# How to Measure Curved Surfaces

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Measuring the relfected atributes of curved surfaces is challenging (or impossible) with a standard glossmeter. The Rhopoint Aesthetix addresses these issues with its advanced optical design, optional small measurement beam and interactive measurement feature.

### **Preparation**

1. **Adaptor Selection**
    - Replace the standard flat surface adaptor with the curved surface/small parts adaptor, Novo-Curve Adaptor or custom 3D printed Jig. This adaptor reduces the beam size, making it suitable for curved surfaces.
      [Aesthetix removeable adaptors and jigs](rhopoint-aesthetix-curved-surfaces-non-contact-measurement.md)
    - To attach the adaptor:
        - Remove the standard adaptor by pulling it off (magnetically attached).
        - Attach the curved surface adaptor securely in its place.
2. **Calibration**
    - Recalibrate the instrument after changing adaptors to ensure accurate measurements. Use the supplied calibration tile certified to meet traceability standards.
3. **Positioning Tools (Optional)**
    - For repeatable measurements on small or complex parts, use bespoke 3D-printed jigs or a laboratory stand. These tools help maintain consistent positioning during measurement.

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### **Measurement Procedure**

#### **Using the Curved Surface Adaptor**

1. **Instrument Placement*
    - Use the interactive measurement feature to ensure that the measurement beam is centred on the reflection image. Misalignment can lead to inaccurate results.
      [How to measure Surface Brilliance](rhopoint-appearance-elements-using-aesthetix-with-ae-aesthetix-modules-surface-brilliance-how-to-measure-surface-brilliance.md)
2. **Measurement Execution*
    - Press the measurement button once alignment is confirmed. The Aesthetix will capture data for gloss, haze, DOI, and other parameters simultaneously.

#### **Non-Contact Measurement (Optional)**

For fragile or delicate surfaces:
1. Mount the Aesthetix on a height-adjustable stand or integrate it into a COBOT system. Ensure that the focal distance is maintained at 10 mm ± 0.5 mm from the target surface.
2. Follow steps for live alignment and execute measurements as described above.

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### **Tips for Accurate Measurement**

- Avoid measuring surfaces with a radius smaller than 0.5 m using standard adaptors; always use the curved surface adaptor for such cases.
- For highly complex shapes, consider non-contact measurement methods combined with custom jigs or COBOT systems for precise alignment.
- Regularly calibrate the instrument to maintain accuracy, especially after changing adaptors or environmental conditions.

### **Applications**

The Rhopoint Aesthetix excels in industries requiring precision appearance control of curved components, such as:

- Automotive (e.g., chrome trims, high-gloss paint finishes)
- Medical devices (e.g., orthopedic implants)
- Consumer electronics (e.g., buttons, casings)
- Pharmaceuticals and confectionery (e.g., pills, candy coatings).

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By following these steps and leveraging its advanced features, you can achieve reliable and repeatable measurements of curved surfaces with your Rhopoint Aesthetix instrument.