Hi Mark,
There are many tools available for measuring solder paste height. Most machines use laser as the basis for inspection while others use structured white light. If simple height and width inspection is all that is required, you can look into the single laser stripe inspection systems such as CyberOptics and LaserVision Technologies. Most machines can be purchased anywhere from $3,000 - $12,000 on the used market. New prices tyically range from $12,500-$20,000. If you have the need to measure volume, then your best bet is to look into a machine that provides "true volume" capabilities. Either a laser line scanning system or system using structured white light is the only way to accurately measure volume. Single laser stripe inspection systems can only estimate volume by drawing a region around the feature to establish an x,y (area) measurement. This value is then multiplied by the cross sectional height value to provide what is commonly called estimated volume. Whereas the true volume inspection systems calculate the volume of every cubic mil based upon each pixel in the Field of View. The downside of the true volume inspection system is price. On the used market, the price is normally around $15,000-$35,000. New prices range from $25,000-$50,000. ASC International and a few others can provide equipment to meet this level of inspection. Your best bet is to search the internet to find the companies providing this type of equipment. By typing "solder paste inspection", you will be surprised at the number of companies offering this equipment.
Good Luck.
Steve
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