94results about How to "Eliminate the effects of detection" patented technology

The invention relates to a formaldehyde detecting device and method. The device comprises a first sensor, a second sensor, a temperature and humidity sensor and a controller. The method comprises thesteps that a first concentration signal C1 output by the first sensor and a second concentration signal C2 output by the second sensor are subjected to temperature compensation and / or humidity compensation according to a detecting signal output by the temperature and humidity sensor, and a formaldehyde concentration value is obtained according to the compensated first concentration signal C1t, thecompensated second concentration signal C2t and a third concentration signal C3t output by an algorithm and stored in the controller. The formaldehyde detecting device disclosed by the invention canidentify the disturbance gas under different to-be-detected environments, overcomes the technical defect of inaccurate detection data caused by the disturbance gas, and can eliminate the influence ofthe temperature and the humidity on formaldehyde detection simultaneously, and a solution scheme with excellent anti-disturbance property and high precision is provided for large-scale application ofthe formaldehyde detecting device to the fields of air purifiers, heating ventilation air conditioners and the like.

The invention provides a wavefront aberration detection device and a wavefront aberration detection method for a beam expansion and collimation system. The detection device comprises a shearing unit, an adjustment unit, a photoelectric detection unit, a storage unit and a signal processing unit; the shearing unit and the photoelectric detection unit are arranged on an optical path of an outgoing beam of the beam expansion and collimation system sequentially; the shearing unit is positioned between the beam expansion and collimation system and the photoelectric detection unit; the shearing unit comprises a one-dimensional phase grating A and a one-dimensional phase grating B and is used for shearing incident optical waves; the width of a non-light-transmitting part between two adjacent light-transmitting parts of the two one-dimensional phase gratings is p / 6; the width of the light-transmitting parts is p / 3, and p is the cycle of the one-dimensional phase grating; and the p is set to be more than or equal to 16 beta, and beta is the pixel size of the photoelectric detection unit. The device can eliminate the influence of + / -3 grade or + / 3 multiple grade of diffraction light and the energy of the formed interference beam waves is mainly concentrated in + / -1 grade of diffraction beam waves and the influence of other multiple grade of diffraction beam waves on the wavefront aberration is eliminated, so that the detection accuracy is improved.

The invention discloses a centering measurement apparatus for measuring the center distance of two intersecting holes in an intersecting hole system. The centering measurement apparatus comprises a two-hole positioning and centering device including an elastic centering expanding sleeve, a centering pull bar, a centering pressure bar, an eccentric wheel compacting mechanism and a positioning pin, a variable-pitch cam mechanism including a handle, a servo-actuated eccentric cam, a bearing positioning circular section and a cooperative column, and an auxiliary centering mechanism, wherein the two-hole positioning and centering device is inserted in a first hole system of a part to be measured, the eccentric wheel compacting mechanism is rotated to move the centering pull bar and centering pressure bar and open the elastic centering expanding sleeve to center the first hole system, and the variable-pitch cam mechanism and the auxiliary centering mechanism are inserted in two sides of a second hole system of the part to be measured. The handle is rotated to drive the cam to rotate, so that the rim of the cam is tangent to the excircle of the elastic centering expanding sleeve, and angle scales corresponding to different center distances of the first hole system and the second hole system are radially marked on the end face of the servo-actuated eccentric cam. The actual center distance of the intersecting holes of the part to be measured can be rapidly obtained by observing the angle graduation lines, and rapid and accurate measurement is realized.

The invention discloses a lock catch loss fault detection method, system and device, and belongs to the technical field of train lock catch loss fault detection. According to the invention, the problems of low detection accuracy and low detection efficiency when the lock catch loss fault is detected in a manual image checking mode are solved. The method is specifically realized through the following steps: collecting a complete image of the side part of a train, and intercepting a to-be-identified lock catch part image from the collected complete image of the side part of the train; carrying out feature extraction on the intercepted to-be-identified lock catch part image; inputting the extracted features into the trained improved deep residual shrinkage network, and outputting position information and category information of the lock catch component through the trained improved deep residual shrinkage network. The method can be applied to train lock catch loss fault detection.

The invention discloses an effective image-region detection and segmentation method for iris recognition. The method comprises: S1, roughly positioning an iris on the basis of Purkinje image analysis in an iris image; S2, accurately positioning the inner and outer boundaries of the iris on the basis of an elastic force model; S3, positioning upper and lower eyelids of the iris on the basis of sorting filtering and histogram filtering; and S4, detecting lashes and shadow on the basis of a lash-shadow blocking-degree prediction model in the image. The method can rapidly and accurately obtain the boundaries of the iris, effectively solves the problems that the conventional iris segmentation algorithm is low in speed and precision, and provides rapid reliable positioning and segmenting results for subsequent iris feature analysis. The method can be widely used in a large number of application systems using iris recognition for identity recognition and security protection.

The invention discloses a device for measuring outer diameter, which comprises a base, and is characterized in that a stopper is provided at one end of the base, a raised rib is provided in the middle of the base, and on the base between the stopper and the rib A socket is provided, and two horizontal positioning columns are fixed on the side wall of the block. The rib plate is provided with a horizontal through hole, and a horizontal notch connected with the through hole is provided on one side of the through hole. , the ribs above and below the notch form a pair of splints, a dial gauge is installed in the through hole, the probe of the dial gauge is located on one side of the positioning column, and the two horizontal positioning columns and the probe of the dial gauge are on the circumference The upper and lower ribs are connected by bolts. The invention can eliminate the influence of personnel factors on the detection, and accurately determine whether the product to be tested is qualified.

The invention discloses an intelligent bathing device and a method for implementing reminding of long bathing time. The bathing device comprises a bathing device body, a water level detecting device,a controller and a reminding device. The water level detecting device is used for acquiring water level data of the bathing device body; the controller is used for processing water level data, starting timing when a water level data change is larger than a first set value and outputting a control command when timing time is larger than or equal to a second set valve; the reminding device is used for sending reminding signals; an output of the water level detecting device is connected to an input of the controller, and an output of the controller is connected to the reminding device. The intelligent bathing device and the method for implementing reminding of long bathing time have advantages that the water level data of the bathing device body can be acquired in real time, timing is startedwhen the water level data change is larger than the first set value, and the reminding signal is outputted when the timing time is larger than or equal to the second set valve, so that a user can bereminded of long bathing time and protected from feeling dizzy and even passing out due to excessively long bathing time, and prevention and protection of user health can be realized.

The invention provides a chip temperature detection circuit and an audio power amplifier. The chip temperature detection circuit comprises a temperature sampling unit, a first control unit, a first buffer unit, a second buffer unit, a second control unit and a comparison and amplification unit. Through the temperature sampling unit, the buffer units and the comparison and amplification unit, temperature sampling voltage can be obtained so that the temperatures of chips can be obtained according to the temperature sampling voltage, thereby eliminating the influences, on current detection of loudspeakers, of temperature changes; and through the first and second control units which are alternately operated under a first state and a second state, the influences, on the temperature sampling voltage, of offset voltage generated by process deviations of the buffer units are eliminated, so that the correctness of chip temperature detection results is improved.

The invention provides a pressure measuring device and method of fiber difference interference. The device comprises a fiber laser unit, a fiber coupling unit, a reflection difference unit, a fiber beam expanding and collimating unit, a photoelectric detection unit, a storage unit and a signal processing unit; and the reflection difference unit includes a reflection phase grating of a special structural design, and used to cut reflected light waves. The reflection phase grating includes two non-light-transmission parts and two reflection light parts in one period; the two reflection light parts include a direct reflection part (without phase delay) and a pai-phase delayed reflectin part; and the duty ratio of the reflection phase grating is 1 / 2, namely, the proportion of the size of the non-light-transmission parts to that of the reflection light parts is 1 / 2. The device of the invention can be used to realize pressure measurement of high temperature and high corrosion, and has advantages including being resistant to electromagnetic interference and radiation. In addition, a differential pressure type flowmeter is combined to realize high-temperature medium flow measurement.