Abstract: Systems and method for automatically determining offset correction values in a differential measurement system, and for correcting measurement offsets between two measurement devices in the differential measurement system. A method for determining real-time offset corrections in a gas analysis system having first and second gas analyzers includes for each of a plurality of gas concentrations within a range of gas concentrations: a) supplying the concentration of gas to the first and second gas analyzers through first and second gas flow lines, respectively; b) measuring a first gas concentration value using the first gas analyzer; and c) measuring a second gas concentration value using the second gas analyzer. The method may also include determining an offset value between each corresponding first and second gas concentration value, and determining a functional relationship between the offset values and gas concentration measurements of the first gas analyzer.

Abstract: Systems and methods for measuring plant leaf gas exchange based on instantaneous mass balance in the sample chamber. The response of leaf net assimilation rate (Anet) to computed leaf internal CO2 concentration (C1) is measured by continuously varying the input CO2 concentration and measuring the continuous difference between chamber input (reference) and output (sample) concentrations to compute a continuous series of Anet values, which can then be plotted against computed Ci. When combined with a similar response test using an empty chamber test to allow for sample chamber mixing and/or gas analyzer match dynamics and/or small flow-related residual time delays, such method provides accurate and rapid A Ci response (RACiR) curves in a much shorter time than conventional methods.

Abstract: Systems and method for automatically determining offset correction values in a differential measurement system, and for correcting measurement offsets between two measurement devices in the differential measurement system. A method for determining real-time offset corrections in a gas analysis system having first and second gas analyzers includes for each of a plurality of gas concentrations within a range of gas concentrations: a) supplying the concentration of gas to the first and second gas analyzers through first and second gas flow lines, respectively; b) measuring a first gas concentration value using the first gas analyzer; and c) measuring a second gas concentration value using the second gas analyzer. The method may also include determining an offset value between each corresponding first and second gas concentration value, and determining a functional relationship between the offset values and gas concentration measurements of the first gas analyzer.

Abstract: Systems and methods for measuring plant leaf gas exchange based on instantaneous mass balance in the sample chamber. The response of leaf net assimilation rate (Anet) to computed leaf internal CO2 concentration (Ci) is measured by continuously varying the input CO2 concentration and measuring the continuous difference between chamber input (reference) and output (sample) concentrations to compute a continuous series of Anet values, which can then be plotted against computed Ci. When combined with a similar response test using an empty chamber test to allow for sample chamber mixing and/or gas analyzer match dynamics and/or small flow-related residual time delays, such method provides accurate and rapid A Ci response (RACiR) curves in a much shorter time than conventional methods.