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optical microscopic morphology observation and measurement

project introduction:

the optical microscope uses the zoom lens imaging principle to magnify the human eye cannot distinguish tiny objects to the size of the human eye can distinguish which is mainly to increase small objects near the eye opening angle (objects with large visual angle forms lager image in the retina). ordinary light wavelength is 400 ~ 700 nm, the best resolution of the optical microscope is 0.2 um, the resolution of the human eye is 0.2 mm, so the highest magnification microscope is usually 1000 x. the general optical microscope objective lens with multiple can be replaced, so observers can change the magnification as required. because of using visible light as light source, optical microscope for color recognition is very sensitive and accurate, not only can observe the sample surface structure but also can observe a certain range below the surface of the tissue.

applications:

optical microscope with easy operation, intuitive, and check efficiency characteristics, is suitable for surface observation and measurement. it can not only identify and analyze a variety of metals, alloys, non-metallic products, surface defects and integrated circuits, printed circuit boards, wires, fibers, surface coating and other surface phenomena checks, but can also be  widely used in electronic, chemical industry and instrument material observation of opaque and transparent material.

visual inspection

purposes:

each industry pays more and more attention to the appearance issue and is stricter with product manufacturing process. products appearance rating largely reflects the quality of products. by using optical amplifier assist device check product appearance, assembly, surface defects such as cracks, holes and poor welding, test production line process, the quality of the printed circuit board and weld defects of circuit components etc; to help monitor the production process, take timely corrective action on test results; to provide guidance for the operation of the production process and product quality assurance; to ensure the products meet the shape, fit and functional requirements in the final use environment.

applications:

according to the using characteristic of parts, acceptance criteria generally include three conditions: ideal condition, acceptance condition, reject condition. mainly used in tooling fixture, metal parts, electronic products assembly, abnormal deviation, welding abnormal inspection, detects inspection of pcb/pcba lines, prevent welding, holes, parts alignment and text graphics.

test flow：

confirm the sample type→confirm the inspection specification→put the sample under the optical microscope and observe the phenomenon→result evaluation

reference standard:

ipc-6012,ipc-a-610 ,ipc-a-600

typical test images:

foreign body on the surface of welding plate	foreign body on the surface of through hole

size measurement

purposes:

measurement is the basis of the measure of material quality, comparing the physical quantity with the standard unit quantity, checking whether the dimensions/internal wiring conform to the requirements of the relevant standards and drawings. the size of the abnormal image artifacts can be stored for finding the cause and helping quick access to the actual size, product quality inspection and precise process control.

applications:

compared to traditional manual measurements and mechanical measurement, optical measurement size has high-precision (generally to 0.01mm), high speed (about 100 ms), objective, reliability, high repeatability, non-contact, no damage. it is mainly used in machinery, tools prototypes, small and medium-sized machinery, gears, cams, worm and other measurements, electronic components in electronic industry, inside and outside size of products (length, width, thickness, inner diameter and outer diameter), hole spacing, height and depth of the hole diameter measurement, the connector pin spacing, detection of coplanar degree, etc.

test flow： 

confirm the sample type→confirm the inspection specification→select test position→

make sections (if necessary)→put the samples under the optical microscope to observe and take pictures→results output

reference standard:

ipc-6012,ipc-a-610 ,ipc-a-600

typical test images:

line width / line distance measurement	hole wall thickness measurement