摘要:
A position measurement system transmits moving interference pattern and these are received by a sensor fixed relative to the transmitter and a mobile sensor, by comparring the phases of the interference pattern at the two sensors the position of the mobile sensor relative to the transmitter can be calculated.
摘要:
A sensor comprises a beam 1, e.g. of silicon, which resonates at a frequency dependent on the force imposed on the beam. Light on line 11 induces resonance of the beam 1 by means of the photothermal effect. The light reflected from the beam 1 is amplitude modulated at the resonance frequency, and returns along line 11. It is reflected by semi-reflecting plane mirror 17 onto lens 19 which focusses it onto photodetector 20. Photodetector 20 produces an output voltage modulated at the oscillation frequency, and is thus representative of the force imposed on beam 1.
摘要:
@ Vibrating beam force sensors have a relatively low Q unless there can be prevented energy loss to the mountings at either end of the beam. This can be achieved by providing some sort of counterbalanced vibrating element; the available beam structures, which are all quite complex, involve balancing beams or counterweights that are in the vibrational plane of the 'main' beam, and flex in that plane. The invention provides a mechanically simpler but no less efficient beam structure by placing counterbalancing beams not above and below the main beam but on either side thereof.
摘要:
A fluxgate magnetometer is formed by a body of magnetic material driven into saturation by current around one coil and read by a second coil, the coils being formed by thin layers of conductive material formed on insulating substrates.
摘要:
@ Vibrating beam force sensors have a relatively low Q unless there can be prevented energy loss to the mountings at either end of the beam. This can be achieved by providing some sort of counterbalanced vibrating element; the available beam structures, which are all quite complex, involve balancing beams or counterweights that are in the vibrational plane of the 'main' beam, and flex in that plane. The invention provides a mechanically simpler but no less efficient beam structure by placing counterbalancing beams not above and below the main beam but on either side thereof.
摘要:
A position measurement system transmits moving interference pattern and these are received by a sensor fixed relative to the transmitter and a mobile sensor, by comparring the phases of the interference pattern at the two sensors the position of the mobile sensor relative to the transmitter can be calculated.
摘要:
A sensor comprises a beam 1, e.g. of silicon, which resonates at a frequency dependent on the force imposed on the beam. Light on line 11 induces resonance of the beam 1 by means of the photothermal effect. The light reflected from the beam 1 is amplitude modulated at the resonance frequency, and returns along line 11. It is reflected by semi-reflecting plane mirror 17 onto lens 19 which focusses it onto photodetector 20. Photodetector 20 produces an output voltage modulated at the oscillation frequency, and is thus representative of the force imposed on beam 1.
摘要:
A fluxgate magnetometer is formed by a body of magnetic material driven into saturation by current around one coil and read by a second coil, the coils being formed by thin layers of conductive material formed on insulating substrates.