35results about "Provision for operation by null methods" patented technology

The invention relates to a zero adjustment device for rotary encoders and an application method thereof. The device comprises an encoder acquisition card, a computer, an electronic hand wheel, a stepping motor driver, a stepping motor, a cylindrical worm, a helical gear and a universal magnetic gauge stand assembly, wherein the encoder acquisition card is used for connecting the signal output end of a rotary encoder of an automatic control mechanism, the computer is connected with the encoder acquisition card, the stepping motor driver is connected with output signals of the electronic hand wheel, and the stepping motor is connected with the stepper motor driver. In the process of operating, through rotating the electronic hand wheel, the stepping motor rotates and drives the helical gear to rotate through driving the cylindrical worm so as to drive a hollow rotating shaft, and meanwhile, the computer reads the output of the rotary encoder through the encoder acquisition card and displays whether the rotary encoder reaches a zero position; and when the rotary encoder reaches the zero position, a user stops rotating the electronic hand wheel, and the stepping motor stops rotating.

The invention discloses an optical fiber parameter measuring device for correcting a nonlinear tuning effect. The device is characterized in that firstly, an acoustic optical modulator (AOM) is connected into an auxiliary interferometer of an OFDR and is used for carrying out frequency shift on light waves and increasing the frequency of a beat frequency signal; then the beat frequency signal is converted into an electric signal by a balance detector, the electric signal is divided into two circuits by an electric coupler, one signal is acquired by a data acquisition card with a high sampling rate, and the other signal is used as an external clock for signal acquisition of a main interferometer; and finally, the signal of the main interferometer is corrected through the simple data processing and by taking the signal zero crossing point of the auxiliary interferometer as a reference. According to the device, the high-precision measurement data can be obtained with lower cost, the redundant data volume is reduced, and the correction accuracy of nonlinear frequency sweeping of a laser in the OFDR and the operation speed of data processing can be improved at the same time.

The invention provides a method for zero setting of an incremental encoder IC, is used for solving problems of complex zero setting program and low efficiency in the prior art, and is composed of an input control module, a one-key zero setting multiplexing input control module, a one-key zero setting mode selection module, an encoder zero operation logic module, a programmable logic module, an incremental signal generation module, an output driving module and a zero setting PCB. Through application of the method, as long as a user installs the motor correctly, the interior of the encoder enters a one-key zero setting mode through an external zero setting control panel, an enabled one-key zero setting control input end or a multiplexed incremental output signal, zero setting information iscompared with an actual Z-phase zero position, logic operation is carried out, and the zero adjustment information is written into a programmable logic device, so automatic zero setting is realized.

The generation and monitoring of a load-independent output current for a level meter, pressure gauge, flowmeter or evaluation device are described. A current that is equal or unequal to the measuring current, but inverted relative thereto, can be generated continuously or within certain time intervals in a switching circuit that is realized independently of the network generating the measuring current. The generated current can be fed into the measuring circuit at a comparison point and added. The compensation principle makes it possible to determine whether the measuring current corresponds to the nominal value, wherein a testing current is fed into the first electric circuit by means of a second switching circuit that contains a second current source. A certain expectancy value of a voltage to be tapped can be calculated in dependence on the testing current being fed in and the nominal value. If the measured voltage deviates from the expectancy value, a deviation of the measuring current from the nominal value is detected and can be output for a user.

The invention relates to a method for enabling an automobile meter needle to point zero through inertia. The method aims to solve the problem that in an existing mode for enabling an automobile meter needle to return to the original point, a hardware circuit is added. The method comprises the following steps of (1) electrifying a stepping motor driving the automobile meter needle and setting the number n of reverse pulse signals in a register to be 0, (2) exerting a reverse pulse signal to the stepping motor through a stepping motor driver to enable the automobile meter needle to move a step towards the original point of the automobile meter needle and enabling n to be 1, (3) judging if the number n of the reverse pulse signals exerted to the stepping motor by the stepping motor driver is equal to N through a single chip microcomputer, and (4) executing the step (2) if the result of the step (3) is 'no', and ending the steps if the result of the step (3) is 'yes'.

The invention discloses an attached switch in an automobile instrument stepper motor, which detects zero returning of an instrument indicator. The attached switch comprises a thin metal sheet, a thick metal sheet, a metal stopper and a wing spring, wherein a terminal pin is welded on the thin metal sheet; another terminal pin is welded on the thick metal sheet and extends to the outside of a shell; and the metal stopper is tightly pressed on an output shaft with an indicator. After assembly, the output shaft passes through a central hole of the wing spring, the metal stopper is pressed on the wing spring; one side of the wing spring is pressed on the thin metal sheet, so that the two terminal pins which are welded with the thick and thin metal sheets become two ends of a switch, one end of the switch is fixedly connected with the metal stopper, and a point A of the thick metal sheet and a point B of the metal stopper are contacts of the switch. When the output shaft rotates to a certain position towards a zero returning direction, the point A of the thick metal sheet and the point B of the metal stopper contact to show that the switch is closed; and when the output shaft rotates, the point A of the thick metal sheet is separated from the point B of the metal stopper to show that the switch is separated and indicate that the indicator departs from a zero position. Thus, the aim of detecting the zero returning of the instrument indicator is fulfilled.

The invention relates to an electrostatic monitor repeating platform sensor zero position adjustment method. The method includes following steps of: (1) preparations for the zero position adjustment of angle sensors and position sensors; (2) the zero position adjustment of the right angle sensor and stern angle sensor; and (3) the zero position adjustment of the stern position sensor and the leftposition sensor. The electrostatic monitor repeating platform sensor zero position adjustment method of the invention has the advantages of ingenious design idea and innovativeness. With the electrostatic monitor repeating platform sensor zero position adjustment method adopted, the accuracy of precision assembly can be ensured, the high precision requirements of an electrostatic repeating platform can be satisfied, working efficiency is improved, and the quality of products is ensured. The method is worthy of being popularized.