Device and method for quickly measuring retroreflection coefficient of traffic signs
A technology of retroreflection coefficient and traffic sign, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of detector influence, low measurement accuracy, poor accuracy, etc. high precision effect
Active Publication Date: 2020-12-04
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
However, this method does not consider the intensity of the outgoing laser light, and simply corresponds the retroreflection coefficient to the laser reflection intensity information, which makes the measurement value of the retroreflection coefficient low in reliability and accuracy.
At the same time, the detector is easily affected by other light sources in the environment, and affected by the initial responsivity of the photodetector, the measurement accuracy is largely limited
[0005] Patent Document 2 discloses a device for measuring the photometric performance of road markings. It is a measuring device for measuring the absolute value of the retroreflection coefficient. For a fixed laser beam direction, the retroreflection coefficient is only measured at one observation angle, and it is also easy Interference with other light sources in the environment leads to poor measurement accuracy
At the same time, the device needs to be calibrated before each measurement. During the measurement, it is necessary to ensure that the laser spot is aligned with a single road marking, and there are many road markings in the same field of view, which also leads to the problem of low measurement efficiency.
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[0051] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0052] The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of description, the sizes...
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The invention discloses a traffic sign retroreflection coefficient rapid measurement device and a method. The traffic sign retroreflection coefficient rapid measurement device comprises a laser, a transmitting unit, receiving units, a photoelectric detector and a control unit. Wherein a first receiving unit receives an echo signal formed by reflecting a laser pulse signal by a retro-reflection target at a first observation angle, and first point cloud data is obtained; a second receiving unit receives an echo signal formed by reflecting the laser pulse signal by a retro-reflection target at asecond observation angle different from the first observation angle, and second point cloud data is obtained, and determining of a retro-reflection coefficient of the retro-reflection target by the control unit according to the incident angle, the incident light intensity, the first observation angle, the first point cloud data, the second observation angle and the second point cloud data is realized. Compared with the prior art, the retro-reflection coefficient measurement technology is less affected by ambient light, and the measurement precision is high.
Description
technical field [0001] The present application relates to the technical field of material analysis or testing by means of optical means, in particular to a device and method for rapidly measuring the retroreflection coefficient of retroreflective materials such as traffic signs. Background technique [0002] Retroreflective materials (generally called reflective materials) are widely used in road traffic signs, markings, contour marks, vehicle reflective signs, motor vehicle license plates, special operating clothing, fire instructions, railway signs, industrial and mining safety production signs, etc. , Safety production and other aspects have played an important role. [0003] Coefficient of retroreflection, or retroreflection coefficient, commonly known as reflective brightness, its unit is candela per lux per square meter, is an important indicator for judging the performance of retroreflective materials. It is known that the coefficient of retroreflection can be measur...
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IPC IPC(8): G01N21/01G01N21/552
CPCG01N21/01G01N21/552
Inventor 朱东涛胡以华杨星赵楠翔顾有林陈杰王磊邵慧
Owner NAT UNIV OF DEFENSE TECH