CN102162740B - Transmitter - Google Patents
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- CN102162740B CN102162740B CN201010586486A CN201010586486A CN102162740B CN 102162740 B CN102162740 B CN 102162740B CN 201010586486 A CN201010586486 A CN 201010586486A CN 201010586486 A CN201010586486 A CN 201010586486A CN 102162740 B CN102162740 B CN 102162740B
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Abstract
The invention discloses a transmitter, which comprises an external potentiometer, a reference power supply, a bridge circuit, a circuit, a filtering dithering elimination circuit, a voltage amplifying circuit, a zero regulation and measurement range control circuit, a voltage-to-current conversion circuit, a protection circuit, a filter circuit, a power transient inhibition and temperature compensation circuit, a power voltage stabilization and signal output circuit, and a circuit printing plate. The operation mechanism is as follows: the power supply and an acquisition card are connected with a sensor through cables; the power supply is switched on; a measurement range value is regulated to a minimum through a steel wire pull rope, so that a current output is 4.000mA; and the measurement range value is regulated to a maximum through the steel wire pull rope, so that the output current is 20.000mA. A linear displacement transmitter based on the potentiometer design is adopted by the invention, so that the resolution is limitless. Both the universality and the driving capability of the circuit are high. The shortcoming that the working performance of other transmitters is reduced due to heating is overcome and the transmitter can work under a severe environment. The system is simple and compact in structure and high in reliability. The transmitter is easy to maintain and is suitable for various complicated environments. The transmitter is also high in anti-interference performance.
Description
Technical field
The invention belongs to the surveying instrument technical field, relate to a kind of transmitter that is fit to various ranges and temperature.
Background technology
Sensor is can hard to bear specified measuring range and convert the general name of the device or the device of usable output signal to according to certain rules, is made up of sensitive element and inverting element usually.When sensor is output as the specified standard signal, then become transmitter.The kind of transmitter is a lot, and the transmitter that is used in above the industry control instrument mainly contains temperature transmitter, pressure unit, flow transmitter, current transducer, voltage transmitter or the like.
Early stage transmitter is the voltage output type mostly, is about to measuring-signal and converts the output of 0-5V voltage into, and this is that amplifier is directly exported, and signal power＜0.05W converts digital signal to through A/D conversion circuit and supplies single-chip microcomputer to read, control.But the bigger occasion of Disturbance in Power Net in signal demand long-distance transmissions or environment for use, the use of voltage output type sensor has received very big restriction, and it is relatively poor to have exposed antijamming capability, and line loss has been destroyed precision or the like shortcoming,
At present, the transmitter on the market mainly contains the rice iridium company of Germany and the serial displacement transducer of ASM company, and outward appearance is beautiful; Satisfactory mechanical property, but in actual use, find to have defective in its circuit design; Load driving is indifferent, when working than wide range, superheating phenomenon can occur for a long time; Influence measuring accuracy, reduce sensor life-time, reduce the stability and the interference free performance of sensor.
Summary of the invention
The object of the invention: be to overcome the problems and shortcomings of existence of the prior art, provide that a kind of cost performance is high, precision is high, reliability is high, the transmitter that interference resistance is strong.
Technical scheme of the present invention is: the technical scheme that realizes the foregoing invention purpose is a kind of transmitter of measuring based on mimic channel, and its technical scheme is:
A bridge circuit adopts 51 Ω resistance bridge measurement potentiometer resistances to change, and is used to draw the change in voltage increment.Reference voltage is provided by U1XTR115, and one 51 Ω resistor of serial connection plays metering function during ground connection;
Filtering twitter circuit that disappears is used for trap signal and the anti-interference that improves system, also plays and eliminates the error that the potentiometer shake brings;
A voltage amplifier circuit is used for carrying out processing and amplifying to faint variation useful signal, guarantees the accuracy of measuring;
Zero-bit is regulated and range control, is used for conditioning signal zero-bit and control range;
A voltage-to-current conversion is used for converting voltage signal into interference resistance stronger current signal, and the collection reference power circuit is provided simultaneously;
A holding circuit plays a protective role to entire circuit;
A filtering circuit is used to filter power supply and the anti-interference that improves system;
Power supply voltage stabilizing and signal output are used for stable power-supplying power supply and signal and export;
A circuit printing plate is used for carries circuit elements and line, reduces the key component of electromagnetic interference (EMI) and desensitising.
Wherein, bridge circuit by resistance R 1, R4, and potentiometer X3 form.Resistance R 1 is connected with resistance R 4, R8, capacitor C 1, inductance L 1 respectively, and resistance R 4 is connected with resistance R 1, R3, R8, capacitor C 2, inductance L 2 respectively.The 1st end of potentiometer X3 connects an end of inductance L 1, and the 3rd end of potentiometer X3 connects an end of inductance L 3, and the 2nd end of potentiometer X3 connects an end of inductance L 2.
The described filtering twitter circuit that disappears is: an end of inductance L 1, an end of capacitor C 1 are connected with an end of resistance R 1; One end of inductance L 2 is connected with an end of the other end of capacitor C 1, capacitor C 2, an end of resistance R 3, the end of R4; One end of inductance L 3 is connected with the other end of capacitor C 2, the other end of resistance R 3 is connected to the 1st pin of amplifier U2TLV2231; One end of resistance R 2 is connected to the 2nd pin of amplifier U2 TLV2231, and an end of resistance R 2 links to each other with the 3rd end of potentiometer X2 and is connected to the 3rd pin of U1 XTR115.
Described voltage amplifier circuit is: an end of resistance R 3 is connected with amplifier U2 TLV2231 the 1st end; The 2nd end of amplifier U2 TLV2231 is connected with an end of an end of capacitor C 5, capacitor C 3, an end of resistance R 2, the 3rd end of potentiometer X2, the 3rd end of U1 XTR115; The 3rd end of amplifier U2TLV2231 is connected with an end of an end of capacitor C 4, resistance R 5, an end of resistance R 6; The 4th end of amplifier U2 TLV2231 is connected with the other end of capacitor C 4, the other end of resistance R 5, the 3rd end of potentiometer X1 respectively, and the 5th end of amplifier U2 TLV2231 is connected with the other end of capacitor C 5, the 3rd end of U1 XTR115 respectively.
Described zero-bit is regulated and range control is: the 3rd end of potentiometer X1 is connected with the 4th end of amplifier U2 TLV2231, the 1st end of potentiometer X1 is connected with an end of resistance R 7, the 2nd end of potentiometer X1; The 1st end of potentiometer X2 links to each other with an end of resistance R 8, the end of R1, the end of R4 respectively, and the 3rd end of potentiometer X2 is connected with an end of U1 XTR115 the 3rd end, resistance R 2, one 2 ends of capacitor C 3, the 2nd end of amplifier U2 TLV2231 respectively.
Described voltage-to-current conversion is: U1 XTR115 the 1st end is connected with the 1st end of potentiometer X2, an end of resistance R 1, the end of R4, the end of R8, the 1st end of potentiometer X2 respectively; U1 XTR115 the 2nd end is connected with an end of resistance R 7, the other end of R8 respectively; U1 XTR115 the 3rd end is connected with the 3rd end of potentiometer X2, an end of resistance R 2, an end of capacitor C 3, the 2nd end of amplifier U2 TLV2231 respectively; The 6th end of U1 XTR115 is connected with the base stage of triode Q1; U1 XTR115 the 7th end is connected with the collector of triode Q1, the negative electrode of diode D2 respectively; U1 XTR115 the 4th end is connected with an end of inductance L 5, an end of capacitor C 6; U1XTR115 the 8th end is connected with the 5th end of amplifier U2, an end of capacitor C 5, and U1 XTR115 the 5th end is connected with the emitter of triode Q1.
Described holding circuit is: diode D2 anode is connected respectively at an end of inductance L 4, an end of capacitor C 6, and the negative electrode of D2 is connected with the collector of U1 XTR115 the 7th end, triode Q1.
Described filtering circuit is: filtering circuit is made up of inductance L 4, L5, capacitor C 6, and an end of inductance L 4 is connected with an end of capacitor C 6, the anode of diode D2 respectively, and an end of inductance L 5 is connected with the 4th end of the other end of capacitor C 6, U1 XTR115.
Described power supply voltage stabilizing and signal output are: the negative electrode of voltage stabilizing diode D1 connects the other end of inductance L 4 and the positive pole of power supply respectively, and the anode of voltage stabilizing diode D1 connects the other end of inductance L 5 and the negative pole of power supply respectively.
Described circuit printing plate is:
When the signal frequency of processing of circuit when hundreds of KHZ is above, the printed board of high speed circuit needs sandwich construction.In sandwich construction, embed metal plate (stratum, bus plane) and have the good interference mirror image effect of disappearing more.The zoning design of circuit printing plate plays an important role to reducing electromagnetic interference (EMI), according to function, device layout, power supply, reference ground subregion, numeral and mimic channel is separated, and high speed and low speed signal separate, and high power and low-power are separated.Device layout is avoided the signal long-distance transmission as far as possible.Reduce the signal loop area, lower public ground high-frequency signal coupled interference.
From the angle of signal interconnection, the choose reasonable of line style, screen layer are handled and cabling arranges it is the key that improves Electro Magnetic Compatibility.According to strong, weak, simulation, the design of digital signal characteristic packet layout.The input power-supply filter has material impact to emission, the sensitivity characteristic of system's electromagnetic interference (EMI); Select reflective low pass power-supply filter for use; Principle according to empirical data and 1.5 times power surpluses is carried out incorporate load matched, capacity and topological design to cable and power supply, with reach effective inhibition undesired signal import into attenuation factor in the purpose that spreads out of of interference.
The invention has the beneficial effects as follows: because this transducer system has adopted the displacement of the lines transmitter based on the potentiometer design, resolution can accomplish that infinitely the circuit versatility is good, and precision is high, and driving force is strong.Overcome other sensor when wide range,, can under rugged surroundings, work owing to the weakness that heating causes serviceability to reduce.The system architecture compact, reliability is high, safeguards simply, and adapt to various complex environments, antijamming capability is strong.
Description of drawings
Fig. 1 is a system chart;
Fig. 2 is circuit theory diagrams.
Specific embodiment
The following encapsulation that combines Fig. 1, Fig. 2 to specify system of the present invention annexation, circuit connecting relation and principle of work thereof, Electro Magnetic Compatibility and interference resistance design, transmitter.
Referring to Fig. 1 illustrative system annexation be successively: bridge circuit 1, filtering disappear, and twitter circuit 2, voltage amplifier circuit 3, zero-bit are regulated and range control 4, current/charge-voltage convertor 5, holding circuit 6, filtering circuit 7, power supply transient state suppressing and temperature compensation 8 and power supply voltage stabilizing and signal output 9.Wherein current/charge-voltage convertor 5 feeds back to bridge circuit 1.
Wherein the 6th end of U1XTR115 is connected with the base stage of triode Q1; 7 ends link to each other with positive source through triode Q1, diode D2, inductance L 4; 4 ends link to each other with power cathode through inductance L 5; 8 ends link to each other with the 5th end of amplifier U2TLV2231, an end of capacitor C 5, and 2 ends are connected with an end of resistance R 7, and 3 ends are system's ground wire.
High precision of the present invention, the high reliability transmitter course of work:
Transmitter is the measurement mechanism that designs according to the linear relationship of voltage or current value and displacement size according to the resistor change in resistance.One of most important measurement parameter is the degree of accuracy (or error) of overall circuit in the transmitter circuit.Working mechanism be through cable correct with power supply and capture card with on transmitter is connected; Open power supply, regulator potentiometer X2 confirms zero-bit, is regulator potentiometer X3 through steel wire tow line, and it is minimum regulating the range value, makes electric current be output as 4.000mA; Through steel wire tow line is regulator potentiometer X3, and it is maximum regulating the range value, makes electric current be output as 20.000mA; Carry out the accuracy of repetition test debugging assessment transmitter at last, the linearity, repeatability.
The implementation process of Electro Magnetic Compatibility and interference resistance: when the signal frequency of processing of circuit when hundreds of KHZ is above, the printed board of high speed circuit needs sandwich construction.In sandwich construction, embed metal plate (stratum, bus plane) and have the good interference mirror image effect of disappearing more.The zoning design of circuit printing plate plays an important role to reducing electromagnetic interference (EMI), according to function, device layout, power supply, reference ground subregion, numeral and mimic channel is separated, and high speed and low speed signal separate, and high power and low-power are separated.Device layout is avoided the signal long-distance transmission as far as possible.Reduce the signal loop area, lower public ground high-frequency signal coupled interference.
From the angle of signal interconnection, the choose reasonable of line style, screen layer are handled and cabling arranges it is the key that improves Electro Magnetic Compatibility.According to strong, weak, simulation, the design of digital signal characteristic packet layout.The input power-supply filter has material impact to emission, the sensitivity characteristic of system's electromagnetic interference (EMI); Select reflective low pass power-supply filter for use; Principle according to empirical data and 1.5 times power surpluses is carried out incorporate load matched, capacity and topological design to cable and power supply, with reach effective inhibition undesired signal import into attenuation factor in the purpose that spreads out of of interference
For the practicality of intensifier circuit, device is laid and is adopted the two sides to install respectively, the ingenious radiating element that utilizes casing as part of devices, and efficient is high, and is in light weight.Can make printed board do minimumly.
Aspect wiring, make every effort to power lead and signal live width some, pad and via hole are big.
Ground wire is handled.The quality that ground wire is handled directly influences the stability of system.In native system, shielding ground and systematically on integrated circuit board, separating.Such benefit is to reduce outside interference.
After circuit and the printed board typing, encapsulation is quite crucial, adopts printed board special isolation painting brush to be coated with integrated circuit board, drying and shaping, and the gluing device surface that is coated with of recycle silicon, and bonding with mechanical part, be fixed on the casing through cable connectors.
The annexation of transmitter circuit of the present invention is described referring to Fig. 2.
External potentiometer: the 1st end of potentiometer X3 connects an end of inductance L 1, and the 3rd end of potentiometer X3 connects an end of inductance L 3, and the 2nd end of potentiometer X3 connects an end of inductance L 2.
The filtering twitter circuit that disappears: an end of inductance L 1, an end of capacitor C 1 are connected with an end of resistance R 1; One end of inductance L 2 is connected with an end of the other end of capacitor C 1, capacitor C 2, an end of resistance R 3, the end of R4; One end of inductance L 3 is connected with the other end of capacitor C 2, the other end of resistance R 3 is connected to the 1st pin of amplifier U2 TLV2231; One end of resistance R 2 is connected to the 2nd pin of amplifier U2TLV2231, and an end of resistance R 2 links to each other with the 3rd end of potentiometer X2 and is connected to the 3rd pin of U1 XTR115.
Bridge circuit: bridge circuit by resistance R 1, R4, and potentiometer X3 form.Resistance R 1 is connected with resistance R 4, R8, capacitor C 1, inductance L 1 respectively, and resistance R 4 is connected with resistance R 1, R3, R8, capacitor C 2, inductance L 2 respectively.The 1st end of potentiometer X3 connects an end of inductance L 1, and the 3rd end of potentiometer X3 connects an end of inductance L 3, and the 2nd end of potentiometer X3 connects an end of inductance L 2.
Voltage amplifier circuit: an end of resistance R 3 is connected with amplifier U2 TLV2231 the 1st end; The 2nd end of amplifier U2TLV2231 is connected with an end of an end of capacitor C 5, capacitor C 3, an end of resistance R 2, the 3rd end of potentiometer X2, the 3rd end of U1XTR115; The 3rd end of amplifier U2 TLV2231 is connected with an end of an end of capacitor C 4, resistance R 5, an end of resistance R 6; The 4th end of amplifier U2 TLV2231 is connected with the other end of capacitor C 4, the other end of resistance R 5, the 3rd end of potentiometer X1 respectively, and the 5th end of amplifier U2 TLV2231 is connected with the other end of capacitor C 5, the 3rd end of U1 XTR115 respectively.
Zero-bit is regulated and range control: the 3rd end of potentiometer X1 is connected with the 4th end of amplifier U2 TLV2231, the 1st end of potentiometer X1 is connected with an end of resistance R 7, the 2nd end of potentiometer X1; The 1st end of potentiometer X2 links to each other with an end of resistance R 8, the end of R1, the end of R4 respectively, and the 3rd end of potentiometer X2 is connected with an end of U1 XTR115 the 3rd end, resistance R 2, one 2 ends of capacitor C 3, the 2nd end of amplifier U2 TLV2231 respectively.
A voltage-to-current conversion: U1 XTR115 the 1st end is connected with the 1st end of potentiometer X2, an end of resistance R 1, the end of R4, the end of R8, the 1st end of potentiometer X2 respectively; U1 XTR115 the 2nd end is connected with an end of resistance R 7, the other end of R8 respectively; U1 XTR115 the 3rd end is connected with the 3rd end of potentiometer X2, an end of resistance R 2, an end of capacitor C 3, the 2nd end of amplifier U2 TLV2231 respectively; The 6th end of U1 XTR115 is connected with the base stage of triode Q1; U1 XTR115 the 7th end is connected with the collector of triode Q1, the negative electrode of diode D2 respectively; U1 XTR115 the 4th end is connected with an end of inductance L 5, an end of capacitor C 6, and U1 XTR115 the 8th end is connected with the 5th end of amplifier U2, an end of capacitor C 5, and U1 XTR115 the 5th end is connected with the emitter of triode Q1.
A holding circuit: diode D2 anode is connected respectively at an end of inductance L 4, an end of capacitor C 6, and the negative electrode of D2 is connected with the collector of U1 XTR115 the 7th end, triode Q1.
Filtering circuit: filtering circuit is made up of inductance L 4, L5, capacitor C 6, and an end of inductance L 4 is connected with an end of capacitor C 6, the anode of diode D2 respectively, and an end of inductance L 5 is connected with the 4th end of the other end of capacitor C 6, U1 XTR115.
Power supply voltage stabilizing and signal output: the negative electrode of voltage stabilizing diode D1 connects the other end of inductance L 4 and the positive pole of power supply respectively, and the anode of voltage stabilizing diode D1 connects the other end of inductance L 5 and the negative pole of power supply respectively.
Claims (1)
1. transmitter; Comprise external potentiometer, reference power supply, bridge circuit (1), filtering and the twitter circuit that disappears (2), voltage amplifier circuit (3), zero-bit adjusting and range control circuit (4), voltage-current converter circuit (5), holding circuit (6), LC filtering circuit (7), power supply transient state suppressing and temperature-compensation circuit (8), power supply stabilization circuit and signal output apparatus (9), circuit printing plate (10); It is characterized in that, comprising:
A bridge circuit (1) adopts 51 Ω resistance bridge measurement potentiometer resistances to change, and reference voltage is provided by U1 XTR115, one 51 Ω resistor of serial connection during ground connection;
Filtering and the twitter circuit that disappears (2);
A voltage amplifier circuit (3);
A zero-bit is regulated and range control circuit (4);
A voltage-current converter circuit (5);
A holding circuit (6);
A LC filtering circuit (7);
Power supply transient state suppressing and temperature-compensation circuit (8);
Power supply stabilization circuit and signal output apparatus (9);
One is used for carries circuit elements and line, reduces the circuit printing plate (10) of electromagnetic interference (EMI) and desensitising;
Described voltage amplifier circuit (3) is: the 1st end of resistance R 3 is connected with amplifier U2 TLV2231 the 1st end; The 2nd end of amplifier U2 TLV2231 is connected with the 2nd end of the 1st end of capacitor C 5, capacitor C 3, the 2nd end of resistance R 2, the 3rd end of potentiometer X2, the 3rd end of U1 XTR115; The 3rd end of amplifier U2 TLV2231 is connected with an end of an end of capacitor C 4, resistance R 5, an end of resistance R 6; The output terminal 4 of amplifier U2 TLV2231 is connected with the other end of capacitor C 4, the other end of resistance R 5, the 3rd end of potentiometer X1 respectively; The 5th end of amplifier U2 TLV2231 is connected with the 2nd end of capacitor C 5, the 3rd end of U1 XTR115 respectively, and the 5th end of amplifier U2 TLV2231 is connected with an end, resistance R 1, R4, the R8 of capacitor C 5 respectively;
Described voltage-current converter circuit (5) is: U1 XTR115 the 1st end is connected with the 1st end of potentiometer X2, the 2nd end of resistance R 1, the 2nd end of R4, the end of R8, the 1st end of potentiometer X2 respectively; U1 XTR115 the 2nd end is connected with the other end of resistance R 7, R8 respectively; U1 XTR115 the 3rd end is connected with the 3rd end of potentiometer X2, the 2nd end of resistance R 2, an end of capacitor C 3, the 2nd end of amplifier U2 TLV2231 respectively; The output terminal 6 of U1 XTR115 is connected with the base stage of triode Q1; U1 XTR115 the 7th end is connected with the collector of triode Q1, the negative electrode of diode D2 respectively; U1 XTR115 the 4th end is connected with an end of inductance L 5, capacitor C 6; U1 XTR115 the 8th end is connected with the 5th end of amplifier U2, the 2nd end of capacitor C 5, and U1 XTR115 the 5th end is connected with the emitter of triode Q1;
The annexation of built-up circuit is successively: bridge circuit (1), filtering and the twitter circuit that disappears (2), voltage amplifier circuit (3), zero-bit are regulated and range control circuit (4), current/charge-voltage convertor (5), holding circuit (6), LC filtering circuit (7), power supply transient state suppressing and temperature-compensation circuit (8) and power supply stabilization circuit and signal output apparatus (9), and wherein current/charge-voltage convertor (5) feeds back to bridge circuit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010586486A CN102162740B (en) | 2010-12-14 | 2010-12-14 | Transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010586486A CN102162740B (en) | 2010-12-14 | 2010-12-14 | Transmitter |
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| Publication Number | Publication Date |
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| CN102162740A CN102162740A (en) | 2011-08-24 |
| CN102162740B true CN102162740B (en) | 2012-10-10 |
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| CN201010586486A Active CN102162740B (en) | 2010-12-14 | 2010-12-14 | Transmitter |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735362B (en) * | 2012-06-20 | 2014-04-02 | 北京遥测技术研究所 | Astronautic programmable thermocouple temperature transmitter |
| CN103017798A (en) * | 2012-12-14 | 2013-04-03 | 烟台荏原空调设备有限公司 | Resistance transmitter |
| CN106353600A (en) * | 2015-07-13 | 2017-01-25 | 北京谊安医疗系统股份有限公司 | Resistance detection circuit of potentiometer for anesthesia apparatus motor valve positioning |
| CN105138147A (en) * | 2015-08-26 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Wireless mouse control device based on jitter eliminating circuit |
| CN114062867A (en) * | 2021-11-15 | 2022-02-18 | 国网浙江省电力有限公司电力科学研究院 | Sensor data processing module and transformer substation distributed monitoring system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2182994Y (en) * | 1993-08-30 | 1994-11-16 | 陈权孝 | High output type sensor for pressure |
| US5684407A (en) * | 1991-01-29 | 1997-11-04 | Cts Corporation | Electronic circuit packaged with a position sensor |
| US6053050A (en) * | 1996-10-03 | 2000-04-25 | Mcdonnell Douglas Corporation | Signal conditioning system |
| CN1274075A (en) * | 2000-04-24 | 2000-11-22 | 谭维克 | Multi-signal processing circuit, compund sensor and following detector thereof |
| CN201555597U (en) * | 2009-12-10 | 2010-08-18 | 株洲振邦科技实业有限公司 | Multifunctional transducer |
-
2010
- 2010-12-14 CN CN201010586486A patent/CN102162740B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5684407A (en) * | 1991-01-29 | 1997-11-04 | Cts Corporation | Electronic circuit packaged with a position sensor |
| CN2182994Y (en) * | 1993-08-30 | 1994-11-16 | 陈权孝 | High output type sensor for pressure |
| US6053050A (en) * | 1996-10-03 | 2000-04-25 | Mcdonnell Douglas Corporation | Signal conditioning system |
| CN1274075A (en) * | 2000-04-24 | 2000-11-22 | 谭维克 | Multi-signal processing circuit, compund sensor and following detector thereof |
| CN201555597U (en) * | 2009-12-10 | 2010-08-18 | 株洲振邦科技实业有限公司 | Multifunctional transducer |
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| CN102162740A (en) | 2011-08-24 |
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