65results about How to "Control sensitivity" patented technology

The invention discloses a method and device for controlling adaptive optimization switching for a heterogeneous converged wireless network. The method comprises the following steps: selecting a sensitivity control mode; periodically monitoring network state information of a user terminal and processing the network state information of the user terminal; confirming the current scene of the user terminal according to the processed network state information of the user terminal; confirming a sensitivity parameter value of the user terminal according to the current scene of the user terminal; performing a normalizing operation on all alternative network attributes of the user terminal according to the confirmed sensitivity parameter value; confirming a score of each alternative network by adopting a multi-attribute decision strategy according to a result of the normalizing operation; sorting on the basis of the scores; and confirming a target network, to which a mobile terminal is switched, according to a sorting result and a judging system. According to the method, the ping-pong vertical switching caused in a moving process of the user terminal during is reduced and the user experience for service quality is promoted.

The invention discloses a method for identifying irregular wave troughs of a pulse wave signal, belonging to the technical field of pulse wave signal identification. The method comprises the following steps of: identifying one section of input pulse signal and extracting one typical pulse wave period; intercepting data of a declining branch part in the typical period, and carrying out vertical coordinate transformation to convert the traditional stepped untypical wave crests and wave troughs into typical wave crests and wave troughs and further identify the positions of maximum values and minimum values of the transformed data; and finally, amending the positions of the identified maximum values according to data which are not transformed, and marking the positions of the finally-identified wave crests and wave troughs of pulse wave and outputting the positions for analysis. According to the method disclosed by the invention, the missed identification and mistaken identification of a pulse condition analytical instrument on untypical wave crests and wave troughs can be solved, the stepped untypical wave crests and wave troughs can be effectively identified and new hardware equipment is prevented from being modified or added; and the method is particularly suitable for the traditional pulse condition analysis instrument.

The invention discloses a preparation method for a conductive sensing textile based on graphene and relates to the technical field of flexible wearable electronic devices. The graphene conductive sensing textile disclosed by the invention is prepared by adopting a three-dimensional braiding and compounding technology; a base of the graphene conductive sensing textile is composed of a textile whichis obtained by mixing and braiding conductive yarns and common yarns; a dielectric substrate is composed of a common textile with good dielectric properties; and all the parts are combined through asimple compounding technology to form a whole body. Under the action of applied pressure, a sandwich structure of the textile is deformed, so that the working resistance of the textile is changed; a pressure deformation condition of the sandwich structure of the textile is reversely inferred through monitoring a current-voltage signal, so that a textile pressure-resistance sensing and monitoring function is realized; and a novel design thought is provided for a structural design of multifunctional textiles and intelligent textiles.

The invention relates to detection of organic phosphorus pesticide, in particular to a method and a device for detecting organic phosphorus pesticide. The method comprises the following concrete steps: inserting an ion selective electrode into a measuring pool and adopting seeped inner filling liquid during electrode detection as a substrate to generate a contrast signal; inserting the electrode into the measuring pool containing butyrylcholine esterase and standard pesticide and adopting the seeped inner filling liquid during electrode detection as the substrate to generate a standard signal; obtaining a standard curve by a potential difference of the standard signal and the contrast signal; finally inserting the electrode into the measuring pool containing butyrylcholine esterase and a sample to be detected and adopting the seeped inner filling liquid during electrode detection as the substrate to generate a sample signal; and obtaining the concentration of the organic phosphorus pesticide to be detected by the potential difference. The device adopts the structure that butyrylcholine inner filling liquid is contained in the electrode, an internal reference ratio electrode is inserted into the butyrylcholine inner filling liquid, and the bottom of the electrode is stuck with a polymer sensitive film. The electrode inner filling liquid can continuously seep, the enzyme substrate is generated at the original site of the surface of the electrode without manually adding the substrate, the operation is simple and convenient, and an error is prevented.

The application provides an electric field intensity measurement device and method of an electrostatic field. The device comprises an induction electrode plate, an upper pole plate, a lower pole plate, an annular channel, an electromagnetic field source module and a signal processing module. The induction electrode plate is electrically connected with the upper pole plate; the annular channel comprises a first straight channel, a second straight channel and two sections of arc channels; the first straight channel is arranged between the upper pole plate and the lower pole plate; bubbles, magnetic fluid or liquid-state metal are filled in the annular channel; at least one electromagnetic field source module is sleeved on the arc channel or the second straight channel; the electromagnetic field source module comprises a magnet, a positive plate and a negative plate; the lower pole plate is electrically connected with the signal processing module, the signal processing module is used forconverting a periodic current signal output by the lower pole plate into the periodic voltage signal, and computing the electric field intensity according to the periodic voltage signal. The electricfield intensity measurement device and method of the electrostatic field provided by the application have the advantages of being small in volume, high in measurement result reliability, stable in operation, and long in service life.

The invention relates to a two-end micro-electro-mechanical system (MEMS) microphone which comprises a micro- capacitance sensor MEMS, a bias voltage supply circuit VBAIS and a dedicated integrated circuit ASIC which are electrically connected. A voltage input end of the bias voltage supply circuit VBAIS is electrically connected with a power supply and signal output end VDD & VOUT. A signal output end VOUT and a power supply end VDD of a three-end MEMS microphone in the prior art are combined into one port so that an original three-end component is converted into a two-end component, and therefore the MEMS microphone is improved is improved in integration level and is convenient to use. An RC circuit is connected between a signal output end of the dedicated integrated circuit ASIC and a grounding end of the dedicated integrated circuit ASIC and can be used to adjust static working current and sensitivity so that control of static current and sensitivity of the MEMS microphone can be achieved through reasonable selection of RDC and RAC values in the RC circuit, and therefore adjustments are convenient.

The invention provides a magnetic field sensor using a semiconductor film field effect transistor structure and capable of controlling flexibility appropriately. The magnetic sensor includes a semiconductor film, a drain electrode, a source electrode, a grid electrode, a first Hall electrode and a second Hall electrode. Due to drain electrode voltage applied to the drain electrode and the grid electrode applied to the grid electrode, a channel area allowing drain electrode current to flow through the semiconductor film may exist between the drain electrode and the source electrode. Hall voltage may be generated between the first Hall electrode and the second Hall electrode due to the drain electrode current and the magnetic field in the channel area. The value of the grid electrode voltage applied to the grid electrode is greater than the minimum permit grid electrode voltage value and is not less than a low voltage range of the minimum permit grid voltage value.

The invention discloses a monitoring device for the corrosion rate of steel rebar in a reinforced concrete structure. The monitoring device comprises a stainless steel ring sheet, a stainless steel ring sheet fixing bracket, a stainless steel ring sheet fixing beam, a wire and a detection part, wherein the stainless steel ring sheet fixing beam is fixed on a stirrup; the stirrup and to-be-monitored steel rebar are located in concrete; one end of the stainless steel ring sheet fixing bracket is connected with the stainless steel ring sheet fixing beam; the other end of the stainless steel ring sheet fixing bracket is connected with the stainless steel ring sheet; the stainless steel ring sheet is of a circular structure formed by surrounding of a strip-shaped stainless steel sheet of which two ends are separated; the middle of the stainless steel ring sheet is of a hollow structure, the to-be-monitored steel rebar passes through the middle of the stainless steel ring sheet and a gap is formed between the stainless steel ring sheet and the to-be-monitored steel rebar; and two ends of the stainless steel ring sheet are connected with the detection part through the wire separately. According to the device and the method, long-term monitoring of the corrosion rate of the steel rebar under the condition of not damaging the concrete can be achieved at relatively low cost.

The invention discloses a targeting method, a device, an electronic device and storage media in a shooting game, wherein the method comprises the following steps of: providing a displacement control area in a graphical user interface, controlling a virtual shooting body to move in the game scene according to the first sliding operation acting on the displacement control area; providing a targetingcontrol area on the graphical user interface, and detecting a second sliding operation acting on the targeting control area; controlling the targeting direction of the virtual shooting body with a first sensitivity according to the second sliding operation acting on the targeting control area when the time from the end of the first sliding operation is detected to be less than a preset thresholdvalue, controlling the targeting direction of the virtual shooting body with a second sensitivity according to the second sliding operation acting on the targeting control area when the time from theend of the first sliding operation is detected to be large than the preset threshold value. By using the method, the operating efficiency in the interactive process is improved, and the user experience is improved.

The invention discloses an equipment fault early warning method based on maintenance records. The equipment fault early warning method based on the maintenance records comprises the following steps ofstep 1.acquiring a maintenance record table; step 2.counting the total number of all equipment with the type l in a room k; step 3.repeating the steps 4 and 5 for all fault types possibly occurring in the equipment with the type l in the room k; step 4.counting maintenance frequency of each equipment i with the type l in the room k in a certain time period due to a fault j; step 5.counting maintenance frequency of equipment d needing detection and early warning in a certain time period due to the fault j; step 6.setting an influence factor and an early warning threshold value; step 7.settingan early warning threshold value corresponding to the equipment type l in the room k; step 8.computing values of early warning indexes I1 and I2; step 9.if I1 is not less than 0, triggering the same fault early warning of the same type of equipment; if I2 is not less than 0, triggering repeated fault early warning of the same equipment; and step10.resetting final triggering early warning time.

Provided is an integrated double-frequency card reader device composed of a microprocessor STM32F101 circuit, a power circuit, a liquid crystal display circuit, an induction antenna and read-write circuit, a JTAG interface circuit, a STM32_ISP download circuit, and a Wiegand signal circuit. The induction antenna and read-write circuit comprises a 13.56 read card module and a 2.4G read card module. A jumper interface J6 selects a real operation module. The microprocessor STM32F101 circuit exchanges data with an external radiofrequency application via the read card module and transmits Wiegand information to a master control board via the Wiegand circuit, and transmits corresponding display information to the liquid crystal display circuit to be displayed. The STM32_ISP download circuit and the JTAG interface circuit upgrade and debug slave computer system software. The power circuit supplies power to all parts of the card reader device. The integrated double-frequency card reader device is high in reliability and can be expanded highly efficiently.

The invention relates to a pushing-type baby walking chair which comprises a pushing handle used for a baby to hold and push and idler wheels on the lower portion. The pushing handle is connected with the idler wheels through support rods. The support rods are arranged in radiation extending mode around the set center to form a triangular structure that a front support rod is arranged on the front side, two back support rods are located at the back of the front support rod, and the two back support rods are arranged on the left side and the right side of the front support rod. The idler wheels comprise a front idler wheel connected with the front support rod and a left back idler wheel and a right back idler wheel which are connected with the two back support rods. The pushing-type baby walking chair enables the baby to learn walking by holding and pushing the chair, can develop walking awareness of the baby, avoids negative effects of a traditional baby walking chair, and is stable and firm in structure and convenient to steer due to the fact that a three-wheel type frame structure formed by the three support rods is adopted. The baby can conveniently grasp direction by means of the baby walking chair.

The invention discloses a method for improving the refractive index detecting sensitivity of long period fiber gratings. The detecting sensitivity is improved by quickly and controllably preparing zirconium dioxide or tantalum pentoxide nano films in proper thickness on the surfaces of the long period fiber gratings through liquid deposition. The method has the advantages that expensive instruments and equipment are not needed; the operation process is simple and convenient; the time spent on regulating the sensitivity of the long period fiber gratings is saved; the refractive index regulation efficiency of the long period fiber gratings is improved; the cost needed for manufacturing long period fiber grating sensors with high sensitivity is reduced.

The invention provides a preparation method for a fabric tension sensor. The preparation method comprises the following steps: selecting a high-elasticity yarn, weaving a fabric from the yarn, using the fabric as a medium substrate for an antenna and testing and calculating the dielectric constant and dielectric loss of the fabric; calculating the basic size of a radiation element of the antenna according to calculation results obtained in the previous step and work frequency needed by the antenna and weaving the radiation element, a feeder line and an earth plate of the antenna from an elastic conductive yarn and the high-elasticity yarn; and carrying out vertical binding of the yarns and weaving an integral fabric antenna structure from each part, wherein when the fabric antenna structure suffers tensile deformation, frequency changes are obvious and present a linear rule. According to the invention, a fabric structure prone to tensile deformation is combined together with an antenna element, thereby obtaining a tension sensing fabric with both a wireless signal transmission function and a tension sensing function; the sensing fabric has good structural integrity and has the characteristic of stable, uniform and predicable deformation under the action of outside force; and the prepared fabric tension sensor is low in cost, stable in performance and favorable for promotion and application.

The invention relates to a double-acting pressure relief blowout preventer, which includes an overflow pipeline, a valve body and a valve driver. The valve body includes a valve body pipeline. A pressure-sensing reed is sealed at the top of the pressure-sensing tube, a partition block is connected to the other end of the pressure-sensing tube, and a floating piston is connected to the other end of the pressure-sensing tube through the partition block, and the floating piston is slidingly connected to the partition block through a push rod. A valve block is fixed on the end of the push rod, connecting nozzles are provided at both lateral ends of the flow passage, a sliding hole is provided in the middle of the flow passage, and an annular conduction groove is provided on the valve block. A pressure relief pipeline and a pressure relief pipeline communicating with the connecting nozzle are arranged in the overflow pipeline, and the diameter of the pressure relief pipeline corresponds to the width of the conduction groove; a pressure sensing plate is connected to the top of the pressure sensing tube; A pressure-sensing cavity is provided at the end of the valve body pipeline facing away from the flow-through pipeline, and the pressure-sensing cavity is connected with the oil pipeline, and a pressure-discharging hole is provided in the middle of the pressure-sensing plate.

The invention discloses an acceleration sensing device based on symmetrical graphene nanobelts. The acceleration sensing device is characterized by comprising a base layer at the bottom layer; a first strip graphene nanobelt and a second strip graphene nanobelt that are of the same size and are arranged symmetrically are arranged on the upper surface layer of the base layer; and micro-nano fiber straight waveguide is arranged between the first strip graphene nanobelt and the second strip graphene nanobelt. The first strip graphene nanobelt and the second strip graphene nanobelt form a graphene-medium-graphene symmetrical surface plasma waveguide structure. The device can adjust the transmission characteristic of a surface plasma mode by adjusting the thickness of the optical fiber waveguide, thereby controlling the peak of resonant wavelength of an output signal so as to control the sensitivity of a sensor. The device overcomes the defect that the sensor of a microelectronic mechanical system is limited by external environment and self attributes, and solves the problems of long response time and low sensitivity of conventional micro ring sensors.

The invention discloses a polarization-induced fading resisting method and an alarming algorithm for optical fiber bragg grating sensing signals. Firstly, interference signals reflected back by two adjacent fiber bragg gratings are received by using a tri-state polarization diversity receiver, and interference signals having an uncertain polarization state are divided into three paths and then aremodulated by a signal generator of a system to form three groups of phase-shifted light intensity signals of each path; then, the three groups of phase-shifted light intensity signals of each path are compared with each other in a sampling time period to solve the interference contrast of the three paths of phase-shifted light intensity signals, the path with the best contrast in the three pathsof phase-shifted light intensity signals is determined, and then the phase demodulation of the vibration of an optical fiber sensor is performed by combining a three-step phase shift algorithm; and then a discrete difference algorithm is used to process a phase signal sequence and set an alarm threshold value, and whether an alarm is sent or not is judged by counting the number of discrete difference signals exceeding the threshold value after the difference. The method for determining the contrast of the interference signals has high real-time performance and high accuracy; and the alarming algorithm has high dynamic signal change monitoring capability, high precision and high environmental interference resistance.

The invention discloses an acoustic surface wave type humidity sensor based on conductive polymer composite nano-fibre and a preparation method thereof. The acoustic surface wave type humidity sensor is prepared by depositing polyaniline and polyvinyl butyral composite nano-fibre on an acoustic surface wave device by adopting an electrostatic spinning method. The acoustic surface wave type humidity sensor has good response linearity and rapid response in a wide humidity range and also has high response sensitivity of being up to 75 kHz / %RH. For low-humidity detection, the acoustic surface wave type humidity sensor also has higher sensitivity and response linearity and is capable of detecting 0.5%RH extra-low humidity. The preparation method disclosed by the invention is simple, convenient and easy to do; the prepared acoustic surface wave type sensor can be widely applied to detecting and controlling environmental humidity in industrial and agricultural production, storage, weathers and daily lives; and signal wireless and remote transmission can be conveniently realized.

The invention discloses mechanical underwater depth fixing releaser which includes a housing, A movable block is arranged inside the housing, the cross-sectional areas of the two ends of the movableblock are different, a triggering mechanism is provided at one end of the movable block, A water inlet hole is arranged on the housing, The movable block is subjected to pressure difference under seawater pressure, a first spring applied to the movable block and a reverse resistance to the pressure difference is arranged between the movable block and the shell, and with the change of seawater pressure, when the pressure difference reaches a set critical point, the movable block pushes the triggering mechanism to generate some mechanical actions, thereby completing the designated work. The releaser of the invention is mechanical, does not use any sensor and electronic equipment, works very reliably and stably, can be used for releasing and throwing loads at any depth under water, and has wide application range.

The invention relates to the technical field of strain sensors, and in particular, relates to a preparation method of a high-sensitivity piezoresistive strain sensor. The method comprises the steps: adding distilled water into polyvinyl alcohol, firstly swelling, then stirring and heating until the polyvinyl alcohol is completely dissolved to prepare polyvinyl alcohol gel, and cooling to room temperature for later use; dropwise adding a glutaraldehyde solution into the polyvinyl alcohol gel, uniformly stirring, and standing at room temperature to obtain polyvinyl alcohol / glutaraldehyde gel; dropwise adding a prepared ferric trichloride aqueous solution into the polyvinyl alcohol / glutaraldehyde gel, uniformly stirring, immediately transferring into a polytetrafluoroethylene mold, freezing,and freeze-drying to obtain a ferric trichloride / polyvinyl alcohol composite membrane; and adding a pyrrole monomer into an aqueous solution of acetonitrile, uniformly stirring to form a monomer solution, soaking the ferric trichloride / polyvinyl alcohol composite membrane into the monomer solution, reacting at room temperature, and washing with methanol to obtain a polypyrrole / polyvinyl alcohol composite membrane, namely the high-sensitivity piezoresistive strain sensor.

The invention discloses a polytetrafluoroethylene waterproof gas-permeable membrane and a preparation method thereof, and relates to a polytetrafluoroethylene waterproof gas-permeable membrane which is suitable for a gas sensor and has good gas permeability and hydrophobic property, and a preparation method thereof. The invention relates to the polytetrafluoroethylene waterproof breathable membrane which is prepared by the steps: uniformly mixing a polytetrafluoroethylene emulsion base material, pore-forming filler zinc oxide and aluminum oxide, and cross-linking dispersing auxiliary agents anhydrous sodium sulfate and sodium chloride, and carrying out mould pressing sintering and turning processing to obtain a membrane base material; the membrane base material is prepared through the procedures of pore forming agent removal, drying, hydrophobic treatment and irradiation; and the weight ratio of the polytetrafluoroethylene emulsion base material to the pore-forming agent filler zinc oxide to the pore-forming agent filler aluminum oxide to the crosslinking dispersing auxiliary agent anhydrous sodium sulfate to the crosslinking dispersing auxiliary agent sodium chloride is (40%-80%):(10%-40%):(10%-40%):(2%-10%). The problem that the sensitivity of a gas sensor is too high due to the fact that the ventilation volume of an existing waterproof breathable membrane cannot be controlled is solved, and the gas sensor can be sealed more easily.

The invention provides a pixel unit with a wide dynamic range, a manufacturing method thereof, and an image sensor formed by the same. The pixel unit comprises a photoelectric diode, a transmission gate transistor, a floating diffusion node, a reset resistor, a source follower transistor and a row gate transistor which are formed on the same substrate. The pixel unit further comprises a PINNED structure connected with the floating diffusion node. The pixel unit realizes the nonlinear sensitivity of the image sensor through controlling depletion voltage of the PINNED structure. The manufacturing method is simple in process and compatible with the CMOS manufacturing process in the prior art. The image sensor provided by the invention adopts the pixel unit with the PINNED structure to form a pixel array, realizes the nonlinear sensitivity of the image sensor, not only can improve control for an overexposed area by the image sensor, but also can improve the visibility of a dark area, thereby improving the dynamic range of the image sensor.

The invention provides a device and method for regulating and controlling the sensitivity of a silicon nanowire sensor through light. The device comprises the silicon nanowire sensor used for outputting a sensitive signal of a test target object and converting the sensitive signal into an electric signal, a light source used for providing preset illumination intensity for the silicon nanowire sensor, an optical power regulator which is used for regulating preset illumination intensity, and a signal processor which is used for carrying out signal processing and feedback. According to the device, the power-adjustable light source is arranged at the top end of the silicon nanowire sensor to change the illumination condition around the silicon nanowire sensor, so that the function of regulating and controlling the sensitivity is realized. According to the method, the silicon nanowire sensor has different response sensitivities under different illumination intensities, and the sensitivity of the sensor is regulated and controlled by setting proper illumination conditions. The device is simple in structure, convenient to operate and free of damage to the device, and the sensitivity of the silicon nanowire sensor can be conveniently and effectively regulated and controlled.

The invention discloses a monitoring device for the corrosion rate of steel rebar in a reinforced concrete structure. The monitoring device comprises a stainless steel ring sheet, a stainless steel ring sheet fixing bracket, a stainless steel ring sheet fixing beam, a wire and a detection part, wherein the stainless steel ring sheet fixing beam is fixed on a stirrup; the stirrup and to-be-monitored steel rebar are located in concrete; one end of the stainless steel ring sheet fixing bracket is connected with the stainless steel ring sheet fixing beam; the other end of the stainless steel ring sheet fixing bracket is connected with the stainless steel ring sheet; the stainless steel ring sheet is of a circular structure formed by surrounding of a strip-shaped stainless steel sheet of which two ends are separated; the middle of the stainless steel ring sheet is of a hollow structure, the to-be-monitored steel rebar passes through the middle of the stainless steel ring sheet and a gap is formed between the stainless steel ring sheet and the to-be-monitored steel rebar; and two ends of the stainless steel ring sheet are connected with the detection part through the wire separately. According to the device and the method, long-term monitoring of the corrosion rate of the steel rebar under the condition of not damaging the concrete can be achieved at relatively low cost.

The invention discloses a rotor vibration protection method based on harmonic component decomposition. Shaft vibration data from a front bearing bush and a rear bearing bush on the same rotor are acquired, and subjected to harmonic component decomposition to obtain X-direction and Y-direction rotor first-order vibration in-phase components; vibration conditions of the rotor are determined through variation and comparison of such data, and then a determination can be made on whether trip protection is carried out. Compared with the prior art, the rotor vibration protection method based on harmonic component decomposition has the following advantages: monitoring the vibration of the entire rotor can be achieved through analysis of the vibration data from the bearing bushes for a front shaft and a rear shaft; moreover, with sectionalized protection set up for shaft vibration values, and protection maloperation caused by single-point protection is avoided, and the case of falsely triggered trip can be effectively avoided; according to tracking of values within normal periods of time, a reference base can be updated in real time and abnormal conditions of rotor vibration can be determined rapidly, and accordingly, a determination can be made on whether trip is triggered. In such a way, the case that protection is influenced by frequent trip of the unit that is oversensitive due to interference of background vibration in some situations is avoided.

The invention relates to the technical field of strain sensors, in particular to a preparation method of a high-sensitivity piezoresistive strain sensor. The method comprises: adding distilled water to polyvinyl alcohol, first swelling and then stirring and heating until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol gel, which is cooled to room temperature for later use; adding glutaraldehyde solution dropwise to the polyvinyl alcohol gel In the gel, stir evenly and place it at room temperature to prepare polyvinyl alcohol / glutaraldehyde gel; add the prepared ferric chloride aqueous solution to the polyvinyl alcohol / glutaraldehyde gel dropwise, and transfer it to Freeze in a polytetrafluoroethylene mold, and then freeze-dry to prepare a ferric chloride / polyvinyl alcohol composite film; add pyrrole monomer to an aqueous solution of acetonitrile, stir to form a monomer solution, and ferric chloride / polyvinyl alcohol The polyvinyl alcohol composite film is immersed in the monomer solution, reacted at room temperature, and then washed with methanol to obtain a polypyrrole / polyvinyl alcohol composite film, which is the high-sensitivity piezoresistive strain sensor.

The invention relates to a multichannel light detection apparatus. A voltage gain regulator is used for generating a voltage gain adjusting signal. A voltage gain controller is used for receiving the voltage gain adjusting signal and a first electrical signal transmitted by a temperature compensating module, superposing the two signals and outputting a voltage gain control signal to a bias power supply. The temperature compensating module is used for collecting operating temperatures of a plurality of light sensors in real time, converting the operating temperatures into the first electrical signal and feeding the first electrical signal back to the voltage gain controller. One bias power supply is used for receiving the voltage gain control signal and generating a bias voltage according to the size of the voltage gain control signal. The plurality of light sensors are used for receiving bias voltages so as to control sensitivities of the plurality of light sensors and are used for receiving optical signals, converting the optical signals into second electric signals and outputting. Therefore, one bias power supply can be used to provide the bias voltages needed by the plurality of light sensors and detection of multichannel light signals is realized.