Felix Instruments F-750

Status: Supported (scoped) · Vendor: Felix Instruments / CID Bio-Science · Extensions: .csv

The Felix Instruments (CID Bio-Science) F-750 Produce Quality Meter is a handheld VIS-NIR spectrometer (ZEISS MMS1 silicon photodiode array, ~310-1100 nm, 3 nm sampling) used for non-destructive fruit dry-matter and internal-quality models. Its desktop DataViewer software exports a wide CSV, so — like VIAVI MicroNIR and Si-Ware NeoSpectra — there is no dedicated F-750 reader: the export is decoded by the generic csv_like wide-table reader.

Instruments & software

F-750 Produce Quality Meter handheld; F-750 DataViewer desktop export software.

File structure

DataViewer “Export” produces a comma-delimited wide table: leading identifier / metadata / target columns, then numeric wavelength columns (nm), one spectrum per row. The canonical public example is the Mango DMC dataset (Anderson et al. 2020), whose columns are Set, Season, Region, Date, Type, Cultivar, Pop, Temp, DM followed by 285-1200 nm in 3 nm steps.

What nirs4all-formats extracts

  • Signals — absorbance over a nm wavelength axis, one record per spectrum row (the published export is log(1/R) absorbance).

  • Targets — numeric non-spectral columns (DM dry-matter %, Pop, numeric Season) are preserved as targets.

  • Metadata — text columns (Set, Region, Date, Type, Cultivar, Temp) and row_index are preserved as metadata.

Variants & support status

Variant

Status

Notes

DataViewer wide absorbance CSV

Supported

Via csv_like; one record per row, nm axis, DM target.

Raw-Spectra (reflectance) CSV

Planned

Same wide layout; reflectance signal type not yet asserted by a fixture.

Interpolated-Spectra (2nd-derivative) CSV

Planned

Derivative export; no fixture yet.

Native on-device / SD store

Blocked

No fixture; measurements are held on-device before DataViewer export.

Limitations & known gaps

  • Only the wide absorbance CSV export is fixture-backed; the reflectance and derivative export modes and the native on-device format are not yet validated.

  • The generic reader types the signal as absorbance from the wide-header layout; it does not read the DataViewer “export mode” to distinguish reflectance vs absorbance vs derivative.

Reference readers

Generic CSV tooling (pandas, read.table); no dedicated reference reader.

Samples & validation

samples/felix_f750/mango_dmc_f750_slice.csv is golden-backed in crates/nirs4all-formats/tests/goldens/ (csv_felix_f750_mango_slice, 26 records, 306-point nm axis, 285-1200 nm). It is a CC-BY-4.0 slice of the Mango DMC dataset (Anderson, Walsh & Subedi 2020, Mendeley 10.17632/46htwnp833.1).