Case Study: Infrared ND Filter 60% T
Data Table |
|
Specification |
Value |
Trans. 52% (OD 0.3) |
1600 – 5000 nm, T=52 +/- 4% |
Trans. 32% (OD 0.5) |
1600 – 5000 nm, T=32 +/- 3% |
Trans. 10% (OD 1) |
1600 – 5000 nm, T=10+/- 2% |
Trans. 1% (OD 2) |
1600 – 5000 nm, T=1+/- 0.3% |
Substrate |
Silicon |
Dimensions |
50 mm |
Thickness |
1.5 mm |
Scratch/Dig |
40/20 |
Quantity Per Year |
5 of each |


Case Study: Development of Neutral Density Filters for Diesel Pollutant Monitoring
Customer Challenge: The customer in the food and drink industry had a filter wheel that measured a range of properties from 1200-2400 nm. They needed an ND filter that could be used in any position of the wheel to trim the signal response by 60%. This had to be a fairly low-cost solution and the lead-time was critical.
Vortex’s Solution: Although the briefing from the customer was quite clear, we were able to supply some model data before any coating work to re-assure them we had understood the request correctly. Within days of the go ahead from the customer we were able to produce the job on plant using 0.5 mm thick 4 inch Silicon wafers (which we carry as stock) and dice to size in house.
Outcome: We met the specification of 60+/-2.5% at all wavelengths within the 1200-2400nm range (see spectral graph above), moreover the product left our factory 2 weeks after the initial call and within the customer’s budget expectation. This case study highlights our low inertia as a company and ability to solve problems and communicate effectively.