Glass surface stress detection device
The utility model relates to a kind of optical detection apparatus, particularly relates to a kind of pick-up unit detected the surface stress of glass.
Glass is material all common in daily life and commercial production, and such as tempered glass, as the one of the safety glass known by people, is widely used in the fields such as building, automobile, glass curtain wall, glass household products.For tempered glass, for improving the intensity of glass, in manufacturing process, usually using the method for chemistry or physics, form a certain size compressive stress at glass surface, first offset skin stress when glass bears external force, thus improve load-bearing capacity.For simple glass, due to the various technogenic influences in process, also can residual stress in glass plate, if stress exceeds certain limit, then significantly sacrificing is caused to the usability of glass, form defect, therefore stress level normally weighs the important indicator of glass sheet quality, relates to the use safety of glass plate.
For obtaining this index, in standard regulations such as GBs, birefringent mode is adopted to measure the surface stress of glass, to characterize the stress level of inside glass.At present, in actual use, the method measuring glass surface stress can be summarized as two kinds: angle polarisation method GASP (Grazing Angle Surface Polarimetry) is plunderred on differential surface refraction process DSR (Differential Surface Refractometry) and surface.Wherein DSR mode due to use optical element less, the price of detecting instrument is relatively low, is widely adopted by various testing agency.Existing DSR mode glass surface tension gauge volume is comparatively huge, most dependence is manually estimated by micrometer eyepiece counter stress, then go out stress value according to formulae discovery, such method is obviously subject to the restriction of gauger's naked-eye observation precision, is also unfavorable for the data processing of electronization.
Utility model content
The utility model provides a kind of glass surface stress detection device, the birefringent light returned from glass surface to be measured is obtained by providing the compact sized optical system in light shield, coordinate the image capture apparatus of electrophotography, high-precision testing result can be obtained, avoid the impact of veiling glare.
According to a kind of glass surface stress detection device of the present utility model, comprise shading outer cover, lighting unit, detect prism and image-generating unit, it is inner that described lighting unit, detection prism and image-generating unit are all positioned at shading outer cover; Wherein, described shading outer cover defines the physical dimension of pick-up unit in order to shield external stray light to the impact detected; Described detection prism is by the surface contact of REFRACTIVE LIQUID and detected glass, enable to inject from described lighting unit the light detecting prism to be totally reflected on the contact surface, thus in light after total reflection, introduce the information comprising glass birefringence ability, enter image-generating unit and carry out imaging; Described image-generating unit comprises at least two catoptrons, and the position of in described at least two catoptrons can be regulated by user.
Further, lighting unit comprise LED light source and be placed in light source after light filter for filtering light source emergent light in light path.
Preferably, detecting prism is square prism, regulates the mode of the first reflector position to be that screw regulates.
Concrete, image-generating unit comprises the first catoptron successively along optical path direction, lens combination, the second catoptron, analyzing prism and photo-sensitive cell; First catoptron is that the catoptron that regulates can be carried out by user in position.Photo-sensitive cell is the one in CCD, CMOS or PMT, and analyzing prism is the mutually perpendicular polaroid splicing of two panels or adopts one or more polarization splitting prism.
Image-generating unit can comprise the 3rd catoptron further, after the 3rd catoptron described on optical path direction is positioned at the second catoptron, and relative with the reflecting surface of the second catoptron.
3rd catoptron is rotatable, and by analyzing prism between described second catoptron and described 3rd catoptron, described image-generating unit comprises visualization unit further, and described visualization unit and described photo-sensitive cell are relative to described 3rd mirror conjugation.
Photo-sensitive cell is electrically connected with data processing unit, and described data processing unit is the small-sized data processor be placed in shading outer cover, and described shading outer cover has display unit, at least comprises the graph image interface of testing result in order to display.
According to glass fragment pick-up unit of the present utility model, owing to employing shading outer cover, avoid the impact of parasitic light during detection, utilize again catoptron multiple reflections to shorten the space occupied by overall light path, only regulate the use of a catoptron, reduce use difficulty, achieve the miniaturization of pick-up unit, improve Detection job.
Accompanying drawing explanation
Fig. 1 is according to glass surface stress detection device schematic diagram of the present utility model.
Fig. 2 is according to the image schematic diagram on photo-sensitive cell in glass surface stress detection device of the present utility model.
Fig. 3 is according to display unit schematic diagram in glass surface stress detection device of the present utility model.
Fig. 4 is another embodiment schematic diagram according to glass surface stress detection device of the present utility model.
Below, with reference to accompanying drawing, embodiment of the present utility model is described in detail.In the following description, for ease of understanding and describing, identical parts employ identical number designation.
Fig. 1 is according to glass surface stress detection device schematic diagram of the present utility model.As shown in Figure 1, glass surface stress detection device 100 of the present utility model, comprise shading outer cover 1, lighting unit 2, detect prism 3 and image-generating unit 4, shading outer cover defines the physical dimension of pick-up unit in order to shield external stray light to the impact detected, lighting source, it is inner that detection prism and image-generating unit are all positioned at shading outer cover, wherein detect the surface contact of prism by REFRACTIVE LIQUID and detected glass 5, be totally reflected on the surface in contact detecting prism and detected glass to enable injecting by lighting source the light detecting prism, thus in light after total reflection, introduce the information comprising glass birefringence ability, enter image-generating unit again and carry out imaging.
For the energy-conservation facility with supply voltage is considered, the light source 21 that lighting unit uses is preferably LED light source, light source light-emitting window or close on light-emitting window light path near use the light of the light filter of such as interference filter 22 to light source outgoing to purify, inject again and detect prism 3, in order to reduce the overall volume of device, detecting between prism at light source 21 and catoptron 23 is set.Detecting prism 3 can be the rectangular prism etc. of circular arc type for triangular prism, the plane of incidence, and preferably, detecting prism 3 is square prism.Owing to filtering to the light of light source outgoing, the incident light detecting prism becomes the good light source of monochromaticity, decreases and detects light from light source light spectrum width after glass-prism boundary outgoing to the adverse effect measured.The incident angle of light source is determined by scientific algorithm, coordinates the use of the square prism of relevant parameter, avoids operating personnel and select in multiple step and affect measuring accuracy.
Image-generating unit comprises the lens combination 41, analyzing prism 42 and the photo-sensitive cell 43 that set gradually according to light path, further, image-generating unit also comprises at least two catoptrons, as shown in Figure 1, image-generating unit comprises the first catoptron a, the second catoptron b and the 3rd catoptron c, and wherein the first catoptron a is placed in and detects between prism 3 and lens combination 41, and close on detection prism, to enter lens combination 41 by from the light reflection detecting prism 3 outgoing; The reflecting surface of the second catoptron b and the 3rd catoptron c is oppositely arranged, and be all placed between lens combination 41 and analyzing prism 42, in order to the photoconduction that will be focused on by lens combination 41 to analyzing prism 42, again via photo-sensitive cell 43 imaging injecting such as CCD/CMOS/PMT etc. after analyzing prism, photo-sensitive cell presents the step difference image of such as Fig. 2.Further, the position closing on the first reflective mirror detecting prism can be regulated by user, thus regulate the angle entering the light of lens combination 41, the light of critical angle is irradiated on photo-sensitive cell after lens combination, present high-quality step difference image, regulative mode is preferably screw d and regulates, to improve the precision of ease for use and adjustment.Analyzing prism 42 can adopt the mutually perpendicular polaroid splicing of two panels or adopt one or more polarization splitting prism to realize.
The data processing unit (not shown) be electrically connected with photo-sensitive cell 43 processes step difference image, thus obtains the surface stress of glass.Data processing unit can be realized by the multi-purpose computer with data processing software, or use special small-sized data processor to realize, such as, single-chip microcomputer, FPGA, CPLD etc., small-sized data processor can be integrated in photo-sensitive cell 43, now in order to intuitively allow user understand testing result, on shading shroud surface or protrude from shroud surface and be provided with display unit 44.As shown in Figure 3, display unit 44 can comprise the graph image interface of display testing result, and the control small-sized data processor be built in pick-up unit carries out entity or the virtual keys such as such as initialization, clearing, calibration, fault detect, accordingly, display unit can be touch display screen.
Selectable, the 3rd catoptron c can omit, or the 3rd catoptron c is rotatable catoptron.When being rotatable catoptron for the 3rd transmitting mirror, as shown in Figure 4, imaging device also comprises visualization unit 45 further, now in the light path of described analyzing prism 42 between the second catoptron b and the 3rd catoptron c, visualization unit 45 and photosensitive unit 43 are relative to the 3rd catoptron c conjugation, user can select the 3rd catoptron c to rotate to shift out light path, thus observe with visualization unit 45 and artificial result of calculation, or after observing with visualization unit 45, the 3rd catoptron c is rotated and move into light path, make photo-sensitive cell 43 carry out image record and realize electronic surveying, be similar to the working method of DSLR camera.When use sense optical element realizes electronic surveying, preferably, the display unit (not shown in Fig. 4) on the built-in small-sized data processor of embodiment as shown in Figure 3 and outer cover is possessed
According to the glass surface stress detection device of embodiment, employ the impact that light shield unit avoids parasitic light, and shorten the space occupied by overall light path by use catoptron, achieve miniaturization, further, by other element except the first catoptron is all fixedly mounted, thus avoid affecting accuracy of detection to the adjustment of multiple element, reduce the difficulty that user uses, utilize the record of photo-sensitive cell to obtain the accurate testing result not relying on operator's visual operation technical ability simultaneously, achieve high-precision detection of electrons.
The utility model is not limited to above-described embodiment, and the various embodiments in instructions are only for being described, and it does not play restriction effect to protection domain of the present utility model.When not departing from the utility model scope, various changes and modifications can be carried out.In the ken that those skilled in the art possess, any omission that embodiment basis disclosed in the utility model is made, replacement or amendment will fall into protection domain of the present utility model.