Phase-sensitive method for background-compensated photoacoustic detection of NO_2 using high-power LEDs

Saarela, Jaakko; Sorvajärvi, Tapio; Laurila, Toni; Toivonen, Juha

doi:10.1364/oe.19.00a725

Cited by 31 publications

(31 citation statements)

References 22 publications

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“…Figure 55. Differential microphone arrangement of Saarela et al, after [337]. The dashed line corresponds to the amplitude of standing pressure waves in the cell.…”

Section: Photoacoustic Detectionmentioning

confidence: 99%

Optical gas sensing: a review

Hodgkinson

Tatam

2012

Meas. Sci. Technol.

1,356

858

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The detection and measurement of gas concentrations using the characteristic optical absorption of the gas species is important for both understanding and monitoring a variety of phenomena from industrial processes to environmental change. This article reviews the field, covering several individual gas detection techniques including non-dispersive infrared (NDIR), spectrophotometry, tunable diode laser spectroscopy and photoacoustic spectroscopy. We present the basis for each technique, recent developments in methods and performance limitations. The technology available to support this field, in terms of key components such as light sources and gas cells, has advanced rapidly in recent years and we discuss these new developments. Finally, we present a performance comparison of different techniques, taking data reported over the preceding decade, and draw conclusions from this benchmarking.

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“…Figure 55. Differential microphone arrangement of Saarela et al, after [337]. The dashed line corresponds to the amplitude of standing pressure waves in the cell.…”

Section: Photoacoustic Detectionmentioning

confidence: 99%

Optical gas sensing: a review

Hodgkinson

Tatam

2012

Meas. Sci. Technol.

1,356

858

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“…Also, by using a proper designed resonant PA cell a much higher SNR is expected. For this many different approached has been demonstrated aiming at various aspects of SNR [5,8,11]. The presented proof-of-concept experiment demonstrates that the fiber cantilever has potential as a compact and robust sound transducer for PA sensing of various trace gasses.…”

Section: Discussionmentioning

confidence: 97%

All-optical detection of acoustic pressure waves with applications in photoacoustic spectroscopy

Westergaard¹,

Lassen²

2016

Appl. Opt.

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An all-optical detection method for the detection of acoustic pressure waves is demonstrated. The detection system is based on a stripped (bare) single-mode fiber. The fiber vibrates as a standard cantilever and the optical output from the fiber is imaged to a displacement-sensitive optical detector. The absence of a conventional microphone makes the demonstrated system less susceptible to the effects that a hazardous environment might have on the sensor. The sensor is also useful for measurements in high temperature (above 200• C) environments where conventional microphones will not operate. The proof-of-concept of the all-optical detection method is demonstrated by detecting sound waves generated by the photo-acoustic effect of NO2 excited by a 455 nm LED, where a detection sensitivity of approximately 50 ppm was achieved.

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“…Since the PA signal is directly proportional to the excitation power, already available more powerful QCLs would increase the sensitivity. Furthermore, electromechanical film microphone stacks at both ends of the resonator can be used to further improve acoustic detection due to a larger size microphone and a differential detection [20,21].…”

Section: Discussion and Outlookmentioning

confidence: 99%

Versatile multipass cell for laser spectroscopic trace gas analysis

et al. 2012

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The design, construction and characterization of a novel circular multipass cell for sensitive trace gas analysis are presented. This cell allows for easy modification of the optical path length without any changes of its physical parameters. Furthermore, it is suited for three different detection techniques: direct absorption, wavelength modulation and photoacoustics. To demonstrate its performance, mixing ratios of 13 CO 2 and N 2 O were measured from ambient air, using a quantum cascade laser. With the direct absorption method, noise equivalent 1-s precisions of 2.7 ppb and 0.2 ppb are achieved for 13 CO 2 and N 2 O, respectively. The wavelength modulation technique resulted in 4.3 ppb precision with 1-s averaging for the 13 CO 2 measurements. A Q-factor of 190 and a normalized noise equivalent minimum absorption of 1.3 × 10 −8 cm −1 W Hz −1/2 are achieved using the photoacoustic technique.A. Manninen ( ) · B. Tuzson · L. Emmenegger

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Phase-sensitive method for background-compensated photoacoustic detection of NO_2 using high-power LEDs

Cited by 31 publications

References 22 publications

Optical gas sensing: a review

Optical gas sensing: a review

All-optical detection of acoustic pressure waves with applications in photoacoustic spectroscopy

Versatile multipass cell for laser spectroscopic trace gas analysis

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