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An air sampler having a fan; an air inlet tube; a main body having a cyclonic cup, a stripping column and a demister; and fluidic circuitry for inputting fluids to the main body and the air inlet tube, and for outputting fluids from the main body. Air flow through the air sampler may be generated by

An air sampler having a fan; an air inlet tube; a main body having a cyclonic cup, a stripping column and a demister; and fluidic circuitry for inputting fluids to the main body and the air inlet tube, and for outputting fluids from the main body. Air flow through the air sampler may be generated by a fan that is either external or internal with respect to the main body's cyclonic cup. A thin film of stripping liquid and/or a fog of stripping liquid particles in the air inlet tube, the cyclonic cup, the stripping column and/or the demister strip a target material from the air flow through the air sampler. A passive fog generating slot or a passive spiral fog generating nozzle may be placed over the fluid input conduit in the center of the cyclonic cup. The air sampler's main body and/or an air inlet tube may be integrally formed as one part. The main body's inner surfaces may be selected to be hydrophilic, for better flow of the thin film of stripping liquid across them; and its intersecting internal surfaces may be provided with smoothly curved fillets for better air and liquid flow over them. The air sampler may be provided with a liquid level control that may have a reservoir float monitored by external optical sensors; a flexible, capacitive effect, dual electrode bearing substrate that is wrapped around the exterior of the air sampler's stripping column; or an external optical bubble sensor for the reservoir's output conduit. The air sampler may be so small, light and low in energy consumption that it may be battery powered and human-portable; and may be so efficient that it may be used to strip target material that is present in the incoming air in concentrations of only a few parts per trillion, or less.

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An air sampler having a fan; an air inlet tube; a main body having a cyclonic cup, a stripping column and a demister; and fluidic circuitry for inputting fluids to the main body and the air inlet tube, and for outputting fluids from the main body. Air flow through the air sampler may be generated by

An air sampler having a fan; an air inlet tube; a main body having a cyclonic cup, a stripping column and a demister; and fluidic circuitry for inputting fluids to the main body and the air inlet tube, and for outputting fluids from the main body. Air flow through the air sampler may be generated by a fan that is either external or internal with respect to the main body's cyclonic cup. A thin film of stripping liquid and/or a fog of stripping liquid particles in the air inlet tube, the cyclonic cup, the stripping column and/or the demister strip a target material from the air flow through the air sampler. A passive fog generating slot or a passive spiral fog generating nozzle may be placed over the fluid input conduit in the center of the cyclonic cup. The air sampler's main body and/or an air inlet tube may be integrally formed as one part. The main body's inner surfaces may be selected to be hydrophilic, for better flow of the thin film of stripping liquid across them; and its intersecting internal surfaces may be provided with smoothly curved fillets for better air and liquid flow over them. The air sampler may be provided with a liquid level control that may have a reservoir float monitored by external optical sensors; a flexible, capacitive effect, dual electrode bearing substrate that is wrapped around the exterior of the air sampler's stripping column; or an external optical bubble sensor for the reservoir's output conduit. The air sampler may be so small, light and low in energy consumption that it may be battery powered and human-portable; and may be so efficient that it may be used to strip target material that is present in the incoming air in concentrations of only a few parts per trillion, or less. plurality of portions arranged in a circumferential direction of said first rotor with predetermined spaces between, said stationary core is so arranged that said core body holding said two exciting coils is symmetrical with respect to a plane normal to said rotation axis, and said second conductive layer of said second rotor is provided on an outer circumferential surface of said second rotor and consists of a plurality of portions arranged in a circumferential direction of said second rotor with spaces between, said spaces between the portions of said second conductive layer corresponding to the spaces between the portions of said first conductive layer. 2. The rotation sensor according to claim 1, wherein said stationary core comprises a shielding case capable of blocking an ac magnetic field, and said core body is held in said shielding case. 3. The rotation sensor according to claim 2, wherein said shielding case is formed of aluminum, silver or iron. 4. The rotation sensor according to claim 1, wherein said insulating ferromagnetic layer is made of insulating ferromagnetic material that is a mixture of electrical-insulating thermoplastic synthetic resin and 10 to 70 volume % of powder of soft magnetic material. 5. The rotation sensor according to claim 4, wherein said thermoplastic synthetic resin is any of nylon, polypropylene, polyphenylsulfide and ABS resin. 6. The rotation sensor according to claim 4, wherein said soft magnetic material is Ni--Zn ferrite or Mn--Zn ferrite. 7. The rotation sensor according to claim 1, wherein said first and second conductive layers are formed of copper, aluminum or silver. 8. The sensor of claim 1, wherein the first conductive layer is about 0.1 to 0.5 nm. 9. The sensor of claim 1, wherein the first rotor has an outter circumference that is substantially equidistant to an axis of rotation of the first rotor. 10. A rotation sensor for detecting a rotation angle of a rotating shaft, comprising: a rotor having an insulating ferromagnetic layer and a first conductive layer provided to cover said insulating ferromagnetic layer in a range corresponding to a center angle of 180°, said rotor being fixed to said rotating shaft, a stationary core having two exciting coils arranged in an axial direction of a rotation axis of said rotor with a predetermined space between, a core body for holding said exciting coils, and a second conductive layer provided on at least one of the opposite sides of said stationary core as viewed in the axial direction of said rotation axis to cover at least one of said exciting coils and a corresponding portion of said core body in a range corresponding to a center angle of 180°, said stationary core being fixed to a stationary member in a manner that said core body holding said exciting cores is symmetrical with respect to a plane normal to said rotation axis, oscillation means for producing an oscillating signal of a particular frequency, said oscillation means being electrically connected to each of said exciting coils, variation detecting means for detecting a variation in impedance of each of said two exciting coils due to eddy currents induced in said rotor, difference detecting means for detecting a difference in the detected amount of variation in impedance between said two exciting coils, and determining means for determining a rotation angle based on the detected difference. 11. The rotation sensor according to claim 10, wherein said stationary core comprises a shielding case for holding said core body. 12. The rotation sensor according to claim 11, wherein said shielding case is formed of aluminum, silver or iron. 13. The rotation sensor according to claim 10, wherein said insulating ferromagnetic layer is made of insulating ferromagnetic material that is a mixture of electrical-insulating thermoplastic synthetic resin and 10 to 70 volume % of powder of soft magnetic material. 14. The rotation sensor according to claim 13, wherein said the rmoplastic synthetic resin is any of nylon, polypropylene, polyphenylsulfide and ABS resin. 15. The rotation sensor according to claim 13, wherein said soft magnetic material is Ni--Zn ferrite or Mn--Zn ferrite. 16. The rotation sensor according to claim 10, wherein said first conductive layer is formed of copper, aluminum or silver. 17. The sensor of claim 10, wherein the first conductive layer is about 0.1 to 0.5 nm. 18. The sensor of claim 10, wherein the rotor has an outter circumference that is substantially equidistant to an axis of rotation of the rotor. 19. A rotation sensor for detecting a relative rotation angle between first and second relatively rotating shafts, comprising: a first rotor having an insulating ferromagnetic layer and a first conductive layer provided to cover said insulating ferromagnetic layer in a range corresponding to a center angle of 180°, said rotor being fixed to said first rotating shaft; said first rotor being fixed to one of said first and second shafts at a predetermined position in an axial direction of said one of the first and second shafts; a stationary core having two exciting coils arranged in an axial direction of a rotation axis of said rotor with a predetermined space between, and a core body for holding said exciting coils, a second conductive layer provided on at least one of the opposite sides of said stationary core as viewed in the axial direction of said rotation axis to cover at least one of said exciting coils and a corresponding portion of said core body in a range corresponding to a center angle of 180°, said stationary core being fixed to a stationary member, in a manner that said core body holding said exciting cores is symmetrical with respect to a plane normal to said rotation axis; a second rotor having a second conductive layer, said second rotor being fixed to the other of said first and second shafts and arranged between said first rotor and said stationary core; oscillation means for producing an oscillating signal of a particular frequency, said oscillation means being electrically connected to each of said exciting coils; variation detecting means for detecting a variation in impedance of each of said two exciting coils due to eddy currents induced in said first and second rotors; difference detecting means for detecting a difference in the detected amount of variation in impedance between said two exciting coils; determining means for determining a relative rotation angle based on the detected difference, wherein said first conductive layer of said first rotor is provided on said insulating ferromagnetic layer, on at least one of the opposite sides of said first rotor as viewed in the axial direction of said rotation axis, and consists of a plurality of portions arranged in a circumferential direction of said first rotor with predetermined spaces between, wherein said stationary core is so arranged that said core body holding said two exciting coils is symmetrical with respect to a plane normal to said rotation axis, and wherein said second conductive layer of said second rotor is provided on an outer circumferential surface of said second rotor and consists of a plurality of portions arranged in a circumferential direction of said second rotor with spaces between, said spaces between the portions of said second conductive layer corresponding to the spaces between the portions of said first conductive layer. 20. The rotation sensor of claim 19, wherein said stationary core comprises a shielding case capable of blocking an ac magnetic field, and said core body is held in said shielding case. are changed by the torque-dependent transducer characteristics. The electrical signals are coupled to the outside (non-rotating) world by at least one capacitive coupler. In one embodiment, an fixed-frequency oscillator produces signal, and the transmission of the signal is affected by the torque-dependent resonant frequency of the transducer. In another embodiment, the transducer is coupled in the feedback loop of a circuit to form an oscillator, in which the frequency is responsive to the torque. A transducer may be placed and distributed in a protective holder. The holder may be pierced in particular locations in order to increase or decrease its sensitivity. One transducer is in the form of a monolithic mounting/transducer.