GAAS SUBSTRATE THICKNESS MEASUREMENT
Industry Semiconductor Applications Gaas Substrate Thickness Measurement Measurement Type Thickness Description Measuring Thickness of Wafers with Different Chemistries Introduction: Silicon wafers are ordinarily highly conductive and easy to measure with standard capacitive displacement sensors (See MTI’s Proforma 300i). Measuring the thickness of GaAs wafers that have high bulk resistivity (>10k Ohm/cm) is a little more difficult because the wafers act as non-conductive insulators in a capacitive sensor’s measuring field. Fortunately, MTI has a solution to this problem. Solution: It’s possible to measure the thickness and TTV of high resistivity semiconducting wafers (like GaAs) using non-contact capacitive [...]
Spindle Run Out
Industry Automotive Applications Spindle Run Out Measurement Type Positioning Description Rotating targets frequently have an intermittent, uncertain or nonexistent ground path. This introduces unwanted noise, instability, drift and reduces accuracy of the measurement. MTI Instruments offers a unique “Push-Pull” capacitance measurement system that does not require a grounded target. It utilizes two probes, built into one body, that work together to complete the ground path. One probe pushes current into the brake rotor while the adjacent probe pulls the current out. The result is a “clean”, consistent electrical sensing path. As the [...]
CAPACITANCE SENSORS FACILITATE 3D IC CONSTRUCTION
[Application Note 70518] To boost device performance, today’s semiconductor and microelectronics manufacturers are building three-dimensional integrated circuits featuring vertically-stacked silicon wafers and dies. The rationale is simple. Exploiting the Z-axis avoids the power and footprint penalties associated with two-dimensional processes. Implementing the rationale, however, is not so simple. Going vertical requires coplanar surfaces to make contact with all pins, pads, and pillars. Problem Typically, manufacturers measure the angle and gap between two planes to determine coplanarity. Bonding tool actuators rely on these angle/gap measurements to adjust components and make sure all device pins and/or solder balls reside on the [...]
CAMERA SHIELD MEASUREMENT
Equipment Setup Equipment Used DTS-25-04 laser head Rotary Stage PC with Digital Microtrak Basic Support software Setup Power is automatic mode. Filter is 100Hz Sample rate is 1000 samples sec The head was operated in diffuse mode (not specular/tilted) Validation of Setup The setup should be validated by performing a total runout scan on the rotary stage with no target present. The stage should be cleaned with Isopropyl alcohol and allowed to dry prior to the scan. This reduces any dust or dirt accumulation which will give a false reading of runout. A 360-degree runout of the rotary table, [...]
MONITOR ROLLER GAPS AND PARALLELISM
Easy Roller Gap Measurement Ensures Calendering Success Many roll-to-roll finishing processes typically use a calender, or series of hard pressure rollers, to deliver smooth, high-quality products of plastic, textile, or paper (Fig 1). Ensuring a consistent material thickness, however, depends on the ability to monitor, and maintain, a precise gap between rollers. This application note describes a quick and easy means for roller gap measurement. Problem Establishing a roller gap and checking for parallelism across roller width can be a slow and cumbersome procedure. Manual measurement requires multiple sized feeler gauges which can introduce errors. Misinterpreting feeler gauge drag, [...]
ANGLE MEASUREMENT AND MONITORING
Introduction So what do sheet metal, speakers, and wine bottles all have in common? They represent the many angles and profiles that can be measured with laser sensor head. Angles: Numerous applications call for measuring angles such as sheet metal Press Brake applications. As the Press Brake bends the sheet metal, the controller reads the actual bend angle from the sensor head and can control under/over bending to reduce product waste and time. Sensor measurements can easily be interfaced with Press Brake control systems and allow an operator to: detect the bend angle monitor distortion of the punch and dies [...]
ADDING A DIGITAL PANEL METER TO MTI ANALOG OUTPUT PRODUCTS
How To Use Digital Displays with Analog OutputsMTI Microtrak 3 Lasers and some of our Accumeasure amplifiers such as the Accumeasure 9000 only have analog outputs. If you wish to add a digital display, then the Lascar Panel pilot © makes a nice cost effective (~ $110) addition – Fig 1. These Digital panel meters have both 1 & 2 channel display capability and the user can customize the display with a variety of interesting formats. The meter can operate off 4-30VDC which is compatible with the MT-3 power supply and the panel meter inputs can handle 0-10V which is compatible with [...]
PRECISION LASER MEASURING TOOLS
If you are looking for high quality, reliable precision laser measurement tools and devices then you are in the right place. MTI Instruments is a manufacturer of precision tools, systems and solutions for clients requiring the precise measurement and control of products and processes, and for the development and implementation of automated manufacturing, assembly, and complex machinery operation. Our product solutions are used in: Engine vibration analysis systems for military and commercial aircraft applications Industrial manufacturing/production markets Research, design and process development market. Non-Contact Measurement Turbine Balancing & Vibration Analysis Semiconductor/Solar Metrology Systems Signal Generator Applications When it comes [...]
Windshield Manufacturing
Industry Automotive Applications Oil Film Measurement Type Level Description In order to maintain proper profile and thickness within a glass furnace the extrusion plate spacing must be maintained at a predetermined gap. Unfortunately, due to process changes and temperature swings this gap can fluctuate significantly in short periods of time. This variation causes the glass thickness to change (check out our glass thickness measurement devices to accurately measure thickness), producing uneven temperature gradients and creating potentially weak glass panels. To control this critical parameter the manufacturing process requires automated active feedback [...]
Brake Rotors Thickness Variation
Industry Automotive Applications Brake Rotors Thickness Variation Measurement Type Surface Description Driving cross country or cross town, we give little thought to the operation or complexity of our vehicle braking systems. They only cross our mind when we absolutely need them; we never stop to think about the extensive design and testing that makes them such a lifesaver. Take the brake rotor for example. Under normal operating conditions it’s subjected to extreme temperatures and forces, which can cause rotor distortion and potential failure. To make certain it can withstand [...]