CN1203306C - In-situ magnetic tape pinhole detector - Google Patents
In-situ magnetic tape pinhole detector Download PDFInfo
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- CN1203306C CN1203306C CN 01127844 CN01127844A CN1203306C CN 1203306 C CN1203306 C CN 1203306C CN 01127844 CN01127844 CN 01127844 CN 01127844 A CN01127844 A CN 01127844A CN 1203306 C CN1203306 C CN 1203306C
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Abstract
The present invention relates to a device for the on-line detection of tape pinholes, which comprises a photoelectric sensor composed of an infrared emitter and an infrared receiver and a data processor composed of a signal processing circuit of the sensor, a multichannel simulation switching circuit, a microcomputer circuit, a pinhole display screen circuit, a detection information display screen circuit, an up printer, a keystoke input circuit, an external controller and a belt length calculating circuit. The present invention provides magnetic layer quality inspecting means and equipment which have the advantages of simplicity, practicability and low price, are suitable for the continuous operation of production lines, and can accurately search, record, store and display the specific positions of various defects.
Description
Technical field
There is the device of defectives such as pin hole (bright spot), destarch, cut, glue rumble dirt seal on the magnetic coating magnetosphere surface that the present invention relates to industrial online detection record-reproduce head, audio tape, computer floppy disk.
Background technology
The magnetosphere coating quality of record-reproduce head, audio tape, computer floppy disk is one of topmost index of magnetic recording industry.There are defectives such as pin hole (bright spot), destarch, cut, glue rumble dirt seal on coating magnetosphere surface, and perhaps magnetosphere is too thin, does not just write down image, sound and information, and the electrical property of tape is greatly reduced so that scrap.This is the main cause that domestic and international tape user quality is complained.Some tape manufacturer increases the coating thickness of magnetisable coating in order to reduce above-mentioned surface imperfection, but this can cause raising of tape cost and other quality problems again.Tape is produced, and from spreading band, press polish, cutting operations such as bringing to the dress box, all is to carry out in running up, and general per minute tape transport is more than 300 meters.Up to now, domestic also do not have defective such as a kind of electronic equipment can detect magnetosphere at any time on the production line of high-speed cruising pin hole, destarch point, cut and detect magnetic coating thickness.Even the large enterprises that produce of tape at home, still adopt the classic method of eye-observation and manual thickness measuring, be that the tape tape-cutting machine is when cutting band at a high speed, utilize the irradiation of fluorescent light, the operator observes screen board with eyes at any time, when observing bright spot, light, destarch piece, the position that the manual record defective occurs.This manual observation method is used till today always.Because it is very fast to cut tape speed, also owing to the visual fatigue and the carelessness of human eye, the mistakes and omissions of searching defective are just more, and the position of record is also inaccurate.Obvious like this can not really the reflection put in order volume tape magnetosphere coating condition, can not accurately search defectives and the timely positions that occur of writing down such as pin hole, stroke road, let alone On-line Control.Be head it off, some offshore companies adopt many quick video cameras, and online shooting tape surface imperfection is also used the PC process information, but this method involves great expense, complexity.
Summary of the invention
The present invention " in-situ magnetic tape pinhole detector " proposes for addressing the above problem just.Purpose provides a kind of adaptation production line and moves continuously, can accurately search, write down, store, show the particular location that various defectives occur, simple and practical, that price is cheaper magnetosphere quality testing means and equipment.
The structure of the in-situ magnetic tape pinhole detector that the present invention is designed, comprise photoelectric sensor and data processor, described photoelectric sensor is made of infrared transmitter and infrared remote receiver, infrared transmitter adopts red light emitting diodes, infrared remote receiver adopts the continuous belt ir photodiode array, and photodiode array covers whole tape width; Described data processor comprises sensor signal processing circuit, multi-channel analog switch circuit, microcomputer circuit, pin hole display screen circuit, detects information display screen circuit, mini-printer, button inputting circuits, external control and belt length numeration circuit and direct supply group circuit; Described sensor signal processing circuit is made of sensor input signal follower, time-delay follow circuit, reference signal generator and peak comparator, and operational amplifier C constitutes the time-delay follow circuit with resistance-appearance delay circuit of being made up of resistance R 6 and capacitor C 2; The output terminal of photoelectric sensor is connected to the input end of sensor signal processing circuit, the output terminal of sensor signal processing circuit is connected to the I/O port of microcomputer circuit by multi-channel analog switch circuit, described microcomputer circuit also is connected with pin hole display screen circuit, detection information display screen circuit, button inputting circuits, external control and belt length numeration circuit by each I/O port, microcomputer circuit is connected with mini-printer by spp, and direct supply group circuit provides the galvanic current source to each circuit.
Apparatus of the present invention are installed on the high speed tape-cutting machine, and during work, tape to be measured passes through fast from the magnetic track channel slot between transmitter and the receiver.Transmitter sends the infrared light of stabilized intensity, is radiated at above the tape to be measured, and infrared light incides infrared remote receiver after tape absorbs.The instant Input Data Process of the light signal of online detected each magnetic track of infrared remote receiver.After data processing, note position that various tape defectives such as pin hole, cut, destarch piece, dirt seal occur, number etc. by the light signal of sensor input, and instant playback.Defect condition such as pin hole are by the printer printing of tabulating at any time.The high speed tape-cutting machine is equipped with the edging device, and when guaranteeing tape band cloth high-speed mobile, the relative position with photoelectric sensor remains unchanged at any time.For which magnetic track accurate recording defect appears at, which belt length section, the detection of apparatus of the present invention starts, stops, resetting, belt length numeration etc. controlled by the high speed tape-cutting machine.
The present invention can reach following technique effect:
1, invention can the various case of surface defects of approximate simulation " human eye " On line inspection tape, and find out pin hole (bright spot), cut immediately, lack slurry, dirt seal, shallow layer point, and accurate recording, the printing position and the quantity that occur.Accurately reject underproof tape section (about 17000 feet of each deep bid tape) when being convenient to quality inspection, prevent that effectively the people from being mistakes and omissions, guarantee quality of tape.
2, adopt photoelectric sensor of the present invention, can be according to the online transmittance of judging (thereby being magnetic coating thickness), with tape sorting.Is substandard products as transmittance greater than 1.8% tape.Transmittance less than 1.2% be the one-level band.Transmittance is the secondary band 1.2% to 1.8%.And the result is printed in tabulation.Online tape sorting manually can't be finished.So just guarantee product stepping quality, control the tape production cost again well.
3, use photoelectric sensor of the present invention, can also be implemented in the linear light degree and measure, help magnetosphere coating thickness On-line Control.
4, the present invention has the widespread usage meaning, except the magnetic recording industry, can also be used for industries such as papermaking, light industry.
Description of drawings
Below be the accompanying drawing drawing explanation of the specific embodiments of this in-situ magnetic tape pinhole detector:
Fig. 1 is photosensor structure figure;
Fig. 2 is the fast photodiode array of figure;
Fig. 2-A is the local figure of fast photodiode array;
Fig. 3 is a data processor electricity functional-block diagram;
Fig. 4 is online tape V
sBaseline chart;
Fig. 5 is an in-situ magnetic tape pinhole detector motherboard circuit schematic diagram;
Fig. 6 is microcomputer circuit figure;
Fig. 7 is the in-situ magnetic tape pinhole detector program flow diagram.
Embodiment
Be described in further detail below in conjunction with the embodiment of accompanying drawing this in-situ magnetic tape pinhole detector:
1, the structure of photoelectric sensor (probe)
Photoelectric sensor is made up of infrared transmitter and infrared remote receiver.Structural drawing is seen Fig. 1.9 is launcher, the 10th, and acceptance frame, the tape channel groove between 11 expression launchers and the acceptance frame; 12 and 13 represent dash receiver cover and expelling plate cover respectively.Sensor adopts banded structure, 520 millimeters of total lengths, and tape channel groove 350 millimeters long, transmitter and receiver spacing are 5 millimeters.Sensor must be fixed on a certain appropriate position of tape-cutting machine during work, and tape band cloth can be passed through fast from " freedom " between transmitter and the receiver.The mechanical component of probe must not with tape to be measured " friction " mutually.Under the effect of tape-cutting machine edging device, when tape passes through probe fast, can not cause the light leak wrong report of probe edge owing to swinging.
Infrared transmitter adopts " face " light source of super brightness.Tape to be measured has logical preferably light " window " in the near-infrared region, thereby the present invention adopts red light emitting diodes (LED).Switching Power Supply with big electric current drives.
Infrared remote receiver adopts banded photodiode array, is divided into every group of some groups corresponding to a magnetic track of tape, and every group of photodiode two rows are pressed the isosceles triangle dislocation and arranged in the array, and the interval between every group of photodiode is less than 1 millimeter.
Receiver is the critical component of probe.The infrared electro diode array that the present invention selects high sensitivity for use, responds fast.As shown in Figure 2.14 is dash receiver, 15 expression infrared photodiode arrays, and Fig. 2-A is the partial enlarged drawing of one group of infrared photodiode array A, 17 is fast photodiode.
(1), since the tape defective position to occur be at random, the infrared photodiode array must cover whole tape width.We adopt the infrared photodiode array of banded structure, and width is 320 millimeters.Be divided into 25 groups, in 12 millimeters every group width, 10 infrared photodiodes be installed.Leave less than 1 mm clearance flase drop between avoiding between every group of infrared photodiode.Every group of infrared photodiode arranged by isosceles triangle and (seen local Fig. 2 of array-A), to prevent the defective omission in the array.Because it is the central area of photodiode front lenslet that infrared photodiode receives sensitive locations, and some luminous point dimension is less than 1 millimeter, photovoltaic array captured the little defective that any zone of tape occurs when like this, the isosceles triangle arrangement architecture just might guarantee online the detection.
(2), tape running speed is exceedingly fast in the band owing to cutting, usually more than 300 meters/minute.Luminous point is to flash across to the pin hole of 1 millimeter dimension less than 0.1 millisecond the residence time on receiver infrared photodiode array.Therefore, photosensitive device must have very high sensitivity and fast response speed in the infrared photodiode array.The present invention selects the fast infrared photodiode for use, and rise time, fall time are all less than 0.05 microsecond.Photoelectric cell or general linear CCD (photoelectricity coupling) device all are difficult to satisfy fast and respond, read fast this requirement.
(3), " array " of transmitter " face " light source and receiver all is made up of many superhigh intensity red light emitting diodes (LED) and infrared photodiode.The consistance of element electrical property is just particularly important.Photoelectric device must be selected and install meticulously through strictness.For the receiving sensitivity of adjusting each group pattern with prevent " saturated " phenomenon that the follow-up signal treatment circuit may occur, the present invention selects the sensor circuit shown in Fig. 5-18 for use.Totally 25 groups, with the infrared photodiode array design on same dash receiver.Under the transmitting illuminant stable condition,, make each group of receivers array sensitivity easily near consistent by regulator potentiometer VR1.Capacitor C 1 and resistance R 1, R2 form every straight clamp circuit, and the output signal baseline of each group pattern is remained near zero volt substantially.Otherwise for the higher tape of transmittance,, might make signal processing circuit " saturated " phenomenon occur, measuring ability was lost efficacy because the background output signal is excessive.
2, data processor and a few part Key Circuit
Data processor mainly is made up of sensor signal processing circuit, multi-channel analog switch circuit, microcomputer circuit, pin hole display screen circuit, detection information display screen circuit, button inputting circuits, external control and belt length numeration circuit and direct supply group circuit etc.Functional-block diagram as shown in Figure 3.Send into 25 group pulse comparers in the sensor signal processing circuit respectively by 25 road light signals of photoelectric sensor output, those are higher than the light pulse of setting datum and just are converted into high level (TTL) pulse and export.Other are low level.Each road comparator output signal is sent into multi-channel analog switch circuit, and 25 the tunnel convert 4 road signals to.Micro computer by 4 I/O (I/O) mouthful at any time, the output terminal of scanning search 25 road comparator circuits fast.And the output signal on each road stored the particular location that the pulse of record output simultaneously occurs.The pin hole display screen is made up of 25 infrarede emitting diodes (LED), by I/O (I/O) mouth, micro computer is sent canned data into pin hole display screen circuit, and which road the instant playback of pin hole display screen defective occurs, and corresponding infrarede emitting diode (LED) is luminous.Micro computer is connected with detection information display screen circuit with button inputting circuits by I/O (I/O) mouth.Import and detect information display screen (forming) by button and can search the position (which tape, which belt length section) of tape defective appearance, number, belt length etc. at any time by 5 charactrons.Micro computer joins by spp (centronics) and mini-printer.Printer is tabulated at any time and is printed the tape defect condition.Data processor has also designed many groups DC power supply circuit.High-current switch circuit provides stable power to photoelectric sensor, guarantees the stable emission of probe infrared light.The high speed tape-cutting machine is by joining near the external control in switch, keyswitch, relay switch etc. and the data processor, belt length numeration circuit, by photoelectric isolating circuit I/O (I/O) mouth of micro computer is sent in control information, thereby data processor is synchronoused working with the high speed tape-cutting machine.
The physical circuit of each part mentioned above is as shown in Figure 5: wherein, 5-18 is a sensor circuit, 5-19 is a sensor signal processing circuit, 5-20 is a multi-channel analog switch circuit, 5-21 is external control, belt length numeration circuit, 5-22 is a pin hole display screen circuit, and 5-23 is for detecting the information display screen circuit, and 5-24 is I/O (I/O) interface of computing machine.
Below a few part Key Circuit are described in further detail.
(1), sensor signal processing circuit
Sensor signal processing circuit is one of gordian technique of the present invention.The schematic diagram of described sensor signal processing circuit is shown in Fig. 5-19.Constitute by sensor input signal follower, time-delay follow circuit, reference signal generator and peak comparator; Resistance R 3, resistance R 4 and operational amplifier A constitute the sensor input signal follower; Operational amplifier C constitutes the time-delay follow circuit with resistance-appearance (RC) delay circuit of being made up of resistance R 6 and capacitor C 2; Operational amplifier D and resistance R 7, resistance R 8, resistance R 9, resistance R 10 constitute reference signal generator; Operational amplifier B is a peak comparator; Sensor input signal V
sIn-phase input end through resistance R 3 input operational amplifier A, resistance R 4 is connected between the inverting input and output terminal of operational amplifier A, the output terminal of operational amplifier A is divided into two-way, one the tunnel receives the in-phase input end of operational amplifier B, the in-phase input end of input operational amplifier C behind resistance-appearance (RC) delay circuit that another road is formed via resistance R 6 and capacitor C 2, the output voltage V of the output terminal of operational amplifier C
s' be input to the in-phase input end of operational amplifier D through resistance R 7, preset reference voltage △ also is input to the in-phase input end of operational amplifier D through resistance R 10, resistance R 8 is connected between the inverting input and output terminal of operational amplifier D, resistance R 9 is connected between the inverting input and earth terminal of operational amplifier D, the output terminal of operational amplifier D is connected to the inverting input of operational amplifier B, and the output terminal of operational amplifier B is connected to the input end of said multi-channel analog switch circuit as the output terminal of sensor signal processing circuit.
The basic circuit principle of work is: peak comparator B, and sensor input signal voltage Vs sends into in-phase input end through follower A, and the reference voltage VR of setting sends into inverting input.Voltage difference is designated as △ between reference voltage VR and applied signal voltage Vs baseline.As applied signal voltage Vs during greater than reference voltage VR, comparer is exported a TTL pulse signal.As applied signal voltage Vs during less than reference voltage VR, comparer does not overturn, and keeps low level.Promptly there is not signal output.Sensitivity can solve by size (being embodied as the size of △) and the adjusting signal of sensor voltage that changes reference voltage.But basic comparator circuit is to be difficult to use in the practicality operation.At first the tape kind of a high speed tape-cutting machine cutting is a lot, and transmittance (being thickness) difference is very big.For a certain setting reference voltage VR, machine on some tape one, comparer output may all be high level just.The tape that some is thick, even bigger luminous point is arranged, comparer may also all be a low level, can't detect at all.In addition, for certain fixing tape, also exist the contradiction of detection sensitivity and tape background noise.Such as, for the tape of transmittance 1.0%, general transmittance unevenness is at 0.2%-0.3%, have in addition more than 0.4%.When the high speed tape transport, applied signal voltage Vs baseline is similar to sinusoidal fluctuation to be changed, as shown in Figure 4.From improving the comparer detection sensitivity, reference voltage VR and applied signal voltage Vs baseline are approaching more good more, and less like this luminous point pulse can both detect.If but tape transmittance unevenness to be measured is big, thereby noise is big, its applied signal voltage Vs baseline will exceed reference voltage VR and make comparer that output signal be arranged in some place, causes flase drop, and this is unallowed.
At above-mentioned two problems, in signal processing circuit, add " time-delay follow circuit ", as the resistance R among Fig. 5-19 6, capacitor C 2.The thinking main points are that reference voltage no longer is a fixed level, but follows the baseline variation of applied signal voltage Vs.Find out from Fig. 5-19, applied signal voltage Vs behind resistance-appearance (RC) delay circuit with △ voltage superposition, composite signal (Vs+ △) is sent into the inverting input of comparator circuit as reference voltage VR.So just, exceed the △ magnitude of voltage than baseline voltage always can both guarantee reference voltage no matter how the input signal baseline waveform changes.Only occur as the tape defective, superposition one signal pulse on baseline, when pulse exceeded reference voltage VR, comparer just had output.Otherwise, no matter how baseline level changes, always comparer does not have maloperation.Under big noise situations, the △ magnitude of voltage also can be obtained less like this, improves to detect sensitivity.
Resistance-appearance (RC) delay circuit shown in Fig. 5-19 is a critical component.Because if definitely following applied signal voltage Vs, reference voltage VR changes, then when input signal had light pulse to occur, light pulse also appearred in reference voltage VR synchronously, and applied signal voltage Vs just surmounts reference voltage VR never like this, big again light point defects, comparer do not go out signal yet.Therefore must slightly make the variation of the slow applied signal voltage Vs of reference voltage VR.But reference voltage VR time-delay is also not all right too much, and reference voltage VR has been similar to a direct current level again like that.The sensor signal processing circuit of the present invention design overcomes the contradiction of detection sensitivity and tape basic unit noise effectively.The dimension smaller defect can both be detected, flase drop can not occur again simultaneously.For tape, above-mentioned signal processing circuit is wanted 25 groups.
(2), multi-channel analog switch circuit
The multi-way switch schematic diagram is shown in Fig. 5-20.Constitute by integrated of three analog switches (model is 4051).Latch in the microcomputer circuit (model is 373) sends three control lines are connected to three analog switches integrated (4051) simultaneously after drawing on resistance R 11, R12, the R13 A, B, C end.Article three, control line has 8 kinds of combinations, so each analog switch integrated (4051) can be imported the signal of 8 sensors, by the various combination of A, B, C end, the output terminal X of analog switch integrated (4051) just is communicated with one of them sensor.P1.0, P1.1, P1.2, P1.3 are central processing unit (CPU) mouthful lines in the microcomputer circuit, be used for patrolling and examining 25 sensors specially, wherein P1.0, P1.2, P1.3 connect the X end of three corresponding analog switches integrated (4051) respectively, each manages patrolling and examining of 8 sensors, mouth line P1.0 is responsible for patrolling and examining of 1 to No. 8 sensor, mouth line P1.2 is responsible for patrolling and examining of 10 to No. 17 sensors, and a mouthful line P1.3 is responsible for patrolling and examining of 18 to No. 25 sensors, the detection of mouthful responsible No. 9 sensor of line P1.1.
Micro computer is searched the output terminal of 25 groups of signal processing circuits by 4 mouth lines of scan for inquiries, and detected result storage rapidly advances computing machine and processes and displays.What will particularly point out here is that the computer scanning inquiry velocity must be enough fast.Point out that above the residence time of the light point defects that dimension is 1 millimeter on photovoltaic array be less than 0.1 millisecond, obviously computer scanning inquire about the required All Time of 25 groups of signals output must be much smaller than 0.1 millisecond, otherwise omission can appear.One-chip computer adopts 12 megahertzes (MHZ) crystal oscillator and rapid random access memory devices such as (RAM) for this reason.
(3), external control and belt length numeration circuit
The present invention searches the various defectives of tape and the tape thickness classification is carried out on production line.For the various defectives of accurate recording appear at which road, which belt length section, obviously this device must with tape tape-cutting machine synchronous operation, such as start, reset, stop, belt length numeration etc.We have adopted external control and the belt length numeration circuit of Fig. 5-21 for this reason.This circuit constitutes out control circuit by resistance R 18, resistance R 16, resistance R 17, capacitor C 5, photoisolator (model is 4N25) and button, by constitute belt length numeration circuit near switch (model is PS25), resistance R 14, resistance R 15, capacitor C 4 and photoisolator (model is 4N25).The magnetic tape station start, 24V is provided power supply, by resistance R 18, resistance R 16 conducting photoisolators (4N25), the output terminal of photoisolator (4N25) and resistance R 17, capacitor C 5 connect together and are low level, this signal is passed to the mouth line P1.7 of microcomputer circuit central processing unit (CPU), and instrument begins to detect; Otherwise magnetic tape station is shut down, and disconnects the 24V power supply, and instrument stops to detect; Button is used for detection and resets.(PS25) sends pulse according to the length of tape near switch, by resistance R 14 conducting photoisolators (4N25), photoisolator (4N25) output terminal that connects together with resistance R 15, capacitor C 4 is also corresponding pulse to occur, this signal is passed to central processing unit (CPU) the counting end T0 of microcomputer circuit, and instrument just can demonstrate the length of the tape of surveying.
(4) pin hole display screen circuit
Described pin hole display screen circuit is made of 25 light emitting diodes and 3 drivers (model is 75451) shown in Fig. 5-22.C5, C6, C7 are three control lines from the code translator in the microcomputer circuit (model is 74LS 138), they send over eight sections by driver (75451) and microcomputer circuit and show that sign indicating number (a, b, c, d, e, f, g, dp) combines, and shows the pin hole detection case of each magnetic track.
(5) detect the information display screen circuit
Described detection information display screen circuit is made of 5 charactrons, 5 drivers (model is 75451), 8 triodes (model is 9012) and two not gates (model is 74LS05) shown in Fig. 5-23.C0, C1, C2, C3, C4 are five control lines from the code translator in the microcomputer circuit (model is 74LS 138), they send over eight sections by driver (75451) and microcomputer circuit and show that sign indicating number (a, b, c, d, e, f, g, dp) combines, and shows detection information.
(6) microcomputer circuit
Microcomputer circuit schematic diagram of the present invention as shown in Figure 6.
Selecting model for use is the one-chip computer chip of 78E52, includes memory under program, crystal oscillator 11.7 megahertzes.The central processing unit (U1) of one-chip computer chip (78E52), latch 74LS373 (U2), code translator 74LS138 (U3) and random memory HM6264 (U4) form basic micro-computer unit.Keyboard display chip D8279C (U10), code translator 74LS138 (U12) and not gate 74LS06 (U11) constitute light emitting diode (LED) and show and the keyboard input adapter.D-latch 74LS373 (U9) and Sheffer stroke gate 74LS02 (U8) channeling analog switch channel selecting interface circuit.D type flip flop 74LS273 (U7), one shot multivibrator 74LS123 (U5) or door 74LS32 (U6) form the mini-printer interface circuit.MAX202 (U13) is a RS232 serial port chip.The I/O (I/O) of programmable keyboard/display interface D8279C (U10) mouthful line DB0, DB1, DB2, DB3, DA0, DA1, DA2, DA3 and RL1, RL2, the delivery outlet line C0 of code translator 74LS138 (U12), C1, C2, C3, C4, C5, C6, C7 are connected with corresponding I/O (I/O) mouthful line of Fig. 5 respectively.P1.0, the P1.1 of the central processing unit (U1) of Q5, the Q6 of D-latch 74LS373 (U9), Q7 end and one-chip computer chip (78E52), P1.2, P1.3 mouth line are connected with I/O (I/O) mouthful line of multi-channel analog switch circuit among Fig. 5.Out control circuit signal among Fig. 5-21 is sent into the P1.7 mouth of central processing unit among Fig. 6 (CPU).Belt length counting circuit output terminal communicates with counter T0 in the central processing unit (CPU).
(7) button inputting circuits
Described button inputting circuits shows that by the keyboard in the microcomputer circuit special-purpose sheet (model is 8279), code translator (model is 74LS 138), resistance R 19 and resistance R 20 constitute.Keyboard shows that the mouth line RL1 of special-purpose sheet (8279) and a mouthful line RL2 receive power Vcc by resistance R 19 and resistance R 20 respectively, control line C0, control line C1, control line C2, control line C3 and control line C4 that code translator (74LS 138) is drawn periodically provide low level, in case certain button is pressed, corresponding C control line and RL mouth line will short circuits, and central processing unit (CPU) horse back is made corresponding processing.
3, computer program process flow diagram.
The microcomputer circuit that this in-situ magnetic tape pinhole detector is moves by following program work.Its program flow diagram as shown in Figure 7.Behind the computer initialization, make detection information show " 0000 ".Do not receive and begin to detect before the instruction demonstration " 0000 " always.When computing machine receive begin to detect instruction after, enter trace routine.Beginning belt length counting and scanning detect the output signal of each group of photoelectric sensor, and when detecting " bright spot ", computing machine is write down the tape serial number and the corresponding belt length section of appearance " bright spot ".Bright corresponding magnetic track pilot lamp.Detect second " bright spot " from last one " bright spot " again above 80 English Foot and then add 1 at corresponding magnetic track accumulative total bright spot number, unit increases by 1 at the total number scale deposit receipt of bright spot.Do not stop to detect instruction if receive, this device just goes round and begins again is in detected state.In case be subjected to " stop detect " instruction, device stops to detect, and sends or the reception testing result, then or print testing result, perhaps selects to show testing result according to the user.If there is the instruction that begins to detect to arrive again, each storage element begins to count belt length and surveys sensor clearly.Repeat above-mentioned working procedure.
Claims (10)
1. in-situ magnetic tape pinhole detector, comprise photoelectric sensor and data processor, it is characterized in that described photoelectric sensor is made of infrared transmitter and infrared remote receiver, infrared transmitter adopts red light emitting diodes, infrared remote receiver adopts the continuous belt ir photodiode array, and photodiode array covers whole tape width; Described data processor comprises sensor signal processing circuit, multi-channel analog switch circuit, microcomputer circuit, pin hole display screen circuit, detects information display screen circuit, mini-printer, button inputting circuits, external control and belt length numeration circuit and direct supply group circuit; Described sensor signal processing circuit is made of sensor input signal follower, time-delay follow circuit, reference signal generator and peak comparator, and operational amplifier C constitutes the time-delay follow circuit with resistance-appearance delay circuit of being made up of resistance R 6 and capacitor C 2; The output terminal of photoelectric sensor is connected to the input end of sensor signal processing circuit, the output terminal of sensor signal processing circuit is connected to the I/O port of microcomputer circuit by multi-channel analog switch circuit, described microcomputer circuit also is connected with pin hole display screen circuit, detection information display screen circuit, button inputting circuits, external control and belt length numeration circuit by each I/O port, microcomputer circuit is connected with mini-printer by spp, and direct supply group circuit provides the galvanic current source to each circuit.
2. in-situ magnetic tape pinhole detector according to claim 1, it is characterized in that the banded photodiode array that described infrared remote receiver adopts, be divided into every group of some groups corresponding to a magnetic track of tape, every group of photodiode two rows are pressed the isosceles triangle dislocation and are arranged in the array, and the interval between every group of photodiode is less than 1 millimeter.
3. in-situ magnetic tape pinhole detector according to claim 2 is characterized in that described photodiode adopts rise time and fall time all less than the infrared photodiode of 0.05 microsecond.
4. in-situ magnetic tape pinhole detector according to claim 2 is characterized in that the width of described banded photodiode array is 320 millimeters, is divided into 25 groups; In 12 millimeters every group width, 10 infrared photodiodes are installed.
5. in-situ magnetic tape pinhole detector according to claim 1 is characterized in that constituting the sensor input signal follower by resistance R 3, resistance R 4 and operational amplifier A; Operational amplifier D and resistance R 7, resistance R 8, resistance R 9, resistance R 10 constitute reference signal generator; Operational amplifier B is a peak comparator; Sensor input signal voltage V
sIn-phase input end through resistance R 3 input operational amplifier A, resistance R 4 is connected between the inverting input and output terminal of operational amplifier A, the output terminal of operational amplifier A is divided into two-way, one the tunnel receives the in-phase input end of operational amplifier B, the in-phase input end of input operational amplifier C behind resistance-appearance delay circuit that another road is formed via resistance R 6 and capacitor C 2, the output voltage V of the output terminal of operational amplifier C
sBe input to the in-phase input end of operational amplifier D through resistance R 7, preset reference voltage Δ also is input to the in-phase input end of operational amplifier D through resistance R 10, resistance R 8 is connected between the inverting input and output terminal of operational amplifier D, resistance R 9 is connected between the inverting input and earth terminal of operational amplifier D, the output terminal of operational amplifier D is connected to the inverting input of operational amplifier B, and the output terminal of operational amplifier B is connected to the input end of said multi-channel analog switch circuit as the output terminal of sensor signal processing circuit.
6. in-situ magnetic tape pinhole detector according to claim 1, it is characterized in that described multi-channel analog switch circuit is made of integrated of three analog switches, latch in the microcomputer circuit sends three control lines through resistance R 11, resistance R 12, be connected to the A of integrated of three analog switches after drawing on the resistance R 13 simultaneously, B, the C end, article three, control line has 8 kinds of combinations, so the integrated signal that can import 8 sensors of each analog switch, pass through A, B, the various combination of C end, the output terminal X that analog switch is integrated just is communicated with one of them sensor, P1.0, P1.1, P1.2, P1.3 is the CPU mouth line in the microcomputer circuit, be used for patrolling and examining 25 sensors specially, P1.0 wherein, P1.2, P1.3 connects the X end of integrated of three corresponding analog switches respectively, each manages patrolling and examining of 8 sensors, mouth line P1.0 is responsible for patrolling and examining of 1 to No. 8 sensor, mouth line P1.2 is responsible for patrolling and examining of 10 to No. 17 sensors, mouth line P1.3 is responsible for patrolling and examining of 18 to No. 25 sensors, and mouthful line P1.1 is responsible for the detection of No. 9 sensor.
7. in-situ magnetic tape pinhole detector according to claim 1, it is characterized in that described pin hole display screen circuit is made of 25 light emitting diodes and 3 drivers, C5, C6, C7 are three control lines from the code translator in the microcomputer circuit, they send over eight sections by driver and microcomputer circuit and show that sign indicating number combines, and shows the pin hole detection case of each magnetic track.
8. in-situ magnetic tape pinhole detector according to claim 1, it is characterized in that described detection information display screen circuit is made of 5 charactrons, 5 drivers, 8 triodes and two not gates, C0, C1, C2, C3, C4 are five control lines from the code translator in the microcomputer circuit, they send over eight sections by driver and microcomputer circuit and show that sign indicating number combines, and shows detection information.
9. in-situ magnetic tape pinhole detector according to claim 1, it is characterized in that described button inputting circuits shows special-purpose sheet by the keyboard in the microcomputer circuit, code translator, resistance R 19 and resistance R 20 constitute, keyboard shows that the mouth line RL1 of special-purpose sheet and a mouthful line RL2 receive power Vcc by resistance R 19 and resistance R 20 respectively, the control line C0 that code translator is drawn, control line C1, control line C2, control line C3 and control line C4 periodically provide low level, in case certain button is pressed, corresponding control line C and mouthful line RL will short circuits, and central processor CPU is made corresponding processing at once.
10. in-situ magnetic tape pinhole detector according to claim 1, it is characterized in that described external control and belt length numeration circuit is by resistance R 18, resistance R 16, resistance R 17, capacitor C 5, photoisolator and button constitute out control circuit, by near switch, resistance R 14, resistance R 15, capacitor C 4 and photoisolator constitute belt length numeration circuit, the magnetic tape station start, 24V is provided power supply, by resistance R 18 and resistance R 16 conducting photoisolators, the output terminal of photoisolator and resistance R 17 and capacitor C 5 connect together and are low level, this signal is passed to the mouth line P1.7 of microcomputer circuit central processor CPU, and instrument begins to detect; Otherwise magnetic tape station is shut down, and disconnects the 24V power supply, and instrument stops to detect; Button is used for detection and resets, send pulse near switch according to the length of tape, by resistance R 14 conducting photoisolators, the also corresponding pulse signal that occurs of photoisolator output terminal that connects together with resistance R 15 and capacitor C 4, this signal is passed to the central processor CPU counting end T0 of microcomputer circuit, and instrument just can demonstrate the length of the tape of surveying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127844 CN1203306C (en) | 2001-09-12 | 2001-09-12 | In-situ magnetic tape pinhole detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127844 CN1203306C (en) | 2001-09-12 | 2001-09-12 | In-situ magnetic tape pinhole detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1403799A CN1403799A (en) | 2003-03-19 |
| CN1203306C true CN1203306C (en) | 2005-05-25 |
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ID=4667754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01127844 Expired - Fee Related CN1203306C (en) | 2001-09-12 | 2001-09-12 | In-situ magnetic tape pinhole detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1203306C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102019297B (en) * | 2009-09-17 | 2012-11-14 | 宝山钢铁股份有限公司 | Device and method for detecting pinhole size classification in thin strip rolling process |
| CN102983849B (en) * | 2011-09-05 | 2015-09-02 | 中山碧图电子科技有限公司 | Dormancy formula correlation grooved Photoelectric infrared switch |
| CN102589451A (en) * | 2012-03-06 | 2012-07-18 | 深圳市华测检测技术股份有限公司 | Length measuring device for elastic rope of toy |
| CN103727886A (en) * | 2014-01-16 | 2014-04-16 | 深圳市华测检测技术股份有限公司 | Length measuring device for yoyo elastic tying rope |
| CN103727885A (en) * | 2014-01-16 | 2014-04-16 | 深圳市华测检测技术股份有限公司 | Detection method for yo-yo elastic tether length |
-
2001
- 2001-09-12 CN CN 01127844 patent/CN1203306C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1403799A (en) | 2003-03-19 |
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