Raster harmonic oscillator earthquake wave detecting device
A technology of seismic waves and harmonic oscillators, applied in the field of exploration geophysics, can solve problems such as poor output signal quality of seismic detectors, and achieve the effects of improved accuracy, convenient adjustment, and stable performance
Inactive Publication Date: 2007-07-25
TIANJIN UNIV OF SCI & TECH
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[0004] The device for detecting seismic waves by grating harmonic oscillators in the present invention solves the problem of poor output signal quality of earthquake detectors by adopting split-phase indicating gratings, setting damping regulators and setting grating regulators
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[0019] The amplitude-split-phase grating pair of the present invention is composed of 4 groups of indicating gratings 5 and The main grating 2 is stacked together. The indicating grating 5 adopts the split-phase type, which is composed of 4 phases parallel to each other but the grating lines are staggered by a quarter of the pitch. After completing one area, the scale machine is moved by an additional 1 / 4 pitch, so as to ensure a phase difference of π / 2 between each area. Adjust the reticle of the indicator grating 5 to be parallel to the image of the reticle of the scale grating, then the four reticle areas and the main grating 2 move relative to each other to form shutter Moiré fringes. And received by 4 groups of photocells respectively, get 4 electrical signals with phase difference of 90°. The grating resonator is a spring-mass system composed of an aluminum support frame (including damping cylinder) and the main grating, and is placed between the collimated light sou...
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This is one kind of device to detect the seismic wave by raster resonance. It comprises the light source installed in the housing, the focus lens, the photoelectric transforming and magnifying device, the subsidiary raster, the raster resonance and the raster adjuster. The mentioned raster resonance are installed between the collimated light source and the photo cells. Its character is that superpose umpty groups of indicating raster and the main-raster to form the swing splitting subsidiary raster, and respectively receive the light brake Mole stripe signals severally formed by the relative movement of the above-mentioned umpty score sections and main raster by the umpty groups of electric eyes. On the raster rack of the mentioned raster resonance equipped two-piece damping adjuster. The mentioned raster adjuster includes two sets of adjusting devices to respectively adjust the angle between the raster lines of the two raster and the space between and the parallel pitch of the two raster. This invention makes use of the structure of splitting indicating raster group to reduce the error in judging directions, equips a damping adjuster to make the damping coefficient of the output signals have a adjusting bound between 0 and 0.9, and also equips a raster adjuster to adjust the distance and angle between indicating raster, which has improved the veracity of the recorded numbers and has made the cymoscope parameter more reasonable.
Description
technical field [0001] The invention relates to exploration geophysics technology, in particular to a vibration signal sensor suitable for matching with seismic exploration instruments. Background technique [0002] For traditional vibration signal sensors used in conjunction with seismic exploration instruments, refer to the grating geophones authorized and announced by the State Intellectual Property Office on December 18, 2002, and its patent number is 01269996.9. In this device, the main grating is fixed on an elastic device that can only move longitudinally, and constitutes a grating pair together with the index grating. The grating resonator is formed by the elastic device and the grating pair, and the grating resonator is placed between the collimated light source and the photoelectric conversion device, and is packaged together in a sealed casing. [0003] Although the above-mentioned device has solved the problem of converting the wave signal of the earthquake into...
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IPC IPC(8): G01V1/18
Inventor 李淑清陶知非南忠良李建良付连昆
Owner TIANJIN UNIV OF SCI & TECH