[Science] Detailed current sensor type (II)
Sensor is an essential product of the information age, almost everywhere. It is the key to human access to information from the outside world. Now people rely on their sense organs, in the study of natural phenomena and laws as well as production activities in their function is far enough.
[Then] current science Detailed species (a) of the sensor article writing.
1, a laser sensor measurements using laser technology. It consists of laser, a laser detector and the measuring circuit. Laser sensor is a new measuring instruments, it has the advantage to achieve non-contact distance measurement, speed, high precision, large span, resistance to light, strong electric interference capability. When the laser sensor working, first diode laser emitting laser pulses emitted at the target. Laser light scattering in all directions after the object reflector. Sensor portion of the scattered light returns to the receiver, the receiving optical system is imaged onto the avalanche photodiode. The avalanche photodiode is an optical sensor having an internal amplification function, so it can detect very weak light signals, and converts it into a corresponding electrical signal. High directivity using a laser, high brightness and high color characteristics allows contactless distance measurement.
2, the Hall sensor is a Hall sensor according to one Hall effect magnetic field produced, widely used in industrial automation technology, detection technology and information processing aspects. Hall effect is the basic method in semiconductor material properties. Experimentally determined by a Hall-effect Hall coefficient, important parameters can be determined conductivity type semiconductor material, the carrier concentration and the carrier mobility and the like.
3, the biosensor is the biological active transducer biological material (enzymes, proteins, DNA, antibodies, antigens, biofilms, etc.) with a physico-chemical transducer interdisciplinary organic binding, is essential for the development of an advanced biotechnology fast, microanalysis method of detection and monitoring methods, but also at the molecular level of matter. Various biosensors have the following common structure: comprises one or more of the bioactive material (biofilm) expression and biological activity can signal into an electrical signal a physical or chemical transducer (sensor), a combination of both together, reprocessing biosignal modern microelectronic technology and automation instruments constituting the biosensor analysis apparatus, the various instruments and systems may be used.
