339results about "Measurement of explosion force" patented technology

A gauge for measuring the force required to discharge a firearm by pulling its trigger includes a housing and a rod including a trigger hook portion at a distal end thereof for engaging the trigger. A load cell is connected to the housing and to a proximal end of the rod such that the load cell generates an electrical signal in response to forces on the rod as the housing is pulled while the trigger hook portion is engaged with the trigger. The magnitude of the electrical signal is proportional to the forces on the rod. A microcontroller receives the electrical signal and calculates a force value based thereon. The microcontroller also continuously monitors the forces on the rod and identifies a trigger pull value of the firearm as being the maximum force on the rod until pulling on the housing is ceased once the trigger of firearm has released.

The firearm support device includes one or more “beanbags” directly mounted to a rifle stock that can be moved between a secured transportation position held against the stock and a support position suspended beneath the stock. The support device includes a stock attachment and one or more beanbags pivotally connected to the stock attachment. The stock attachment includes cinch and stirrup straps that secure the support devices to the stock and prevent it from inadvertently sliding up the stock. The bean bags are constructed of cloth pouches filled with a granular substance. The beanbags are sewn directly to the cinch strap or connected to the cinch strap by a slide buckle that rides along a rail strap sewn to a beanbag. The beanbags are securely held against the sides of the rifle stock in the transportation position by elastic cords, buckles, snaps, hook and loop fastening patches or other connection mechanisms.

Adjustable firearm supports, and more specifically adjustable bipods, are disclosed herein. In one embodiment, a firearm support includes a stock mount assembly configured to support a forestock of the firearm and an attachment assembly carried by the stock mount assembly. The attachment assembly is configured to releasably attach to the forestock of the firearm. The firearm support also includes first and second legs operably coupled to the support plate. Each leg is pivotable between a stowed position and an extended position. In the stowed position the legs are generally parallel to a longitudinal axis of the firearm, and in the extended position the legs are generally transverse to the longitudinal axis of the firearm.

A passive blast pressure sensor for detecting blast overpressures of at least a predetermined minimum threshold pressure. The blast pressure sensor includes a piston-cylinder arrangement with one end of the piston having a detection surface exposed to a blast event monitored medium through one end of the cylinder and the other end of the piston having a striker surface positioned to impact a contact stress sensitive film that is positioned against a strike surface of a rigid body, such as a backing plate. The contact stress sensitive film is of a type which changes color in response to at least a predetermined minimum contact stress which is defined as a product of the predetermined minimum threshold pressure and an amplification factor of the piston. In this manner, a color change in the film arising from impact of the piston accelerated by a blast event provides visual indication that a blast overpressure encountered from the blast event was not less than the predetermined minimum threshold pressure.

A system and method for collecting data on small-arms usage in the form of a device which is mounted to the firearm so as to be able to sense at least an impulse in the firearm due to firing. The device is mounted to the gun so as to detect impulses due to firing. A processor accepts impulse signals from the sensor, and uses either a hold-off delay or a windowing time to determine and store information related to the firing of the firearm. This information may be any combination of temperature, firing rate, firing intervals and time data for subsequent analysis, and, optionally, information identifying the weapon to which the device is attached. The device preferably has an interface to transfer data from the device to a computer or other data collection device.

An apparatus is configured for inclusion in an arrow. In one embodiment, the apparatus includes a sensor configured to provide data concerning one or more flight characteristics of the arrow in flight and a communication link coupled to the sensor, the communication link configured to communicate the data to a device external to the arrow.

Methods and devices for a miniature, ultra-low power impact recorder for detecting, quantifying and recording the energy of an explosive blast or ballistic projectile impact. In one embodiment, the impact recorder can included a sensor comprised of an array of electromechanical resonators that is sensitive to the vibrations produced in selected, discrete frequency ranges that approximate the spectral signature characteristics of the shockwave resulting from the ballistic impact event, even after traveling through impacted material or body tissues.

According to one embodiment, a method is provided for calculating, by an activity monitor comprising one accelerometer, a raw activity energy expenditure data based on movement by a user. The method includes determining if the raw activity energy expenditure data is associated with a high intensity physical activity, wherein the high intensity physical activity causes the raw activity energy expenditure data to differ from an expected activity energy expenditure data. The method includes calculating a corrected activity energy expenditure data, if the raw activity energy expenditure data is associated with the high intensity physical activity, based on the raw activity energy expenditure data, wherein the corrected activity energy expenditure data is substantially identical to the expected activity energy expenditure data.

A device for collecting data on small-arms usage that senses when a shot has been fired from a gun using its acceleration, acoustic noise or RF emissions; measures the interval between shots so that the firing rate may be determined; measures the time at which each shot has been fired; measures the temperature of the barrel when each shot is fired; stores any combination of temperature, firing rate, firing intervals and time data for subsequent analysis and has an electrical interface to transfer data from the device to a computer or other data collection device.

A tripod assembly having multiple interchangeable accessories for use in supporting a firearm or other device includes mounting couplers for releasably securing the assembly to an attachment point on a device to be supported, such as the forearm of a rifle, mounting brackets that are not affixed to the device to be supported, and threaded fasteners adapted for connection to standard threaded sockets for supporting devices such as cameras, spotting scopes and the like. The tripod assembly has a substantially planar, generally triangular tripod base including three sides terminating in, and defining, first, second and third vertices carrying respective first, second and third telescoping support legs.

An apparatus for counting and storing a number of rounds fired from a gun includes a microcomputer; a non-volatile memory connected to the microcomputer; and at least one piezoelectric transducer connected to the microcomputer and mounted on the gun, the at least one piezoelectric transducer comprising a power source that generates power during operation of the gun. The piezoelectric transducer may also sense the firing of the gun.

A rest for cleaning a rifle and for sighting a scope, a stock, and a bore of the rifle. The rest includes a base, a vise assembly, a fore-end support assembly, and an elevator assembly. The vise assembly adjusts for different-length rifles and clamps the stock of the rifle therein. The fore-end support assembly adjusts for the different-length rifles and supports the fore-end of the rifle thereon. The elevator assembly adjusts for the different-length rifles and supports the barrel of the rifle therein. The rest further includes a lapping tool, alignment tools, a stock alignment tool, a bore sighting tool, a centering tool, and a set of diopters. The lapping tool insures smoothness and proper interior profile of the mounting rings for a scope. The alignment tools insures that the scope fits properly without any binding or protrusions. The stock alignment tool lines up the stock of the gun so the gun is leveled. The bore sighting calibrates the scope. The centering tool cradles, centers, and supports the gun. A respective diopter is attached to an objective end of the scope to increase depth of field when a target is so close that the scope does not focus clearly.

There is provided a blast occurrence apparatus for indicating the occurrence of a significant and potentially injury causing blast overpressure. The apparatus comprises a base, a housing and blast indication means to provide a visual indication that a significant blast has occurred. A blast indication means may be implemented using a rupturable membrane or a layer of microencapsulated paint or dye material, dimensioned to rupture at the desired overpressure level. The device is configured to withstand acceleration or shock resulting from impact.

Embodiments of the present technology are directed to systems and methods for measuring projectile muzzle velocity. A muzzle velocity sensor measures an acceleration as well as a set of events occurring within the barrel of the firearm upon a shot being fired. Using the measured data, a muzzle velocity is calculated. The muzzle velocity sensor is used externally to the firearm, requiring no changes to the firearm or the projectile.

The invention discloses a water shooting pressure measurement sensor. The sensor mainly comprises a piezocrystal assembly and an amplifying circuit, wherein the amplifying circuit is arranged in a shell; the piezocrystal assembly is connected with the amplifying circuit through a connecting lead; the amplifying circuit is connected with a signal output cable; the piezocrystal assembly is coated in sound-transparent silicone rubber by an epoxy resin; a graphite layer is coated on the external surface of the sound-transparent silicone rubber; the amplifying circuit is coated by an insulated tape and is packaged in the shell by elastic silicone rubber; one end of the shell is connected with a top cap; the output cable passes through the top cap to be connected with the amplifying circuit; and a screw for fixing the signal output cable is arranged on the shell. The sensor has a simple structure, cannot be easily shot and damaged by explosive products, and can be used for measuring water shooting pressure in a complex environment; and the output cable is reliably connected.

The invention provides a subaqueous explosion pressure measurement device based on an improved Hopkinson bar, and is used for measuring shock wave pressure and bubble jet pressure of subaqueous shortest field explosion. The subaqueous explosion pressure measurement device comprises an energy absorption and recovery device which absorbs all the subaqueous explosion shock wave pressure pulse kinetic energy falling into flying sheets; a shock wave load separation device which is used for transferring all the subaqueous explosion shock wave pressure pulse in the improved Hopkinson bar to the flying sheets so as to realize shock wave load separation; and an improved Hopkinson bar measurement element which is used for amplifying subaqueous explosion shock wave pressure and bubble jet pressure signals and realizing shock wave load separation with the help of the shock wave load separation device so as to finally realize time-space separated measurement of the shock wave pressure and the bubble jet pressure of subaqueous shortest field explosion.

The invention belongs to the field of underwater explosion measuring equipment, and particularly relates to a piezoelectric film type sensor used for underwater explosion pressure measurement and a measuring method thereof. According to the sensor, a sandwich type piezoelectric film pressure gage is placed in a hose filled with silicone oil, the two ends of the hose are sealed through plastic plugs, an extension leading wire is led out from a thin through hole of the upper plastic plug, and a flexible fine wire is wound on the outer wall face of the hose. The measuring method includes the steps that (1) the sensor is hung in the same horizontal line with an underwater explosion explosive cylinder through a counter weight, a resistor is connected to the sensor in parallel, a piezoelectric film and the resistor form a powered loop through an extension electrode leading wire, and an oscilloscope is arranged on the loop; (2) after explosives are ignited, voltage signals at the two ends of the resistor are recorded; (3) the quantity of electric charges of the piezoelectric film is obtained through calculation according to the voltage signals, and an explosive shock wave pressure numerical value is acquired through conversion. The piezoelectric film type sensor can be used for directly measuring the pressure change rate of underwater explosion, and is wide in pressure measuring range, convenient to process and low in cost.

The invention discloses a method for evaluating the explosive power in an explosive based on a shock wave overpressure and a quasi-static pressure. Evaluation test of the explosive power on the explosive to be evaluated and TNT, having the same mass, is carried out, an explosive power evaluation parameter kind, a measurement point laying technology and a data processing technology are determined according to the explosion characteristics in the explosive, and the method for calculating the equivalent TNT of the explosive power based on the shock wave overpressure and the quasi-static pressureis established. The method breaks through the shock wave overpressure used as a single index of the explosive power of the explosive, can completely reflect the explosive power characteristics in theexplosive, achieves a scientific and reasonable evaluation result, and can be used for selecting an explosive formula and evaluating the explosive power.

A Joint Combined Aircrew Systems Tester (JCAST) that can be used to test aircrew integrated life support equipment currently authorized for use by aircrew members of the Air Force, Navy and Army. The JCAST will be capable of Chemical / Biological seal testing of all the Joint Service Aircrew Mask (JSAM) variants including the Type 2 JSAM for high performance aircraft. Like traditional Testers, the JCAST is capable of Performance and Fit Testing of masks at pressure levels, including COMBAT EDGE (Combined Advanced Technology Enhanced Design “G” Ensemble), consistent with aircraft supply levels. The JCAST provides an apparatus and technique for accurately measuring a leak rate for an elastic body such as a chemical mask at 0.5 sccm at 6 IWG. The JCAST is portable and light weight while providing novel leak testing using pressure decay.

An apparatus as provided for measuring acceleration of a person's head or other object. The apparatus comprises a sensor for sensing acceleration and a controller for controlling recording of data resulting from the sensed acceleration due to an explosive force. The controller is adapted to determine whether or not to enable recording of the data based on the sensed acceleration. A data receiver is provided to receive the sensed acceleration data from the sensing means, and requires electrical power to enable data to be received thereby. The controller controls electrical power to the receiver so that if the sensed acceleration reaches or exceeds a predetermined value, electrical power to the data receiver is enabled. The recorded acceleration data may be used for injury analysis.

The present invention discloses a method and a device for measuring the explosion shock wave energy of a combustible gas. Sheet-like barriers are arranged in an explosion case, and the explosion case is filled with the combustible gas, so that the combustible gas in the explosion case reaches an explosion concentration. A gas stirrer is started to make the combustible gas be distributed in the case evenly, the combustible gas is ignited and detonated in the middle of the barrier, at the same time, a high-speed camera is used to shoot the motion state of the barrier continuously, and a computer is connected to record and process the experimental data, so that the explosion shock wave energy of the combustible gas is obtained. According to the present invention, the energy generated by the explosion shock wave of the combustible gas is calculated by utilizing the motion acceleration and speed of the exploded barrier and according to the fluid kinematics and the newton's laws of motion. The method and device of the present invention possess important guidance meaning for determining the damaging range of the combustible gas explosion disaster in reality and adopting effective prevention and control measures. By the technical scheme of the present invention, the operation steps are simple, the measurement result is visual and accurate, and the structure of the explosion case is simple and is similar to the actual situation.

The invention provides a method for measuring the explosion shock wave field strength and a special-purpose pressure tank that is used for testing an explosion pressure field. Compared with a traditional pressure sensor measurement method, the provided measuring method is visual, is easy to operate and is more economical. According to a concrete technical scheme, the pressure tank is composed of a membrane, a tank cover and tank body. The tank cover is open and the upper end of the tank cover is provided with a flange. The membrane is a plastic material and is a direct action object at a pressure field; and the deflection of the membrane reflects a pressure level. The tank cover and the tank body are in threaded connection; and the membrane is clampedly placed between a lower end surface of the tank cover flange and an upper end surface of a tank body opening. According to the measuring method provided in the invention, changes of a volume inside the pressure tank before and after explosion as well as before and after deformation of the membrane are measured, so that a pressure filed of an explosion shock wave can be measured.

The invention relates to a non-contact type impact wave hyperpressure measuring method. A high-speed photographic device and a loading structure are triggered synchronously, the high-speed photographic device is used for shooting the whole process of blasting of the loading structure; according to the shooting speed set by the high-speed photographic device, two adjacent frames of images shot by the high-speed photographic device before and after a given moment are analyzed, the moving speed of the wave front of impact waves generated by blasting of the loading structure is determined; according to impact wave compatibility relation and an impact wave adiabatic equation of polytropic gases, corresponding impact wave hyperpressure is obtained by computing through the moving speed of the wave front of the impact waves. According to the non-contact type air impact wave hyperpressure measuring method, errors brought by a traditional measuring method are avoided, measuring is safe, data are reliable, operation is convenient, and measured data can be verified by high-speed video playback.

A test assembly for building a safety profile and a sensitivity profile of an explosive, by impacting the test assembly with a projectile. The safety profile of the explosive is built by determining a detonation threshold of the explosive in reaction to the projectile. The sensitivity profile is built by measuring a pressure difference between pressures acquired by the top sensor and the bottom sensor, resulting from a shock wave that travels through the explosive.

The invention discloses an internal explosion experimental device for a cylindrical double-chamber structure. The experimental device is composed of a front end cover 101, an explosion chamber side wall 102, an observation chamber side wall 201, a rear end cover 202, a bullet-proof glass observation window 203, a test sheet 3, a charging support rod 103, and a sensor mounting component 5. The front end cover 101 is installed at the head end of the explosion chamber side wall 102. The rear end cover 202 is installed at the tail end of the observation chamber side wall 201. The tail end of the explosion chamber side wall 102 and the head end of the observation chamber side wall 201 are in sealing connection through a flange structure. The test sheet 3 is clamped in the middle of the flange to form a closed double-chamber structure, namely, a closed explosion chamber 1 and a closed observation chamber 2. By using the internal explosion experimental device of the invention, the explosion load propagation law of the ship cabin and the damage characteristic of the cabin grillage structure can be researched and experimented under the condition of internal explosion, and the problem that the existing experimental device has poor test data repeatability and consistency is solved.

A ballistic test projectile includes a nose section comprising a windshield and aft of the windshield, an ogive; a body section aft of the nose section, the body section comprising a generally cylindrical body connected to the ogive; a base section aft of the body section, the base section comprising a base adapter connected to the body and a base bottom connected to the base adapter; a base pressure gage disposed in the base bottom; at least one side pressure gage disposed in the body; and an electronics cup disposed in the body, the electronics cup comprising a battery cup, a signal conditioning cup, a multiplexer cup, an accelerometer cup and a transmitter cup.

A system for precisely measuring muzzle exit velocity of a “muzzle loaded” mortar projectile fired from a mortar tube using two back-biased Hall effect sensors for projectile gas ring channel detection. The system includes a back-biased Hall effect sensor block, a digital resolver electronic circuit and a computer software interface. The back-biased Hall effect sensors are located in a calibrated sensor block attached to a mortar tube. As the projectile metal casing passes a face of the sensors, the sensors trigger and release, providing two electronic pulses. The pulse edges are captured in the resolver electronics, containing a discriminator circuit for filtering all input pulses to distinguish between a projectile loading event and a projectile firing event. Once a valid firing event is detected, an output of precision timers is presented serially to a computer where it is processed and displayed by a computer software interface.

The invention discloses an effect target device for shock wave pressure measurement of a target of a moving explosive field. The effect target device is characterized by comprising a base, an intermediate body, a response diaphragm, a cover plate, a sealing hole, a pressure leading hole, compression bolt holes, compression bolts, an auxiliary hole, and an auxiliary plate. When an external shock wave is applied to the effect target device, the wave is applied to five working areas of the response diaphragm through the pressure leading hole of the cover plate to cause plastic deformation and recession into the sealing hole below; a maximum deflection value is measured; and according to a dose-effect relationship between diaphragm deformation and an impact shock effect, an impact wave pressure peak value is obtained. According to the invention, the effect target device has the following advantages: the effect target device with the light weight is easy to arrange; the sealing performanceis good; the interference of the shock wave diffraction is eliminated; the effective range is wide; the pressure range capable of damaging the target is covered basically; a measurement problem of a large shock wave pressure changing range of the target of the moving explosive field is solved; the precision and reliability of the target pressure measurement in the moving explosive field are improved; and the need of the shock wave pressure measurement of the target of the moving explosive field is met.

The invention belongs to testing devices and discloses a pressure testing device. The pressure testing device comprises a pressure induction piece, an inductor outer shell support, an induction spring, an inductor outer shell, a piezoelectric type pressure sensor, a charge amplifier, an electric potential display instrument, a pressure display instrument and wires, and the inductor outer shell is made of explosion-proof material. By the adoption of the design that the inductor outer shell is made of the explosion-proof material, the pressure testing device can perform precise tests on kinds of pressure including overpressure and impact wave pressure, and precision of the pressure tests is ensured through reasonable combination of the piezoelectric type pressure sensor, the charge amplifier, the electric potential display instrument, the pressure display instrument and other instruments.

The invention discloses an effect target structure for measuring a peak value of an impact wave pressure of a movable target and a testing method, and belongs to the field of impact wave pressure testing. Specifically, the structure can be used for measuring the impact wave pressure of a blast field of the movable target. The structure mainly comprises a pressure response membrane installation substrate (1), a central body (2), a pressure response membrane (3), a cover plate (4), a pressure response membrane sealing groove (5), a pressure response membrane pressure leading hole (6), a bolt installation hole (7), a compression bolt (8), and a fastening connection hole (9). The invention also discloses a method for measuring the impact wave pressure and mean load of the movable target. According to the invention, the effect target structure is installed on the movable target for measuring the impact wave pressure in a target region, and obtains the impact pressure and mean load of six points in a 500mm*126mm region according to a deformation value of the pressure response membrane (3).