Gas Chromatograph (GC) detector to provide GC measurement in digital form

US11327057B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventor

• Glen Eugene Schmidt · Corvallis, US

Key dates

• Filing date: Oct 28, 2016
• Grant date: May 10, 2022
• Expiry date: Apr 4, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M3/464
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A Gas Chromatograph (GC) detector comprises a first circuit, a second circuit, a digital subtractor and a digital logic shared between one to many detector channels to provide a GC measurement in a digital form. The first circuit includes a first counter circuitry to provide a first counter output. The second circuit includes a second counter circuitry to provide a second counter output. The GC detector includes a digital subtractor to subtract the first counter output from the second counter output and provide a digital subtractor output. The GC detector further includes a digital logic shared between one to many detector channels to implement at least a portion of the first counter circuitry and the second counter circuitry. The digital logic to receive the digital subtractor output and provides the GC measurement in the digital form. The GC detector may be based on a Thermal Conductivity Detector (TCD) in which an integrator of a Sigma-Delta (Σ-Δ) A/D converter is eliminated and the Σ factor of the Sigma-Delta (Σ-Δ) A/D converter is accomplished in a digital form.