CN105204320A - Measuring device and method for measuring delay time of fuse delay circuit - Google Patents
Measuring device and method for measuring delay time of fuse delay circuit Download PDFInfo
- Publication number
- CN105204320A CN105204320A CN201510657430.5A CN201510657430A CN105204320A CN 105204320 A CN105204320 A CN 105204320A CN 201510657430 A CN201510657430 A CN 201510657430A CN 105204320 A CN105204320 A CN 105204320A
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- circuit
- time
- fuse
- signal
- retardation
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
- G04F10/04—Apparatus for measuring unknown time intervals by electric means by counting pulses or half-cycles of an ac
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- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Measurement Of Unknown Time Intervals (AREA)
Abstract
The invention discloses a measuring device and method for measuring delay time of a fuse delay circuit. The measuring device comprises a power circuit, a trigger shaping circuit, a counter circuit and a time-base circuit. The trigger shaping circuit receives a manual starting signal and then generates two paths of signals which are a fuse delay starting signal output to the fuse delay circuit and a counting starting signal output to the counter circuit. The counter circuit counts time-base signals output by the time-base circuit after receiving the counting start signal. The fuse delay circuit starts a delay process after receiving the fuse delay starting signal. When the delay process is finished, the fuse delay circuit generates a detonator signal, the detonator signal trigger shaping circuit outputs a counting stop signal to the counter circuit, and delay time is obtained. The measuring device is simple in structure, convenient to operate, capable of actually simulating the working state of the fuse delay circuit, good in interference resistance, high in resolution ratio and precision and high in testing result uniformity and repeatability.
Description
Technical field
The invention belongs to automatic measurement technology field, relate to the measurement of the delay time of retardation time of fuse circuit, particularly a kind of measurement mechanism and measuring method measuring the retardation time of fuse circuit delay time.
Background technology
At present, the measuring method of retardation time of fuse circuit delay time mainly: use storage oscilloscope to gather manual triggers signal waveform and fuze action signal waveform respectively, then the delay time of measured waveform on oscillograph screen.Due to the restriction of oscillograph screen resolution, the uncertainty of artificial naked eyes judgement in addition, causes the consistance of test result and precision not high.
Summary of the invention
When using storage oscilloscope to measure the retardation time of fuse circuit delay time, due to the restriction of oscillograph screen resolution, the uncertainty of artificial naked eyes judgement in addition, causes the consistance of test result and precision not high.The object of the invention is to, for above-mentioned the deficiencies in the prior art, provide a kind of measurement mechanism and the measuring method of measuring the retardation time of fuse circuit delay time.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
Measure the measurement mechanism of retardation time of fuse circuit delay time, comprise power circuit, trigger shaping circuit, counter circuit and time base circuit; Wherein trigger shaping circuit, counter circuit is all connected with power circuit with time base circuit, the output terminal triggering shaping circuit is connected with counter circuit, another output terminal triggering shaping circuit is connected with retardation time of fuse circuit, the output terminal of retardation time of fuse circuit is connected with the input end triggering shaping circuit, and counter circuit is connected with time base circuit;
Power circuit is used for powering for triggering shaping circuit, counter circuit and time base circuit;
Trigger shaping circuit receive manually send manually start signal after its shaping is produced two paths of signals, a road is the retardation time of fuse enabling signal transporting to retardation time of fuse circuit, another road is the count enable signal transporting to counter circuit;
The time-base signal that counter circuit starts after receiving count enable signal time base circuit exports counts; Retardation time of fuse circuit receives trigger process after retardation time of fuse enabling signal;
At the end of time delay process, retardation time of fuse circuit produces time break, time break is transported to and is triggered shaping circuit and after amplitude limit and Shape correction, trigger shaping circuit export count stop signal to counter circuit, unison counter exports the number of time-base signal, obtains the delay time of retardation time of fuse circuit.
By said structure, the startup counted time-base signal by control counter circuit respectively and stopping, being reached and measure retardation time of fuse circuit sends the time interval (i.e. retardation time of fuse circuit delay time) time break object from input trigger pip to retardation time of fuse circuit.
As a kind of optimal way, described triggering shaping circuit adopts high-speed photoelectric coupler to carry out the transmission of retardation time of fuse enabling signal, count enable signal and count stop signal.
High-speed photoelectric coupler is in recent years along with the new unit that high speed communication technology occurs, it self to the delay time of the delay time of signal transmission much smaller than retardation time of fuse circuit, impact can not be brought on measuring accuracy.Therefore adopt high-speed photoelectric coupler to manually starting between signal and count enable signal, manually starting between signal and count stop signal and isolate, to between time break and count enable signal, isolate between time break and count stop signal, the structure of the duty of retardation time of fuse circuit, the antijamming capability improving whole measurement mechanism, simplified measurement device can be simulated truly.
As a kind of optimal way, described in manually start signal triggering shaping circuit in after Schmidt's shaping, export retardation time of fuse signal and count enable signal.
As a kind of optimal way, described time break exports count stop signal in triggering shaping circuit after Schmidt's shaping.
As a kind of optimal way, described counter circuit is six digit counter circuit.
As a kind of optimal way, described time base circuit exports 10MHz timebase frequency.
When employing six digit counter circuit and 10MHz timebase frequency time base circuit, when it is surveyed, scope is 0-99999.9uS.
Compared with oscilloscope measurement result, have higher resolution and precision, consistance and the repeatability of test result are also high compared with the result of oscilloscope measurement, and to measure more convenient simultaneously.
Based on same inventive concept, present invention also offers a kind of measuring method measuring the retardation time of fuse circuit delay time, use described measurement mechanism, comprise step
A. manually send and manually start signal to triggering shaping circuit;
B. trigger after shaping circuit receives artificial enabling signal and its shaping is produced two paths of signals, a road is the retardation time of fuse enabling signal transporting to retardation time of fuse circuit, another road is the count enable signal transporting to counter circuit;
C. the time-base signal that counter circuit starts after receiving count enable signal time base circuit exports counts, and retardation time of fuse circuit receives trigger process after retardation time of fuse enabling signal;
D. at the end of time delay process, retardation time of fuse circuit produces time break, time break is transported to and is triggered shaping circuit and after amplitude limit and Shape correction, trigger shaping circuit export count stop signal to counter circuit, unison counter exports the number of time-base signal, obtains the delay time of retardation time of fuse circuit.
As a kind of optimal way, trigger shaping circuit and adopt high-speed photoelectric coupler to carry out retardation time of fuse enabling signal, the transmission of count enable signal and the transmission of count stop signal.
As a kind of optimal way, described in manually start signal triggering shaping circuit in after Schmidt's shaping, export retardation time of fuse signal and count enable signal.
As a kind of optimal way, described time break exports count stop signal in triggering shaping circuit after Schmidt's shaping.
Compared with prior art, structure of the present invention is simple, easy to operate, and can simulate the duty of retardation time of fuse circuit truly, anti-interference is good, resolution and precision high, consistance and the repeatability of test result are high.
Accompanying drawing explanation
Fig. 1 is overall block-diagram of the present invention;
Fig. 2 is circuit construction of electric power figure of the present invention;
Fig. 3 is triggering shaping circuit structural drawing of the present invention;
Fig. 4 is counter circuit structure figure of the present invention;
Fig. 5 is time base circuit structural drawing of the present invention.
Wherein, 1 is power circuit, and 2 for triggering shaping circuit, and 3 is counter circuit, and 4 is time base circuit, and 5 is retardation time of fuse circuit.
Embodiment
As shown in Figure 1, an embodiment of measurement mechanism of the present invention comprises power circuit 1, triggers shaping circuit 2, counter circuit 3 and time base circuit 4; Wherein triggering shaping circuit 2, counter circuit 3 are all connected with power circuit 1 with time base circuit 4, the output terminal triggering shaping circuit 2 is connected with counter circuit 3, another output terminal triggering shaping circuit 2 is connected with retardation time of fuse circuit 5, the output terminal of retardation time of fuse circuit 5 is connected with the input end triggering shaping circuit 2, and counter circuit 3 is connected with time base circuit 4;
Power circuit 1 is for powering for triggering shaping circuit 2, counter circuit 3 and time base circuit 4;
Trigger shaping circuit 2 receive manually send manually start signal after its shaping is produced two paths of signals, a road is the retardation time of fuse enabling signal transporting to retardation time of fuse circuit 5, another road is the count enable signal transporting to counter circuit 3;
The time-base signal that counter circuit 3 starts after receiving count enable signal time base circuit 4 exports counts; Retardation time of fuse circuit 5 receives trigger process after retardation time of fuse enabling signal;
At the end of time delay process, retardation time of fuse circuit 5 produces time break, time break is transported to and is triggered shaping circuit 2 and after amplitude limit and Shape correction, trigger shaping circuit 2 export count stop signal to counter circuit 3, unison counter exports the number of time-base signal, obtains the delay time of retardation time of fuse circuit 5.
Described triggering shaping circuit 2 adopts high-speed photoelectric coupler to carry out the transmission of retardation time of fuse enabling signal, count enable signal and count stop signal.
The described signal that manually starts exports retardation time of fuse signal and count enable signal in triggering shaping circuit 2 after Schmidt's shaping.
Described time break exports count stop signal in triggering shaping circuit 2 after Schmidt's shaping.
Described counter circuit 3 is six digit counter circuit 3.
Described time base circuit 4 exports 10MHz timebase frequency.
The measurement mechanism described in one embodiment use of measuring method of the present invention, comprises step
A. manually send and manually start signal to triggering shaping circuit 2;
B. trigger after shaping circuit 2 receives artificial enabling signal and its shaping is produced two paths of signals, a road is the retardation time of fuse enabling signal transporting to retardation time of fuse circuit 5, another road is the count enable signal transporting to counter circuit 3;
C. the time-base signal that counter circuit 3 starts after receiving count enable signal time base circuit 4 exports counts, and retardation time of fuse circuit 5 receives trigger process after retardation time of fuse enabling signal;
D. at the end of time delay process, retardation time of fuse circuit 5 produces time break, time break is transported to and is triggered shaping circuit 2 and after amplitude limit and Shape correction, trigger shaping circuit 2 export count stop signal to counter circuit 3, unison counter exports the number of time-base signal, obtains the delay time of retardation time of fuse circuit 5.
Triggering shaping circuit 2 adopts high-speed photoelectric coupler to carry out retardation time of fuse enabling signal, the transmission of count enable signal and the transmission of count stop signal.
The described signal that manually starts exports retardation time of fuse signal and count enable signal in triggering shaping circuit 2 after Schmidt's shaping.
Described time break exports count stop signal in triggering shaping circuit 2 after Schmidt's shaping.
Referring to accompanying drawing 2, power circuit 1 provides power supply supply to whole measurement mechanism.Alternating current 220V is respectively by transformer T1, T2 step-down, and through overcommutation and filtering, respectively through U1, U2, U3 voltage stabilizing, obtain the stabilized power source of 3 groups of isolation: 5VA, 5VB, VDD, provide power supply supply respectively to triggering shaping circuit 2, counter circuit 3, time base circuit 4.
Referring to accompanying drawing 3, trigger shaping circuit 2 to input manually start signal and time break carries out Schmidt's shaping, the burr that removal manually starts in signal and time break also keeps level state, exports retardation time of fuse enabling signal, count enable signal and count stop signal simultaneously.
U4A and U4B, U4C and U4D form 2 rest-set flip-flops respectively, and when the circuit reset end ground connection of P1 terminal 3 pin, 2 rest-set flip-flops reset, all output low levels, high-speed photoelectric coupler PH1, PH2, PH3 not conducting.Retardation time of fuse enabling signal no-output, count enable signal and count stop signal all export high level, and counter is standby.
When manually starting of P1 terminal 1 pin holds ground connection, the rest-set flip-flop set of U4A and U4B composition, high-speed photoelectric coupler PH1 and PH2 conducting, retardation time of fuse enabling signal is connected over the ground, and retardation time of fuse circuit 5 is trigger process immediately.Count enable signal becomes low level, and counter circuit 3 starts to count time-base signal.
When retardation time of fuse circuit 5 timing process at the end, export time break, time break after amplitude limit, Shape correction by U4C and U4D form rest-set flip-flop set, high-speed photoelectric coupler PH3 conducting, count stop signal becomes low level from high level, counter stops immediately to time-base signal counting, thus obtains time delay.
Referring to accompanying drawing 4, counter circuit 3 is made up of 6 decade counters U13A, U13B, U14A, U14B, U15A, U15B and 67 sections BCD code translator U7-U12.Its major function is under the control of count enable signal and count stop signal, counts time-base signal, thus reaches the object measuring retardation time of fuse circuit 5 time delay.The counting region of counter is 0-999999.The cooperation cycle is the time base circuit 4 of 0.1uS, and its timing range is 0-99999.9uS.
Referring to accompanying drawing 5, time base circuit 4 oscillation frequency dividing circuit U17 produces 10MHz standard frequency, and its cycle is 0.1uS.
Claims (10)
1. measure the measurement mechanism of retardation time of fuse circuit delay time, it is characterized in that, comprise power circuit (1), trigger shaping circuit (2), counter circuit (3) and time base circuit (4); Wherein trigger shaping circuit (2), counter circuit (3) is all connected with power circuit (1) with time base circuit (4), the output terminal triggering shaping circuit (2) is connected with counter circuit (3), another output terminal triggering shaping circuit (2) is connected with retardation time of fuse circuit (5), the output terminal of retardation time of fuse circuit (5) is connected with the input end triggering shaping circuit (2), and counter circuit (3) is connected with time base circuit (4);
Power circuit (1) is for powering for triggering shaping circuit (2), counter circuit (3) and time base circuit (4);
Trigger shaping circuit (2) receive manually send manually start signal after its shaping is produced two paths of signals, a road is for transporting to the retardation time of fuse enabling signal of retardation time of fuse circuit (5), another road is for transporting to the count enable signal of counter circuit (3);
After counter circuit (3) receives count enable signal, the time-base signal started time base circuit (4) exports counts; Retardation time of fuse circuit (5) receives trigger process after retardation time of fuse enabling signal;
At the end of time delay process, retardation time of fuse circuit (5) produces time break, time break is transported to triggering shaping circuit (2) and after amplitude limit and Shape correction, is triggered shaping circuit (2) to counter circuit (3) output count stop signal, unison counter exports the number of time-base signal, obtains the delay time of retardation time of fuse circuit (5).
2. the measurement mechanism measuring the retardation time of fuse circuit delay time as claimed in claim 1, it is characterized in that, described triggering shaping circuit (2) adopts high-speed photoelectric coupler to carry out the transmission of retardation time of fuse enabling signal, count enable signal and count stop signal.
3. the as claimed in claim 1 or 2 measurement mechanism measuring the retardation time of fuse circuit delay time, is characterized in that, described in manually start signal after Schmidt's shaping, export retardation time of fuse signal and count enable signal in triggering shaping circuit (2).
4. the measurement mechanism measuring the retardation time of fuse circuit delay time as claimed in claim 1 or 2, is characterized in that, described time break exports count stop signal in triggering shaping circuit (2) after Schmidt's shaping.
5. the measurement mechanism measuring the retardation time of fuse circuit delay time as claimed in claim 1 or 2, it is characterized in that, described counter circuit (3) is six digit counter circuit (3).
6. the measurement mechanism measuring the retardation time of fuse circuit delay time as claimed in claim 1 or 2, is characterized in that, described time base circuit (4) exports 10MHz timebase frequency.
7. measure the measuring method of retardation time of fuse circuit delay time, it is characterized in that, use the measurement mechanism as described in any one of claim 1 to 6, comprise step
A. manually send and manually start signal to triggering shaping circuit (2);
B. trigger after shaping circuit (2) receives artificial enabling signal and its shaping is produced two paths of signals, a road is for transporting to the retardation time of fuse enabling signal of retardation time of fuse circuit (5), another road is for transporting to the count enable signal of counter circuit (3);
C. after counter circuit (3) receives count enable signal, the time-base signal started time base circuit (4) exports counts, and retardation time of fuse circuit (5) receives trigger process after retardation time of fuse enabling signal;
D. at the end of time delay process, retardation time of fuse circuit (5) produces time break, time break is transported to triggering shaping circuit (2) and after amplitude limit and Shape correction, is triggered shaping circuit (2) to counter circuit (3) output count stop signal, unison counter exports the number of time-base signal, obtains the delay time of retardation time of fuse circuit (5).
8. the measuring method measuring the retardation time of fuse circuit delay time as claimed in claim 7, it is characterized in that, trigger shaping circuit (2) and adopt high-speed photoelectric coupler to carry out retardation time of fuse enabling signal, the transmission of count enable signal and the transmission of count stop signal.
9. measure as claimed in claim 7 or 8 the measuring method of retardation time of fuse circuit delay time, it is characterized in that, described in manually start signal after Schmidt's shaping, export retardation time of fuse signal and count enable signal in triggering shaping circuit (2).
10. measure the measuring method of retardation time of fuse circuit delay time as claimed in claim 7 or 8, it is characterized in that, described time break exports count stop signal in triggering shaping circuit (2) after Schmidt's shaping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657430.5A CN105204320A (en) | 2015-10-12 | 2015-10-12 | Measuring device and method for measuring delay time of fuse delay circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510657430.5A CN105204320A (en) | 2015-10-12 | 2015-10-12 | Measuring device and method for measuring delay time of fuse delay circuit |
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| CN105204320A true CN105204320A (en) | 2015-12-30 |
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| CN201510657430.5A Pending CN105204320A (en) | 2015-10-12 | 2015-10-12 | Measuring device and method for measuring delay time of fuse delay circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500552A (en) * | 2016-10-24 | 2017-03-15 | 中国兵器装备集团自动化研究所 | A kind of fuse triggered time measurement apparatus |
| CN113515030A (en) * | 2021-08-16 | 2021-10-19 | 吉林省航虹科技有限公司 | Delay time measuring method for direct blasting of fuse powder |
| CN113985179A (en) * | 2021-10-29 | 2022-01-28 | 无锡盛景微电子股份有限公司 | Detonation full-state simulation detection system and method for electronic delay module |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940011632B1 (en) * | 1989-08-14 | 1994-12-22 | 대우전자주식회사 | Measuring apparatus in electronic part assembler of proximity fuses |
| CN1267364A (en) * | 1997-06-19 | 2000-09-20 | 恩赛-比克福德公司 | Electronic circuitry for timing and delay circuit |
| CN2564981Y (en) * | 2002-08-26 | 2003-08-06 | 中国人民解放军总装备部军械技术研究所 | Action time detector for electronic time fuse |
| CN201748868U (en) * | 2010-06-10 | 2011-02-16 | 北京北方邦杰科技发展有限公司 | Sampling-inspection device of electronic detonator |
| CN201748869U (en) * | 2010-06-10 | 2011-02-16 | 北京北方邦杰科技发展有限公司 | Electronic detonator random check system |
| CN202133339U (en) * | 2011-03-31 | 2012-02-01 | 四川久安芯电子科技有限公司 | Device for acquiring ID information of electronic detonator and controlling detonation |
| CN103134397A (en) * | 2013-02-08 | 2013-06-05 | 前进民爆股份有限公司 | Method and time-measurement instrument of optically measuring time delay of digital electronic detonator powder explosion detonation |
| CN205038450U (en) * | 2015-10-12 | 2016-02-17 | 江南工业集团有限公司 | Measurement device for measure detonator delay circuit delay time |
-
2015
- 2015-10-12 CN CN201510657430.5A patent/CN105204320A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940011632B1 (en) * | 1989-08-14 | 1994-12-22 | 대우전자주식회사 | Measuring apparatus in electronic part assembler of proximity fuses |
| CN1267364A (en) * | 1997-06-19 | 2000-09-20 | 恩赛-比克福德公司 | Electronic circuitry for timing and delay circuit |
| CN2564981Y (en) * | 2002-08-26 | 2003-08-06 | 中国人民解放军总装备部军械技术研究所 | Action time detector for electronic time fuse |
| CN201748868U (en) * | 2010-06-10 | 2011-02-16 | 北京北方邦杰科技发展有限公司 | Sampling-inspection device of electronic detonator |
| CN201748869U (en) * | 2010-06-10 | 2011-02-16 | 北京北方邦杰科技发展有限公司 | Electronic detonator random check system |
| CN202133339U (en) * | 2011-03-31 | 2012-02-01 | 四川久安芯电子科技有限公司 | Device for acquiring ID information of electronic detonator and controlling detonation |
| CN103134397A (en) * | 2013-02-08 | 2013-06-05 | 前进民爆股份有限公司 | Method and time-measurement instrument of optically measuring time delay of digital electronic detonator powder explosion detonation |
| CN205038450U (en) * | 2015-10-12 | 2016-02-17 | 江南工业集团有限公司 | Measurement device for measure detonator delay circuit delay time |
Non-Patent Citations (1)
| Title |
|---|
| 李道清: "引信延期时间智能测试系统", 《火工品》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106500552A (en) * | 2016-10-24 | 2017-03-15 | 中国兵器装备集团自动化研究所 | A kind of fuse triggered time measurement apparatus |
| CN113515030A (en) * | 2021-08-16 | 2021-10-19 | 吉林省航虹科技有限公司 | Delay time measuring method for direct blasting of fuse powder |
| CN113985179A (en) * | 2021-10-29 | 2022-01-28 | 无锡盛景微电子股份有限公司 | Detonation full-state simulation detection system and method for electronic delay module |
| CN113985179B (en) * | 2021-10-29 | 2022-08-05 | 无锡盛景微电子股份有限公司 | Detonation full-state simulation detection system and method for electronic delay module |
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Application publication date: 20151230 |