GB1170067A - Accelerometer - Google Patents
AccelerometerInfo
- Publication number
- GB1170067A GB1170067A GB4762466A GB4762466A GB1170067A GB 1170067 A GB1170067 A GB 1170067A GB 4762466 A GB4762466 A GB 4762466A GB 4762466 A GB4762466 A GB 4762466A GB 1170067 A GB1170067 A GB 1170067A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sensor
- active medium
- mirrors
- beams
- resonator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2383—Parallel arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/18—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
1,170,067. Lasers. NORTH AMERICAN AVIATION Inc. 24 Oct., 1966, No. 47624/66. Heading H1C. An accelerator comprises a gas laser structure having an acceleration sensor located between or forming part of the resonator mirrors, the sensor in operation causing an effective change in the optical length of the resonator and thereby changing the output frequency. A threeaxis accelerometer is shown in Fig. 2 in which four gas active media 15 are located between a fully reflecting mirror 14 and a partially transmitting mirror 13, three of the media having each a respective acoelerometer stress sensor 11, 10, 16 one for each axis in its emission path, and the remaining active medium being associated with a reference sensor 12 unaffected by acceleration. Internal mirrors 21 are necessarily associated with sensor 16 and its associated active medium. Externally to the laser fully reflecting mirrors 17 and partially reflecting mirrors 18 direct each sensor-influenced output to a respective axis detector 19, 20, 22 together with a reference output from the fourth active medium, acceleration being detected in both magnitude and direction as a frequency difference. Helium-neon gas is used as the active medium. The accelerometer may be made as a composite block formed by fitting together two identical quartz housings 30, Fig. 3a (not shown) and Fig. 3b, the resonator mirorrs 13, 14 and internal mirrors 21 being applied to the housings at 31, 37 and M1-M4, and the cavities 32 and 34, 35, 36 being filled with gaseous active medium and acceleration sensors respectively. Gas discharge in the active medium cavities may be established by passing D.C. through the gas using electrodes inserted in the block, or by inductively coupling A.C. or R.F. through electrodes outside the block. A basic accelerometer is shown in Fig. 4 in which a polarization isolator 43 resolves the beam emitted by active medium 42 into two beams of different polarization, the beams passing respectively through a stress sensor material 44 and an unstressed reference material 45. Outside the resonator defined by mirrors 41, 46, the two beams are combined in a polarization combiner 47 and the difference frequency between the two beams detected by a heterodyning apparatus 48. A similar arrangement, Fig. 5, separates the generated beam into ordinary and extraordinary rays O, E by using a double refracting material 50, the beams being recombined by externally-located double refracting material 51 after passing through the stress and reference sensors 55, 56 respectively. After passing through an analyser 52, the frequency difference in the output is detected by heterodying. In a modification. Fig. 6 (not shown), the double refracting material internal of the resonator is stress sensitive and is mass-loaded so as to act as a sensor determining the frequency of the ordinary and extraordinary rays passed. A further arrangement, Fig. 7, uses two active media 15 to produce a signal beam and a reference beam. Each active medium has its own resonator formed by mirrors 14, 70 and 14, 71, the reflecting surface of mirror 71 being deformable under acceleration. A push-pull form of output is obtained in Fig. 8 (not shown) in which two beams from separate active media pass through opposite ends of a common acceleration stress sensor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4762466A GB1170067A (en) | 1966-10-24 | 1966-10-24 | Accelerometer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4762466A GB1170067A (en) | 1966-10-24 | 1966-10-24 | Accelerometer |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1170067A true GB1170067A (en) | 1969-11-12 |
Family
ID=10445667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4762466A Expired GB1170067A (en) | 1966-10-24 | 1966-10-24 | Accelerometer |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1170067A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0228773A1 (en) * | 1985-10-10 | 1987-07-15 | British Aerospace Public Limited Company | Movement sensing |
EP2884287A1 (en) * | 2013-12-11 | 2015-06-17 | Northrop Grumman Systems Corporation | Optical accelerometer systems and method |
CN104849496A (en) * | 2015-04-27 | 2015-08-19 | 哈尔滨工业大学深圳研究生院 | High impact acceleration detecting method and sensor based on corona discharge principle |
US11079230B2 (en) | 2019-05-10 | 2021-08-03 | Northrop Grumman Systems Corporation | Fiber-optic gyroscope (FOG) assembly |
-
1966
- 1966-10-24 GB GB4762466A patent/GB1170067A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0228773A1 (en) * | 1985-10-10 | 1987-07-15 | British Aerospace Public Limited Company | Movement sensing |
EP2884287A1 (en) * | 2013-12-11 | 2015-06-17 | Northrop Grumman Systems Corporation | Optical accelerometer systems and method |
US9417260B2 (en) | 2013-12-11 | 2016-08-16 | Northrop Grumman Systems Corporation | Optical accelerometer systems and method |
CN104849496A (en) * | 2015-04-27 | 2015-08-19 | 哈尔滨工业大学深圳研究生院 | High impact acceleration detecting method and sensor based on corona discharge principle |
CN104849496B (en) * | 2015-04-27 | 2018-04-24 | 哈尔滨工业大学深圳研究生院 | A kind of high-impact acceleration detection method and sensor based on principle of corona discharge |
US11079230B2 (en) | 2019-05-10 | 2021-08-03 | Northrop Grumman Systems Corporation | Fiber-optic gyroscope (FOG) assembly |
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