79results about How to "The detection signal is stable" patented technology

The invention discloses a micro-fluidic chip detection system for flow detection. The micro-fluidic chip detection system comprises a detection flow channel (1) and a micro capacitance signal measurement electric circuit (2), wherein both sides of the detection flow channel (1) are symmetrically provided with a liquid state micro electrode flow channel (3) for forming a liquid state metal micro electrode, and the two liquid state micro electrode flow channels (3) are connected with the micro capacitance signal measurement electric circuit (2). According to the present invention, the micro electrodes are formed on both sides of the detection flow channel to carry out electricity detection, such that the detection signal is stable, and detection sensitivity of the capacitance signal in the detection flow channel can be improved; contacting of the liquid state micro electrode and the detected liquid is not required, and electricity detection can be performed through capacitance measurement, such that interference of the electrode on the detected liquid can be minimized; and the production manner for the liquid state micro electrode is simple, and design and production of the micro electrode and production of the micro fluidic chip micro channel are integrated so as to substantially simplify the production process of the micro electrode.

The invention discloses a biomolecular functionalized graphene / gold nano-particle composite film and a preparation method thereof, belonging to the technical field of inorganic film material. The composite film is obtained by self-assembly of graphene reduced and functionalized by bovine serum albumin and gold nano-particle electrostatic layer, wherein the chemical general formula is PEI / BSA-G- / (BSA-G+ / AuNPs)n; PEI is polyetherimide; BSA-G- is laminated bovine serum albumin functionalized graphene with negative charge; AuNPs is gold nano-particle; n is the layer number of multilayer film; andthe thickness of the film is 15-500 nm. The laminated graphene with negative charge and gold nano-particles are assembled on a substrate repeatedly by electrostatic layer assembly technology to obtain an ordered and high-dispersion graphene / gold nano-particle three-dimensional composite film; and the instrumentation of the graphene material is achieved. The composite film can be widely applied inelectro-catalysis and sensing field, and as a surface enhanced Raman substrate.

The invention discloses a Fe-Ga material based magnetostriction liquid-level sensor. The liquid-level sensor is composed of a sensor head, a measuring rod and a floater, the sensor head is connected with the measuring rod in a threaded manner, and the moving floater sleeves the lower portion of the measuring rod. The sensor head is of a cylindrical structure, and a hardware circuit system, a detecting device and a front damping device are arranged in the sensor head. A Waveguide wire is made of Fe-Ga materials and arranged in the measuring rod. The front end of the waveguide wire enters the sensor head through a threaded hole and sequentially penetrates a coil frame in the detecting device and the center of the front damping device till to the hardware circuit system. The tail end of the waveguide wire penetrates the center of a rear damping device to be connected with a return lead, the return lead is connected to a hardware circuit to form a closed loop. The Fe-Ga alloy is used as materials of the waveguide wire of the magnetostriction liquid-level sensor and can be applied to wide-range liquid-level sensors, and the Fe-Ga material based magnetostriction liquid-level sensor can stably work in the severe environment.

The invention provides a connecting structure of rotary connector and steering angle sensor which can reduce noise. In the connecting structure of a first rotor member (rotor housing) of a rotary connector and a second rotor member (rotary member) of a steering angle sensor, an intermediate elastic member is interposed between both rotor members and in a clamped state, connecting protrusions and of the first rotor member are engaged with a pair of engaging notched portions of the intermediate elastic member, and connecting protrusions of the second rotor member are engaged with another pair of engaging notched portions. A line connecting the pair of engaging notched portions is orthogonal to a line connecting the pair of engaging notched portions. In addition, the engaging notched portions are formed in an elongated hold shape, and thus the first rotor member is allowed to move in the radial direction of the intermediate elastic member.

The invention discloses a device and a method for quickly detecting rice mildewing. The device comprises a data acquisition device and a computer, wherein the data acquisition device comprises a microprocessor, a sample chamber, a gas chamber, a gas-sensitive sensor array and a first gas pump; an upper communication pipe and a lower communication pipe are arranged between the sample chamber and the gas chamber; a gas inlet is formed in the gas chamber; the gas inlet is connected with the first gas pump through a first gas inlet pipeline; a first solenoid valve is arranged on the first gas inlet pipeline; a gas outlet and a second gas pump are arranged on the upper communication pipe; a gas outlet solenoid valve is arranged on the gas outlet; the air-sensitive sensor array is arranged in the gas chamber. According to the method, rice volatilization gas is detected through the gas-sensitive sensor array, the microprocessor is used for sampling response signals generated by gas-sensitive sensors, and the computer is used for processing sampling values, calculating dynamic classification parameters delta through a nonlinear random resonance algorithm and a nonlinear self-calibration dynamic classification model so as to judge if rice is mildewed. The device and the method can be used for quickly and accurately detecting if the rice is mildewed.

The invention discloses a multicomponent surface enhanced Raman spectroscopy (SERS) detection method based on composite photonic crystal microspheres. The multicomponent SERS detection method comprises the following steps of uniformly modifying quantum dots on the surfaces of titanium dioxide photonic crystal microspheres coated with sliver nanoparticles by an avidin-biotin system to generate an encodable composite photonic crystal microsphere material; combining the quantum dots with a titanium dioxide photonic crystal microsphere substrate material coated with the silver nanoparticles, and applying a combined substance in multicomponent surface enhanced Raman spectroscopy detection; realizing multielement detection for different biomolecules by combining encoding / decoding of the quantum dots with a Raman signal. According to the multicomponent SERS detection method disclosed by the invention, by using the titanium dioxide photonic crystal microspheres coated with the sliver nanoparticles as an encoding carrier, the multicomponent SERS detection method has the advantages of large specific surface area, high biocompatibility, simplicity and quickness in operation process and the like during biological detection; a fluorescence spectrum peak of the quantum dots is combined with a SERS characteristic spectral apex, so that the multicomponent SERS detection method can be effectively applied to multielement detection of biological detection.

In the connecting structure of a first rotor member (rotor housing) of a rotary connector and a second rotor member (rotary member) of a steering angle sensor is provided. An intermediate elastic member is interposed between both rotor members and in a clamped state, connecting protrusions and of the first rotor member are engaged with a pair of engaging notched portions of the intermediate elastic member, and connecting protrusions of the second rotor member are engaged with another pair of engaging notched portions. A line connecting the pair of engaging notched portions is orthogonal to a line connecting the pair of engaging notched portions. In addition, the engaging notched portions are formed in an elongated hold shape, and thus the first rotor member is allowed to move in the radial direction of the intermediate elastic member.

A signal detection device according to an aspect of the invention includes a laminated structure of a first circuit layer (201) in which a plurality of electrodes brought into contact with a subject is formed, a second circuit layer (202) in which a plurality of amplifiers having an input portion capacitively coupled to the plurality of electrodes, respectively, is formed, and a third circuit layer (203) in which a plurality of transistors for reading outputs of the plurality of amplifiers is formed, an insulation layer which seals the second circuit layer is formed between the plurality of electrodes formed in the first circuit layer and the second circuit layer, and the plurality of electrodes and the input portions of the plurality of amplifiers are capacitively coupled to each other via the insulation layer.

The invention provides a connecting structure of rotary connector and steering angle sensor which can reduce noise. In the connecting structure of a first rotor member (rotor housing) of a rotary connector and a second rotor member (rotary member) of a steering angle sensor, a plurality of elastic pieces is formed on the inner peripheral portion of the first rotor member so as to extend downward, an engaging protrusion is provided in the inner peripheral portion of the second rotor member so as to be inserted in an engaging hole of the elastic piece, and the elastic piece is combined with the engaging protrusion in a snap-in relationship. When a stator member of the rotary connector and a fixing member of the steering angle sensor are fixedly connected to each other during assembling, a gap between both rotor member and narrows, and thus each elastic piece bends. Therefore, a tongue portion of the elastic piece is brought into an elastic contact with the elastic protrusion, and thus both rotor members are elastically urged in an axis line direction and a radial direction.

The invention discloses a vinegar flavor analysis device and a vinegar flavor analysis method. The vinegar flavor analysis device comprises a data acquisition device and a computer, wherein the data acquisition device comprises a microprocessor, a sample chamber, an air chamber, a gas-sensitive sensor array and a first air pump; an upper communicating pipe and a lower communicating pipe are arranged between the sample chamber and the gas chamber; an air inlet is formed in the air chamber; the air inlet is connected with the first air pump through a first air intake pipeline; a first electromagnetic valve and an activated carbon filter screen are arranged on the first air intake pipeline; an air outlet and a second air pump are arranged on the upper communicating pipe; a fourth electromagnetic valve is arranged at the inlet in the top of the air chamber; an air outlet electromagnetic valve is arranged at the air outlet; the gas-sensitive array is arranged in the air chamber. According to the method, the gas-sensitive sensor array is utilized to detect the volatilized gas of vinegar, the microprocessor samples the response signal generated by a gas-sensitive sensor, and the computer processes the sampling value and judges the flavors of vinegar. According to the invention, the flavors of different types of vinegar can be distinguished, so that a manufacturer can conveniently analyze and manage the flavors of vinegar.

The invention discloses a probe servo mechanism for eddy current inspection of a main bolt inspection machine of a nuclear pressure vessel, which is characterized in that the transmission mechanism comprises a linear guide rail, a constant-force leaf spring, a turnover seat, a pressure bar, a probe holder and a spring, wherein one end of the turnover seat is provided with a vertical bend and the other end thereof is provided with a support; a rectangular block is welded near the opposite side of the support; the pressure bar is of an L-shaped structure, a U-shaped fixture is respectively arranged at both ends of the pressure bar, the U-shaped fixtures are respectively connected with the support on the turnover seat and the arc-shaped probe holder and pined through cylindrical pin shafts, and the probe holder is attached to a main bolt; and the spring is fixed in the middle of the pressure bar through a dowel, and the other end of the spring is connected on the rectangular block of theturnover seat which is clamped on the linear guide rail and connected with the constant-force leaf spring fixed on the linear guide rail. The probe servo mechanism realizes the automatic inspection for the main bolt of the pressure vessel at the nuclear power station, and the automatic inspection structure is stable and does not swing and the detection signal is stable.

The invention provides a construction method for an engineering strain of Escherichia coli used for detecting the heavy metal mercury and establishment of a method for detecting mercury in a water body by using the engineering strain of Escherichia coli. The genetic engineering strain is merR:: PmerT:: cfp-linker-cfp / E.coli delta zntA, named as E.coli WMC-010 (CTMCC No. 9749), wherein mer operon originated from Serratia marcescens is knocked into the zntA position of the genome of a wild E. coli MC4100 strain to start expression of cyan fluorescent protein (CFP). The engineering strain provided by the invention can overcome the defects of a high fluorescence background value, poor independent experiment repeatability and difficulty in accurate quantification of the heavy metal mercury in a water body of a reporter strain containing reporter plasmid and can reflect bio-availability of mercury in a water body, so bases are provided for objective evaluation of the biotoxicity of the heavy metal mercury in a water body.

The invention relates to a broken line and short circuit detection circuit and method for an earphone / headset speaker. The detection circuit comprises an MCU, a measurement signal voltage division circuit and a high frequency signal amplification and protection circuit; a detection control signal output end of the MCU is connected with the high frequency signal amplification and protection circuit, and a voltage signal input end of the MCU is connected with the high frequency signal amplification and protection circuit through the measurement signal voltage division circuit; and the high frequency signal amplification and protection circuit is arranged between the earphone / headset speaker and an audio signal output circuit. The method comprises the following steps: sending a DC or AC detection control signal by the MCU, and reading a detection voltage value of the earphone / headset speaker by the measurement signal voltage division circuit; and judging whether the broken line or short circuit occurs according to a threshold. The circuit and the method of the invention are used for radio interphones, mobile phones and electronic sound playback equipment, and can timely detect the broken line / short circuit faults of the earphone / headset speaker, so as not to affect the use. The broken line and short circuit detection circuit and the method for the earphone / headset speaker provided by the invention have the advantages of being low in cost, simple in circuit, practical, reliable and so on.

The embodiment of the invention provides a 2.5 D interdigital electrode manufacturing method and an interdigital electrode. The method comprises the following steps: exposing and developing photoresist spin-coated on a seed layer on a silicon wafer with an electron beam evaporation Cr / Au seed layer to form a required electrode pattern, then carrying out pulse electroplating in a gold electroplating solution, and controlling the electrode thickness by adjusting the electroplating time according to requirements. The method aims to increase the electrode thickness, further fix an object to be detected between electrodes, enable an electric field to completely cover the object to be detected, enable a test electric field between the electrodes to change from an arc electric field formed by anedge effect into a parallel electric field, enable a detection signal to be more stable, and finally improve the detection limit of the detection electrode. And on the other hand, as the thickness ofthe electrode is increased, the side wall of the electrode can serve as a microfluidic channel to be combined with a microfluidic system to complete detection automation.

The invention discloses a laser ultrasonic three-dimensional localization and quantitative detection method for multiple defects in a material. Under two-dimensional scanning conditions, the internaldefects are subjected to localization detection at crossing points of three propagation direction paths by using an excited oblique transmission ultrasonic bulk wave, a bottom incident ultrasonic transverse wave and a bottom reflected transverse wave, and the internal defects are quantitatively detected using the oblique transmission ultrasound body wave attenuation or wave-front delay. The amplitude of the oblique transmission ultrasonic body wave and the bottom reflected transverse wave after defect attenuation and transmission is much larger than the amplitude of the reflected or diffractedwave of the defects, which overcomes the problems of weak ultrasonic signals and low signal-to-noise ratio when detecting sub-millimeter micro defects. The oblique transmission ultrasonic body waves,bottom incident ultrasonic transverse waves and bottom reflected transverse waves respectively interact with the defects from three directions, the internal defects can be accurately located based onthe three ultrasonic intersections of the attenuation position, and accurate quantitative detection of multiple defects can be realized, which is suitable for sub-millimeter-level multi-defect localization and quantitative detection of detection materials.

The invention relates to a method of ultrafast detection of antibiotic substances by combined voltage driven solid phase microextraction-raman spectroscopy. The method comprises the following steps: taking a nano golden particle wrapped porous silver wire as a working electrode, a saturated calomel electrode as a reference electrode and a platinum electrode as a counter electrode to form an electrode system, putting the electrode system in a water sample to be detected, applying -0.05 to -0.2V voltage to the electrodes, quickly enriching the antibiotic substances in the water sample onto the working electrode due to voltage driving to achieve in-situ solid phase microextraction, and performing exciting irradiation on the surface of the working electrode through a raman spectrometer for raman spectroscopy. The method increases a diffusion rate of the substances to be detected in the water sample; the nano golden particle wrapped porous silver wire is specific to the antibiotic substances, so that the antibiotic substances are enriched onto the working electrode directionally selectively; the enrichment detection speed is greatly increased; and actual applications in quick field detection and water sample pollutant surveillance are achieved.

An automatic film-wrapping packaging machine with a cursor fixing device comprises an automatic film-wrapping packaging machine body. A strengthening piece is installed at a thin-film rotating shaft of the automatic film-wrapping packaging machine body. The strengthening piece is a piece of angle iron and is fixed to a beam frame of the automatic film-wrapping packaging machine body through fastening nuts. According to the automatic film-wrapping packaging machine with the cursor fixing device, the strengthening angle iron piece is arranged at a beam and the thin-film rotating shaft, and vibration of the automatic film-wrapping packaging machine body is reduced, so that a cursor detection signal is stable, and the quality of a product obtained by film-wrapping packaging is greatly improved.

The invention discloses a crude oil conveying pipeline inside corrosion detection device and a method thereof. A mileage counting wheel is attached onto the inner wall of a pipeline; a circuit controland data storage device is provided with a speed controller; pressure difference generated on the surface of a driving rubber cup through a liquid forms a driving force, so that the detection devicecan be made to move forward in the pipeline; a driving area and the number of installations can be changed, so that the driving force can be stabilized, and the moving speed of the detection device can be controlled; the circuit control and data storage device is connected with a data analysis unit; and corrosion conditions inside the pipeline can be analyzed through detection electromagnetic signals stored in the circuit control and data storage device. The crude oil conveying pipeline inside corrosion detection device and the method thereof of the invention have the advantages of suitabilityfor the detection of small-diameter pipelines, stable detection signals, easiness in corrosion defect quantification, and high applicability for pipelines with many elbows.

The invention discloses a device and a method for analyzing the flavour of blended vinegar. The device comprises a data acquisition device and a computer, wherein the data acquisition device comprises a microprocessor, a sample chamber, a gas chamber, a gas sensitive sensor array and a first gas pump; an upper communication pipe and a lower communication pipe are arranged between the sample chamber and the gas chamber; a gas inlet is formed in the gas chamber and connected with the first gas pump via a first gas inlet pipeline; a gas outlet and a second gas pump are arranged on the upper communication pipe; a fourth electromagnetic valve is arranged at a top inlet of the gas chamber; a gas outlet electromagnetic valve is arranged at the gas outlet; and the gas sensitive sensor array is arranged in the gas chamber. According to the method, volatilization gas of the blended vinegar is detected via the gas sensitive sensor array, response signals generated by the gas sensitive sensor are sampled by the microprocessor, and the computer processes a sampling value and judges the flavour of the blended vinegar. The device and the method can differentiate the flavours of different kinds of blended vinegar, so as to bring convenience for manufactures to analyze and manage the flavour of the blended vinegar.

An optical device unit includes: an optical device that has an electrical conductor and that is capable of enhancing Raman scattering light generated by receiving light from a light source; and a guide unit that guides a gaseous sample to the optical device. The guide unit has a first fluid path for rotating the gaseous sample in an area facing the optical device.

The invention provides a fixing device for a micro-drop detection chip. The fixing device comprises a rigid bottom plate and a rigid flip cover, and the rear ends of the rigid bottom plate and the rigid flip cover are connected through a rotating shaft to form a rotating pair; the bottom plate is used for accommodating the micro-drop detection chip, and the bottom plate and the flip cover are matched to realize rigid clamping of the micro-drop detection chip; when the micro-drop detection chip is detected, a connecting pipe comprising at least two detection pipes is placed, a groove for accommodating the micro-drop detection chip is arranged on the bottom plate, and an elastic device is arranged at the bottom of each groove for eliminating bottom tolerance for accommodating the micro-dropdetection chip. The elastic device is additionally arranged at the bottom of each pipe of the connecting pipe, so that the overall tolerance between the connecting pipe and the chip plane can be compensated, the sealing force is more uniform, the sealing effect is more uniform, the flow of liquid in all flow channels of the chip is more uniform, and the detection result of the whole instrument ismore stable.

The invention provides a construction method of an Escherichia coli engineering strain for detecting heavy metal lead and a method for detecting lead in a water body. The gene engineering strain provided by the invention is PpbrA-pbrR-PpbrA:DsRed-express2 / E.colideltazntRdeltazntA named as E.coli WMC-008p CGMCC No.9748, wherein zntA and zntR genes are subjected to deletion mutation and inactivation, and a pbr operon from a cupriavidus metallidurans CH34 strain is input to express a red fluorescence protein DsRed-express2. Compared with an Escherichia coli reporter strain containing a reporter plasmid, the engineering strain provided by the invention has the advantages of simplicity and convenience in operation, low fluorescence background value, stable signal and the like. The engineering strain provided by the invention can reflect the bioavailability of lead in the water body and can provide the basis for objectively evaluating the biotoxicity effect of lead in the water body.

The present invention comprises a first MOS transistor whose gate and drain are connected with a first node, a second MOS transistor whose gate and drain are connected with the first node and a third node, respectively, a first resistive element which is connected between the first node and a second node, a second resistive element which is connected between the second node and a ground voltage terminal, a first NOT circuit whose input terminal is connected with the second node, whose output terminal is a fourth node, and which is connected between the third node and the ground voltage terminal, and a second NOT circuit whose input terminal is connected with the fourth node and whose output terminal is a fifth node. Consequently, the present invention can detect voltage in a stable condition with low power consumption.

A storage device of a control system stores a trained neural network that is trained by using training data to which information as to whether there is an abnormality in an air flow meter is given as a true label. The trained neural network receives, as inputs, condition index values including the opening of a throttle valve and the engine speed, a load detected value calculated based on a detection signal of the air flow meter, a load estimated value estimated without using the detection signal of the air flow meter, and a change index value indicating the degree of change of the engine load. A CPU of the control system executes a diagnostic process to determine whether there is an abnormality in the air flow meter, using the neural network, which receives the condition index values, load detected value, load estimated value, and change index value as the inputs.

The invention discloses a device and a method for analyzing the flavor of pig feed. The device comprises a data acquisition device and a computer, wherein the data acquisition device comprises a microprocessor, a sample chamber, an air chamber, a gas sensor array and a first air pump; an upper communicating pipe and a lower communicating pipe are arranged between the sample chamber and the air chamber; the air chamber is connected with the first air pump through a first air inlet pipeline; a first solenoid valve and an activated carbon filter screen are arranged on the first air inlet pipeline; an air outlet and a second air pump are arranged on the upper communicating pipe; an air outlet solenoid valve is arranged on the air outlet; the gas sensor array is arranged in the air chamber. Volatilized gas of the pig feed is detected through the gas sensor array, the microprocessor is used for sampling a response signal generated by the gas sensor; the computer is used for processing the sampling value; the dynamic classification parameter delta is calculated through a nonlinear stochastic resonance algorithm and a nonlinear self-calibration dynamic classification model, so that the flavor of the pig feed is judged. The device and the method can distinguish flavors of different kinds of the pig feed.

The invention relates to a microbiology method for detecting metallic arsenic in water body, which more specifically relates to an Escherichia coli report bacterial strain construction method through gene engineering reconstruction, and relates to a method for establishing arsenic in water body. According to the construction of detection bacterial strain, a Red recombination system is employed for deleting wild type escherichia coli MC4100 arsenic resistance arsB gene, and then a gene integration technology is employed for displacing pars-arsR-gfpmut2 reporter gene to the araB coding gene position. The biological detection bacterial strain is named as E.coli WMC-011p, and a lowest detection scope for arsenic accords with a sewage integration discharge standard-GB8978-1996. The bacterial strain overcomes the disadvantages of high fluorescence background value, unstable detection signal and inaccurate result of the biological detection bacterial strain based on a plasmid carrier, and has the characteristics of strong specificity, high sensitivity and low cost.

The invention discloses a dry net deviation detector. The dry net deviation detector comprises a mounting seat, a base, a support arm, a slide arm, a branch arm, a detecting seat and a winding reel. The base is mounted in the mounting seat. The support arm is mounted at the center of the top of the base. A first insertion groove is formed in one side of the support arm. A gear box is mounted at the top end of the support arm. First threaded rods are mounted at the top of the base and on the periphery of the support arm. The top ends of the first threaded rods penetrate the slide arm, and driven wheels located in the gear box are mounted at the top ends of the first threaded rods. A rotating shaft is mounted at the internal center of the gear box. The dry net deviation detector has the advantages that dry net deviation interference signals generated by limited vibration sources can be effectively prevented, and accordingly, safety and production stability of dry nets are ensured; height and length adjustment of detected portions is rapidly completed, local adjustment after mounting of the detector is facilitated, re-disassembly and re-assembly are not needed, and the length of a guide line is adjusted conveniently during overall adjustment of the detector.

Disclosed in the invention is a current transformer fault self-detection apparatus, which comprises an auxiliary power supply as well as an auxiliary detection line that is in circuit connection at two ends of the auxiliary power supply. The auxiliary power supply employs floating processing; a contact making device is connected in series on the auxiliary detection line; and the auxiliary detection line is wound around a plurality of current transformers, wherein the auxiliary detection line is wound around each of the current transformers for a plurality of times. According to the invention, the auxiliary power supply utilizes the floating processing to avoid an interference source is introduced into the auxiliary power supply, so that stability of a detection signal can be ensured; the auxiliary power supply employs low-voltage detection, thereby ensuring personal safety of operation personnel; the auxiliary detection line is wound around the current transformers for a plurality of times, thereby realizing an effect of winding of a plurality of auxiliary detection lines on current transformers and thus improving a self-detection effect of the current transformers; and a current-limiting resistor is provided to ensure that currents in the auxiliary detection line are not too heavy and thus no influence on equipment is caused, thereby ensuring usage security of the equipment.

A nucleotide detector 10 includes: metal particles 12 having a size of the order of nanometers (diameter: about 6 nm) placed on a surface of a substrate 11 at high density with high precision (with spaces of about 12 nm between adjacent particles); and single-stranded DNAs (thiol DNAs) 13 having sulfur atoms at ends bonded to the gold particles 12. The thiol DNAs 13 are placed uniformly over the entire substrate 11 at high density with high precision. Therefore, once a fluorescence-labeled single-stranded DNA is hybridized with any of the thiol DNAs 13, high fluorescence intensity is stably obtained. This detector is therefore usable as a high-performance DNA sensor with a high SN ratio.

The present invention comprises a first MOS transistor whose gate and drain are connected with a first node, a second MOS transistor whose gate and drain are connected with the first node and a third node, respectively, a first resistive element which is connected between the first node and a second node, a second resistive element which is connected between the second node and a ground voltage terminal, a first NOT circuit whose input terminal is connected with the second node, whose output terminal is a fourth node, and which is connected between the third node and the ground voltage terminal, and a second NOT circuit whose input terminal is connected with the fourth node and whose output terminal is a fifth node. Consequently, the present invention can detect voltage in a stable condition with low power consumption.