fiber-laser-based ultrasound sensor for photoacoustic imaging
Especially for intra-vascular and endoscopic applications, sound and light imaging requires an ultrasound probe with a small size and high sensitivity.
In this paper, we propose a new approach based on small-
Fiber Laser.
The incident ultrasound applies pressure to the fiber laser and causes harmonic vibration of the fiber, which is detected by the frequency offset of the beating signal between two orthogonal polarization modes in the fiber laser.
This ultrasonic sensor makes noise.
Equivalent pressure at 50-40 paMHz bandwidth.
We have demonstrated this new ultrasonic sensor in optics.
Distinguish sound and light microscope
The axial and lateral resolutions are 48 μm and 3, respectively. 3u2009μm.
It appears to be in the economic and social field. 57u2009mm2.
The sensor has strong resistance to environmental interference, such as temperature changes, because --
The pattern is canceled between two orthogonal patterns.
The current optical fiber laser ultrasonic sensor is all-
Optical sound and light imaging
The fiber laser is manufactured by stamping two fiber Prague grating with wavelength matching (FBGs)
In the Er series
Yb co-doping fiber (EY-305, Fibercore).
Fiber grating refers to the Interior
The core cycle exponential modulation, formed by the diffraction of the phase shield, is illuminated by the use of a laser of 193 kbps nm excitation element.
Each grating acts as a distributed reflector with coupling strength k greater than 10 cm at the Prague wavelength, providing strong optical feedback for laser oscillation.
The grating period is 1053 nm and the corresponding reflection wavelength is . . . . . . = u2009 Λ u2009 1532 u2009 nm is refers to the effective refractive index of fiber.
This wavelength is the rare earth located in the absorption peaks of various places.
Ground-mixed optical fiber with maximum lumen gain.
The grating length is 6 and 5mm respectively.
The spacing of the grating is less than 0. 5u2009mm.
The output power of this laser is usually 500mw μ w, and the pump power at nm is 100 mw.
Hydraulic universal testing machines have very high accuracy requirements.
The hydraulic system is the power drive mechanism of the tensile testing machine.
The specific application of the electronic universal testing machine in the automobile manufacturing process: The electronic universal testing machine needs to be used for automobile parts.
Wave soldering refers to the molten solder (lead-tin alloy), sprayed by electric pump or electromagnetic pump into the solder wave required by the design, can also be formed by injecting nitrogen into the solder pool, so that it is pre-loaded The printed board of the component realizes the soft soldering of the mechanical and electrical connection between the solder end or the pin of the component and the pad of the printed board through the solder wave.
The frequency converter is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's working power supply.
Electronic universal testing machine is a necessary equipment to control the quality of products.
The calibration operation of the electronic universal testing machine is still relatively unfamiliar to friends who use it for the first time.
Selective wave soldering defects and their prevention.
Testing machine, broadly speaking, is an instrument that verifies the quality or performance of a product or material according to the design requirements before it is put into use.
The tensile force is not an accurate value after being measured by the testing machine, and subsequent calculations are required to get the desired value.
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