Cs-3 Manual - Scintrex

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Orienting Your CS-3Figure 7b - Plot of tumble heading error curve (southern hemisphere).Plot shows magnetic field (readout difference between a specificsensor under test and an immobile reference) against tumble angle.3-6CS-3 Manual - part # 762701 Revision 1.0
Using a Strapped Down CS-3 for SurveysWherever a magnetic survey is conducted, the CS-3 Cesium Magnetometercan be strapped rigidly to a survey vehicle, such as an airplane, a ship or anautomobile. It is convenient to use a simple, nonmagnetic gimbal platformmade by Scintrex, as this allows the magnetometer sensor to be precisely andquickly oriented in azimuth and inclination.The vehicle conducts a magnetic survey by moving on the well definedsurvey grid consisting of parallel survey lines. If the survey lines are orientedin the NW direction, for example, the survey vehicle may travel either in theNW or SE directions shown in Figure 8 on page 3-9.Several times during a survey day, a tie line may be used as shown in Figure8. The tie line is generally flown at 90° to the survey line, which would be inour example either in the NE or SW direction. The magnetometer sensororientation must be selected so that it performs well on the direction parallelor antiparallel to the survey line, and parallel or antiparallel to the tie line,which is perpendicular to the survey line.Calculating the Tumble AngleCS-3 sensor orientation is determined by two angles:• the sensor azimuth, α, defined as the angle in the horizontal plane betweenthe horizontal projection of the sensor optical axis direction and the directionof the magnetic north• the magnetometer sensor inclination, β, defined as the angle in the verticalplane between the horizontal line and the magnetometer optical axis.• The ambient magnetic field inclination, γ, is defined as the angle between thehorizontal and the field direction. The Earth's magnetic field inclination is apositive angle in the range from 0° to 90° in the Earth's Northern MagneticHemisphere and negative in the Southern Hemisphere. Its dependence on thegeographic location is shown in Figure 6 on page 3-3.For a given sensor orientation and magnetic field inclination, the anglebetween the sensor and the magnetic field, i.e. the tumble angle, θ, can becalculated from the following equation:θ = arccos(cosα x cosβ x cosγ + sinβ x sinγ ) (3)Orientation3-7CS-3 Manual - part #762701 Revision 1.0
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Page 5 and 6: Table of ContentsTable of Contents
Page 7 and 8: ForewordForewordThe CS-3 is an opti
Page 9 and 10: High Gradient ToleranceAbsorption c
Page 11 and 12: • the interfering EM field are no
Page 13 and 14: 1 GettingStartedStartupAbout this m
Page 15 and 16: About this manualChapter LayoutThis
Page 17 and 18: Understanding Instrument BasicsUnde
Page 19 and 20: Understanding Instrument BasicsSens
Page 21 and 22: Understanding Instrument BasicsIt p
Page 23 and 24: 2 Operating theCS-3 in theFieldBy n
Page 25 and 26: Setting Up the CS-3Mounting the CS-
Page 27 and 28: Obtaining the Larmor SignalObtainin
Page 29 and 30: Setting the Operating HemisphereSet
Page 31 and 32: Setting the Operating HemisphereEle
Page 33 and 34: Operating in the Presence of Spurio
Page 35 and 36: 3 OrientingYour CS-3An ideal magnet
Page 37 and 38: in the southern polar orientation t
Page 39: OrientationFigure 7a - Plot of tumb
Page 43 and 44: Sensor Inclination 90°From the gra
Page 45 and 46: Figure 10 - Plot of tumble angle ve
Page 47 and 48: Figure 12 - Plot of tumble angle ve
Page 49 and 50: Sensor Inclination 22.5°The orient
Page 51 and 52: Sensor Inclination 0°The orientati
Page 53 and 54: In the overlap regions the tumble a
Page 55 and 56: Only two orientations are useful an
Page 57 and 58: 4Maintaining YourCS-3 andTrouble-sh
Page 59 and 60: Trouble-shootingThere are largespur
Page 61 and 62: Reference5 ReferenceInformationCS-3
Page 63 and 64: Instrument Parts ListInstrument Par
Page 65 and 66: Warranty and RepairConcord, Ontario
Page 67 and 68: ATheory ofOperationTheorySystem Ove
Page 69 and 70: Therefore, no pumping is taking pla
Page 71 and 72: BCS-3 BlockDiagramTheoryAs shown on
Page 73 and 74: IndexAAbsorption cellmagnetic field
Page 75: Head Office222 Snidercroft RoadConc

Cs-3 Manual - Scintrex

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