59 results about "Third wave" patented technology

The invention provides a three-dimensional holographic imaging method. The method comprises the following steps: loading a holographic pattern to be imaged to a spatial light modulator; modulating a preset laser source by using a spatial light modulator loaded with a holographic pattern to form a first wavefront with initial phase information; carrying out primary scattering on the first wavefront by adopting a first turbid medium lens to form a second wavefront; compensating the second wavefront by adopting a metasurface compensation unit to form a third wavefront; after a second turbid medium lens is adopted to carry out secondary scattering on the third wavefront, a holographic imaging system is utilized to carry out imaging; wherein the metasurface compensation unit is determined according to a transmission matrix of the first turbid medium lens and a transmission matrix of the second turbid medium lens. The imaging view angle can be effectively increased, and the space bandwidth product can be improved.

The invention relates to the field of lighting devices, and particularly discloses a moonlight-simulating light-emitting device which comprises a green light unit and a fluorescent glue layer, and the green light unit is used for emitting green light; the fluorescent glue layer wraps the green light unit, so that green light emitted by the green light unit is converted into irradiation light simulating moonlight; the irradiation light comprises light of a first wave band, light of a second wave band and light of a third wave band; the wavelength range of the light of the first wave band is 350 nm to 480 nm, the wavelength range of the light of the second wave band is 481 nm to 780 nm, and the wavelength range of the light of the third wave band is 781 nm to 1000 nm; in the irradiation light, the proportion of the light of the first wave band is smaller than or equal to 2%, and the proportion of the light of the third wave band is larger than or equal to 10%. Irradiation light emitted by the light-emitting device can simulate a moonlight spectrum, and the effects of helping sleep, soothing the nerves and accelerating metabolism are achieved.

Provided in the present application are an optical device, an optical module and an optical communication system. The optical device provided in the present application comprises a tube body, and a first receiving encapsulation structure, a second receiving encapsulation structure and a first emitting encapsulation structure, which are installed on the tube body, wherein the first receiving encapsulation structure encapsulates a first light-receiving chip which is used for receiving light of a first wave band; the second receiving encapsulation structure encapsulates a second light-receiving chip which is used for receiving light of a second wave band, and a third light-receiving chip which is used for receiving light of a third wave band; and the first emitting encapsulation structure encapsulates a first light-emitting chip which is used for emitting light of a fourth wave band, and a second light-emitting chip which is used for emitting light of a fifth wave band. The optical device provided in the present application can integrates three receiving light paths together with three emitting light paths, and can realize the compatibility with regard to three generations of network services, so as to realize the smooth upgrade of different generations of network services, such that the compatibility of an optical module, to which the optical device is applied, and an optical communication system with regard to different generations of network services can be improved.

The application discloses a wave divider, a wave combiner and an optical communication device, and belongs to the technical field of optical communication. The wave divider comprises a first filter device and a second filter device. The first filter device is used for dividing an input light beam into a first light beam and a second light beam, the first light beam is light of a first wave band, the second light beam comprises light of a second wave band and light of a third wave band, and the first wave band is located between the second wave band and the third wave band. The second filter device is used for dividing the second light beam into a first sub-light beam and a second sub-light beam, the first sub-light beam is light of the second wave band, and the second sub-light beam is light of the third wave band. The width of a first transition wave band range of the first filter device is less than the width of a second transition wave band range of the second filter device, and the first wave band at least partially coincides with the second transition wave band range. The wave combiner has the same device composition as the wave divider, and the transmission process of light is the reverse process of the wave divider. The wave divider and the wave combiner can improve the utilization rate of light.

A coated tool includes a base body and a coating film. The coated tool has a first surface with a rake face, a second surface with a flank face, and a third surface located between the first surface and the second surface and being a C surface or an R surface. The coating film includes a first coating film located on the first surface and / or a second coating film located on the second surface, and a third coating film located on the third surface. A wavenumber of a maximum Raman peak of the first coating film is a first wavenumber, a wavenumber of a maximum Raman peak of the second coating film is a second wavenumber, and a wavenumber of the maximum Raman peak of the third coating film is a third wavenumber. The third wavenumber is smaller than the first wavenumber and the second wavenumber.

The invention belongs to the field of polarization measurement, and particularly relates to a space solar spectrum magnetic field telescope based on multi-wave-plate polarization modulation, which comprises a telescope system, a relay system and a spectrum imaging system, the telescopic system comprises a first 1 / 2 wave plate, a 1 / 4 wave plate and a second 1 / 2 wave plate; when neither the first 1 / 2 wave plate nor the second 1 / 2 wave plate fails, the second wave plate is kept static, and the first wave plate and the third wave plate rotate in the same direction according to a preset different-speed asynchronous motion time sequence, so that the full-stokes component of the solar polarization spectrum is measured; when any one of the first 1 / 2 wave plate and the second 1 / 2 wave plate breaks down, the 1 / 4 wave plate is started, and the 1 / 4 wave plate and the other normally working 1 / 2 wave plate rotate in the same direction according to the re-planned different-speed asynchronous motion time sequence, so that the measurement of the full stokes component of the solar polarization spectrum is maintained. According to the invention, full Stokes measurement can be realized, and the blank of space solar vector magnetic field detection capability in China is filled.

Disclosed is a phase measurement device, comprising: a first wave plate, a first polarization splitting prism, a fourth wave plate, a retroreflector, a third wave plate, a reflector, a second wave plate, a polarizer, a second polarization splitting prism, a third polarization splitting prism, a first photoelectric detector, a second photoelectric detector, and a base, wherein the first to third polarization splitting prisms and the first and second photoelectric detectors are fixed on the base; the first to fourth wave plates are respectively arranged around the periphery of the first polarization splitting prism; the polarizer is arranged on an emitting surface of the third polarization splitting prism; the retroreflector is arranged on an outer side of the fourth wave plate; and the reflector is arranged on an outer side of the third wave plate. An interferometric signal is resolved to obtain a measurement light beam phase.

The present invention discloses an automatic proportional-integral pressure controller, which drives the rotation of a floating plate based on the pressure difference between the actual pressure in the air chamber and the preset pressure, and converts the rotation of the floating plate into the up and down movement of the baffle to adjust the distance between the baffle and the nozzle, thereby changing the output air pressure of the pneumatic amplifier and converting the movement of the mechanical structure into air pressure changes. The output air pressure change controls the opening and closing state and opening degree of the intake valve or exhaust valve, thereby controlling the intake or exhaust of the air chamber; on the other hand, it is transmitted to the third wave spring assembly and the second wave spring assembly. Under the buffering effect of the air storage chamber, the air pressure change of the second wave spring assembly lags, and the pressure difference change between the two plays a feedback regulating role in the rotation of the floating plate. Automatic proportional-integral control of air pressure is achieved by two sets of wave spring assemblies, with fast response speed and high control accuracy. It adopts a purely mechanical structure design with strong anti-interference ability, and the overall structure is simple and easy to assemble and operate.

The present invention discloses a jitter noise injection method for a multi-state combined laser gyroscope, comprising: multiplying a first waveform with a preset second sine wave to obtain a first initial state waveform; multiplying a second waveform with a preset seventh square wave to obtain a third waveform; multiplying a fourth waveform with a preset sixth square wave to obtain a fifth waveform; summing the third waveform and the fifth waveform to obtain a square wave drive waveform; multiplying the square wave drive waveform with a preset third sine wave to obtain a second initial state waveform; multiplying the first initial state waveform with a preset value to obtain a sixth waveform, adding the sixth waveform to the first initial state waveform to obtain a third initial state waveform; subtracting the second initial state waveform from the third initial state waveform to obtain a multi-state drive waveform, multiplying the multi-state drive waveform with a preset fourth sine wave to obtain a final waveform, and injecting the final waveform into the laser gyroscope. The present invention can effectively solve the jitter noise injection problem of multiple types of laser gyroscopes, reduce low-frequency and high-frequency noise, and enrich the noise spectrum near the jitter frequency.

The invention discloses a double-emission-source delay time calculation method and device, equipment and a medium, and the method comprises the steps: firstly, setting that only a far emission source works, obtaining a first wave train of a casing wave excited by the far emission source and received by a first receiver, and obtaining a second wave train of the casing wave excited by the far emission source and received by a second receiver; then calculating a first moment when the head wave in the first wave train arrives and a second moment when the head wave in the second wave train arrives, and then obtaining a third wave train of the casing wave excited by the near-emission source and received by the first receiver and a fourth wave train of the casing wave excited by the near-emission source and received by the second receiver; and calculating a third moment when the head wave in the third wave train arrives and a fourth moment when the head wave in the fourth wave train arrives, thereby calculating the delay time of the double emission sources. The time difference between the head waves of the casing waves excited by the far emission source and the near emission source and the receiver is used as the emission delay time, so that the calculation complexity of the delay time of the double emission sources is effectively reduced.

The invention discloses a detuning aberration reconstruction method and device in complex cylindrical surface pseudo-shear interference detection, and the method comprises the steps: firstly obtaining first wavefront data of a cylindrical mirror to be detected, which is measured by an interferometer, and second wavefront data detected by the interferometer after the cylindrical mirror to be detected moves once in the curvature direction when interference fringes are zeroed; the third wavefront data is detected by the interferometer after the cylindrical mirror to be detected moves once again along the curvature direction; the method comprises the following steps of: firstly, obtaining first-order differential data without maladjustment aberration by using the three wavefront data, then obtaining second-order differential data without maladjustment aberration by using the three wavefront data, then generating first-order differential maladjustment aberration-free wavefront data by using the second-order differential data, and finally obtaining maladjustment aberration generated by the cylindrical mirror to be measured moving along the curvature direction based on the first-order differential maladjustment aberration-free wavefront data. Thus, by reconstructing the maladjustment aberration, the accuracy of the differential wavefront data used when the cylindrical surface shape is reconstructed can be ensured, and the reconstruction precision of the cylindrical surface shape error is further improved.

The application discloses a corrugated plate spacing adjusting device, which comprises a guide fixing seat, a first wave crest clamping mechanism, a second wave crest clamping mechanism, a third wave crest clamping mechanism and a wave crest clamping groove. The first wave crest clamping mechanism, the second wave crest clamping mechanism and the third wave crest clamping mechanism are supported by the guide fixing seat, and the wave crest clamping groove is matched with the wave crest clamping mechanism to accommodate the wave crest of the corrugated plate, so that independent clamping of the wave crest of different corrugated plates is realized. The relative positions of the first wave crest clamping mechanism, the second wave crest clamping mechanism and the third wave crest clamping mechanism are moved, the distance between two corrugated plates is adjusted, the joint width of the two corrugated plates is synchronously adjusted, a plurality of wave crest clamping mechanisms are matched to prevent the corrugated plates from being separated, a stable supporting structure is provided, and the continuity and safety of assembly work are improved.

The invention discloses a CDOM absorption spectrum remote sensing estimation method and system, a medium and equipment. The method comprises the following steps: acquiring actually measured remote sensing reflectivity spectrums of a plurality of point locations on the water surface of an estuary in a flood season and CDOM absorption spectrums of water body samples of the corresponding point locations; the maximum correlation coefficient of the actually measured remote sensing reflectivity spectrum in the first waveband range and the maximum correlation coefficient of the CDOM absorption spectrum in the second waveband range are calculated, the spectral gradient of the actually measured remote sensing reflectivity spectrum in the first waveband range is calculated to serve as the reflectivity short-wave spectral gradient, and the spectral slope of the CDOM absorption spectrum in the second waveband range is calculated to serve as the CDOM short-wave spectral slope; the spectral slope of the CDOM absorption spectrum in the third wave band range is calculated as the CDOM long-wave spectral slope, and a CDOM absorption spectrum inversion model is established; and acquiring a spectrum satellite remote sensing reflectivity image of the river mouth in the flood season, and inputting the image into the model pixel by pixel to obtain the spatial distribution of the CDOM absorption spectrum. According to the invention, the inversion precision can be significantly improved.

The valve stent comprises at least three wave rings arranged in the axial direction, each wave ring comprises a plurality of wave rods connected in the circumferential direction, an included angle is formed between every two adjacent wave rods, and the connecting structure of any two adjacent wave rings is of a grid structure; the at least three wave rings comprise a first wave ring, a second wave ring and a third wave ring which are sequentially connected in the first direction, and the first direction is the direction from the inflow end to the outflow end of the valve stent; at least one vacant wave trough of the second wave ring exists between two adjacent wave crests of the first wave ring, and the vacant wave trough of the second wave ring is turned outwards in the direction away from the axis of the valve support. In the process that the valve stent is implanted into a lesion position to be released, the vacant trough of the second wave ring is turned outwards, so that the vacant trough expands towards the outer side of the valve stent relative to other parts of the valve stent, the vacant trough can be immediately hung on a valve ring of an aortic valve after being released, and the anchoring stability of the valve stent is enhanced.

The application provides a dynamic pressure gas thrust bearing, a rotor assembly and a compressor. The dynamic pressure gas thrust bearing comprises a bearing shell (25), a top foil (21) fixed at one end on the bearing shell (25) and movable at the other end relative to the bearing shell (25), a wave foil mounting space formed between the top foil (21) and the bearing shell (25), a first wave foil (22), a second wave foil (23) and a third wave foil (24), the first wave foil (22), the second wave foil (23) and the third wave foil (24) are sequentially and spacedly arranged in the wave foil mounting space along the airflow direction, and the rigidity of the first wave foil (22) and the third wave foil (24) is greater than that of the second wave foil (23). According to the dynamic pressure gas thrust bearing, a secondary wedge structure can be formed on the surface of the top foil at high speed, and the carrying capacity and adaptive capacity of the bearing in a high-speed environment can be improved.

The utility model relates to the technical field of corrugated boards, in particular to a corrugated board with a honeycomb structure, which mainly solves the problems of low longitudinal compressive strength and poor buffering performance of a honeycomb paperboard in the prior art, and comprises a corrugated board body which comprises a surface layer, a middle layer and a bottom layer, the surface layer comprises a first surface layer, a second surface layer with a wave structure and a third surface layer with a wave structure, the second surface layer is provided with a second wave crest and a second wave trough, the third surface layer is provided with a third wave crest and a third wave trough, the lower surface of the second wave trough is compositely connected with the upper surface of the third wave trough, and the amplitude of the second wave crest is larger than that of the third wave crest; a plurality of grooves are concavely formed in the upper surface of the middle layer, the upper surface of the middle layer is in composite connection with the lower surface of the third surface layer, the third troughs are embedded in the grooves, and the upper surface of the bottom layer is in composite connection with the lower surface of the middle layer.

The invention belongs to the technical field of rubber mat connection of plate heat exchangers, and provides an anti-degumming rubber mat for a heat exchange plate. The anti-degumming pad comprises an anti-degumming pad main body and a sheet main body, the plate sheet main body is arranged on the anti-degumming pad main body and is used for being matched with a hanging groove in a heat exchange plate; the anti-degumming pad main body is provided with a first connecting arm and a second connecting arm; wherein the first connecting arm and the second connecting arm are arranged on one side of the anti-degumming mat main body; the plate sheet main body is provided with a rubber mat groove, a first wave crest, a first wave trough, a first connecting arm groove, a second wave crest, a second wave trough, a second connecting arm groove and a third wave crest; the rubber mat main body is connected with the first connecting arm and the second connecting arm; the rubber mat main body is arranged in the rubber mat groove; the first connecting arm groove and the second connecting arm groove are formed in the outer side of the rubber mat groove; the thickness of the rubber mat groove is equal to the thickness of the first connecting arm and the second connecting arm after compression; the first wave crest, the first wave trough, the second wave crest, the second wave trough and the third wave crest are sequentially arranged along the outer side wall of the plate sheet body.

The invention provides a communication method and a communication device. The method comprises: receiving a first synchronization signal block, the first synchronization signal block comprising a first synchronization signal, the first synchronization signal being associated with N1 first reference signals; measuring the signal strength of the first synchronization signal and the N1 first reference signals to obtain a first measurement result; determining a third beam from the first beam and the M1 second beams according to the first measurement result; and / or determining a fourth beam from at least one beam used by the first communication device according to the first measurement result. Wherein the first wave beam is a sending wave beam of the first synchronization signal, the M1 second wave beams are sending wave beams of N1 first reference signals, the third wave beam is a transmitting-receiving wave beam of the second communication device when communicating with the first communication device, and the fourth wave beam is a transmitting-receiving wave beam of the first communication device when communicating with the second communication device.

The light splitting device comprises a first light splitting piece, a first wave plate, a magneto-optical crystal, a Wollaston prism, a second wave plate, a third wave plate and a second light combining piece which are arranged along a light path, the first wave plate is arranged on one light path after light splitting of the first light splitting part so as to ensure that the polarization state of linearly polarized light input into the magneto-optical crystal is kept consistent; the second wave plate and the third wave plate are respectively arranged in one of emergent light paths of the Wollaston prism; and a coil is arranged outside the magneto-optical crystal. According to the utility model, through currents of different magnitudes, the coil generates magnetic fields of different magnitudes, the magnetic fields of different magnitudes generate different rotation angles, the different rotation angles correspond to different sin2theta and cos2theta, and furthermore, through the Wollaston prism, two polarization states have light splitting of different proportions. And two beams of light with different splitting ratios are formed after beam combination.

A waveguide structure. In some embodiments, the waveguide structure, includes: a first waveguide (105), a second waveguide (120), and a third waveguide (125) on a substrate (115). The first waveguide (105) may be at a different height than the second waveguide (120). The waveguides may be configured to cause light to couple between the first waveguide (105) and the second waveguide (120), and between the second waveguide (120) and the third waveguide (125). The first, second, and third waveguides (105, 120, 125) may be composed of respective materials having a first index of refraction, a second index of refraction, and a third index of refraction respectively. The third material may include silicon and nitrogen. The second index of refraction may be greater than the first index of refraction, and less than the third index of refraction.

A liquid ejection head includes nozzles, pressure chambers communicating with the nozzles, volumes thereof being varied to eject liquid through the nozzles, an actuator varying the volumes according to drive waveforms respectively applied to the chambers, a signal processing circuit configured to, upon receipt of an instruction, acquire first data indicating first waveforms and second data indicating second waveforms, and determine third waveforms based on differences between the first and second waveforms, the third and second waveforms being applied to the chambers at first and second timings, and a drive circuit configured to output the drive waveforms generated by the signal processing circuit to the pressure chambers. One of the third drive waveforms is different from or identical to a corresponding one of the first drive waveforms depending on whether said one of the first drive waveforms and a corresponding one of the second drive waveforms match a predetermined pattern.

The application provides a fin and a heat exchanger with the same, the fin comprising: a first connecting section, a second connecting section and a third connecting section, the second connecting section being used for bending, the second connecting section having oppositely arranged first and second connecting ends, the first connecting end being arranged on the side of the second connecting end away from the third connecting section; along the length direction of the second connecting section, the second connecting section is in a straight strip structure before bending, and is in an arc strip structure after bending; the first, second and third connecting sections are all in a corrugated structure, the first connecting section has a first wave distance Fp1, the second connecting section has a second wave distance Fp2, and the third connecting section has a third wave distance Fp3; wherein, Fp2>Fp1 and Fp2>Fp3. Through the technical scheme provided by the application, the technical problem that the fin is inconvenient to bend in the prior art can be solved, the heat exchange performance of the product can be improved, the heat exchange area can be increased, and the corrosion resistance of the product can be improved.

The invention discloses an optical module. An absolute value of a wavelength interval between a first optical signal and a second optical signal is located in a first preset range. The light receiving component comprises a first lens and a light splitting assembly. The light splitting assembly comprises a substrate, a first wave plate, a second wave plate and a third wave plate, the first wave plate is located between the light emitting component and the first lens so that the first optical signal can be reflected and the second optical signal can be transmitted. The second wave plate is located on a reflection light path of the first wave plate, and the third wave plate is located between the second wave plate and the light receiving assembly. The first shell is provided with a storage groove, an adhesive layer is arranged between the first lens and the bottom face of the first shell, the thickness of the adhesive layer is located in a second preset range, and the difference value between the size of the storage groove and the size of the first lens is larger than a preset value so that the first lens can be actively coupled and attached to the first shell. The first lens is mounted on the first shell in an active coupling mode so as to adjust the optical signals reflected and transmitted by the first wave plate, so that the first optical signals and the second optical signals are separated.

Provided in the present application are an optical device, an optical module and an optical communication system. The optical device provided in the present application comprises a tube body, and a first receiving encapsulation structure, a second receiving encapsulation structure and a first emitting encapsulation structure, which are installed on the tube body, wherein the first receiving encapsulation structure encapsulates a first light-receiving chip which is used for receiving light of a first wave band; the second receiving encapsulation structure encapsulates a second light-receiving chip which is used for receiving light of a second wave band, and a third light-receiving chip which is used for receiving light of a third wave band; and the first emitting encapsulation structure encapsulates a first light-emitting chip which is used for emitting light of a fourth wave band, and a second light-emitting chip which is used for emitting light of a fifth wave band. The optical device provided in the present application can integrates three receiving light paths together with three emitting light paths, and can realize the compatibility with regard to three generations of network services, so as to realize the smooth upgrade of different generations of network services, such that the compatibility of an optical module, to which the optical device is applied, and an optical communication system with regard to different generations of network services can be improved.

The application relates to the lighting technical field, and particularly discloses a full-spectrum light source and a manufacturing method and application. The full-spectrum light source comprises a light source chip and encapsulating glue, and the encapsulating glue is mixed with compounded fluorescent powder; the light source chip is a first waveband piece with an emission peak value of 410-420 nm, a second waveband piece with an emission peak value of 430-440 nm, a third waveband piece with an emission peak value of 445-460 nm and a fourth waveband piece with an emission peak value of 465-475 nm; and the compounded fluorescent powder is blue-green fluorescent powder with an emission peak value of 490-500 nm, green fluorescent powder with an emission peak value of 525-535 nm and red fluorescent powder with an emission peak value of 650-660 nm. The full-spectrum light source has full coverage of 380-780 nm, good spectral continuity, no obvious wave peak and wave trough, uniform spectral proportion without serious disorder, strong color rendering and close to the sunlight spectrum.

The invention discloses an inverter switching time test method and device, equipment and a storage medium. The method comprises the following steps: acquiring a target power value, controlling the operation of electrical equipment based on the target power value, and putting a reactive load into work; respectively acquiring a first waveform and a second waveform of an alternating current input end and an alternating current output end of the inverter by utilizing acquisition equipment; after the contactor is disconnected, acquiring a third waveform and a fourth waveform of the alternating current input end and the alternating current output end of the inverter respectively by utilizing acquisition equipment; and obtaining an inverter input waveform based on the first waveform and the third waveform, obtaining an inverter output waveform based on the second waveform and the fourth waveform, and determining the switching time of the inverter according to the inverter input waveform and the inverter output waveform. According to the scheme, the dynamic characteristics of the switching process are precisely restored through dual-channel waveform acquisition, the response capability and the switching performance of the inverter in a power-off scene are effectively evaluated, and the method is suitable for performance testing of scenes such as a distributed optical storage system and household emergency power supply.

The invention provides a method and a device for determining the state of charge of a flow battery. Emitting multi-band detection laser to the electrolyte in the flow channel of the flow battery, and synchronously collecting scattered light signals and fluid parameters after being scattered by the electrolyte; determining a basic state of charge according to a first spectrum characteristic value of the second wave band laser in the collected scattered light signal; determining hydrodynamic characteristics according to the flow velocity and the viscosity, and correcting the basic state of charge by using the hydrodynamic characteristics to determine a first state of charge; determining the temperature of the electrolyte according to the spectral response difference characteristics of the first wave band laser and the third wave band laser in the scattered light signal; determining the concentration of the electrolyte according to a second spectrum characteristic value of the second wave band laser in the scattered light signal; and determining a target state of charge of the flow battery according to the first state of charge, the temperature of the electrolyte and the concentration of the electrolyte. Therefore, the accuracy of determining the charge state of the flow battery is improved.

Examples of fault location in a power transmission line connecting a first and a second terminal is described. In an example, arrival times of a first peak, a second peak, and a third peak of a travelling wave detected from measurements carried out at the first and second terminals is detected. A rise time associated with the first peak of the travelling wave is calculated. One of a first half and a second half of the power transmission line is identified, as having a fault, based on a comparison of the rise time. One of a first segment, a second segment, a third segment, and a fourth segment of the power transmission line is identified as having the fault. Length of the power transmission line is estimated. The fault location is estimated based on identification of one of the first, second, third, and fourth segments as having the fault.

The present invention discloses a remote sensing estimation method, system, medium and device for the CDOM absorption spectrum. The method includes: obtaining the measured remote sensing reflectance spectra of several points on the water surface of the estuary during the flood season, and the CDOM absorption spectra of the water samples at the corresponding points; calculating the maximum correlation coefficient between the measured remote sensing reflectance spectra in the first band range and the CDOM absorption spectra in the second band range, calculating the spectral gradient of the measured remote sensing reflectance spectra in the first band range as the reflectance short-wave spectral gradient, calculating the spectral slope of the CDOM absorption spectra in the second band range as the CDOM short-wave spectral slope, calculating the spectral slope of the CDOM absorption spectra in the third band range as the CDOM long-wave spectral slope, and establishing an inversion model for the CDOM absorption spectrum; obtaining the spectral satellite remote sensing reflectance image of the estuary during the flood season, and inputting each pixel into the model to obtain the spatial distribution of the CDOM absorption spectrum. Using the present invention can significantly improve the inversion accuracy.

An object detector includes a wave transmitter to transmit a modulated wave in a predetermined frequency range to an object, a first wave receiver to receive sound waves and to generate a first wave reception signal indicative of the reception of the sound waves, a second wave receiver to receive sound waves and to generate a second wave reception signal indicative of the reception of the sound waves, an adder to generate a third wave reception signal by adding the first and second wave reception signals, and a controller to detect the object based on the third wave reception signal by causing the wave transmitter to transmit the modulated wave. The second wave receiver is farther from the wave transmitter than the first wave receiver. A fluctuation range of the third wave reception signal is not greater than a fluctuation range of the first wave reception signal.