Thin-Film Serpentine RTD Sensor

Create a precise 3D CAD design of a thin-film resistive temperature sensor (RTD) using a serpentine/meander sensing track. DESIGN OBJECTIVE: Create a compact planar temperature sensor in which the serpentine metal track acts as the temperature-sensitive resistive element. The design should be suitable as a fabrication-ready prototype. GEOMETRY: * Overall substrate: rectangular, 30 mm × 20 mm. * Substrate thickness: 1.0 mm. * Use a glass or alumina substrate. * Place a centered serpentine sensing track on the top surface. * Serpentine track should run continuously from one electrical terminal to the other. * Use 10 parallel horizontal sensing sections connected alternately at both ends. * Track width: 0.30 mm. * Gap between adjacent tracks: 0.30 mm. * Use smooth 180-degree U-shaped bends; avoid sharp corners. * Active serpentine area approximately 20 mm × 12 mm. * Keep the sensing track symmetric and evenly spaced. * Provide two larger contact pads at opposite ends of the serpentine track. * Contact pads: approximately 3 mm × 3 mm. * Track should connect continuously to the contact pads without discontinuities. LAYERS: 1. Bottom layer: rectangular glass/alumina substrate. 2. Top layer: thin-film metal RTD sensing track. 3. Two enlarged metal contact pads for electrical connection. MATERIAL: * Primary sensing material: Platinum (Pt). * Also make the sensing-track material parameter editable so Ni or Cu can be selected later. * Contact pads should use the same conductive metal unless otherwise specified. FABRICATION CONSIDERATIONS: * Maintain uniform track width throughout the entire serpentine. * Maintain uniform spacing between neighboring tracks. * Avoid overlapping or short-circuiting adjacent sections. * Use smooth bends to reduce current crowding. * Keep the active sensing area away from the substrate edges. * Include dimensions for substrate, track width, spacing, active area, pad dimensions, and overall sensor size. OUTPUT: Generate: 1. Top-view fabrication layout. 2. Isometric 3D view showing substrate and thin-film sensing layer. 3. Fully dimensioned drawing. 4. Separate layers for substrate, sensing track, and contact pads. 5. Clearly label: * Substrate * Serpentine RTD * Contact Pad 1 * Contact Pad 2 * Track Width * Track Gap * Active Sensing Area 6. Make the geometry parametric/editable so track width, gap, number of turns, and overall dimensions can be modified easily.

Parameters

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