CN1058786C - Photoelectric transmission rotary body multichannel measuring system - Google Patents
Photoelectric transmission rotary body multichannel measuring system Download PDFInfo
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- CN1058786C CN1058786C CN94104533A CN94104533A CN1058786C CN 1058786 C CN1058786 C CN 1058786C CN 94104533 A CN94104533 A CN 94104533A CN 94104533 A CN94104533 A CN 94104533A CN 1058786 C CN1058786 C CN 1058786C
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Abstract
The present invention relates to a multichannel measuring system of a photoelectric transmission rotary body, which is composed of rotary components and stationary components, wherein the rotary components are installed on the rotary body, and the stationary components are installed outside the rotary body; the rotary parts comprise a sensitive element, a miniature data collection system, a photoelectric transmission component and an electric source; the stationary components comprise a system electric supplying electric source, a light transmission device, a buffer circuit, an interface circuit, a host computer, a printer and a displayer. The working process comprises: the light transmission device is driven after a collected signal of the sensitive element is amplified, shaped and treated by the miniature data collection system; the signal of the sensitive element is received by the light transmission device in the stationary components, buffered, interfaced, loaded into the host computer and treated. The signal is printed by the printer or displayed and output after being treated.
Description
The present invention is a kind of photoelectric transmission rotary body multichannel measuring system, belongs to electronic technology field.
Measure at present some physical quantity on the rotary body such as strain, temperature, pressure etc., measured again after all adopting slip ring (electrical feedthrough) that the signal on the rotary body is caused stationary part.But because electrical feedthrough is directly connected with measuring sensitive element, electrical feedthrough contact resistance, contact electricity, internal lead resistance all can change in rotary course, and these variations can't be distinguished mutually with the normal output of sensitive element, and the result will cause error.The useful signal of sensitive element output simultaneously is very small usually, and when rotary body was made high speed rotating, situation further worsened, and electrical feedthrough will produce bigger error, the precision that influence is measured.In considerable time, people have made a large amount of research-and-development activitys to electrical feedthrough, in the hope of further improving the performance of electrical feedthrough, wherein the mercury electrical feedthrough is the outstanding person, through Precision Machining and careful the processing, its index is leading in all electrical feedthroughs, but mercury pollution forces it progressively to withdraw from use.Other electrical feedthroughs are the solid sliding ring type, although a large amount of work has been done by relevant units at home and abroad, are not still having breakthrough aspect main electric index and life-span, and cost an arm and a leg (external price is usually at thousands of dollars).Like this, electrical feedthrough has become to influence the combined symptoms that rotary body is measured, retired along with the mercury electrical feedthrough, and it is more severe that situation becomes.
In this case, people forward notice on the non-contact measurement to, and a kind of method of similar remote measurement forms gradually, and it utilizes the transmission of electric wave, and the output signal of sensitive element is passed to stationary part, finish measurement through signal and data processing.Because the theory and the method comparative maturity of remote measurement add the development of components and parts such as integrated circuit, this method a kind of promising measurement means of can yet be regarded as.But when using on rotary body, the object of high speed rotating especially is owing to adopt the induction mode power supply, voltage changes with change in rotational speed, and disturb, adopt its power supply mode of the method need take the bigger useful space simultaneously, make this method fail to be used widely.
In view of the weakness and the limitation that exist in existing the measurement, the objective of the invention is to design a kind of measuring accuracy height, speed is fast, good reliability, and automaticity height, pollution-free and power supply power mode do not take the photoelectric transmission rotary body multichannel measuring system of the useful space.
The present invention is a kind of photoelectric transmission rotary body multichannel measuring system, this system mainly include be installed in parts on the revolving part in the rotary body claim rotary part (111) and be installed in the rotary body parts on non-rotating and the outer parts of rotary body claim stationary parts (112) two partly and system software form;
Rotary part (111) includes sensitive element (1), miniature data acquisition system (DAS) (211), optical communication means (212), power supply (213), this rotary part (111) removes sensitive element (1) and is installed on any measured point of tested revolving part, remaining parts welds or is installed on the printed circuit board (PCB), printed circuit board (PCB) is seated in the cylindrical housings, and the hollow that this cylindrical housings is installed in rotary shell (214) is partly in the space of (215); Include in the miniature data acquisition system (DAS) (211) in rotation part (111): analog switch (2), biasing circuit (3), amplifier (4), A/D converter (5) and single-chip microcomputer (6); In optical communication means (212), include: light drive circuit (7) and optical transmission apparatus (8); In power supply (213), include; Rotary part conductive bearing (10) on power circuit (9) and the rotary body, (10 '), conductive bearing (10), (10 ') conduction power supply by this;
The annexation of this rotary part is: the sensitive element (1) in the rotary part (111) can be installed on the tested revolving part as required, its output terminal connects the analog switch (2) in the miniature data acquisition system (DAS) (211), the output terminal of analog switch (2) connects the input end of biasing circuit (3), the output terminal of biasing circuit (3) connects the input end of amplifier (4), the output terminal of amplifier (4) connects the input end of A/D transducer (5), the output terminal of A/D transducer (5) connects single-chip microcomputer (6), the output of single-chip microcomputer (6) connects the input end of the light drive circuit (7) in the optical communication means (212), and the output terminal of light drive circuit (7) connects optical transmission apparatus (8).By power circuit (9) is rotary part (111) power supply.
Stationary parts (112) includes system's power supply (11), optical transmission apparatus (12), buffer circuit (13), interface circuit (14), principal computer (15), printer (16) and display (17), wherein be installed in non-rotating locating shaft (216) in the rotary body go up except that optical transmission apparatus (12), remaining all is seated in outside the solid of revolution;
The annexation of this stationary parts is: the optical transmission apparatus (12) in the stationary parts (112) connects buffer circuit (13), the input end of the output terminal connecting interface circuit (14) of buffer circuit (13), the output terminal of interface circuit (14) connects principal computer (15), principal computer (15) connects printer (16), display (17) simultaneously, and system's power supply (11) is the present invention's power supply.
The master routine software of native system is partly formed by three altogether:
A. the software of single-chip microcomputer in the rotary part; B. the software of single-chip microcomputer in the interface board for computers;
C. the software of principal computer; Wherein,
The software of single-chip microcomputer mainly is in this rotary part: the data acquisition system (DAS) work in the drive controlling rotary part, comprise initialization, start timer, start A/D converter work, and the data behind the A/D coding are sent to the photoelectricity transmission parts with the form of serial code single-chip microcomputer;
The software of single-chip microcomputer mainly is in this interface board for computers: control receives the serial code that rotary body is sent, string---and change, and send principal computer with data;
The software of this principal computer mainly is: the data of A/D converter are read in control, and according to user's needs with data presentation, printing, deposit.
Sensitive element (1) in the rotary part (111) can be that strainometer or thermal resistance RTD1, RtD2......RTDn, thermopair T1, T2.......Tn are used for measuring temperature according to measuring needs, can be that bridge-type pressure or load transducer P1, P2......Pn are used for measuring pressure (pressure) or load, the excitation power supply of sensitive element is provided by power circuit (9), and connected mode adopts connection method altogether.
Biasing circuit (3) in the miniature data acquisition system (DAS) (211) is that the difference according to the sensitive element (1) that uses determines its connected mode, when the sensitive element (1) that uses was strainometer or thermal resistance RTD1, RTD2......RTDn, its circuit connecting form was; Power supply connects an end of resistance R 1, the end of the other end serial connection pot VR of resistance R 1, the end of the other end series resistor R2 of pot VR, the other end ground connection of resistance R 2, the intermediate point of pot VR connects high-end (+) of amplifier (4), and the output terminal of analog switch (2) connects the low side (-) of amplifier (4); When sensitive element (1) use be thermopair T1, T2......Tn or bridge pressure sensor P1, P2......Pn the time, then do not need biasing circuit (3), adopt analog switch (2) directly to connect amplifier (4).
The connected mode of the light drive circuit (7) in the optical communication means (212) is: capacitor C 1 is with resistance R 1 and connect the base stage that back one end is connected single-chip microcomputer (6) other end connection triode Q1, the grounded emitter of triode Q1, the collector of triode Q1 connects the 5V power supply by resistance R 2, resistance R 2 is connected the positive pole of optical transmission apparatus (8), the minus earth of optical transmission apparatus (8) with the common port of triode Q1.The transmission of light signal can be the one-way transmission mode that a side sends, a side receives, and also can be the transmitted in both directions mode that two sides all can receive, send.
Power circuit (9) in the power supply (213) adopts three- terminal regulator block 7806,7805,78XX, 7906 to provide ± reference power supply (excitation power supply (XXV) of VREF and sensitive element (1) of 6V, 5V, A/D converter.The course of work of rotary part (111) is: the signal by each sensitive element (1) output is sent into amplifier (4) through analog switch (2) in turn through biasing circuit (3), signal is sent into A/D converter (5) after amplifier amplifies, A/D converter (5) converts analog quantity to and sends into single-chip microcomputer (6) behind the digital quantity and handle, and the signal after single-chip microcomputer (6) is handled drives optical transmission apparatus (8) through light drive circuit (7).Power supply (213) can provide three to five groups of power supplys for rotary part (111) by power circuit (9), wherein ± 6V provides the mimic channel power supply, + 5V provides the digital circuit power supply, these three groups of power supplys have, whether the external reference power supply of needs is determined magnitude of voltage to the 4th group of power supply according to the A/D converter of selecting for use, the 5th group of power supply is the excitation power supply of sensitive element (1) during for sensor, its magnitude of voltage is set as required, when being thermopair, sensitive element (1) do not need this power supply, by system's power supply (11) send here ± 9V and common port, by conductive bearing (10), (10 ') is power circuit (9) power supply, power circuit (9) is rotary part (111) power supply, and system's power supply (11) is also for being installed in optical transmission apparatus (12) and buffer circuit (13) power supply on the locating shaft (216).
The connected mode of the buffer circuit (13) in the stationary parts (112) is: resistance R 1, R2, R4, the end of R6 connects+the 5V power supply after linking to each other, the other end of resistance R 1 connects the negative pole of optical transmission apparatus (12), the positive pole of optical transmission apparatus (12) connects the base stage of triode Q1, the collector of triode Q1 connects the other end of resistance R 2, also connect resistance R 3 and capacitor C 1 end in parallel simultaneously, resistance R 3 is connected the base stage of triode Q2 with the other end of capacitor C 1 parallel connection, the collector of triode Q2 connects the other end of resistance R 4, also connect resistance R 5 and capacitor C 2 end after in parallel simultaneously, resistance R 5 is connected the base stage of triode Q3 with the other end after capacitor C 2 parallel connections, the collector of triode Q3 connects the other end of resistance R 6, triode Q1, Q2, the emitter of Q3 is ground connection simultaneously.
Interface circuit (14) in the stationary parts (112) partly is made up of intelligent front end (141) and computer interface circuit (142) two, signal from buffer circuit (13) output at first send intelligent front end (141), send computer interface circuit (142) then, machine interface circuit (142) is sent into principal computer (15) as calculated.
The course of work of stationary parts (112) is: the optical transmission apparatus (8) in optical transmission apparatus (12) in the stationary parts (112) and the rotary part (111) responds to and cooperate with each other across a great distance, its radiative optical transmission apparatus (8) can adopt light emitting diode or semiconductor laser, the optical transmission apparatus of receiving optical signals (12) can adopt photodiode according to transfer rate, phototriode, sensitive element such as light resistance or photoelectric cell, after the next light signal of optical transmission apparatus (8) emission is received by optical transmission apparatus (12), this optical transmission apparatus (12) is sent to the light signal that receives in the impact damper (13) and carries out shaping, signal after the shaping send interface circuit (14), signal interface circuit (14) is sent into principal computer (15), after principal computer (15) is handled, consequential signal is outputed to printer (16) print or output to display (17) demonstration.
Advantage of the present invention and unique distinction are:
1. utilize light as transmission medium, the principle that one axle center is all arranged according to any rotary body, at its place, axle center the photoelectricity transmission device is installed, another photoelectricity transmission device is installed on relative non-rotating in rotary body axle center, then can carry out the transmission of light signal, comprise that a side receives the one-way transmission mode of the opposing party's transmission and the transmitted in both directions mode that two sides all can receive and send.
2. the cancellation electrical feedthrough will intactly be installed in the little space by monolithic processor controlled a complete set of data acquisition system (DAS), finishes data acquisition on rotary body, by light---and electrical transmission is transmitted signal, has reduced error greatly.
3. utilize bearing to power to rotary part, electric current can reach 0.5A, and does not take the useful space, does not produce interference, can satisfy measurement requirement.
4. native system is pollution-free, measuring speed is fast, precision is high, good reliability, automaticity height, long service life, ratio of performance to price height.
The present invention has following accompanying drawing: Fig. 1. the total theory diagram of photoelectric transmission rotary body multichannel measuring system.Fig. 2 a.b.c. sensitive element and connection thereof.Fig. 3 a.b.c. biasing circuit figure.Fig. 4. light emission and driving circuit figure thereof.Fig. 5. rotation power circuit partly.Fig. 6. light-receiving and buffer circuit thereof.Fig. 7. intelligent front end and computer interface circuit block diagram.Fig. 8. the computer interface circuit theory diagrams.Fig. 9. main program flow chart.Figure 10. the rotation body structure synoptic diagram.Figure 11. bearing synoptic diagram Figure 12. the positioning seat synoptic diagram.Figure 13. the software flow pattern of single-chip microcomputer in the rotary part.Figure 14. the software flow pattern of single-chip microcomputer in the interface board for computers.Number in the figure is as follows: 1. sensitive element (thermal resistance. strainometer: RTD1～RTDn, thermopair: T1～Tn,
Bridge pressure sensor. 2. analog switches, 3. biasing circuits of load transducer: P1～Pn) (resistance: R1.R2 potentiometer: VR) 4. amplifier 5.A/D converters (analog-digital converter) 6. single-chip microcomputer (CPU) 7. light drive circuit (resistance: R1.R2 triode: Q1 electric capacity: C1) 8. optical transmission apparatus, 9. power circuits (three-terminal regulator block: 7805.7806.78XX.7906) 10. 10 ' conductive bearing 11. system power supply power supplys 12. optical transmission apparatus 13. buffer circuits (resistance: R1～R6 electric capacity: 14. interface circuits, 15. master computers, 16. printers, 17. displays, 111. rotary parts, 112. stationary parts, 141. intelligent front ends, 142. Computer interface circuits, 211. miniature data collecting system 212. transmission parts 213. power supplys 214. rotary shells 215. hollows part 216. locating shafts 217. positioning seats 218. bearings of C1.C2 triode: Q1～Q3)
Introduce each several part below in conjunction with accompanying drawing:
Sensitive element (1): this physical quantity that is the user measures is as requested selected voluntarily, and strainometer is arranged usually---survey strain or stress; Thermoelectricity is thermal resistance occasionally---the thermometric degree; Pressure transducer---measuring pressure (pressure); Power or load transducer---dynamometry or load.This part is installed on the tested rotary body, its position is determined as required by the user, by it measurand is transformed into electric signal, send into miniature data acquisition system (DAS) (211), its connected mode adopts connection altogether, wherein Fig. 2 a is strainometer or thermal resistance, and Fig. 2 b is a thermopair, and Fig. 2 c is bridge-type pressure, power or load transducer.
Analog switch (2): the present invention is a multichannel measuring system, and it has a plurality of input channels.The output of each sensitive element (1) or sensor is sent into amplifier (4) in turn through analog switch (2).The model of analog switch (2) is: CD4051 or CD4052 or CD4067, according to the quantity of sensitive element (1) or sensor and the space and the size decision of pattern and rotary part, when adopting bridge type magnetic sensor, because two output terminals are arranged, select CD4052 for use, other are then with CD4051 or CD4067.
Biasing circuit (3): according to the sensitive element difference, adopt three kinds of dissimilar biasings, Fig. 3 a is the assorted or thermal resistance pattern of strain, and Fig. 3 b is the thermopair pattern, and Fig. 3 c is various bridge type magnetic sensor patterns.
Amplifier (4): the instrumentation amplifier of any pattern all can, can select suitable gain according to the sensitivity of used sensitive element (1) and the size of measurand, select the suitable amplifier of dynamic perfromance according to acquisition rate, and consider noise, drift etc. with the entire system index.
A/D converter (5): can as requested precision and acquisition rate select, usually select 8bt, 10bt or 12bt for use, can select between 1 μ s to 30 μ s switching time, need explanation a bit, inappropriate high target is to make cost with the price of costliness, will be above more than 100 times of 20 μ s 8bt A/D converters as the price of 1 μ s 12bat A/D converter.
Single-chip microcomputer (6): adopt 51 and 96 series monolithics.
Light drive circuit (7) and optical transmission apparatus (8): because of the output of CPU does not have driving force, so need driving circuit that power is provided, light drive circuit (7) is decided with optical transmission apparatus (8) is different, and the driving circuit of light emitting diode and semiconductor laser has difference.Fig. 4 is arsenic carbon light emitting diode and driving circuit thereof.
Power circuit (9): rotating part has three to five groups of power supplys, wherein ± 6V (mimic channel power supply) and+three groups of 5V (digital circuit power supply) are for total, according to the A/D converter of selecting for use the external reference power supply of needs whether, determine whether the 4th group of power supply needs and definite magnitude of voltage, the 5th group of power supply is the excitation power supply of sensitive element or sensor, its voltage is set as required, but thermopair does not need this group power supply.The circuit pattern as shown in Figure 5.
Conductive bearing (10), (10 '): the inner and outer ring of this conductive bearing (10), (10 ') connects with rotating part and stationary part respectively, system power supply ± the 9V common port is connected to conductive bearing (10), (10 '), provides power supply for rotating part by conductive bearing (10), (10 ').
Totally three groups of system's power supplies (11):
(1)+and 9V, 1A and common port ↓;
(2)-and 9v, 0.1A and common port ↓;
(3)+5V, 0.2A and common port
As seen, ± 9V have same common port ↓, this common port also is the reference potential of rotating part, and+common port of 5V communicates with ground in the principal computer, " ↓ " with "
" between insulate.
Optical transmission apparatus (12): this optical transmission apparatus (12) reception, corresponding with optical transmission apparatus (8) emission, receive and adopt photodiode, phototriode or sensitive elements such as light resistance, photoelectric cell, determine according to transfer rate; Light emitting diode or semiconductor laser are then adopted in emission.
Buffer circuit (13): when this buffer circuit (13) received, its function was shaping, buffering, and circuit as shown in Figure 6; When emission, then be one drive circuit, as shown in Figure 4.
Interface circuit (14): this interface circuit (14) is made up of an intelligent front end (141) and computer interface circuit (142), intelligent front end (141) carries out serial communication with the single-chip microcomputer in one 51 series monolithic and the rotary part and receives data, again serial code is converted to parallel sign indicating number, by computer interface circuit (142) data are sent into principal computer then, see shown in Figure 7, its baud rate is determined according to the picking rate of A/D converter, reach as high as 375K, the data that receive are through string and conversion, and after checking that data have inerrancy in transmission course, the notice principal computer is taken data away.
Computer interface circuit (142): it is made of bus driving circuits, address decoding circuitry, working mode selection circuit, can be online with inquiry mode or dma mode (channel mode) as required with principal computer, generally use inquiry mode under the not high situation of speed, theory diagram as shown in Figure 8.
Principal computer (15): this principal computer selects for use general 286PC machine to get final product.
Print and demonstration (16), (17): display and printer do not have specific (special) requirements, and display commonly used and printer all can be selected for use.
Rotary part in the work (111) rotates jointly by shaft coupling and testee, and therefore, components and parts and line in the rotary part (111) all bear centrifugal force, and the size of centrifugal force is:
For example: n=3000 rev/min, R=0.05 rice, then
F=5000.m ≈ 500mg is about 500 times that centrifugal force reaches original weight.Therefore must consider the firmness that installs and fixes of components and parts.Under the situation that bulk allows, rotary part should be done it thinly long, with the minimizing radius R, thereby reduces the centrifugal force that components and parts bear.
The present invention can be operated under the rugged environment, if be used under general condition or the good conditions, effect can be better.
Technical conditions:
1. sensitive element is 120 Ω strainometers
2. sensitive element driving voltage 2.5V (volt)
3. strain measurement scope 100 μ V-800 μ V (microvolt) (40-320 μ ε) (microstrain)
4. rotating speed is 5000 rev/mins
5. input channel several 16
6. resolution 2 μ ε (microstrain)
7. frequency response 0-500HZ (conspicuous)
8. passage switching rate 200ms (millisecond)
The master routine software of native system is partly formed by three altogether:
1, the software of single-chip microcomputer in the rotary part; 2, the software of single-chip microcomputer in the interface board for computers; 3, the software of principal computer; Wherein,
The software of single-chip microcomputer mainly is in this rotary part: the data acquisition system (DAS) work in the drive controlling rotary part, comprise initialization, start timer, start A/D converter work, and the data behind the A/D coding are sent to the photoelectricity transmission parts with the form of serial code single-chip microcomputer; Its software flow pattern as shown in figure 13;
The software of single-chip microcomputer mainly is in this interface board for computers: control receives the serial code that rotary body is sent, string---and change, and send principal computer with data; Its software flow pattern as shown in figure 14;
The software of this principal computer mainly is: the data of A/D converter are read in control, and according to user's needs with data presentation, printing, deposit; Its program flow diagram as shown in Figure 9.
Claims (7)
1. photoelectric transmission rotary body multichannel measuring system that is used to measure the physical quantity on the rotary body, it is characterized in that: this system mainly includes and is installed in parts on the revolving part in the rotary body and claims rotary part (111) and be installed in that the parts on non-rotating and the outer parts of rotary body claim stationary parts (112) two parts and system software to form in the rotary body;
Rotary part (111) includes sensitive element (1), miniature data acquisition system (DAS) (211), optical communication means (212), power supply (213), this rotary part (111) removes sensitive element (1) and is installed on any measured point of tested revolving part, remaining parts welds or is installed on the printed circuit board (PCB), printed circuit board (PCB) is seated in the cylindrical housings, and this cylindrical housings is installed in the space of hollow space (215) of rotary shell (214); Include in the miniature data acquisition system (DAS) (211) in rotating part (111): analog switch (2), biasing circuit (3), amplifier (4), mould/number (A/D) converter (5) and single-chip microcomputer (6); In optical communication means (212), include: light drive circuit (7) and optical transmission apparatus (8); In power supply (213), include: the rotary part conductive bearing (10) on power circuit (9) and the rotary body, (10 '); Its annexation is: the sensitive element (1) in the rotary part (111) is installed on the tested revolving part as required, its output terminal connects the analog switch (2) in the miniature data acquisition system (DAS) (211), the output terminal of analog switch (2) connects the input end of biasing circuit (3), the output terminal of biasing circuit (3) connects the input end of amplifier (4), the input end of the output terminal connection mode of amplifier (4)/number (A/D) transducer (5), the output terminal of mould/number (A/D) transducer (5) connects single-chip microcomputer (6), the output of single-chip microcomputer (6) connects the input end of the light drive circuit (7) in the optical communication means (212), the output terminal of light drive circuit (7) connects optical transmission apparatus (8), is rotary part (111) power supply by power circuit (9);
Stationary parts (112) includes system's power supply (11), optical communication means (12), buffer circuit (13), interface circuit (14), principal computer (15), printer (16) and display (17); Wherein be installed in non-rotating locating shaft (216) in the rotary body go up except that optical transmission apparatus (12), remaining all is seated in outside the solid of revolution; Its annexation is: the optical transmission apparatus (12) in the stationary parts (112) connects buffer circuit (13), the input end of the output terminal connecting interface circuit (14) of buffer circuit (13), the output terminal of interface circuit (14) connects principal computer (15), principal computer (15) connects printer (16), display (17) simultaneously, and system's power supply (11) is rotary part (111) and stationary parts (112) power supply;
System software is made up of three parts altogether:
The software of single-chip microcomputer in A, the rotary part; The software of single-chip microcomputer in B, the interface board for computers; The software of C, principal computer; Wherein,
The software of single-chip microcomputer mainly is in this rotary part: the data acquisition system (DAS) work in the drive controlling rotary part, comprise initialization, start timer, start the work of mould/number (A/D) converter, and the data after mould/number (A/D) encoded are sent to the photoelectricity transmission parts with the form of serial code single-chip microcomputer;
The software of single-chip microcomputer mainly is in this interface board for computers: control receives the serial code that rotary body is sent, and string one is conversion in the lump, and send principal computer with data;
The software of this principal computer mainly is: the data of mould/number (A/D) converter are read in control, and according to user's needs with data presentation, printing, deposit.
2. photoelectric transmission rotary body multichannel measuring system according to claim 1, it is characterized in that: the sensitive element (1) in the rotary part (111) can be strainometer or thermal resistance (RTD1, RTD2 according to measuring needs, RTDn), thermopair (T1, T ... Tn), bridge-type pressure or load transducer (P1, P2 ... Pn), its excitation power supply is provided by power circuit (9), and connected mode adopts connection method altogether.
3. photoelectric transmission rotary body multichannel measuring system according to claim 1, it is characterized in that: the biasing circuit (3) in the miniature data acquisition system (DAS) (211) is that the difference according to the sensitive element (1) that uses determines its connected mode, when sensitive element (1) use is strainometer or thermal resistance (RTD1, RTD2 ... RTDn) time, its circuit connecting mode is, power supply connects an end of resistance R 1, one end of the other end serial connection pot (VR) of resistance R 1, the end of the other end series resistor R2 of pot (VR), the other end ground connection of resistance R 2, the intermediate point of pot (VR) connects high-end (+) of amplifier (4), and the output terminal of analog switch (2) connects the low side (-) of amplifier (4); When sensitive element (1) use is thermopair (T1, T2 ..., Tn) or bridge pressure sensor (P1, P2 ... Pn) time, then do not need biasing circuit (3), adopt analog switch (2) directly to connect amplifier (4).
4. photoelectric transmission rotary body multichannel measuring system according to claim 1, it is characterized in that: the connected mode of the light drive circuit (7) in the optical communication means (212) is: electric capacity (C1) is with resistance (R1) and connect the base stage that back one end is connected single-chip microcomputer (6) other end connection triode (Q1), the grounded emitter of triode (Q1), the collector of triode (Q1) connects the 5V power supply by resistance (R2), resistance (R2) is connected the positive pole of optical transmission apparatus (8) with the common port of triode (Q1), the minus earth of optical transmission apparatus (8), the transmission of light signal can be that a side sends, the one-way transmission mode that one side receives also can be that two sides all can receive, the transmitted in both directions mode that sends.
5. photoelectric transmission rotary body multichannel measuring system according to claim 1 is characterized in that: power circuit (9) in the power supply (213) adopts three-terminal regulator block 7806,7805,78XX, 7906 to provide ± 6V, 5V, mould/number (A/D) converter (5) and the required power supply of sensitive element (1).
6. photoelectric transmission rotary body multichannel measuring system according to claim 1, it is characterized in that: the connected mode of the buffer circuit (13) in the stationary parts (112) is, resistance (R1, R2, R4, R6) a end connects+the 5V power supply after linking to each other, the other end of resistance (R1) connects the negative pole of optical transmission apparatus (12), the positive pole of optical transmission apparatus (12) connects the base stage of triode (Q1), the collector of triode (Q1) connects the other end of resistance (R2), also connect resistance (R3) end in parallel simultaneously with electric capacity (C1), resistance (R3) is connected the base stage of triode (Q2) with the other end of electric capacity (C1) parallel connection, the collector of triode (Q2) connects the other end of resistance (R4), end after also connecting resistance (R5) simultaneously and electric capacity (C2) being in parallel, resistance (R5) is connected the base stage of triode (Q3) with the other end after electric capacity (C2) parallel connection, the collector of triode (Q3) connects the other end of resistance (R6), and the emitter of triode (Q1 ' Q2 ' Q3) is ground connection simultaneously.
7. photoelectric transmission rotary body multichannel measuring system according to claim 1, it is characterized in that: the interface circuit (14) in the stationary parts (112), form by intelligent front end (141) and computer interface circuit (142) two parts, signal from buffer circuit (13) output at first send intelligent front end (141), send computer interface circuit (142) then, machine interface circuit (142) is sent into principal computer (15) as calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94104533A CN1058786C (en) | 1994-04-28 | 1994-04-28 | Photoelectric transmission rotary body multichannel measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94104533A CN1058786C (en) | 1994-04-28 | 1994-04-28 | Photoelectric transmission rotary body multichannel measuring system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1115379A CN1115379A (en) | 1996-01-24 |
| CN1058786C true CN1058786C (en) | 2000-11-22 |
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ID=5031651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94104533A Expired - Fee Related CN1058786C (en) | 1994-04-28 | 1994-04-28 | Photoelectric transmission rotary body multichannel measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1058786C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134988A (en) * | 2013-01-31 | 2013-06-05 | 中国科学院上海技术物理研究所 | Multichannel value of resistance automation measuring system |
| CN108982899B (en) * | 2018-08-03 | 2020-12-01 | 北方工业大学 | Force balance type closed loop angular velocity sensor |
-
1994
- 1994-04-28 CN CN94104533A patent/CN1058786C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1115379A (en) | 1996-01-24 |
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