photoelectric cell again carry out signal Processing, the output of single-chip microcomputer connects liquid crystal display and fieldbus, the signal that fieldbus will be handled is sent to the turbidimeter main frame, photoelectric cell adopts silicon photocell, the modulate circuit of between photoelectric cell and single-chip microcomputer, also connecting, described modulate circuit is a match circuit that is linked to be with resistance by amplifying circuit and voltage follower, at the input and output side of amplifier first feedback resistance in parallel, between the bipod of amplifier, connect an adjustable resistance; At the input and output side of voltage follower second feedback resistance in parallel, the input end of voltage follower also connects slide rheostat, and slide rheostat and electric capacity, electrochemical capacitor and three terminal regulator are in parallel.
The present invention is close to zero output resistance and the output voltage value stabilization after by voltage follower, for the transistor of amplifier inside provides a quiescent point, makes transistor be operated in the amplification region, improves carrying load ability, and output signal does not produce distortion.Antijamming capability is strong, current offset is low, noise is low.Simultaneously advanced person's field bus technique is dissolved into the turbidity detector, is convenient to measure and control at worker, agriculture field network.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is a hardware configuration connection diagram of the present invention;
Fig. 2, Fig. 3 are the circuit diagrams of modulate circuit 4 among Fig. 1;
Fig. 4 is the communication interface modules structural drawing of fieldbus 7 among Fig. 1.
Embodiment
As Fig. 1, light signal 1 is connected silicon photocell 2, silicon photocell 2 is as measuring sensor probe, silicon photocell 2 converts scattered light signal 1 to the input end of a modulate circuit 4 to single-chip microcomputer 5 that connect in series again behind the current signal 3, single-chip microcomputer 5 carries out signal Processing, the output of single-chip microcomputer 5 connects liquid crystal display 8 and fieldbus 7, the signal that fieldbus 7 will be handled is sent to the turbidimeter main frame, single-chip microcomputer 5 adopts the RS232 communication modes to link to each other with the turbidimeter main frame, and the communication interface of fieldbus 7 adopts Profibus DP (field bus communication module).
Modulate circuit 4 as Fig. 2 is match circuits that are linked to be with resistance R 204 by amplifying circuit and voltage follower, input end promptly indicates the anode that current i (0～10 μ A) locates to connect silicon photocell 2, indicate the signal output part that the Nout symbol is a modulate circuit 4, the single-chip microcomputer 5 of sending into model and be C8051F020 is controller.In the input and output side of the amplifier CA3140 of amplifying circuit feedback resistance R203 in parallel and capacitor C 202, between the bipod of amplifier CA3140, connect an adjustable resistance P202, the other end of amplifier CA3140 connects resistance R 202 back ground connection.Ground connection behind feedback resistance R205 in parallel of the input and output side between 6,7 pin of voltage follower TL082 and capacitor C 203,5 pin series resistor R206.The 3 pin input ends of voltage follower TL082 also connect slide rheostat P201, and slide rheostat P201 and capacitor C 201, electrochemical capacitor E201 and three terminal regulator LM336 are in parallel.
That the present invention plays amplification is amplifier CA3140, and enlargement factor is by its peripheral feedback resistance R203 decision, like this by the output voltage of signal conditioning circuit: U=iR
203., and the amplifier of its back is voltage follower TL082, the power supply that they use all is ± 12V mainly to play impedance matching, raising input resistance, reduction output resistance, raising carrying load ability.
Ag among Fig. 3 connects the negative terminal of silicon photocell 2.Negative terminal to silicon photocell 2, be that the signal ground end does not directly join with ground, but allow its virtual earth, earlier voltage is stabilized in certain value Uol with a three terminal regulator LM336 and electrochemical capacitor E201, capacitor C 201, slide rheostat P201, and make its value less times greater than cut-in voltage Uon=0.7V, the back is by amplifier TL082, this moment, output resistance was close to zero, make the magnitude of voltage of output also be stabilized in Uol, for the transistor of amplifier inside provides a quiescent point, make transistor be operated in the amplification region, output signal does not produce distortion.
The present invention considers the influence of water temperature to turbidity, and temperature compensation has been carried out in the measurement of turbidity, and precision height and few platinum resistance of response time are adopted in the measurement of temperature.Its principle is to use the temperature-measurement principle that platinum resistance changes with the variation of temperature resistance, and the variation of temperature amount to be measured is converted into changes in resistance, further is converted to the variation of electric weight again by bridge diagram.
Shown in Figure 4, C8051F020 single-chip microcomputer 5 is responsible for communication chip SPC3 is carried out initialization, the SPC3 chip uses the 48MHZ crystal oscillator, automatically testbus message transmission rate, SPC3 discerns and receives the data message that sends our station to automatically, and according to the difference of message structure, identify different service access points, data are deposited into corresponding BUF, after SPC3 is connected the IL485 chip by two pins of TXD and RXD, the network of Profibus fieldbus 7 be can insert, move instruction and data communicated with upper configuration computing machine.On the other hand, C8051F020 single-chip microcomputer 5 is deposited outside dual port RAM by the 74HC373 chip, and dual port RAM is as the data buffer that links to each other with the PROFIBUS-DP interface of temperature dissolved oxygen measurement and control instrument.Utilize the two-way interrupt function of dual port RAM, promptly write left port and open the right-hand member interruption, write right output port and can open the characteristics that left end interrupts, the data command of main station monitoring platform is sent to instrument, and correlation parameter is delivered to main website.Each instrument all as a DP slave station of Profibus bus network, can be provided with its station address in program.
Claims (1)
1. intelligent turbidity instrument, the input end that is concatenated into single-chip microcomputer (5) behind light signal (1) the connection photoelectric cell (2) is again carried out signal Processing, the output of single-chip microcomputer (5) connects liquid crystal display (8) and fieldbus (7), the signal that fieldbus (7) will be handled is sent to the turbidimeter main frame, photoelectric cell (2) adopts silicon photocell, the modulate circuit (4) of between photoelectric cell (2) and single-chip microcomputer (5), also connecting, it is characterized in that: described modulate circuit (4) is a match circuit that is linked to be with resistance (R204) by amplifying circuit and voltage follower, at the input and output side of amplifier first feedback resistance (R203) in parallel, between the bipod of amplifier, connect an adjustable resistance (P202); At the input and output side of described voltage follower second feedback resistance (R205) in parallel, the input end of voltage follower also connects slide rheostat (P201), and slide rheostat (P201) and electric capacity (C201), electrochemical capacitor (E201) and three terminal regulator (LM336) are in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100232639A CN101271065B (en) | 2008-04-03 | 2008-04-03 | Intelligent turbidity instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100232639A CN101271065B (en) | 2008-04-03 | 2008-04-03 | Intelligent turbidity instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101271065A CN101271065A (en) | 2008-09-24 |
| CN101271065B true CN101271065B (en) | 2011-08-10 |
Family
ID=40005165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100232639A Expired - Fee Related CN101271065B (en) | 2008-04-03 | 2008-04-03 | Intelligent turbidity instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101271065B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004077B (en) * | 2010-10-08 | 2012-11-07 | 中国农业大学 | Turbidity transducer |
| CN104502673B (en) * | 2014-11-13 | 2017-07-14 | 浙江涵普电力科技有限公司 | The current true virtual value transmitter of AC/DC universal |
| SG11201803313TA (en) | 2015-10-21 | 2018-05-30 | Tendyron Corp | Communication device, adapter device, communication system |
| CN114964322A (en) * | 2022-06-13 | 2022-08-30 | 合肥利弗莫尔仪器科技有限公司 | Photoelectric trigger signal generating device for image scanning |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307086Y (en) * | 2008-12-02 | 2009-09-09 | 江苏大学 | Intelligent turbidimeter |
-
2008
- 2008-04-03 CN CN2008100232639A patent/CN101271065B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307086Y (en) * | 2008-12-02 | 2009-09-09 | 江苏大学 | Intelligent turbidimeter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101271065A (en) | 2008-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203299350U (en) | Battery internal resistance on-line measuring instrument | |
| CN101271065B (en) | Intelligent turbidity instrument | |
| CN103108412A (en) | Remote monitoring system on parameters of aquafarm water quality and control method | |
| CN105536105A (en) | Infusion set monitoring system and monitoring method | |
| CN110609072B (en) | Weak signal detection circuit of Prussian blue membrane bioelectrode | |
| CN201307086Y (en) | Intelligent turbidimeter | |
| CN105717366A (en) | Online grounding resistance monitoring alarm and remote monitoring system | |
| CN107688163A (en) | A kind of performance detection analytical equipment of user power utilization information acquisition system | |
| CN102508000B (en) | Electroencephalogram (EEG) neural signal detector impedance test and activation matching system | |
| CN202661793U (en) | Fuzzy-proportion integration differentiation (PID)-based intelligent temperature sensor | |
| CN204943794U (en) | With the air cleaning system of acquisition controller | |
| CN203274900U (en) | Dynamic on-line weighing state monitoring system | |
| CN206649008U (en) | Gas concentration measuring apparatus based on differential type collection | |
| CN206858674U (en) | A kind of aluminium electrolysis anode guide rod distributed current Detection ＆ Controling apparatus and system | |
| CN104730215A (en) | Gas detection digital bridge and detection processing method thereof | |
| CN2864627Y (en) | Control circuit for intelligent weighing sensor | |
| CN107203152A (en) | A kind of energy-saving device and economize on electricity weight testing method | |
| CN102081117B (en) | Pumping unit power hand-held test instrument and application method thereof | |
| CN102155999A (en) | Real-time wireless communication industrial thermal resistor temperature transmitter | |
| CN204925138U (en) | Automatic titration acidity analysis appearance | |
| CN203037611U (en) | On-line detection device of integrated multi-parameters for electrolyzed functional water | |
| CN206301576U (en) | A kind of compensation circuit for liquid crystal module detection voltage, detection unit and system | |
| CN205720196U (en) | Multi-parameter water quality detecting system | |
| CN113589747A (en) | Novel online water quality monitoring equipment | |
| CN202853839U (en) | Integrated type vacuum gauge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20130403 |