摘要:
A system and method for measuring lubricant thickness and degradation, carbon wear and carbon thickness, and surface roughness and debris on thin film magnetic disks at angles that are not substantially Brewster's angle of the thin film (carbon) protective overcoat in a high temperature environment. A focused optical light whose polarization can be switched between P or S polarization is incident at an angle to the surface of the thin film magnetic disk. The polarization switch can be accomplished using a temperature compensated quartz half plate. The range of angles can be from zero degrees from normal to near Brewster's angle and from an angle greater than Brewster's angle to 90 degrees. This range of angles allows the easy measurement of the change in lubricant thickness due to the interaction of the thin film head, the absolute lubricant thickness and degradation of the lubricant. It also allows the measurement of changes in carbon thickness and the absolute carbon thickness. The surface roughness can also be measured at any of the angles specified above.
摘要:
A system and method for measuring lubricant thickness and degradation, carbon wear and carbon thickness, and surface roughness of thin film magnetic disks at angles that are not substantially Brewster's angle of the thin film (carbon) protective overcoat. A focused optical light whose polarization can be switched between P or S polarization is incident at an angle to the surface of the thin film magnetic disk. The range of angles can be from zero degrees from normal to near Brewster's angle and from an angle greater than Brewster's angle to 90 degrees. This range of angles allows the easy measurement of the change in lubricant thickness due to the interaction of the thin film head, the absolute lubricant thickness and degradation of the lubricant. It also allows the measurement of changes in carbon thickness and the absolute carbon thickness. The surface roughness can also be measured at any of the angles specified above. The present invention utilizes a first and second histogram representing disk properties (1) at two different time periods, (2) at two different locations on the disk, or (3) on two different disks.
摘要:
A system and method for measuring lubricant thickness and degradation, carbon wear and carbon thickness, and surface roughness of thin film magnetic disks at angles that are not substantially Brewster's angle of the thin film (carbon) protective overcoat. A focused optical light whose polarization can be switched between P or S polarization is incident at an angle to the surface of the thin film magnetic disk. The range of angles can be from zero degrees from normal to near Brewster's angle and from an angle greater than Brewster's angle to 90 degrees. This range of angles allows the easy measurement of the change in lubricant thickness due to the interaction of the thin film head, the absolute lubricant thickness and degradation of the lubricant. It also allows the measurement of changes in carbon thickness and the absolute carbon thickness. The surface roughness can also be measured at any of the angles specified above. The present invention utilizes a first and second histogram representing disk properties (1) at two different time periods, (2) at two different locations on the disk, or (3) on two different disks.
摘要:
A system and method for measuring lubricant thickness and degradation, carbon wear and carbon thickness, and surface roughness of thin film magnetic disks at angles that are not substantially Brewster's angle of the thin film (carbon) protective overcoat. A focused optical light whose polarization can be switched between P or S polarization is incident at an angle to the surface of the thin film magnetic disk. The range of angles can be from zero degrees from normal to near Brewster's angle and from an angle greater than Brewster's angle to 90 degrees. This range of angles allows the easy measurement of the change in lubricant thickness due to the interaction of the thin film head, the absolute lubricant thickness and degradation of the lubricant. It also allows the measurement of changes in carbon thickness and the absolute carbon thickness. The surface roughness can also be measured at any of the angles specified above. The present invention generates a histogram from the specular and scattered components of the reflected light, generates a centroid of the histogram and performs a symmetry operation to identify the characteristics of the thin film.
摘要:
A system and method for measuring lubricant thickness and degradation, carbon wear and carbon thickness, and surface roughness of thin film magnetic disks at angles that are not substantially Brewster's angle of the thin film (carbon) protective overcoat. A focused optical light whose polarization can be switched between P or S polarization is incident at an angle to the surface of the thin film magnetic disk. The range of angles can be from zero degrees from normal to near Brewster's angle and from an angle greater than Brewster's angle to 90 degrees. This range of angles allows the easy measurement of the change in lubricant thickness due to the interaction of the thin film head, the absolute lubricant thickness and degradation of the lubricant. It also allows the measurement of changes in carbon thickness and the absolute carbon thickness. The surface roughness can also be measured at any of the angles specified above.
摘要:
A method comprises generating a data set comprising first surface roughness data from a first orientation and second surface roughness data from a second orientation and determining a roughness bias parameter from the first surface roughness data and the second surface roughness data.
摘要:
In one embodiment, a surface analyzer system comprises a radiation targeting assembly to target radiation onto a surface, a reflected radiation collecting assembly that collects radiation reflected from the surface, and a signal processing module. The signal processing module generates an image of magnetic characteristics of the magnetic disk, wherein the image comprises a plurality of servo sector arcs, locates a sample of points on a plurality of the servo sector arcs, fits a circle to the sample of points on each of the plurality of servo sector arcs, and determines at least one pivot-to-gap measurement from the radius of the circles.
摘要:
A method of detecting multi-surfaces of an object includes providing an imaging system capable of detecting surfaces of the object. After system parameters are set up, two-dimensional images of the object at multiple Z steps can be acquired. Each surface of the object can then be extracted using two steps. In a first step, the surface can be constructed based on a confidence threshold. In a second step, the surface can be enhanced using an interpolation filter.
摘要:
A method of detecting multi-surfaces of an object includes providing an imaging system capable of detecting surfaces of the object. After system parameters are set up, two-dimensional images of the object at multiple Z steps can be acquired. Each surface of the object can then be extracted using two steps. In a first step, the surface can be constructed based on a confidence threshold. In a second step, the surface can be enhanced using an interpolation filter.
摘要:
In one embodiment, a surface analyzer system comprises a radiation targeting assembly to target radiation onto a surface, a reflected radiation collecting assembly that collects radiation reflected from the surface, and a signal processing module. The signal processing module generates an image of magnetic characteristics of the magnetic disk, wherein the image comprises a plurality of servo sector arcs, locates a sample of points on a plurality of the servo sector arcs, fits a circle to the sample of points on each of the plurality of servo sector arcs, and determines at least one pivot-to-gap measurement from the radius of the circles.