104results about How to "Long measurement time" patented technology

The invention relates to a BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and a calibrating method thereof. The calibrating method comprises the following steps of: acquiring an electric signal of local reference light from a heterodyne photoreceiver on a basis of a traditional BOTDR for heterodyne coherent detection; transmitting the electric signal subjected to analog-to-digital conversion in a computer to be used as the optical power calibrating feedback quantity of the reference light; sending out an instruction by the computer to adjust the output power of a microwave source and change the optical power of the local reference light so that the difference between the optical power of the local reference light and the preset reference light power is smaller than a set value; calibrating the power; and detecting a BOTD signal. In the invention, the BOTDR in a working process can not be influenced by the working environment temperature, a microwave transmission line connecting the microwave source with an electro-optic modulator and different power responses of the electro-optic modulator on microwave signals of different frequencies, the error between the reference light power at different frequency points and the preset power is smaller than a set value, and the accurate measurement of the stress and the temperature is ensured.

In a distance measurement device of the invention, a light divider separates pulsed light emitted from an ultrashort pulse fiber laser into reference light A and signal light. A scanning mirror unit irradiates an object with the signal light as a division of the pulsed light and receives scattered light B, which is reflected from the object irradiated with the signal light. An optical path length adjustment unit adjusts an optical path length of the reference light A as a division of the pulsed light. A differential detector included in an interference signal generator detects the degree of interference of the reference light A having the adjusted optical path length with the scattered light B and outputs the detected degree of interference as an interference signal. A computer specifies an adjustment value set in the optical path length adjustment unit to attain a specific optical path length maximizing the interference signal and uses the specified adjustment value to compute a distance from a reference position of the scanning mirror unit to the object. The distance measurement device of the invention thus enables high-speed and highly-accurate measurement of the object.

Provided is a method capable of automatically adjusting a rotation radius and measuring an inner diameter and an outer diameter of a pipe end of a steel pipe. The method is a measuring method which aims at a measuring device for the inner diameter and the outer diameter of the pipe end, wherein laser ranging probes rotate around the pipe end. According to the measuring method, by using the mode that the rotation radius is automatically adjusted during the rotation measuring process, the defect that a laser triangulation method ranging probe is limited in the measuring range is compensated, the requirement for the aligning precision between a rotating central axis and a steel pipe central axis of a rotating platform is greatly lowered, a dynamic range capable of measuring changes on a pipe diameter is enlarged, the equipment cost of an auxiliary machine is lowered, and the stability and the practicality of equipment are improved. Meanwhile, during the operation, aiming at steel pipes with different sizes, the positions of probe fixed arms do not need to be adjusted in advance, the operation procedure is reduced, and the maintenance cost is lowered.

An endoscope-like image taking method of the present invention includes a preparation step of providing at least one peculiar index, which can be discriminated from other portions on an MR image, at the tip of a catheter, a first step (S1) of previously inserting a metal guide wire for guiding the catheter into a body cavity of a patient into which the catheter is inserted, a second step (S2) of inserting the catheter into the body cavity along the guide wire, a third step (S3) of executing an MR imaging sequence of a plurality of sliced images intersecting the guide wire, a fourth step (S4) of reconstructing three-dimensional image data based upon the nuclear magnetic resonance signals, which are generated from the patient when the sequence is executed and are received by the guide wire, and determining the tip position and the inserting direction of the catheter by detecting the peculiar index provided at the tip of the catheter based upon the three-dimensional image data, and a fifth step (S5) of reconstructing the center projected image using the three-dimensional image data and setting the tip position and the inserting direction of the catheter as a view point and a line-of-sight direction and displaying the center projected image on a display means, thereby an endoscope-like image, which is observed from the catheter in the body cavity of the patient, is taken and displayed in real time or semi-real time so that the insertion of the catheter is supported.

An intracorporeal substance measuring assembly to be provided in an embedded-type substance sensor for detecting and measuring an intercorporeal analyte includes: a detection layer containing at least one fluorescent indicator for generating fluorescence according to the concentration of the analyte; and an optical separation layer which is provided on the detection layer, is optically opaque, permits the analyte to penetrate therethrough, and prevents the penetration therethrough of at least one of living body substances possibly deteriorating the detection layer and/or obstructing the fluorescence.

The invention discloses a device for measuring straightness/coaxiality by applying laser, comprising a first Wollaston prism, a second Wollaston prism and a transitional reflector which are arranged on the measuring light path in sequence, wherein the second Wollaston prism and the first Wollaston prism are positioned on the path of the light which returns after being reflected by the transitional reflector in sequence; the transitional reflector is of plane mirror structure with light path drift adaptation functions in the two mutually vertical directions; and when the incident light enters along the characteristic direction of the transitional reflector, the light which returns after being reflected by the transitional reflector is opposite and parallel to the incident light, and the distance between the light which returns and the incident light is constant. The device ensures the datum to be invariant during measuring the straightness in the horizontal and vertical directions, thus greatly simplifying the adjustment process, shortening the adjustment time and improving the adjustment efficiency.

The car-mounted electronic control device is constructed to include a main control circuit unit to be powered with a car-mounted battery through a switching element and a main power source circuit, and a starting timer circuit unit powered at all times through an auxiliary power source circuit. The timer circuit unit is provided with a sub CPU for acting in synchronism with a high-speed clock signal, and a timing counter for counting the frequency-divided signal of a low-speed clock signal. When a power source switch is opened to interrupt a switching element, the timer circuit unit measures a target awakening time periodically by contrasting the period of the low-speed clock signal to the period of the high-speed clock signal.

The invention relates to a method and a device for identifying a radionuclide Sr-89 and analyzing a nuclear purity. The method comprises the following steps of: (1), calibrating the activity of a sample and measuring the gamma radioactive source detection efficiency of a NaI gamma energy spectrometer; (3), calculating to obtain the emissivity of a gamma ray; (4), acquiring that the energy of the gamma ray is 909 Kev by the position of a gamma peak, obtaining that an energy specific value is approximately equal to 0.01% by the emissivity of the gamma ray and the activity of the sample, and determining that a nuclide is the Sr-89; and calculating to acquire the purity. The device comprises a lead chamber, a NaI crystal and photomultiplier, a lead tank, a plastic container, a penicillin bottle and a plastic cup. By using the method and the device, the strontium-89 nuclide and the nuclear purity are quickly and highly sensitively identified; by using the method and the device, the difficulty of a technical requirement on an operator is low; compared with the utilization of scintillating liquid, the amount of a radioactive waste can be reduced to improve the environment; meanwhile, the investment through which an enterprise needs to establish new equipment and an instrument is reduced; and the method and the device have a favorable application prospect.

The invention discloses a real-time vertical wheel impact force measurement method based on tire pressure monitoring. Integrated equipment with a tire pressure derotation preprocessing module, a tire pressure-wheel force system identifying module, a calibrating and correcting method module and a tire pressure-wheel force measuring module is mainly included. Real-time tire pressure data is collected through the integrated equipment, corresponding vertical wheel impact force is obtained through the derotation preprocessing module and the tire pressure-wheel force system identifying module, and correction can be conduced according to a calibrating method. Accordingly, a wheel force measurement solving scheme which is efficient, accurate and high in adaptability is provided from the theory layer and the equipment layer, the quick assessment requirement on vast bridge health condition is met, and meanwhile the method has the great potential in the fields of road safety diagnosis, vehicle performance design and the like.

A color measuring apparatus includes an image taking section; a signal generating section selecting a teach image in which a plurality of measurement regions are set or a measurement image for color measurement and making a display device display the selected image; a camera control section controlling the image taking section to make the image taking section take an image of the image displayed on the display device; a measurement region recognizing section recognizing the measurement regions by performing image processing on the teach image whose image was taken by the image taking section; and a color measuring section measuring the color of each of measured regions corresponding to the measurement regions recognized by the measurement region recognizing section, the measured regions in the measurement image whose image was taken by the image taking section.

A sensor vehicle of the present invention has one or more rotatable track means (parallel if two or more) spaced apart by a support frame and adapted to be towed or otherwise moved in a forward direction parallel to a forward axis of said track means. Rotatable track means have two or more supporting wheels aligned on a vertical plane along the forward axis, which axis is generally parallel to a ground surface upon which said sensor vehicle travels. Tracked vehicles are well known in the art of ground and earth moving equipment having flexible, elastomer-based tracks or segmented metal tracks with associated support frames and wheels, most of which may be adapted to achieve the objects of the invention.

An electronic part transport device includes a transport medium having a plurality of lines of cavities. The lines are concentric with respect to the rotation axis. A driving device rotationally drives the transport medium. A supply device separately supplies a plurality of randomly introduced electronic parts one by one. A delivery device feeds the electronic parts separately supplied by the supply device into the cavities of the transport medium. A removal device takes the electronic parts out of the cavities of the transport medium.

An apparatus measures individual measurement sites on a DNA chip in a short period of time. The DNA chip is irradiated by light-emitting diodes (LEDs) so as to excite fluorescent dye at each measurement site, and fluorescence emitted from the individual measurement sites is detected all at once. Since substantially uniform measurement conditions can be obtained for each measurement site, measurement accuracy increases. The read mechanism requires less space and is less costly, thereby decreasing the failure rate and virtually eliminating the need for maintenance of the apparatus.

A fine timing measurement FTM method and a communications device are disclosed. The method includes: receiving an FTM request frame from at least two communications devices; and sending a first FTM measurement frame according to the FTM request frame, where the first FTM measurement frame includes a measurement parameter of each of the at least two communications devices and identifier information used to indicate each communications device, so that each communications device obtains the measurement parameter according to the identifier information.

The object of the present invention is to provide a lipid membrane whose permeability to substances is high and strongly correlated with the permeability of biomembranes to drugs and which therefore is suitable for rapid measurement. The present invention provides a membrane comprising an unsaturated C₇-C₉ hydrocarbon and a lipid.

The invention discloses a wave and sea level measuring method for deep sea and high sea based on a satellite-based differential enhanced technology. By taking a Beidou system as a primary platform which is matched with a GPS (Global Positioning System), a fused localization method is formed by adopting the satellite-based differential enhanced technology, so that wave and sea level measuring work of deep sea and high sea in a global range is realized. The method comprises the following technical steps of: receiving a satellite positioning signal and a satellite-based differential signal; calculating three-dimensional position data of a satellite float; separating wave data and sea level data; calculating the wave data; calculating the sea level data; and transmitting the wave data and sea level data to a shore station data receiving system. By mounting a Beidou/GPS satellite positioning receiving card board and a satellite-based differential signal receiving module, waves and sea levels in the deep sea and high sea in the global range can be measured. The method has the characteristics of being high in measuring precision, far in working distance, wide in coverage, long in cruising duration and the like.

A biological optical measuring apparatus includes a light source probe and a light receiving probe, one of which is provided with a pressure sensor to detect a contact pressure of a skin of a subject. Pairs of plural values of the contact pressure and light detection signals are previously recorded as calibration data, an estimated value of a false signal is derived from a detection value of the pressure sensor at primary measurement and the calibration data, and a measurement signal waveform in which a noise component due to a movement of the subject is removed is acquired by subtracting the estimated value from a light measurement signal.

[PROBLEMS] To use in a carbon dioxide separation part a gas-permeable membrane capable of maintaining high-speed determination and to diminish the influence of interfering ingredients.

[MEANS FOR SOLVING PROBLEMS] An apparatus which comprises: an organic-substance oxidation part in which organic substances contained in a sample water supplied are oxidized into carbon dioxide; a carbon dioxide separation part in which the carbon dioxide contained in the sample water treated with the organic-substance oxidation part is caused to permeate and come into a measurement water; and a conductivity measurement part in which the conductivity of the measurement water sent from the carbon dioxide separation part is measured. The carbon dioxide separation part comprises: a sample water channel in which the sample water treated with the organic-substance oxidation part flows; an intermediate water part in which an intermediate water having a higher pH value in a neutral region than the sample water flowing through the sample water channel is present; and a measurement water channel through which the measurement water comprising deionized water flows. The sample water channel is in contact with the intermediate water part through a gas-permeable membrane, and the intermediate water part is in contact with the measurement water channel through a gas-permeable membrane.

In order to be able to carry out monitoring of the electrical energy quality of an electrical energy supply system using an electrical power quality field device with comparatively little complexity, a method for monitoring the electrical energy quality of an electrical energy supply system is proposed in which the following steps are carried out: - detection of a first measured value of a first power quality characteristic by means of a measuring device (11) of a power quality field device (10, 50) arranged at a measurement point of the electrical energy supply system at a first measurement time; - detection of a second measured value of the first power quality characteristic by means of the measuring device (11) at a second measurement time, which directly follows the first measurement time; - comparison of the first and the second measured value with at least one predetermined threshold value, and - generation of an event signal, which indicates an infringement of the at least one threshold value, precisely when one of the two measured values is above and one of the two measured values is below the at least one threshold value. The invention also relates to a power quality field device in which such a method is carried out as well as to a power quality system.