Method for definition of moving surface asymmetry

FIELD: physics, measurements.

SUBSTANCE: invention is related to the field of metering equipment, namely to measurement of moving surface parametres. Charge of explosive substance is initiated with the help of lens or detonation distributor on surface, which is speeded up by explosion products to velocity that causes glow of shock wave in front of it. Receiver of the same shape closed by screen is installed on motion route. Two or more groups of electro-optical detectors are installed in receiver along normal line to moving surface on different bases from initial position of surface. Surface of screen inverted to electro-optical detectors in process of motion interacts with their ends, besides, at the same time electric and light signals are generated, which are supplied to recorders. Recorders measure time of moving surface approach to the end of every detector. Diversity is defined by difference of times of electric and light signals in every group of detectors.

EFFECT: makes it possible to improve reliability and accuracy of measurements of time intervals in complex expensive experiments.

4 dwg

 

The invention relates to the field of measuring technique, namely the measurement of the parameters of the moving surfaces.

When assessing the symmetry and dynamics of surfaces is traditionally used measurement method based on the use of contact sensors that form when approaching the sample surface electrical signals.

In the field of gas-dynamic researches during a particularly challenging explosive experiments exhibited the requirement for measurement of time intervals, at least two independent techniques based on different physical principles.

The closest to the technical nature of the claimed method is a method of determining the moving speed of the aluminum plate radio-interferometric method and using the four groups of contact sensors (KD), which are mounted on different specified databases from the original position of the surface, with each sensor in the group set normal to the moving surface and with the possibility of interacting with it, measure the time of flight of the moving surface and the difference in the moment of interaction with each of the sensors on the electric signals (see report On the impact of the shock-compressed layer to the welded plate on the measurement of its speed radiointerferometricheskaya", authors: Enjagginb, Vmolsky, Averianov, book of abstracts international conference "IX Kharitonov topical scientific readings", 12-16 March 2007, Saarow: RFNC-VNIIEF, 2007, - 375). The above method is adopted as a prototype.

The disadvantages of this method are the limited functionality that does not allow duplicate measurements of asymmetry and dynamics of moving spherical, cylindrical, parabolic, or other complex shapes of surfaces.

Problem to be solved is to provide a method of determining the velocity and asymmetry of the moving surface with enhanced functionality through the use of two independent methods: contact and fiber.

The technical result of the invention is to improve the reliability and accuracy of measurements of time intervals when conducting complex and expensive gas-dynamic experiments.

The technical result is achieved in the method of determining the velocity and asymmetry of the moving surface, based on the use of at least two groups of sensors, each of which are installed on the same set bases from the original position of the surface, with each sensor in the group set normal to the moving surface and with the possibility of interacting with it, measure the time of flight of the moving surface and the difference in the moment of interaction with each of the sensors on the electric signals, which is new is that dispersing surface up to speed, causing the illumination of the air in the shock wave in the interaction with sensors, as the sensors use electro-optical sensors for the simultaneous formation of the electrical and light signals in the moments of interaction with the moving surface, simultaneously with the electrical signals additionally register and light signals, each of which is used for time measurement surface interaction with electro-optical sensors, and the difference of approach of the moving surface is determined by the difference of times each group of sensors for electrical and light signals.

Use in the inventive method, electro-optical sensors (EDI) allows you to simultaneously form an electrical and light signals in the moments of interaction with the moving surface, resulting in the possibility arose of determining the velocity and asymmetry of the moving surface by two independent methods based on different physical principles.

Figure 1 presents a device that implements the inventive method; figure 2 - design of the electro-optic sensor; figure 3 - waveform obtained in the experiment; figure 4 - response times EDI and KD obtained by independent methods: contact fiber optic.

The device for implementing the method comprises: detonator 1, the lens 2 CENTURIES, checker BB 3, the steel plate 4, a screen 5, a receiver 6, an electro-optical sensors 7.

The method is implemented as follows.

The explosive charge is initiated by means of a lens 2 or detonation of the dispenser on a flat, spherical or other surface. The products of the explosion are dispersing plate 4 or the shell of a corresponding form, in the path of movement which set the receiver 6 of the same shape, closed the screen 5. In the receiver 6 is normal to the moving surface are installing two or more groups of electro-optical sensors 7 on different bases from the original position of the surface. The screen surface 5 facing the electro-optical sensors 7, the motion interacts with their ends with the simultaneous formation of the electrical and light signals are received by the registrars. Loggers measure the time of flight of the moving surface to the end of each sensor. The difference is determined by the difference of times of electrical and light signals in each group of sensors.

Checking method implemented in the experiment using the device represented in figure 1. The lens 2 CENTURIES initiated by detonator 1. The lens was created in piece 3 CENTURIES of TG 5/5 planar detonation wave. The products of the explosion has accelerated the steel the plate 4, which struck on the screen 5. Under the screen 5 set the receiver 6 with electro-optical (EDI) and contact sensors (KD) 7. Because the speed of the plate was known before the experiment was set one group EDI and two groups of KD.

In the experience used electro-optical sensors, the design of which is shown in figure 2. The sensor was made of a Nickel tube 8 ⌀0.35 mm, which was glued with epoxy adhesive to the optical fiber 9 type MM/125/250.

To the tube was podpisali copper wire 10 with a diameter of 0.2 mm, which in experience had applied voltage of 150 V, the end face of the sensor polished. The sensors were installed in the holes of the receiver 6 and fixed with epoxy glue.

Light and electrical signals from the four EDI register oscilloscope with a sampling frequency of 1 NS and a bandwidth of 500 MHz. Light signals with the remaining 20 EDI register measuring complex with an optical input and an electrical signal is parallel to the measuring complex with optical inputs (IR) and measuring complex with electrical inputs (IKE). The electrical signals from the 12 KD was detected, IKE.

Start recording equipment was carried out simultaneously with the launch of disruptive installation. High-voltage pulse subversive installation cable gave the detonator 1 (ED) the former is erimentale Assembly. At the end of the second cable of the same length, connected to subversive installation, installed spark arrester, which is opposite the spark gap placed two additional optical sensor. Light pulse of "0" from the first optical sensor in the optical line of polymer optical fiber POF ⌀1 mm 24 m in length were received by the ICO. Light pulse from the second optical sensor similar to the optical line has entered the high-speed analog opto-electronic Converter (AOAP). The electrical signal from AAP amplitude of 1.7 V and a duration of the front ~10 NS was applied as a zero signal "0" on all oscilloscopes, IKE. The electrical equivalent of the optical "0" pulse from the first optical sensor ahead of the light signal from the second optical sensor, the recorded IR 15 NS. This shift was taken into account when processing the results.

The light pulses generated in the air gap before EDI, passed along the lines of the optical cable type OK-50 optical inputs IR. The electrical signals from EDI and KD were received by the registrars by three 25-channel measurement of cable type RK50-2-11 length 55÷56 PM

In the experience of the registered information with 24 electro-optical and 12 contact sensors. Chart power light signals from the four EDI and electrical signals are fixed is installed in the experience, shown in figure 3. Time counted from the zero signal "0"which wound up on the first channels of all oscilloscopes.

Response times EDI and KD all recording devices is shown in figure 4.

The average response time contact EDI registered IR, is 35,8 ISS (the difference Δt is 0.25 μs), the same is registered, IKE, is 35,88 ISS (difference - 0,21 ISS). The discrepancy between these results can be explained by different thresholds of measuring channels complexes, channels IR is more sensitive.

The average response time of the first group KD, consisting of two sensors mounted on the other base, is 35,6 ISS. The average response time of the second group of 10 KD, registered, IKE, is 35,87 ISS (Δt-0,07 ISS). The average response time of 24 EDI and 10 KD installed on one base, almost the same. The velocity of the plate, certain times of actuation KD, amounted to 3 km/s

The average response time optical and contact EDI registered oscilloscopes, coincided and amounted to tcp=35,74 ISS (Δt-0,09 ISS). This time differs from tcpregistered, IKE, 0.14 ISS and 0.06 μs from tcpregistered IR.

The average response time of the optical EDI registered IR, is 35,63 m is C (Δt-0,2 μs), this time differs from tcpregistered oscilloscopes, Δt=0,13 ISS in the direction of advance. This is due to the sloping part of the front light pulses, which led to an earlier trigger channels IR (threshold channels - 5...10 µw).

The average time of movement of the plate, registered IR optical part of the EDI ~0,14 ISS less than the average time recorded in both complexes with the contact part of the EDP. This is due to the presence of the podium at the front of the light signals.

Compared with the prototype of this method allows the measurement of the dynamics and asymmetry of movement of the surfaces with two independent techniques based on different physical principles, which improves the reliability and accuracy of measurement of time intervals in complex, costly experiments.

How to determine the asymmetry of the moving surface, based on the use of at least two groups of sensors, each of which are installed on the same set bases from the original position of the surface, with each sensor in the group set normal to the moving surface and with the possibility of interacting with it, measure the time of flight of the moving surface and the difference in the moment of interaction with each of the sensors on electric is ignall, characterized in that the dispersing surface to a velocity that causes the glow of a shock wave in front of her when interacting with the sensors, as the sensors use electro-optical sensors for the simultaneous formation of the electrical and light signals in the moments of interaction with the moving surface, simultaneously with the electrical signals additionally register and light signals, each of which is used for time measurement surface interaction with electro-optical sensors, and the difference of approach of the moving surface is determined by the difference of times each group of sensors for electrical and light signals.



 

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