37results about How to "Eliminate the effects of testing" patented technology

The invention discloses a dangling type micro-impulse testing device and method. A dangling system is fixed in a vacuum box, a thruster ignition power source, a circuit switch, a wire and a miniature thruster are integrated to the dangling system in a modularization mode, a dangling type micro-impulse testing system works in a vacuum environment, a remote control switch serves as a circuit switch to conduct remote control ignition, and influences of a miniature thruster ignition resistance wire power source and the wire on testing results are eliminated. A laser Doppler measurer is installed outside the vacuum box, a light path of a single beam laser head in the laser Doppler measurer is adjusted to be centered with a target reflector, the deviation of outgoing beams and incident beams is eliminated, displacement changes of the thruster are accurately measured, and influences of air friction during dangling are avoided. By means of the dangling type micro-impulse testing device and method, the working force of a miniature rocket motor in a short time can be tested, the micro impulses can be tested, and the impulse testing accuracy is high.

The invention relates to an on-line monitoring control method of an electric car power cell high voltage loop resistor and an apparatus thereof. The method comprises the following steps: (1) wire connection; (2) measurement and calculation of voltage of each electrical core and total voltage of a power cell system; (3) on-line monitoring of an electric car power cell system high voltage loop coupling assembly resistor; (4) abnormity control of a power cell system high voltage loop coupling assembly. In the invention, a mode of carrying out double wire system wiring on the power cell system is employed, influence of connection board voltage drop on electrical core voltage is eliminated, and measured data is more accurate. In the condition of not increasing any complex circuit elements, through calculation and derivation, on-line monitoring and abnormity control of the power cell system high voltage loop coupling assembly resistor are realized. Cost is saved, internal space of the power cell system is saved, the method is convenient and fast, and accuracy is high.

The invention belongs to a laser application technology, and relates to a photoelectric receiver temperature coefficient test method based on acousto-optical amplitude modulation. The method includes using a single-frequency laser as a light source, outputting an amplitude-adjustable double-frequency laser after the single-frequency laser passes an acousto-optical modulator, utilizing a non-polarized beam splitting prism for beam splitting, and testing phase difference between a to-be-tested photoelectric receiver and a reference photoelectric receiver at different temperatures to obtain temperature coefficient of the to-be-tested photoelectric receiver. Phases of a reference light beam and a measurement light beam are unaffected by external environment changes in testing, extra phase errors are not introduced, test accuracy is high, and the temperature coefficient of photoelectric receivers in different light intensities can be tested by means of adjusting light intensity of the double-frequency laser.

The invention belongs to a laser application technology, and relates to a photoelectric receiver time stability test method based on acousto-optical amplitude modulation. The method includes using a single-frequency laser as a light source, outputting an amplitude-adjustable double-frequency laser after the single-frequency laser passes an acousto-optical modulator, utilizing a non-polarized beam splitting prism for beam splitting, and testing phase difference between a to-be-tested photoelectric receiver and a reference photoelectric receiver. The method has the advantages that in testing, linearly polarized light with the frequencies of v1 and v2 in a reference light beam is transmitted in a coaxial identical-optical-path mode, and linearly polarized light with the frequencies of v1 and v2 in a measurement light beam is transmitted in a coaxial identical-optical-path mode; phases of the two light beams are unaffected by external environmental changes, extra phase errors are not introduced, and test accuracy is high; time stability of photoelectric receivers in different light intensities can be tested by means of adjusting light intensity of the double-frequency laser.

The invention is a method for rapidly evaluating the lifetime of an atomic gas chamber. The method first regulates the distribution state of the alkali metal in the atomic gas chamber to achieve a stable and concentrated regional distribution, and uses a glass shell packaged standard sample pair equal to the sample of the atomic gas chamber to be tested. The differential scanning calorimeter is calibrated to ensure accurate measurement of the amount of alkali metal in the gas chamber, and then the gas chamber is accelerated at high temperature T, and the amount of alkali metal in the gas chamber is periodically monitored at intervals of time t1. When the amount of alkali metal decreases linearly, accelerate the aging of the gas chamber at three different temperatures T0, T1, and T2 to obtain the consumption rate of alkali metal at these temperatures, and finally extrapolate from the Arrhenius equation to obtain the gas chamber at the operating temperature. The consumption rate of the alkali metal in the chamber can be used to quickly estimate the lifetime of the atomic gas chamber based on the initial amount of alkali metal. Compared with the traditional method of tracking and testing the amount of alkali metal for several years, this method not only accurately measures the consumption rate of alkali metal but also can complete the evaluation of the lifetime of the atomic gas chamber in a short period of time.

The invention belongs to a laser application technology, and relates to a photoelectric receiver time stability test method based on double-acousto-optical frequency shift. The method includes using a single-frequency laser as a light source, outputting a double-frequency laser after the single-frequency laser passes a double-acousto-optical frequency shifter, utilizing a non-polarized beam splitting prism for beam splitting, and testing phase difference between a to-be-tested photoelectric receiver and a reference photoelectric receiver. The method has the advantages that in testing, linearly polarized light with the frequencies of v1 and v2 in a reference light beam is transmitted in a coaxial identical-optical-path mode, and linearly polarized light with the frequencies of v1 and v2 in a measurement light beam is transmitted in a coaxial identical-optical-path mode; phases of the two light beams are unaffected by external environmental changes, extra phase errors are not introduced, and test accuracy is high; test frequency can be changed by the aid of the double-acousto-optical frequency shifter, and time stability of photoelectric receivers is tested when different beat frequencies interfere the frequency.

The invention belongs to the field of laser technologies, and more particularly relates to a reflector angle drift stability testing system and a reflector angle drift stability testing method. According to the reflector angle drift stability testing system and the reflector angle drift stability testing method, light beam pointing stability is converted into variation of object-image relative positions by adopting an imaging design, and the influence of a light source and a diagnostic system on tests is eliminated; and by adopting an optical design, two feature objects associated with reflector stability are placed on the same plane for solid connection, thereby eliminating influence on the independent stability of the feature objects. The reflector angle drift stability testing system and the reflector angle drift stability testing method are suitable for stability tests of various kinds of optical elements in large-sized laser devices.

The invention provides a method for testing a fiber-optic gyroscope resolution ratio. According to the method, firstly a speed rotary table is adjusted, then a fiber-optic gyroscope is mounted, and finally the fiber-optic gyroscope is tested. On the basis of a conventional speed rotary table, through the improvement of a test method, the influence of an earth rotation horizontal component on test of the fiber-optic gyroscope resolution ratio is effectively eliminated, so that a low-accuracy rotary table can precisely measure the resolution ratio of the high-accuracy fiber-optic gyroscope.

The invention belongs to a laser application technology, and relates to a photoelectric receiver temperature coefficient test method based on non-polarized beam splitting of a dual-frequency laser. The method includes using the dual-frequency laser as a light source, utilizing a non-polarized beam splitting prism for beam splitting, and testing phase difference between a to-be-tested photoelectric receiver and a reference photoelectric receiver at difference temperatures to obtain temperature coefficient of the to-be-tested photoelectric receiver. The method has the advantages that phases of a reference light beam and a measurement light beam are unaffected by external environment changes in testing, extra phase errors are not introduced, and test accuracy is high.

The invention belongs to a laser application technology, and relates to a photoelectric receiver temperature coefficient test method based on double-acousto-optical frequency shift. The method includes using a single-frequency laser as a light source, outputting a double-frequency laser beam after the single-frequency laser passes a double-acousto-optical frequency shifter, utilizing a non-polarized beam splitting prism for beam splitting, and testing phase difference between a to-be-tested photoelectric receiver and a reference photoelectric receiver at different temperatures to obtain temperature coefficient of the to-be-tested photoelectric receiver. The method has the advantages that phases of a reference beam and a measurement beam are unaffected by external environment changes in testing, extra phase errors are not introduced, test accuracy is high, and the temperature coefficient of photoelectric receivers in different frequencies can be tested by means of adjusting light frequency of the double-frequency laser.

The invention belongs to test equipment and particularly relates to a variable frequency heat pump type rock-soil thermal property tester. The tester comprises a heat pump unit, wherein the outlet pipeline of the heat pump unit is communicated with the inlet pipeline of the heat pump unit through a buried pipe, temperature sensors, flow sensors and water supplementing buckets are arranged on the outlet pipeline and inlet pipeline of the heat pump unit, and the temperature sensors and the flow sensors are electrically connected with a central control system; the heat pump unit is electrically connected with the central control system through a frequency changer, and the heat pump unit is electrically connected with a draught fan coil system. The tester provided by the invention can be used for solving such problems in the prior art as troublesome testing method and process and loose equipment structure, and the tester has the advantages of compact structure design, simple testing process, little investment, accurate testing structure, and the like.