Question:
The instrument used for the direct measurement of surface quality by dragging a stylus across the surface is:
The instrument used for the direct measurement of surface quality by dragging a stylus across the surface is:
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Whenever contact-type surface roughness profiling is mentioned via a traveling stylus, the measuring device is a Profilometer or Profile meter.
Updated On: Jul 9, 2026
- Clinometer
- Sine bar
- Autocollimator
- Profile meter
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The Correct Option is D
Solution and Explanation
Concept:
Surface metrology tools are designed to evaluate the topography, roughness, or angular characteristics of components:
• Clinometer Sine bar Autocollimator: Instruments specifically used for angular measurement, flatness determination, or straightness testing.
• Profile meter (Profilometer): An instrument designed explicitly to quantify surface roughness and texture profile parameters ($R_a, R_z$, etc.).
Step 1: Analyze the operational mechanism described. The core mechanism involves physically dragging a sharp diamond stylus across the workpiece surface at a controlled speed. As the stylus traverses the surface texture, its microscopic peaks and valleys cause it to deflect vertically.
Step 2: Map the mechanism to the correct metrological instrument. These vertical movements are converted by a transducer (such as a piezoelectric crystal or inductive coil) into an electrical signal. This signal is amplified and processed to map the surface variations. This stylus-based tracking system defines the working principle of a Profilometer or Profile meter.
• Clinometer Sine bar Autocollimator: Instruments specifically used for angular measurement, flatness determination, or straightness testing.
• Profile meter (Profilometer): An instrument designed explicitly to quantify surface roughness and texture profile parameters ($R_a, R_z$, etc.).
Step 1: Analyze the operational mechanism described. The core mechanism involves physically dragging a sharp diamond stylus across the workpiece surface at a controlled speed. As the stylus traverses the surface texture, its microscopic peaks and valleys cause it to deflect vertically.
Step 2: Map the mechanism to the correct metrological instrument. These vertical movements are converted by a transducer (such as a piezoelectric crystal or inductive coil) into an electrical signal. This signal is amplified and processed to map the surface variations. This stylus-based tracking system defines the working principle of a Profilometer or Profile meter.
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