CN112987544A - Method for measuring ignition time of electric ignition head - Google Patents
Method for measuring ignition time of electric ignition head Download PDFInfo
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- CN112987544A CN112987544A CN202110122129.XA CN202110122129A CN112987544A CN 112987544 A CN112987544 A CN 112987544A CN 202110122129 A CN202110122129 A CN 202110122129A CN 112987544 A CN112987544 A CN 112987544A
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- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
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Abstract
The invention relates to a method for measuring the ignition time of an electric ignition head, which comprises the steps of providing a computer detection system for testing, adopting differential measurement, utilizing visible light generated when an electric ignition head initiating explosive device is ignited, picking up a visible light signal through a high-speed photoelectric sensor, comparing the visible light signal with an ignition current signal applied to the electric ignition head initiating explosive device through a computer system, and calculating the time difference value of the two signals to obtain accurate ignition time of the electric ignition head initiating explosive device. The invention has the advantages of high accuracy and precision of measuring the ignition time, convenient operation, safety and reliability. The system is simple to install and low in cost.
Description
Technical Field
The invention relates to the technical field of photoelectric detection, in particular to a method for measuring the ignition time of an electric ignition head.
Background
The traditional method for measuring the ignition time of the initiating explosive device of the electric ignition head mainly adopts the following methods:
(1) ignition current on-off method: the main disadvantage is that under the condition of rated ignition current, the bridge wire may not be fused, so that the ignition time is not accurately measured. The ignition time is measured by adopting a method for measuring the on-off of the current, the measurement accuracy is poor, the ignition time is obtained by taking the ignition current as the starting time and the ignition current loop as the ending time and calculating the time difference between the ignition current loop and the ending time. The measurement error sources are that the ignition current is delayed when being added to the electric ignition head initiating explosive device, and the ignition process is already completed when the bridgewire of the electric ignition head initiating explosive device is burnt off, so that the measured ignition time is longer than the actual time.
(2) The target line method: the main disadvantages are that the target line is bound in a complicated manner, and the target line may burn to cause inaccurate measurement. The method uses the initiating explosive device of the power supply ignition head and the ignition current as the starting time, and uses the burning and burning target line of the ignition head as the ending time to calculate the ignition time, and the measuring precision is higher than that of the ignition current on-off method. But the target line can not be burnt out because the target line can not be bound to the position, and the test reliability is low.
(3) An acoustic emission method: the main problem is that the sound propagation speed is slow and cannot reach the microsecond time measurement accuracy.
(4) High-speed imaging method: the main problems are that the measuring system is expensive and needs to be equipped with an X-ray source. The ignition time is calculated by adding ignition current to an initiating explosive device of an electric ignition head as a camera starting switch, judging a total frame image of a frame image burnt by the ignition head and converting the total frame image into the ignition time.
Disclosure of Invention
The invention aims to provide a method for measuring the ignition time of an electric ignition head, which greatly improves the measurement precision of the ignition time of initiating explosive devices of the electric ignition head on the premise of relatively low price, and has simple process, safety and reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for measuring ignition time of electric ignition head includes providing computer detection system for test, using differential measurement to utilize visible light generated by electric ignition head initiating explosive device when igniting to pick up said visible light signal by high speed photoelectric sensor, comparing visible light signal with ignition current signal on electric ignition head initiating explosive device by computer system to calculate time difference value of two signals to obtain accurate ignition time of electric ignition head initiating explosive device, setting ignition time as:
Δｔ=ｔ2-ｔ1，
wherein t 1 is the time for the electric ignition piece to reach the ignition current, and t 2 is the time of the optical signal obtained by burning the gunpowder.
The computer detection system comprises a computer system, a data acquisition unit, a high-speed photoelectric sensor, a direct current electronic load, a direct current power supply, a current sampling conversion unit and a power supply unit, wherein the data acquisition unit is a high-speed multi-channel data acquisition unit; during testing, the computer system controls the direct current power supply and the direct current electronic load according to the testing requirements of different types of electric ignition head initiating explosive devices, sets the current value and the pulse width of corresponding ignition current, acquires current signals on the electric ignition head initiating explosive devices through the current sampling conversion unit, acquires optical signals generated when the electric ignition head initiating explosive devices are ignited by the high-speed photoelectric sensor, processes the optical signals through the data acquisition unit, sends acquired data to the computer system, and accurately calculates the ignition current and the ignition time in the testing process.
The above protocol is further characterized in that the test steps are as follows:
firstly, controlling to apply a small current to an electric ignition head initiating explosive device through a computer system, wherein the small current is far smaller than the safety current tested by the electric ignition head initiating explosive device, reading back the sampling voltage value on the electric ignition head initiating explosive device, calculating the actual resistance value of the electric ignition head initiating explosive device, and calculating the voltage value required to be output by a direct-current power supply according to the requirement of the ignition current of the tested electric ignition head initiating explosive device, wherein the voltage value is not less than the ignition current, the actual resistance value of the electric ignition head initiating explosive device and the minimum required voltage at two ends of a direct-current electronic load;
then the computer system controls the direct current power supply and the direct current electronic load to output corresponding voltage and ignition current, synchronously recovers an ignition current signal added on an initiating explosive device of the tested electric initiating explosive device through the current sampling conversion unit, recovers an optical signal burnt by the fire cap through the high-speed photoelectric sensor, processes the optical signal through the data acquisition unit, sends the acquired data into the computer system, generates a current waveform and an optical signal waveform relative to a time axis on the computer system, and calculates the ignition time of the initiating explosive device of the electric initiating explosive device.
In the scheme, the direct current electronic load is an electronic load with high ascending/descending speed, so that the ascending/descending change of the current applied to the initiating explosive device of the electric ignition head is steeper.
The above scheme is further that the tested electric ignition head initiating explosive device is arranged on the movable sliding guide rail, the distance between the tested electric ignition head initiating explosive device and the high-speed optical sensor aperture is adjusted, and the fire cap of the tested electric ignition head initiating explosive device is fixedly arranged on the center height of the high-speed optical sensor aperture.
The above solution is further that the parameter requirements of the computer detection system are as follows:
the current measurement is divided into seven ranges: 30mA, 0.1A, 0.3A, 1A, 3A, 10A, 30A; the current measurement precision is better than +/-0.1% FS;
response time of high-speed photosensor: less than or equal to 1 mu S;
ignition response time measurement range: 0.1-10 mS; the measurement accuracy was. + -. 10. mu.S.
The invention adopts the high-speed photoelectric sensor, the reaction speed of the high-speed photoelectric sensor can reach microsecond level (mu S), the optical signal generated in the explosion process of the initiating explosive device of the electric initiating explosive device can be easily picked up, the optical signal is processed and amplified, and then the optical signal is compared with the current signal applied to the initiating explosive device of the electric initiating explosive device, and the time difference of the two signals is calculated, namely the ignition time of the initiating explosive device of the electric initiating explosive device. Compared with the traditional method for measuring the ignition time of the initiating explosive device of the electric ignition head, the method has the advantages of high accuracy and precision of measuring the ignition time, convenience in operation, safety and reliability. By controlling a direct-current power supply and a direct-current electronic load, sampling loop voltage and current through a high-speed and high-precision mutual inductor, acquiring optical signals of the burning of the electric fire head through a high-speed photoelectric sensor, and transmitting the optical signals to a computer system through a high-speed and high-precision data acquisition device, the very accurate ignition time of the electric fire head initiating explosive device is obtained. The invention has the advantages of high time measurement precision, good adaptability, simple system installation, low price and the like.
Description of the drawings:
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of the ignition timing measurement of the present invention;
fig. 3 is a waveform diagram of the time measurement of the present invention.
The specific implementation mode is as follows:
the conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, 2 and 3, which are schematic views of a preferred embodiment of the present invention, the present invention relates to a method for measuring an ignition time of an electric fire head, the method comprises the steps of providing a computer detection system for testing, using differential measurement, using visible light generated when an electric fire head initiating explosive device is ignited, picking up a visible light signal through a high-speed photoelectric sensor, comparing the visible light signal with an ignition current signal applied to the electric fire head initiating explosive device through a computer system, and calculating a time difference between the visible light signal and the ignition current signal to obtain an accurate ignition time of the electric fire head initiating explosive device, wherein the ignition time is as follows:
Δｔ=ｔ2-ｔ1，
wherein t 1 is the time of reaching the ignition current on the initiating explosive device of the electric mining fire head, and t 2 is the time of the optical signal obtained by burning the fire cap.
The computer detection system comprises a computer system 1, a data acquisition unit 2, a high-speed photoelectric sensor 3, a direct current electronic load 4, a direct current power supply 5, a current sampling conversion unit 6 and a power supply unit 7, wherein the data acquisition unit 2 is a high-speed multi-channel data acquisition unit. During testing, the computer system 1 controls the direct current power supply 5 and the direct current electronic load 4 according to the testing requirements of different types of initiating explosive devices of the electric ignition heads, and sets the current value and the pulse width of corresponding ignition current; the current sampling and converting unit 6 is used for collecting current signals flowing through the electric ignition head initiating explosive device 8, the high-speed photoelectric sensor 3 is used for collecting optical signals generated when the electric ignition head initiating explosive device 8 is ignited, the optical signals are processed by the data collector 2 and then sent to the computer system 1, and the computer system 1 accurately calculates the ignition current and the ignition time in the test process. Wherein the test steps are as follows:
firstly, controlling to apply a small current to an electric ignition head initiating explosive device through a computer system, wherein the small current is far smaller than the safety current tested by the electric ignition head initiating explosive device, reading back the sampling voltage value on the electric ignition head initiating explosive device, calculating the actual resistance value of the electric ignition head initiating explosive device, and calculating the voltage value required to be output by a direct-current power supply according to the requirement of the ignition current of the tested electric ignition head initiating explosive device, wherein the voltage value is not less than the ignition current, the actual resistance value of the electric ignition head initiating explosive device and the minimum required voltage at two ends of a direct-current electronic load;
then the computer system controls the direct current power supply and the direct current electronic load to output corresponding voltage and ignition current, synchronously recovers an ignition current signal added on the tested electric ignition head initiating explosive device through the current sampling conversion unit, recovers an optical signal burnt by the ignition cap through the high-speed photoelectric sensor, processes the optical signal through the data acquisition device, sends the acquired data into the computer system, generates a current waveform and an optical signal waveform (shown in figures 2 and 3) relative to a time axis on the computer system, and calculates the ignition time of the electric ignition head initiating explosive device.
The visible light generated when the electric ignition head initiating explosive device is ignited is utilized, the optical signal is picked up through the high-speed photoelectric sensor and is compared with an ignition current signal added on the electric ignition head initiating explosive device, and then the accurate ignition time of the electric ignition head initiating explosive device is obtained. The system greatly improves the measurement precision of the ignition time of the initiating explosive device of the electric ignition head on the premise of low price, can analyze, store and print the data collected by testing, and realizes the automation of the ignition time test process of the initiating explosive device of the electric ignition head and the intellectualization of data collection and processing.
Referring to fig. 1, the present invention further selects an electronic load with a high rising/falling speed for the dc electronic load, so that the rising/falling change of the current applied to the initiating explosive device of the electric igniter is steep, thereby more accurately measuring the ignition time. The tested electric ignition head initiating explosive device is arranged on the movable sliding guide rail, the distance between the tested electric ignition head initiating explosive device and the high-speed light sensor aperture is adjusted, and the test device is suitable for testing different electric ignition head initiating explosive device models. This by the fire cap fixed mounting of test electricity ignition head initiating explosive device on high-speed light sensor light ring central height, the accuracy and the precision of measuring the ignition time are promoted to the picking up and the amplification effect of assurance light that can the at utmost.
The parameter requirements of the computer detection system provided by the invention are as follows:
the current measurement is divided into seven ranges: 30mA, 0.1A, 0.3A, 1A, 3A, 10A, 30A; the current measurement precision is better than +/-0.1% FS;
response time of high-speed photosensor: less than or equal to 1 mu S;
ignition response time measurement range: 0.1-10 mS; the measurement accuracy was. + -. 10. mu.S.
After the subentry experiment, the forming machine is produced and delivered to certain military enterprises for the ignition test of the electric ignition head initiating explosive devices produced by the company, all technical indexes meet relevant requirements, and the practicability and the reliability of the invention are proved.
It is to be understood that the foregoing detailed description of the present invention has been provided only for the purpose of illustrating the technical spirit and features of the present invention, and the present invention is not limited thereto.
Claims (6)
1. A method for measuring ignition time of electric ignition head is characterized in that a computer detection system is provided for testing, differential measurement is adopted, visible light generated when an electric ignition head initiating explosive device is ignited is utilized, a visible light signal is picked up through a high-speed photoelectric sensor, then the visible light signal is compared with an ignition current signal applied to the electric ignition head initiating explosive device through the computer system, the time difference value of the two signals is calculated, and accurate ignition time of the electric ignition head initiating explosive device is obtained, wherein the ignition time is as follows:
Δｔ=ｔ2-ｔ1，
wherein t 1 is the time for the electric ignition piece to reach the ignition current, and t 2 is the time of the optical signal obtained by burning the gunpowder.
2. The method for measuring the ignition time of the electric ignition head according to claim 1, wherein the computer detection system comprises a computer system, a data acquisition unit, a high-speed photoelectric sensor, a direct current electronic load, a direct current power supply, a current sampling conversion unit and a power supply unit, wherein the data acquisition unit is a high-speed multi-channel data acquisition unit; during testing, the computer system controls the direct current power supply and the direct current electronic load according to the testing requirements of different types of electric ignition head initiating explosive devices, sets the current value and the pulse width of corresponding ignition current, acquires current signals on the electric ignition head initiating explosive devices through the current sampling conversion unit, acquires optical signals generated when the electric ignition head initiating explosive devices are ignited by the high-speed photoelectric sensor, processes the optical signals through the data acquisition unit, sends acquired data to the computer system, and accurately calculates the ignition current and the ignition time in the testing process.
3. The method for measuring the ignition time of the electric igniter according to claim 2, wherein the testing steps are as follows:
firstly, controlling to apply a small current to an electric ignition head initiating explosive device through a computer system, wherein the small current is far smaller than the safety current tested by the electric ignition head initiating explosive device, reading back the sampling voltage value on the electric ignition head initiating explosive device, calculating the actual resistance value of the electric ignition head initiating explosive device, and calculating the voltage value required to be output by a direct-current power supply according to the requirement of the ignition current of the tested electric ignition head initiating explosive device, wherein the voltage value is not less than the ignition current, the actual resistance value of the electric ignition head initiating explosive device and the minimum required voltage at two ends of a direct-current electronic load;
then the computer system controls the direct current power supply and the direct current electronic load to output corresponding voltage and ignition current, synchronously recovers an ignition current signal added on an initiating explosive device of the tested electric initiating explosive device through the current sampling conversion unit, recovers an optical signal burnt by the fire cap through the high-speed photoelectric sensor, processes the optical signal through the data acquisition unit, sends the acquired data into the computer system, generates a current waveform and an optical signal waveform relative to a time axis on the computer system, and calculates the ignition time of the initiating explosive device of the electric initiating explosive device.
4. The method as claimed in claim 2 or 3, wherein the DC electronic load is selected from electronic loads with high rise/fall speed, so that the rise/fall of the current applied to the electric igniter workpiece is relatively steep.
5. The method as claimed in claim 3, wherein the primer of the electric primer is mounted on a movable sliding guide for adjusting the distance from the aperture of the high-speed optical sensor, and the primer of the primer is fixedly mounted on the center of the aperture of the high-speed optical sensor.
6. The method as claimed in claim 2, wherein the computer detection system parameters require the following:
the current measurement is divided into seven ranges: 30mA, 0.1A, 0.3A, 1A, 3A, 10A, 30A; the current measurement precision is better than +/-0.1% FS;
response time of high-speed photosensor: less than or equal to 1 mu S;
ignition response time measurement range: 0.1-10 mS; the measurement accuracy was. + -. 10. mu.S.
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| JPS5773647A (en) * | 1980-10-27 | 1982-05-08 | Nippon Soken Inc | Preignition detector for spark ignition engine |
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| CN101484826A (en) * | 2006-07-04 | 2009-07-15 | 倍加福有限责任公司 | Method and apparatus for optoelectronic contactless range finding using the transit time principle |
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| CN105890462A (en) * | 2016-04-07 | 2016-08-24 | 江资成 | Ignition time measuring system of electric ignition head |
| CN108195589A (en) * | 2017-12-14 | 2018-06-22 | 中国航发沈阳发动机研究所 | A kind of starting ignition time measurement device |
| CN111120151A (en) * | 2019-12-19 | 2020-05-08 | 南京理工大学 | Circuit and method for measuring ignition delay time of solid propellant |
| CN111998741A (en) * | 2020-09-25 | 2020-11-27 | 中北大学 | Non-contact ignition system testing arrangement |
-
2021
- 2021-01-29 CN CN202110122129.XA patent/CN112987544B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5773647A (en) * | 1980-10-27 | 1982-05-08 | Nippon Soken Inc | Preignition detector for spark ignition engine |
| EP1522907A2 (en) * | 2003-10-08 | 2005-04-13 | Hitachi, Ltd. | Control device with time measuring function |
| CN101484826A (en) * | 2006-07-04 | 2009-07-15 | 倍加福有限责任公司 | Method and apparatus for optoelectronic contactless range finding using the transit time principle |
| CN105659875B (en) * | 2010-11-09 | 2014-04-09 | 北京航天长征飞行器研究所 | A kind of Microsecond grade multi-channel synchronous burst time high-precision measuring method |
| CN105372039A (en) * | 2015-10-30 | 2016-03-02 | 苏州优康通信设备有限公司 | Action time testing system for electric igniter |
| CN105890462A (en) * | 2016-04-07 | 2016-08-24 | 江资成 | Ignition time measuring system of electric ignition head |
| CN108195589A (en) * | 2017-12-14 | 2018-06-22 | 中国航发沈阳发动机研究所 | A kind of starting ignition time measurement device |
| CN111120151A (en) * | 2019-12-19 | 2020-05-08 | 南京理工大学 | Circuit and method for measuring ignition delay time of solid propellant |
| CN111998741A (en) * | 2020-09-25 | 2020-11-27 | 中北大学 | Non-contact ignition system testing arrangement |
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