36 results about "Standard ruler" patented technology

The invention discloses a surveying and mapping method for an ancient architecture by matching a digital camera with a measuring tool. The digital camera and the measuring tool are taken as tools to measure vertical-face dimension of an architecture in a single-image mode under a condition that elements of interior orientation are not known and elements of exterior orientation are known or measurable; the surveying and mapping method specifically comprises the following steps: measuring a vertical distance between a photographing point and an external vertical face of the architecture by using the measuring tool; fixing horizontal and vertical standard rulers on the external vertical face of the architecture; keeping the digital camera in a horizontal state for photographing to obtain photos of a to-be-measured area, obtaining image space dimensions of the standard rulers by virtue of the photos; determining a scale value of the image space dimensions and an object space dimension in the horizontal direction and the vertical direction by utilizing proportional relation of similar triangles according to the image space dimension of the standard rulers; respectively obtaining the dimension of each part of the external vertical face of the architecture in the horizontal direction and the vertical direction according to the scale value of the image space dimensions and an object space dimension in the horizontal direction and the vertical direction. The method disclosed by the invention can simply and quickly measure the vertical face dimension of the architecture, and improves surveying and mapping precision and the working efficiency.

The invention discloses an automatic verification system for a steel tape, comprising a horizontal horizontal support, a zero alignment device, a tension loading and unloading device and a camera, wherein the zero alignment device, the tension loading and unloading device and the camera are all arranged on the horizontal horizontal support superior. The zero alignment device includes a precision displacement table, a clamping mechanism for the tested scale and a clamping mechanism for the standard scale. The tension loading and unloading device includes the clamping mechanism of the checked ruler and the loading mechanism that drives the clamping mechanism of the checked ruler to move rightward to apply the rated tension force to the checked ruler. The invention also discloses a verification method of the automatic verification system for the steel tape measure. When the verification system of the present invention is applied, it is convenient to realize loading and unloading of steel tape tension force and zero alignment during the verification process, can reduce labor intensity, and can improve work efficiency and measurement accuracy.

The invention discloses a method for precisely measuring focal distance of a superlong-focal-distance space camera, relates to the technical field of optical measuring methods and solves the problem that an existing method for measuring the focal distance of a long-focal-distance space camera is low in measuring accuracy, high in expense needed by supporting equipment and the like. The method includes adopting a spherometer to measure curvature of a spherical standard lens of an interferometer, adopting a mirror surface locator to measure lens thickness of the standard lens, and calculating focal distance of the spherical standard lens of the interferometer according to the curvature radius and the lens thickness which are acquired; adopting the mirror surface locator to measure length of a standard ruler, and placing the standard ruler after length measuring on a two-dimensional adjusting platform; placing the measured camera, a plane mirror and the standard ruler in front of the interferometer, performing coarse adjusting, and performing precise adjusting on the plane mirror; enabling an interferogram of the measured camera to image on a detector of the interferometer; adopting a four-quadrant analysis method to calculate an image on the detector, and acquiring length of an image of the standard ruler; acquiring the focal distance of the measured camera according to the focal distance of the dry standard lens, the length of the standard ruler and the length of the image of the standard ruler.

A proportional ruler for dividing a length into equal parts or converting a given length into a proportional length comprises a standard ruler scale and proportional scales with specific proportional coefficients. While a standard ruler scale gives a reading of actual length of an object, proportional scales will give a length equal to the actual length over the proportional coefficient. If a proportional coefficient is a whole number, the scale can be used as a divider to divide a length into the whole number of equal parts.

The invention provides a full-airplane horizontal measurement method based on a work space measurement location system. The method comprises first determining the number of measured work spaces and laser scanning base stations according to appearance dimensions and positions of measuring points; then using a standard ruler to calibrate external parameters of the measured work spaces formed by all the laser scanning base stations, and building a work space measurement location system coordinate system; then unifying the work space measurement location system coordinate system and an airplane coordinate system; using vector rods of the work space measurement location system to respectively perform contact measurement on each measuring point; and finally enabling measured coordinate values of each measuring point to be led into a data processor of the work space measurement location system, and comparing the actually-measured coordinate values with a theoretical value so as to judge whether airplane deformation is within an allowed range. The full-airplane horizontal measurement method solves the problems that a traditional airplane horizontal measurement method is poor in measurement precision, large in workload and low in measurement efficiency and is subjected to influences of operator's proficiency and the like.

A precision measurement method for the focal length of an ultra-long focal length space camera relates to the technical field of optical measurement methods, and solves the existing problems of low measurement accuracy and high cost of supporting equipment when measuring the focal length of a long focal length camera. The invention uses a spherometer to measure the spherical standard mirror of an interferometer radius of curvature, use a mirror locator to measure the lens thickness of the standard mirror, and calculate the focal length of the interferometer spherical standard mirror according to the obtained radius of curvature and lens thickness; Place it on the two-dimensional adjustment platform; place the camera under test, plane mirror and reference ruler in front of the interferometer and perform coarse adjustment and fine adjustment of the plane mirror; make the interferogram of the camera under test image on the detector of the interferometer; use four The quadrant analysis method calculates the imaging on the detector to obtain the length of the image of the reference ruler; according to the focal length of the dry standard mirror, the length of the reference ruler and the length of the reference ruler image, the focal length of the camera under test is obtained.

The invention discloses a surveying and mapping method for an ancient architecture by matching a digital camera with a measuring tool. The digital camera and the measuring tool are taken as tools to measure vertical-face dimension of an architecture in a single-image mode under a condition that elements of interior orientation are not known and elements of exterior orientation are known or measurable; the surveying and mapping method specifically comprises the following steps: measuring a vertical distance between a photographing point and an external vertical face of the architecture by using the measuring tool; fixing horizontal and vertical standard rulers on the external vertical face of the architecture; keeping the digital camera in a horizontal state for photographing to obtain photos of a to-be-measured area, obtaining image space dimensions of the standard rulers by virtue of the photos; determining a scale value of the image space dimensions and an object space dimension in the horizontal direction and the vertical direction by utilizing proportional relation of similar triangles according to the image space dimension of the standard rulers; respectively obtaining the dimension of each part of the external vertical face of the architecture in the horizontal direction and the vertical direction according to the scale value of the image space dimensions and an object space dimension in the horizontal direction and the vertical direction. The method disclosed by the invention can simply and quickly measure the vertical face dimension of the architecture, and improves surveying and mapping precision and the working efficiency.