250 results about "Measurement reliability" patented technology

A method and apparatus for noninvasive glucose measurement measures glucose indirectly from the natural response of tissue to variations in analyte concentration. The indirect measurement method utilizes factors affected by or correlated with the concentration of glucose, such as refractive index, electrolyte distribution or tissue scattering. Measurement reliability is greatly improved by stabilizing optical properties of the tissue at the measurement site, thus blood perfusion rates at the sample site are regulated. Perfusion is monitored and stabilized by spectroscopically measuring a control parameter, such as skin temperature, that directly affects perfusion. The control parameter is maintained in a range about a set point, thus stabilizing perfusion. Skin temperature is controlled using a variety of means, including the use of active heating and cooling elements, passive devices, such as thermal wraps, and through the use of a heated coupling medium having favorable heat transfer properties.

The invention discloses a multifunctional flexible touch sensor. The flexible touch sensor is characterized in that a flexible polyimide circuit board is used as a substrate; a three-dimensional force sensing unit array and a temperature sensing unit array are respectively arranged on the substrate; three-dimensional force sensing units in the three-dimensional force sensing unit array and temperature sensing units in the temperature sensing unit array are arranged at intervals; and the surface height of each temperature sensing unit is lower than the surface height of each three-dimensional force sensing unit, thereby forming the integral concave-convex distribution form. The full-flexibility multifunctional touch sensor disclosed by the invention has the advantages of excellent surface adaptability, high three-dimensional force measurement reliability, small cross interference of mechanics and temperature information.

The invention provides a space division multiplexing Mach-Zehnder cascade fiber interferometer and a measurement method thereof. The space division multiplexing Mach-Zehnder cascade fiber interferometer is composed of a wide-spectrum light source, a photodetector, a coupler, a single-mode connection optical fiber, an optical fiber sensor, a continuous-variable optical delay device, and a reflector, wherein the optical fiber sensor is composed of a Mach-Zehnder interferometer and forms a cascade optical fiber sensor array or a network. The wide-spectrum light source and a photodetector are connected with the optical fiber sensor through the coupler to form a sensor network; and the sensor network is connected with the continuous-variable optical delay device and the reflector through the coupler and is used for enquiring and demodulating the optical fiber sensor. The space division multiplexing Mach-Zehnder cascade fiber interferometer solves the problem of breakage of the optical fiber sensor array, improves the anti-damage characteristics of the optical fiber sensor array and the network and solves the temperature compensation problem in the measurement process. The space division multiplexing Mach-Zehnder cascade fiber interferometer has the advantages of simple interferometer structure, easy implementation, improved measurement reliability and low cost, and better facilitates the technology generalization and popularization.

The invention provides an automatic flatness measuring machine which at least comprises a base, a support frame, a transmission guide system, a clamp system, a measuring system and a movement control system. The base is horizontally disposed on the ground, the support frame is vertically fixed on the base, and the transmission guide system is fixed on the base; the clamp system comprises a platform base board and an elastic clamping mechanism; the measuring system comprises a digital dial indicator, a single-chip microcomputer A and a computer, wherein the digital dial indicator is mounted on a sliding block of a Y-axis ball screw; and the movement control system comprises an upper computer, a single-chip microcomputer B, a drive, a proximity switch and a stepping motor. According to the automatic flatness measuring machine, the deflection of a detection object is detected, processed, stored and analyzed through a computer automation technology, the machine has great significance in reduction of labor costs, improvement of production efficiency and measurement reliability and the like, and the measuring machine is high in portability.

The invention discloses a coherent wind measurement laser radar system with adjustable range resolution. In one aspect, the system employs a polarization circular beam splitter 3, locks vertical polarized light in a circular device, and repeatedly passes through AOM to allow emitted laser to generate n upsilon M frequency shift, thereby adjusting laser frequency shift; in another aspect, the system employs EOM 5 to cooperate with the polarization circular beam splitter 3, converts the polarization state of the laser in the circular device reaching preset offset into parallel vibration from vertical polarization, and converts continuous wave laser into pulse width adjustable pulsed light, thereby realizing the adjustment of the range resolution of a coherent wind measurement laser radar. The scheme not only improves the applicability of the coherent wind measurement laser radar on different resolution requirement occasions and under different weather, but also improves the data measurement reliability of the coherent wind measurement laser radar.

The invention relates to the field of medium thickness detection, in particular to a thickness identification device of a slice-type medium and an identification method thereof. By means of the provided thickness identification device of the slice-type medium, the problem of low measurement reliability of the existing thickness identification device of the slice-type medium is solved. The thickness identification device of the slice-type medium comprises a thickness measurement module, a data storage module, a data correction module and an identification module, wherein, the thickness measurement module acquires the thickness measurement information of the slice-type medium; the data storage module stores standard thickness data and reference nominal data of measured data; the data correction module carries out data correction on the thickness measurement information acquired by the thickness measurement module according to the reference nominal data so as to obtain thickness detection data of the slice-type medium; and the identification module compares the thickness detection data with the standard thickness data so as to complete thickness identification of the slice-type medium. In the invention, by correcting the measurement information, measurement errors are reduced, the identification accuracy of financial service equipment is improved, and identification robustness of negotiable documents is enhanced.

The invention provides an end executor used for high-precision drilling and dimpling of a robot. The end executor comprises a spindle, a feeding unit of the spindle, a normal measuring device, a driving unit of the normal measuring device, a datum hole visual positioning unit and a guide rail installation plate. The spindle and the feeding unit of the spindle are installed on the guide rail installation plate. The normal measuring device is installed at one end of the guide rail installation plate. The datum hole visual positioning unit is installed on the back side of the guide rail installation plate. The end executor is compact in structure and comprises a plurality of function modules including a displacement detection module, a normal measuring module and a datum hole visual positioning module, and the measurement reliability is improved. The displacement detection module can detect the tool feeding amount and deformation amount of a workpiece when the workpiece is clamped and machined, and compensate for the deformation amount. The normal measuring device is small in size, multifunctional and high in measurement precision. The end executor is installed on an end flange plateof the industrial robot, and the drilling perpendicularity can be guaranteed.

There is provided an apparatus for measuring a blood sugar by using a microwave without withdrawing any blood while enhancing the reliability of measurement. The apparatus for measuring the blood sugar according to the present invention has a main body having a measurement surface configured to contact a measurement portion of a user, a probe part having a contact member exposed on the measurement surface so as to be in contact with the measurement portion, the probe part further having a probe disposed under the contact member for irradiating and receiving a microwave, a blood sugar measuring unit for supplying the microwave to the probe and measuring a blood sugar value from the received microwave, and a securing unit mounted on the main body for securing the measurement portion to the measurement surface.

The present invention is directed to a real-time automated video cognizer that functions as a facial video processor for detecting drowsiness in operators of motorized vehicles, including the use of a video cognizer to provide pattern recognition and control signal generation during monitoring of macroscopic or microscopic biological processes. More specifically, the present invention accepts input from a video monitoring system that continuously captures the operator's facial images; employing three sequential means of processing the digitized video information to extract the position and configuration of drowsy-relevant facial features and numerically processes this information to yield a quantitative estimate of drowsiness probability in each epoch of monitoring. The means of the present invention are noninvasive, do not restrict driver movement or performance, provide increased measurement reliability for actual driver behavior, and include the capability of generating or triggering suitable alarms when drowsiness occurs.

The present invention discloses a specialized device for measuring the resistance of a superconducting line joint, comprising a low temperature Dewar unit, a room temperature tube unit, a background magnet unit, an excitation magnet unit, a linkage frame unit, a weakening magnetic field measuring unit, etc. The specialized device has the advantages that only the room temperature tube is required to be moved out from the low temperature Dewar via a guide rail when a sample loop of the measured superconducting line joint is replaced, so that the volatilization amount of the liquid helium in an experimental process is reduced. The background magnet is positioned on the lateral side of a Hall element which measures the weakening magnetic field of the sample loop of the superconducting line joint. Compared with being positioned at the lower side of the Hall element, the background magnet positioned at the lateral side of the Hall element reduces the influence of the background magnet to the fact that the Hall element measures the weakening magnetic field generated by the sample loop of the superconducting joint. With the room temperature tube technical, the Hall element is arranged inside the room temperature tube, namely a normal temperature Hall sensor measures the weakening magnetic field of the sample loop of the superconducting joint. The cost of the device is reduced and the reliability of the measurement is improved.

The digital detection method of large-scale skin based on laser tracker firstly processes the MBD digital model of skin part with CATIA software, generates detection features, and sets feature measurement points to represent the measurement parameters on the extracted detection features; and then positioning and fixing the skin part on the fixing flat table; measuring the data of skin parts by using the testing system, analyzing software compares the measured data with the theoretical data, and then fits them to establish the functional relationship between the measured data and the theoretical data, and constructs the measuring coordinate system. Then through the detection system, according to the measurement planning document, complete the measurement data collection work of the detection project one by one; The data processing software fits and compares the measured data with the theoretical mathematical model to obtain the analysis results, and displays the product quality characteristics in the form of three-dimensional features and outputs the detection report, which effectively improves the measurement reliability and detection efficiency, and provides data for process optimization.

The invention discloses an ultra-low frequency high-accuracy micro-vibration measuring system which is composed of a base, four adapter blocks, four strain-type force sensors, a load disc, a dynamic strain indicator, 48 strain gages and a data collecting and processing system. The strain gages are pasted on the strain-type force sensors. The strain-type force sensors are located between the load disc and the adapter blocks and are connected between the load disc and the adapter blocks in a tightened mode through bolts. The adapter blocks are located on the side surface of the base and connected with the side surface of the base in a tightened mode through bolts. Three dynamic forces and three dynamic force moments of a disturbance source are measured through the fact that the strain gages pasted on the strain-type force sensors are reasonably combined and connected with the dynamic strain indicator to form 12 full bridge circuits. The disturbance source can be installed inside the measuring system and can also be installed outside the measuring system. The strain gages are connected with the dynamic strain indicator through wires. The dynamic strain indicator is connected with the data collecting and processing system through a wire. The ultra-low frequency high-accuracy micro-vibration measuring system can accurately measure the vibratory force and the vibratory force moment of a tiny disturbance source, the measured frequency range is accurate to 0Hz, and the measuring reliability is high.

A contactless temperature-measuring device especially for a respiration humidifier with a flow channel for breathing gas, which is improved in respect to handling and reliability of measurement. The device includes: a hollow body (1), which is closed towards the flow channel (2, 6), extends into the flow channel (2, 6) for assuming the temperature in the flow channel (2, 6); and an infrared detector (3, 7) is directed toward the inner surface of the hollow body (1) extending into the flow channel (2, 6) for the contactless detection of the temperature of the hollow body (1).

The invention belongs to the field of gas pressure measurement, and relates to a sensor temperature drift compensation method and a pressure sensor box. The pressure sensor box comprises a box body part and a circuit part, wherein the box body part consists of a pressure sensor [2] and an aviation plug [1]; and the circuit part is a compensation circuit consisting of an MAX 1452 chip and a peripheral circuit. According to the sensor temperature drift compensation method provided by the invention, calibration of temperature drift can be realized according to sensor characteristics, and the algorithm is simple and effective; and sensor full-range output temperature drift before correction of the temperature compensation method is 4 percent within a range of -40 to 125 DEG C, and the compensation accuracy can reach 0.5 percent after the compensation by the algorithm. The pressure sensor box integrates the gas pressure measurement of multiple passages, and has the advantages of simple structure, high sensitivity, excellent dynamic response characteristic, high overload resistance capacity, high measurement reliability, wide working temperature range and the like.

The invention provides an object size measurement method and system and an intelligent terminal. The object size measurement method comprises the following steps that the measurement mode of a camera is initialized; the camera photographs an object to be measured and forms an image in the measurement area on a screen; meanwhile, a reference object arranged in the same measurement plane with the object to be measured is also photographed, and an image is formed in the reference area on the screen; the first pixel value of the object to the measured is obtained according to the screen resolution of the intelligent terminal and the length of the image of the object to be measured in a measurement direction, and a second pixel value occupied by the reference object is obtained according to the screen resolution of the intelligent terminal and the length of the image of the reference object in the measurement direction; and the size of the object to be measured is calculated according to the obtained first pixel value, the second pixel value and the size of the reference object. According to the object size measurement method and system and the intelligent terminal, the size of the object can be more conveniently and rapidly measured, and measurement reliability and accuracy are high.

The invention discloses a device for improving the measurement accuracy and the measurement reliability of a single-tipping-bucket rain gauge and a use method for the same. According to the device and the method, the conventional stainless steel is replaced by a light-weight alloy material for producing a tipping bucket, and Teflon is sprayed on the surface of the water collection side of the rain gauge; a difference reduction system composed of a micro-valve, a valve opening-closing device and a bypass flow guide tube is additionally arranged; a double-reed switch composed of two single reed switches which are arranged in a staggering manner is used for replacing the conventional reed switch; the switching signal output by the reed switch is processed by adopting a mutual calibration method for the two double-reed switches; and a digital rain amount value is transmitted via a low-power-consumption ZigBee wireless mode which is convenient for networking. Via the device and the use method disclosed by the invention, the difference and the wetting loss during the measurement process are reduced, the defect that the single reed switch is easy to generate mis-operate due to the environment magnetic interference is solved, and the reliability of the rain gauge is improved; and the digital rain amount value is transmitted via the low-power-consumption ZigBee wireless mode, so that the networking is convenient.

The invention discloses a thermal imager radiation calibration accuracy analysis method. The method comprises the following steps that: (1) an infrared thermal imager radiometric calibration experiment is performed, and a radiometric calibration coefficient is determined; (2) the sources of uncertainties influencing entrance pupil radiance in a process when a standard blackbody radiation source isadopted to perform radiometric calibration, and the relative uncertainty magnitudes of influence quantities are analyzed; (3) the relative uncertainty magnitude and probability distribution form of the entrance pupil radiance are synthesized, the magnitudes of introduced uncertainty components are analyzed, and the standard deviation of the radiance is synthesized; (4) the uncertainties and probability distribution form of the radiometric coefficient are calculated, a corresponding relation between the recovered radiance and DN value of a thermal imager is obtained; (5) the uncertainty and probability distribution of the recovered radiance of the thermal imager are obtained; and (6) the actual entrance pupil radiance of the thermal infrared imager is determined. The thermal imager radiation calibration accuracy analysis method of the invention is used for evaluating the reliability of the radiance measurement of the infrared thermal imager, and can improve calibration accuracy and improve data quality.

The invention discloses a multipoint dispersive accumulative alpha energy spectrum soil radon-measuring method, which comprises the following steps: A. a measuring point is selected, and a data acquisition unit is buried into the soil of the measuring point; B. after radon gas in the soil is dispersed into a radon gas acquisition chamber of the data acquisition unit, the data acquisition unit is started; C. the data acquisition unit accumulatively collects and measures radon of the measuring point and alpha radiators in daughters of the radon, and then transmits measuring data to an on-scene data management module; D. the on-scene data management module performs statistic analysis on the measuring data, and then transmits the measuring data to a computer analysis module; and E. the computer analysis module further analyzes the data. The method can overcome the defects of the prior soil radon-measuring method, can solve the problems of low measuring efficiency, measuring precision, measuring accuracy and measuring reliability of the soil radon, and can realize qualitative measurement on the radon and daughter nuclide of the radon, thereby being capable of meeting the active demand of the prior geological exploration field and the prior environmental evaluation field on measurement of the soil radon.

The invention relates to the technical field of elevators and aims at providing an elevator guide rail perpendicularity detection method. The method includes the following steps that an image collecting device photographs guide rail images provided with a heavy hammer or a laser plummet in a hanging mode; the guide rail images collected by the image collecting device are read; the target guide rail image needing image processing in the guide rail images is cut out; the target guide rail image is processed; guide rails and a vertical line are selected, the main guide rail and the auxiliary guide rail are selected; the pixel deviation value of the selected guide rail perpendicularity is calculated based on the pixel Pythagorean theorem, the actual deviation value of the guide rail perpendicularity is calculated according to the pixel correction value and the guide rail maximum deviation value and whether the guide rails are qualified or not is judged. The elevator guide rail perpendicularity detection method has the advantages that the problem that measuring results are affected by human factors in manual measuring is solved, errors are reduced, the defects of low measuring efficiency, difficult operation, poor measuring reliability and the like are overcome, and efficient, controllable and high-precision detection is achieved. Image processing algorithms such as color model replacement, channel selection and grey level transformation are adopted, and the operation time and the image storage space are reduced.

The invention provides an aerodynamic parameter measurement method for an aircraft, which is used for measuring key data in three aspects of an airflow angle, dynamic pressure and an aerodynamic force. The method comprises the following steps: the airflow angle is calculated, the airflow angle is acquired through an embedded atmospheric data sensing system or a trajectory reconstruction mode, andthe above two modes are in mutual backup; the dynamic pressure is calculated, data are outputted according to pressure sensors configured by the embedded atmospheric data sensing system on the aircraft, the dynamic pressure is calculated and input is provided for calculating an aerodynamic coefficient; and the aerodynamic coefficient is calculated, the output is measured by using accelerometers, the aerodynamic force, that is, the lift force and the drag force, is calculated, and in combination of the dynamic pressure data, an aerodynamic calculation formula is used to directly determine the lift force coefficient and the drag force coefficient of the aircraft. The embedded atmospheric data sensing system is equipped with two sets of pressure sensors and multiple sets of accelerometers andgyroscopes. A hardware redundancy design and an algorithm redundancy design are adopted, and the aerodynamic parameter measurement reliability is improved.

The invention discloses a method for controlling the amount of coal conveyed into a furnace of a thermal generator set on the basis of virtual fuel quantity. The method includes the steps that (1) a fuel quantity instruction signal is formed through a unit load instruction and a boiler main steam pressure deviation signal, (2) virtual fuel quantity represented by capacity air door openness and coal mill inlet primary air pressure is obtained through coal mill capacity air door openness and a coal mill inlet primary air pressure signal, (3) by means of a PID arithmetic device, deviation signals of a fuel quantity instruction and a virtual fuel quantity are dynamically modified, the capacity air door openness is adjusted, and the quantity of fuel entering a hearth is adjusted. The virtual quantity of the fuel entering the hearth is obtained by means of the coal mill capacity air door openness and the coal mill inlet primary air pressure through functional operation and multiplication, the problems that a coordination system of a double-inlet double-outlet powder grinding system thermal generator set is poor in capacity air amount measurement reliability, and accordingly fluctuation of set operation parameters is large and even the coordination system can not be put into operation are solved, and stability and safety of operation of the set are improved.

A method and apparatus for noninvasive glucose measurement measures glucose indirectly from the natural response of tissue to variations in analyte concentration. The indirect measurement method utilizes factors affected by or correlated with the concentration of glucose, such as refractive index, electrolyte distribution or tissue scattering. Measurement reliability is greatly improved by stabilizing optical properties of the tissue at the measurement site, thus blood perfusion rates at the sample site are regulated. Perfusion is monitored and stabilized by spectroscopically measuring a control parameter, such as skin temperature, that directly affects perfusion. The control parameter is maintained in a range about a set point, thus stabilizing perfusion. Skin temperature is controlled using a variety of means, including the use of active heating and cooling elements, passive devices, such as thermal wraps, and through the use of a heated coupling medium having favorable heat transfer properties.

The invention discloses an online fault diagnosis method and system for a centrifugal pump. According to the method, a vibration sensor is utilized for measuring a radial vibration signal in the operating process of a pump; the radial vibration signal is transmitted to a signal processing module; analysis treatment is conducted based on the cyclostationary theory so that a cyclic autocorrelation function can be obtained and subjected to slice analysis; feature parameters for distinguishing whether the pump breaks down or not and recognizing the breakdown type after it is determined that the pump breaks down are obtained; and a relevant breakdown diagnosis result is obtained by performing comparison and analysis on the feature parameters and corresponding parameters generated when the pump runs normally under the design working condition. According to the online fault diagnosis method and system for the centrifugal pump, diagnosis on mechanical seal damage and cavitation failures can be achieved by measuring the radial vibration signal of the pump, the running feature information of the pump can be reflected in the vibration signal in real time, the information integration degree is high, the number of signal transfer paths is small, the anti-jamming capability is high, and measurement reliability is high; and by analyzing stable components in the cyclic autocorrelation function of the signal, the situation that running is unstable due to the bias condition and consequently signal analysis is disturbed can be avoided, and specific reasons which cause unstable flowing of the centrifugal pump are identified.

The invention relates to a wearable obstacle avoiding method and device based on an enhanced binocular image sensor and a 3D millimeter wave radar, which belongs to the field of wearable devices. Themethod comprises the steps that 1 the 3D millimeter wave radar and the enhanced binocular image sensor are used to collect the data of the distance, velocity and azimuth of an obstacle; 2 the information collected by the 3D millimeter wave radar and the image sensor are fused; and 3 the fused information of the distance, velocity and azimuth of the obstacle is informed to a device wearer through the information interaction method of sound encoding. The device comprises the image sensor, a radar sensor, an information fusion module and an information interaction module. According to the invention, the method fuses the information of the 3D millimeter wave radar and the enhanced binocular image sensor; the measurement reliability is improved; and the method and device can better help peoplewith vision disabilities to avoid existing obstacles.

Systems, methods, and apparatus for synchronizing timing in devices coupled to a data communication link are disclosed. In one example, a first device programs a future system time value in a second device. The first device launches a low-latency trigger signal that causes the future system time value to be loaded into a timer of the second device when a timer of the first device matches the future system time value. The second device measures phase difference between the trigger signal and edges of a clock signal used for timing in the second device. The phase difference is measured using an oversampling clock that provides a desired measurement reliability. The measured phase difference permits the first device to accurately determine system time as applied to the second device. The trigger signal can be provided on existing pins used by first and second devices in accordance with communication protocols and specifications.

The invention discloses an insulation monitoring device based on a non-balanced bridge for a direct current system and belongs to the technical field of ground insulation monitoring of buses of directcurrent systems. The device mainly solves the problem that the adaptive capability cannot be achieved in existing measurement and the measurement reliability cannot be ensured. The device is mainly characterized by comprising a first branch circuit, a second branch circuit, a main control single chip microcomputer, a signal conditioning circuit and a switch array, wherein the signal conditioningcircuit and the switch array are connected with the main control single chip microcomputer; the first branch circuit is in parallel connection with the second branch circuit, and the two ends of the first branch circuit are connected with a sixth switch and a seventh switch respectively; the junction point between a first switch and a third sensor and the junction point between a second switch anda fourth sensor are both connected with a fifth switch; a first sensor, a second sensor, the third sensor and the fourth sensor are electrically connected with the signal conditioning circuit; the signal conditioning circuit is also connected with a fifth sensor; the switch array is electrically connected with the first switch, the second switch, a third switch, a fourth switch, the fifth switch,the sixth switch and the seventh switch separately. The device is mainly applied in insulation resistance of positive and negative electrodes of direct current systems on low-voltage ground (case ground) in BMSs or high-low voltage direct current systems with similar demands.

The invention belongs to the technical field of displacement measurement and relates to an automatic three-dimensional displacement monitoring method for arch dam deformation. The method comprises the steps of dividing an arch dam into n sections, measuring a three-dimensional displacement value at the position of an end point of a first section, and monitoring the three-dimensional variation of the end point of each section, relative to the previous end point, so as to obtain the three-dimensional displacement value of the end points of all the sections according to a transfer principle. The method is simple and feasible, and convenient for engineering implementation, conforms to the practical engineering monitoring needs, provides an effective means for automatic three-dimensional displacement monitoring on the arch dam and overcomes the defect that the original measurement method only can monitor one-dimensional or two-dimensional displacement; in addition, the practical deformation condition of a dam body is combined, while the measurement effectiveness and the measurement precision are ensured, the corner parameter monitoring on a platform part of a measured part is cancelled, the measurement process is optimized, the measurement device is simplified, the measurement reliability is improved and the measurement cost is reduced.

A chip with measuring reliability and a method thereof are provided. The present invention serially connects a resistor having a resistance equal to or a little more than a maximum resistance of the chip itself to the resistor Rs of the chip so as to compensate the resistance differences among chips. A noise to signal (N / S) ratio of the chip is decreased, and a measuring reliability of the chip is improved.

A manufacturing method of measuring key size of scanning electronic microscope (CDSEM) calibration sample includes pre-cleanout of silicon underlay, forming underlay oxidizing layer, accumulating multi crystal silicon layer, forming photosensitive resist pattern, forming gate structure, forming a conducting layer. Gate structure sample gained restrains the aggradation of hydrocarbon induced by cumulation of surface charge for the abreaction effect of conducting layer, so the phenomenon of overloading of CD grown is eliminated to make service life of the calibration sample prolong apparently and guarantee the reliability of test of CDSEM.

Provided is a biological signal measuring system based on a driving environment for a vehicle seat. A biological signal measuring device is provided in a seat of a vehicle where most of the body of the driver who is driving a vehicle is consistently located to easily measure a biological signal of the driver and determine and remove noise from the biological signal which is caused by the movement of the driver due to change in a driving environment and a road condition, thereby improving reliability of measurement of a biological signal.