Force transducer, particularly for ballistic pressure measuring
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01L-005/14
출원번호
US-0270842
(1981-06-05)
우선권정보
DE-0021778 (1980-06-10)
발명자
/ 주소
Engeler, Paul
Sonderegger, Hans C.
Wolfer, Peter
출원인 / 주소
Kistler Instrumente AG
대리인 / 주소
Oblon, Fisher, Spivak, McClelland & Maier
인용정보
피인용 횟수 :
13인용 특허 :
1
초록▼
A force transducer, particularly for the ballistic measuring of the combustion pressure in the cartridge case of a firearm, is disclosed which includes a force transmission element which rests with one of its front areas on the cartridge case. The force transmission element is surrounded on its exte
A force transducer, particularly for the ballistic measuring of the combustion pressure in the cartridge case of a firearm, is disclosed which includes a force transmission element which rests with one of its front areas on the cartridge case. The force transmission element is surrounded on its exterior by an outer sleeve which also rests with its front area on the cartridge case. The front areas of the force transmission element and of the outer sleeve are exactly adapted to the curvature of the cartridge case by reaming after the transducer has been mounted in the firearm. With the combustion of the powder, the cartridge case expands and transmits its force to a sensor element via the force transmission element, with the sensor element being preferably in the form of at least one piezoelectric transversal quartz element which is held under pretension between the force transmission element and a basic receiver component. The spring rigidity of the force transmission element and the spring rigidity of the outer sleeve are matched in such a way that both parts yield essentially to the same extent to the pressures acting upon them in the axial direction of the transducer. The result is that the contact conditions of the cartridge case with the front area of the force transmission piston do not change appreciably after the expansion in comparison with the initial conditions so that a calibration curve of the force transducer which is independent of the installation can be supplied by the manufacturer.
대표청구항▼
1. A force transducer for use in ballistic pressure measurement, which comprises: a force transmission element including a first surface exposed to a pressure to be measured; sensor element means for producing an electrical signal representing said pressure to be measured, said elements being he
1. A force transducer for use in ballistic pressure measurement, which comprises: a force transmission element including a first surface exposed to a pressure to be measured; sensor element means for producing an electrical signal representing said pressure to be measured, said elements being held under pretension between a second surface of said force transmission element and a basic receiver component; and an outer sleeve surrounding the exterior of said force transmission element, said outer sleeve being coupled to said basic receiver component, said outer sleeve including a front surface exposed to said pressure to be measured; wherein the spring rigidity of said outer sleeve is coordinated with the spring rigidity of said force transmission element such that said outer sleeve yields to approximately the same extent as said force transmission element to the effective force of said pressure to be measured in an axial direction of said transducer. 2. The force transducer as recited in claim 1, wherein: the ratio of the spring rigidity of said force transmission element divided by the area of said first surface of said force transmission element exposed to said pressure to be measured to the spring rigidity of said outer sleeve divided by the area of the front surface of said outer sleeve exposed to the pressure to be measured lies in the range of 0.95 to 1.15. 3. The force transducer as recited in claim 1 or claim 2, wherein: the force response sensitivity E 1 of said force transmission element to the force response sensitivity E 2 of said force transmission element and said outer sleeve follows the relation: ##EQU## where: f is a correction factor coordinating the spring rigidity of said outer sleeve with the spring rigidity of said force transmission element and lying in the range of 1.0 to 1.05; F 1 is the area of said first surface of said force transmission element exposed to said pressure to be measured; and F 2 is the area of said front surface of said outer sleeve exposed to said pressure to be measured. 4. The force transducer as recited in claim 3, wherein: said first surface of said force transmission element exposed to said pressure to be measured and said first surface of said outer sleeve exposed to said pressure to be measured have a size ratio of approximately 1.3. 5. The force transducer as recited in claim 1, wherein said force transmission element comprises: a force transmission piston extending in said axial direction of said transducer, said piston including a first surface exposed to said pressure to be measured and a second surface upon which said sensor element means rests, said first and second surfaces of said piston being in an opposed relationship to each other, said first surface of said piston having a smaller area than that of said second surface of said piston. 6. The force transducer as recited in claim 1, which further comprises: a narrow annular gap located between said outer sleeve and said force transmission element, said gap being coupled with the outside atmosphere. 7. A force transducer for use in ballistic pressure measurement, which comprises: a force transmission piston including a first surface exposed to a pressure to be measured, said piston including a second surface located in an opposed relationship to said first surface, said piston extending in an axial direction of said transducer an adapter sleeve at least partially surrounding said piston and coupled thereto, said adapter sleeve coupling said piston to a basic receiver component; at least one piezoelectric transversal quartz element held under pretension between said second surface of said piston and said basic receiver element, said at least one element producing electrical signals representing said pressure to be measured; and an outer sleeve surrounding the exterior of said piston, said outer sleeve being coupled to said basic receiver component, said outer sleeve including a front surface exposed to said pressure to be measured, a narrow annular gap being provided between said outer sleeve and said piston, said gap being coupled with the outside atmosphere; wherein the spring rigidity of said outer sleeve is coordinated with the spring rigidity of said piston such that said outer sleeve yields to approximately the same extent as said piston to the effective force of said pressure to be measured in said axial direction. 8. A method for producing a force transducer including a force transmission element having a first surface exposed to a pressure to be measured and a second surface opposed to said first surface, and including a sensor element held under pretension between said second surface of said force transmission element and a basic receiver element, said method comprising the steps of: determining the power response sensitivity E 1 of said force transmission element by its own; arranging an outer sleeve about the exterior of said force transmission element, said outer sleeve being coupled to said basic receiver element, said outer sleeve having a front surface aligned with said first surface of said force transmission element and exposed to said pressure to be measured, said outer sleeve having a nominal wall thickness; determining the force response sensitivity E 2 of the combination of said force transmission element and said outer sleeve; and reducing the wall thickness of said outer sleeve to satisfy the equation: ##EQU## where: F 1 is the area of said first surface of said force transmission element exposed to said pressure to be measured; F 2 is the area of said front surface of said outer sleeve exposed to said pressure to be measured; and f is a correction factor. 9. The method of producing a force transducer as recited in claim 8, wherein the correction factor f lies in the range of 1.0 to 1.05. 10. The method of producing a force transducer as recited in claim 8, which further comprises the steps of: mounting said force transducer on a pressure carrying part; and adapting the shapes of the first surface of said force transmission element and the first surface of said outer sleeve to conform to the configuration of said pressure carrying part. 11. The method of producing a force transducer recited in claim 8, which further comprises the steps of: introducing said force transducer into the cartridge chamber of a firearm; and adapting said force transducer to the configuration of the bore hole of said cartridge chamber by reaming the first surface of said force transmission element and the front surface of said outer sleeve such that said first surface and said front surface rest in a flush manner on the outer surface of a cartridge case introduced into said cartridge chamber bore hole.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (1)
Change Nicholas D. (West Seneca NY) Riggs Michael T. (Batavia NY), Conformal pressure transducer.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.