CN103308102A - Wireless transmission method of turbine flow sensor pulse signals - Google Patents

Abstract

The invention relates to a wireless transmission method of turbine flow sensor pulse signals, which comprises the following steps: the turbine flow sensor coil inducts a magnetic flux alternating signal, produces an alternating electric impulse signal, goes through a pre-amplification electric circuit, carries out optical coupling isolation and wave filtration through a pulse signal processing circuit, inputs the signal into a transmitting terminal 51 series singlechip T/C port to count the pulse, and sends the frequency information to a ZigBee wireless data transmission module to be sent out; the ZigBee module of a receiving terminal receives the frequency and sends the frequency to the singlechip of the receiving terminal to be processed; the pulse signal is restored through a data processing circuit after the processing; the receiving terminal processing signal replaces the original wiring from the sensor to a meter, and overcomes the insufficiency of high cost of wiring maintenance; the system can still use an integrating header and a working manner of an original turbine flowmeter, and is strong in universality; and meanwhile the receiving terminal is provided with a UART (Universal Asynchronous Receiver Transmitter) serial interface which is easy to be enlarged to a RS232 (Recommend Standard 232) or RS485 (Recommend Standard 485) interface, and can be directly switched in digital systems such as a computer.

Description

A kind of turbine flow transducer pulse signal radio transmitting method

Technical field

The present invention relates to a kind of signal transmission technology, particularly a kind of turbine flow transducer pulse signal radio transmitting method.

Background technology

Turbine flow transducer is used for measurement of fluid flow, is comprised of impeller, magnet steel coil, prime amplifier etc.The flow measurement mechanism of turbine flow transducer is at present: turbine flow transducer is installed in the pipeline of measured flux, and the fluid that flows makes vane rotary; The magnet steel coil produces magnetic field, and the vane rotary cutting magnetic line, like this, the variation of the magnetic flux generating period of coil, thereby produce the alternation induced potential, be electric impulse signal, the electric impulse signal of this output is through prime amplifier amplification, shaping, and producing has rectangular wave pulse signal certain amplitude, continuous.Pulse signal reaches Displaying Meter again, as calculated, shows instantaneous delivery and the integrated flux of detected fluid.

Displaying Meter obtains the detected fluid flow according to the pulse signal of prime amplifier output.Generally speaking, turbo flow meter is by two kinds of structures, and a kind of is integral structure, i.e. sensor and demonstration (integrating) gauge outfit is the structure of integral type; Another kind is split-type structural, and namely sensor and demonstration (integrating) gauge outfit are installed in respectively different locally, are connected with cable between sensor and demonstration (integrating) gauge outfit.In many application scenarios, sensor location is wider, and shows that (integrating) instrument often requires to install concentratedly in instrument cubicle (or in pulpit), and sensor and demonstration (integrating) gauge outfit standoff distance is far away, like this, wiring and maintenance cost are higher, also easily are struck by lightning.

Summary of the invention

The present invention be directed to turbine flow transducer and test satellite location distance is subject to physical restriction and has to use long signal cable, wiring and the higher problem of maintenance cost, a kind of turbine flow transducer pulse signal radio transmitting method has been proposed, solved wiring, maintenance cost is high, easy thunderstruck deficiency.

Technical scheme of the present invention is: a kind of turbine flow transducer pulse signal radio transmitting method specifically comprises the steps:

1) transmitting terminal gathers transmitted signal: turbine flow transducer is coil-induced to go out the magnetic flux alternating signal, produce the alternation induced potential, it is electric impulse signal, behind pre-amplification circuit, after carrying out light-coupled isolation, filtering by the pulse signal treatment circuit again, be input to transmitting terminal end 51 series monolithic T/C mouths, carry out pulse collection, pulse is counted, and again frequency information is sent to the ZigBee wireless data transfer module by the UART mouth;

2) receiving end receives signal: after the ZigBee module of receiving end is received frequency information, be sent to the UART mouth of 51 series monolithics of receiving end;

3) receiving end processing signals: 51 series monolithics of receiving end carry out segmentation with the frequency that receives, if frequency is 0Hz, and output low level always then, frequency is between the 1-9Hz, so frequency be multiply by 100, frequency is between the 10-99Hz, so frequency be multiply by 10 and processes; Frequency after the staging treating be multiply by 2, the inverse of getting again frequency obtains the semiperiod (HT), with the appointment timing time of semiperiod (HT) as timer, as break period, obtain the initial value of clock counter by given formula, then initial value is assigned to counter, counter calculates interruption times, and interruption times is sent into data processing circuit reduction pulse signal;

4) after the pulse that once receives on receiving, when still not having new frequency values, then reception is in waiting status, and receiving end will send the frequency that the last time receives, until there is new data receiver to arrive next time; If waiting status surpasses setting-up time, just think transmitting terminal fault or off-line, receiving end stops to send pulse.

Beneficial effect of the present invention is: turbine flow transducer pulse signal radio transmitting method of the present invention, replaced the originally wiring of (gauge outfit, computing machine etc.) from the sensor to the instrument, wiring, the deficiency that maintenance cost is high have been overcome when sensor and instrument (integrating gauge outfit, computing machine etc.) are distant; System can not change integrating gauge outfit and the working method of original turbo flow meter, highly versatile; Because receiving end possesses the UART serial line interface simultaneously, can expand at an easy rate RS232 or RS485 interface, so system can access the digital display circuits such as computing machine easily.

Description of drawings

Fig. 1 is turbine flow transducer pulse signal wireless transmission system architecture schematic diagram of the present invention;

Fig. 2 is turbine flow transducer pulse signal wireless transmitting system transmitting terminal single-chip microcomputer main program flow chart of the present invention;

Fig. 3 is turbine flow transducer pulse signal wireless transmitting system receiving end single-chip microcomputer main program flow chart of the present invention.

Embodiment

Turbine flow transducer pulse signal wireless transmission system architecture schematic diagram as shown in Figure 1, system comprises transmitting terminal 1 and receiving end 8.Transmitting terminal comprises pulse signal treatment circuit 2, transmitting terminal 51 series monolithics 3, ZigBee wireless data transfer module 4.Cell winding induces the magnetic flux alternating signal, produce the alternation induced potential, it is electric impulse signal, behind shaping, pre-amplification circuit, sent into transmitting terminal 51 series monolithics 3 by pulse signal treatment circuit 2 acquisition process, counted by transmitting terminal 51 series monolithics 3 paired pulses, and pass through the UART mouth of single-chip microcomputer 3, frequency information is sent to ZigBee wireless data transfer module 4; The ZigBee module 5 of receiving end is sent to receiving end 51 series monolithics 6 after receiving frequency information, with the signal that receives, pass through signal processing circuit 7 after as calculated by single-chip microcomputer again, is reduced into the pulse output identical with the original pulse frequency.Receiving end possesses UART serial line interface 9 simultaneously, can expand at an easy rate RS232 or RS485 interface, provides convenience for directly accessing the digital display circuits such as computing machine.

A kind of based on 51 series monolithics+ZigBee, perhaps the turbine flow transducer flow pulse information wireless transmission plan of other communication medias comprises the steps:

1) transmitting terminal gathers transmitted signal: turbine flow transducer is coil-induced to go out the magnetic flux alternating signal, produce the alternation induced potential, it is electric impulse signal, behind pre-amplification circuit, after carrying out light-coupled isolation, filtering by the pulse signal treatment circuit again, be input to transmitting terminal end 51 series monolithic T/C mouths, carry out pulse collection, pulse is counted, and then frequency information is sent to the ZigBee wireless data transfer module by the UART mouth;

2) receiving end receives signal: after the ZigBee module of receiving end is received frequency information, be sent to the UART mouth of 51 series monolithics of receiving end;

3) receiving end processing signals: 51 series monolithics of receiving end carry out segmentation with the frequency that receives, if frequency is 0Hz, and output low level always then, frequency is between the 1-9Hz, so frequency be multiply by 100; Frequency is between the 10-99Hz, so frequency be multiply by 10 and processes; Frequency after the staging treating be multiply by 2, and the inverse of getting again frequency obtains the semiperiod (HT), with the appointment timing time of semiperiod (HT) as timer, as break period; Obtain the initial value of clock counter by given formula, then initial value is assigned to counter, counter calculates interruption times, and interruption times is sent into data processing circuit reduction pulse signal;

4) after the pulse that receiving end once receives on receiving, when still not having new frequency values, then reception is in waiting status, and receiving end will send the frequency that the last time receives, until there is new data receiver to arrive next time; If waiting status surpasses setting-up time, just think transmitting terminal fault or off-line, receiving end stops to send pulse.

Be the program flow diagram of transmitting terminal 51 series monolithics such as Fig. 2, described master routine comprises the method for using as shown in Figure 2 accumulation, every 1000ms the umber of pulse that is accumulated to is sent to receiving end, allows it produce pulse.

Be receiving end 51 series monolithic main program flow charts of the present invention such as Fig. 3.12 for interrupting processing among the figure, and 13 is that frequency segmentation is processed, and 14 is that output is processed.Described master routine comprises that the receiving end single-chip microcomputer carries out segmentation with the frequency that receives, that is: 0Hz, and 1-9Hz, 10-99Hz is more than the 100Hz.If frequency is 0Hz, output low level always then; For example frequency is between the 1-9Hz, so frequency be multiply by 100, processes again.Frequency is carried out staging treating, can improve reception of impulse end pulse output accuracy.The frequency values (f) of receiving end by receiving multiply by 2, obtains the number of times that pulse output I/O mouth needs negate.The inverse of getting frequency obtains the cycle (T), then obtains the semiperiod (HT), with the appointment timing time of HT as timer, obtains the initial value of clock counter by given formula, then initial value is assigned to counter.Such as the frequency of 1Hz, then clock produces interruption with the semiperiod of 100Hz, and namely every 5ms produces once and interrupts.And the semiperiod of 1Hz is 500ms, so only needs needing to obtain the interruption number of wait, and namely pulsewidth (when being low level or high level) waits for that number (PWMCnt) changes to 100 and gets final product.In like manner can process the input pulse of 10-99Hz.Like this, output I/O port is namely by incoming frequency value transmission (dutycycle be 50%) pulse.

On this basis, if after the last end-of-pulsing, still do not have new frequency values, receiving end will send the frequency that the last time receives, until there is new data receiver to arrive next time; If but can arrange at 20s() also do not receive afterwards new data, just think so transmitting terminal fault or off-line, receiving end stops to send pulse.

Claims (1)

1. a turbine flow transducer pulse signal radio transmitting method is characterized in that, specifically comprises the steps:

1) transmitting terminal gathers transmitted signal: turbine flow transducer is coil-induced to go out the magnetic flux alternating signal, produce the alternation induced potential, it is electric impulse signal, behind pre-amplification circuit, after carrying out light-coupled isolation, filtering by the pulse signal treatment circuit again, be input to transmitting terminal end 51 series monolithic T/C mouths, carry out pulse collection, pulse is counted, and then frequency information is sent to the ZigBee wireless data transfer module by the UART mouth;

2) receiving end receives signal: after the ZigBee module of receiving end is received frequency information, be sent to the UART mouth of 51 series monolithics of receiving end;

3) receiving end processing signals: 51 series monolithics of receiving end carry out segmentation with the frequency that receives, if frequency is 0Hz, and output low level always then, frequency is between the 1-9Hz, so frequency be multiply by 100; Frequency is between the 10-99Hz, so frequency be multiply by 10 and processes; Frequency after the staging treating be multiply by 2, and the inverse of getting again frequency obtains the semiperiod (HT), with the appointment timing time of semiperiod (HT) as timer, as break period; Obtain the initial value of clock counter by given formula, then initial value is assigned to counter, counter calculates interruption times, and interruption times is sent into data processing circuit reduction pulse signal;

4) after the pulse that receiving end once receives on receiving, when still not having new frequency values, then reception is in waiting status, and receiving end will send the frequency that the last time receives, until there is new data receiver to arrive next time; If waiting status surpasses setting-up time, just think transmitting terminal fault or off-line, receiving end stops to send pulse.

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