Stories from the Field,Fundamental Questions and Solutions - Measurement While Drilling Signal Analysis, Optimization and Design - page 37

Figure 1.5.o.1. Chinese fireworks.
Figure 1.5o.2. Artificial low frequency “mud pump” noise.
Comments: During one test session, a vendor failed to deliver our “mud
pump emulator” on time. Improvising was key to obtaining qualitative data.
Chinese firecrackers will produce strong plane waves at approximately once per
second. These were constrained in the wind tunnel and ignited as needed.
Figure 1.5p.1. Lead author tests wind effects at the outlet.
Figure 1.5p.2. Volume flow sensor at long wind tunnel outlet
characterizes frequency or wavelength-dependent effects.