  In this work we present the design and characterization of a dual comb
photoacoustic spectroscopy (DCPAS) set-up for ammonia detection in the near
infrared. The system consists of a dual electro-optic (EO) comb generator that
generates a multiheterodyne beating signal in the gas sample. The input to the
dual EO comb generator is a laser diode tuned to a fixed wavelength within an
absorption feature of ammonia (around 1531.6 nm, 6529 cm-1) and we show how the
dual comb allows to perform PAS measurements and resolve the absorption
features with high spectral resolution. We present results of the ammonia
absorption line profile reconstruction with a bandwidth of 1 cm-1 and a
resolution of 0.08 cm-1. Moreover, we show that dual comb technique based on
electro-optic generation maximally simplifies the optimization of the
multiheterodyne signal according the characteristic of the photoacoustic
detection module. We present results using a resonant gas cell (pipe shape) and
we show how easily the dual comb optical source is adjusted to generate
multiherodyne beating tones within the band of resonance of the gas cell.
