GB1062466A - Improvements in apparatus for measuring the time interval between the pulses of a recurring pair - Google Patents
Improvements in apparatus for measuring the time interval between the pulses of a recurring pairInfo
- Publication number
- GB1062466A GB1062466A GB27411/64A GB2741164A GB1062466A GB 1062466 A GB1062466 A GB 1062466A GB 27411/64 A GB27411/64 A GB 27411/64A GB 2741164 A GB2741164 A GB 2741164A GB 1062466 A GB1062466 A GB 1062466A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- echo
- pulses
- measuring
- gating
- 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
- 239000003129 oil well Substances 0.000 abstract 2
- 230000000306 recurrent effect Effects 0.000 abstract 2
- 238000013016 damping Methods 0.000 abstract 1
- 239000003822 epoxy resin Substances 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 239000008187 granular material Substances 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 229920000647 polyepoxide Polymers 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
- 230000001960 triggered effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/18—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein range gates are used
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/08—Measuring diameters or related dimensions at the borehole
- E21B47/085—Measuring diameters or related dimensions at the borehole using radiant means, e.g. acoustic, radioactive or electromagnetic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/66—Radar-tracking systems; Analogous systems
- G01S13/70—Radar-tracking systems; Analogous systems for range tracking only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
- G01S15/10—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves
- G01S15/18—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves wherein range gates are used
-
- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Radar, Positioning & Navigation (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- Electromagnetism (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
1,062,466. Time interval measurement. SOC. DE PROSPECTION ELECTRIQUE SCHLUMBERGER. July 2, 1964 [July 3, 1963], No. 27411/64. Heading H4D. The invention broadly relates to apparatus for measuring the time interval between the pulses of a recurrent pair when the second pulse of the recurrent pair may be randomly absent especially where the pulses are a transmitted radio or acoustic pulse and its associated echo pulse. The trailing edge of a measuring pulse commenced in synchronism with the transmitted pulse is caused to track the mid-point of the echo by sampling the echo pulse with early and late gates abutting either side of the trailing edge. A gating pulse wide enough to completely enclose the echo is also caused to centre itself around the trailing edge of the measuring pulse and acts to gate through to the early and late gate circuitry only the required echo pulse in the presence of unwanted signals. Loss of the echo pulse causes the capture width of the gating pulse to increase. In the described embodiment which is an ultrasonic oil well diameter measuring device an unwanted echo (S20b), Fig. 3 (not shown), is caused by reflection of the transmitted pulse (S20a) from a pressure shell surrounding the transducer 34, Fig. 2. The required echo (S20c) is produced by the wall of the oil well. The echo pulses are converted into pulses (S38) in shaper 38 and the required pulse (S38c) is gated through AND gate 56 by means of the gating pulse (S42). The measuring pulse (S44) is produced by a monostable multivibrator 44 triggered by a pulse (S30) which also triggers the transmitted pulse and has its duration controlled by a control voltage applied to the multivibrator at point 71. Pulse (S44) is fed from the 1 output of multivibrator 44 to one input of AND circuit 62, whilst the inverse of pulse (S44) is fed from output T of multivibrator 44 to one input of AND circuit 64. The other inputs of the AND circuits are fed with the pulse (S38c), such that the AND circuits produce outputs (S62) and (S64) representing the respective overlaps of the pulse (S38c) with the measuring pulse and its inverse. The pulses (S62) and (S64) then pass to a current generator 66 which delivers a positive current to a condenser 68 during pulse (S62) and a negative current during pulse (S64). The net charge on condenser 68 (E68), represents the difference in the widths of the pulses (S62) and (S64) and is used to control the width of the measuring pulse until the trailing edge of that pulse coincides with the pulse (S38c) as required. A pulse (S40) is produced by a monostable multivibrator 40 and like pulse (S44) is started by pulse (S30) and controlled in duration by a signal applied at point 55. The termination of pulse (S40) triggers a similar duration controlled multivibrator 42 to produce the gating pulse (S42). The gating pulse (S42) is fed to AND gates 46 and 48 together with the measuring pulse (S44) and its inverse respectively, to produce output pulses (S46) and (S48) respectively. These are fed to a current generator 50, similar to generator 66, such that condenser 52 and integrator 54 produces a control signal (E52) whereby the width of the pulse (S40) is adjusted until the gating pulse (S42) is aligned with the end of measuring pulse (S44). The gated echo pulses (S56) are integrated by means 58 to produce a signal proportional to the average repetition rate of the echo pulses which controls the width of the gating pulse. The arrangement is such that when the echo pulses are lost for a time and their average repetition rate thus falls, the control signal correspondingly falls causing the width of the gating pulse to increase such that there is greater chance of the echo being picked up again if it has moved when it reappears. The transducer may be formed with a rear wave damping system comprising granules of glass embedded in a block of epoxy resin.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR940183A FR1369495A (en) | 1963-07-03 | 1963-07-03 | Method for measuring the difference between the instants of appearance of two recurrent electrical pulses |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1062466A true GB1062466A (en) | 1967-03-22 |
Family
ID=8807459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27411/64A Expired GB1062466A (en) | 1963-07-03 | 1964-07-02 | Improvements in apparatus for measuring the time interval between the pulses of a recurring pair |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE1241629B (en) |
FR (1) | FR1369495A (en) |
GB (1) | GB1062466A (en) |
NL (2) | NL6407398A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110412545A (en) * | 2019-07-26 | 2019-11-05 | 桂林理工大学 | The analog-to-digital measuring circuit of pulse lidar time interval |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2940073A (en) * | 1956-05-17 | 1960-06-07 | Bendix Aviat Corp | Pulse echo tracking system |
-
0
- NL NL127046D patent/NL127046C/xx active
-
1963
- 1963-07-03 FR FR940183A patent/FR1369495A/en not_active Expired
-
1964
- 1964-06-24 DE DES91670A patent/DE1241629B/en active Granted
- 1964-06-29 NL NL6407398A patent/NL6407398A/xx unknown
- 1964-07-02 GB GB27411/64A patent/GB1062466A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110412545A (en) * | 2019-07-26 | 2019-11-05 | 桂林理工大学 | The analog-to-digital measuring circuit of pulse lidar time interval |
Also Published As
Publication number | Publication date |
---|---|
DE1241629C2 (en) | 1967-11-30 |
FR1369495A (en) | 1964-08-14 |
NL6407398A (en) | 1965-01-04 |
DE1241629B (en) | 1967-06-01 |
NL127046C (en) |
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