Coin Inspection  


Executive Summary

Optimet's Conoscan 4000 and Conoprobe Mark 10 HD with a 25mm gold lens were used in coin inspection. The main inspection was on two samples of coins. Using Optimet's highly qualified technology for scanning, we achieved optimal performances on both samples (diffusive and reflective).

1. Optimet's Advantages over Other Technologies:

Due to the Conoprobe sensor's capability to change laser power and SNR filter, optimal methods of scanning are easily reached for both diffusive and reflective areas.

2.Application Description

Coin (fig.1-2) scans using Conoscan 4000 during quality control process of the mold.


2.1 Tests Purposes
a. Learn the history & results of previous experiments
b. Find the optimal scanning method to achieve best performance on the two samples (diffusive and reflective).

2.2 System Setup
Conoscan 4000, Conoprobe Mark 10 HD + 25mm Gold lens and raised platform (using Newport stage) (fig.3).


3. Method and Results

Optimal scanning method for coin number 1 (fig.4-6) was found to be: Sensor: Conoprobe MK10 HD S/N 20405, 25mm gold lens. No QWP. Autoexposure off. Freq: 3kHz, resolution: 12X12 µm, scan axis: Y. Total filter: 1200-30000.
Diffusive optimized :
  • Laser power: 1500
  • SNR filter: 40%
Reflective optimized :
  • Laser power: 600
  • SNR filter: 30%



Optimal scanning method for coin number 2 (fig.7) was found to be: Sensor: Conoprobe MK10 HD S/N 20405, 25mm gold lens. No QWP. Autoexposure off. Freq: 3kHz, resolution: 12X12 µm, scan axis: Y. Total filter: 1200-30000.
  • Laser power: 1200
  • SNR filter: 40%

4. Data

Parameter Value
Reflective/Diffusive/Transparent/Translucent Diffusive/Reflective
Working Range (mm) 0.6
Precision (µm) 1
Stand Off (mm) 14
Max. Data Rate (KHz) 3
Lateral Resolution  12*12
Z Resolution  -
Application Category  ‐ 



Download Coin Inspection file (pdf)