CS-L Cesium Vapor Magnetometer Sensor OPERATION ... - Scintrex

Getting Started
Your CS-L”, it is important to know the direction of the optical axis which is going
through the centre of the sensor head.
The sensor head housing provides an air/water tight enclosure for the sensor
components, and it should not be opened. In addition, critical optical components
inside the sensor head are carefully aligned in order to minimize the orientation
errors, and opening the sensor head by unqualified people may upset the alignment.
Sensor Electronics
The sensor electronics are housed in a cylindrical container as shown in the following
schematic.
2—3
Figure 2 - Schematic of the electronics housing
The electronics consist of three major subsystems:
• Larmor amplifier
• Lamp and absorption cell heaters
• RF lamp exciter
The RF exciter generates few watts of RF power at the frequency of about 165MHz.
In order to keep the radiated electromagnetic interference low, the exciter is located
inside a metallic enclosure. In addition, all the sensor electronic systems are
enclosed inside a metal box.
Electronic Housing
Internally, the sensor electronic housing is connected to the negative line of the input
supply voltage. If the negative side of the power supply, which provides the power for
the CS-L, is grounded to the frame of the vehicle, and if the electronic box of the CS-
L makes an electrical contact to the same frame, then the return current could flow
partially through the frame instead of being confined to the return line inside the
supply cable.
The stray magnetic field created by this current could corrupt the measurement of the
ambient field.
P/N 763701 Rev. 1