Temperature Measurements by Wavelength Modulation Diode Laser Absorption Spectroscopy with Logarithmic Conversion and 1f Signal Detection

Liger, V. V.; Mironenko, V. R.; Kuritsyn, Yu. A.; Bolshov, M.A.

doi:10.3390/s23020622

Cited by 4 publications

(4 citation statements)

References 36 publications

(44 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The average measurements for the right laser were found to be 652.4 nm, while for the left laser, it was 653.23 nm. These measurements were influenced by factors such as room lighting, the precision of laser diode placement, and the measuring instrument used [20] [22]. It is worth noting that the specifications of laser diodes available in the market can vary, resulting in slight differences in wavelength, such as 2.4 nm for the right laser and 3.23 nm for the left laser.…”

Section: Methodsmentioning

confidence: 99%

Rhinitis phototherapy prototype with timer based on light energy

Loniza,

Junita,

Jusman

et al. 2024

IJEECS

View full text Add to dashboard Cite

The set of timers in using phototherapy is major problem which has to be resolved to get a good performance of rhinitis phototherapy. This research aims to develop a prototype of phototherapy for allergic rhinitis, incorporating a timer based on light energy. The prototype utilizes a laser diode as a visible light source, specifically with a wavelength of 650 nm. The recommended safe and effective dose of light energy ranges from 1 to 10 Joules, which has been converted into minutes. Measurement tests indicate an average wavelength of 652.40 nm for the right laser, with a measurement uncertainty of ±0.11, and 653.23 nm for the left laser, with a measurement uncertainty of ±0.05. The laser diode source has an average voltage of 1.91 volts and an average current of 1.89 milliamperes, with a measurement uncertainty of ±0.00 and ±0.01, respectively. Additionally, the average discrepancy in the timer is 0.082 minutes for the 10-minute setting and 0.082 minutes for the 20-minute setting. These results confirm the effectiveness and suitability of the developed tool for practical use. The proposed method was useful for rhinitis therapy by using light energy.

show abstract

Section: Methodsmentioning

confidence: 99%

Rhinitis phototherapy prototype with timer based on light energy

Loniza,

Junita,

Jusman

et al. 2024

IJEECS

View full text Add to dashboard Cite

show abstract

“…Photoelectric detection completes the detection of the outgoing laser from the gas chamber so that the optical signal containing the concentration information of the gas to be measured is converted into an electrical signal. After pre-amplification, the required frequency [22] is selectively extracted by the phase-locked amplifier, and the data is processed on the microprocessor to calculate the concentration value of the gas to be measured. In order to study the influence of temperature change on concentration detection results, an incubator was used to simulate ambient temperature change.…”

Section: Construction Of Methane Concentration Measurement Systemmentioning

confidence: 99%

“…The concentration before correction is N 𝑚𝑒𝑎 and N CH 4 is the corrected methane concentration, then the empirical formula of methane temperature correction is shown in Equation (22).…”

Section: The Effect Of Ambient Temperature Change On Measurementmentioning

confidence: 99%

“…The methane concentration data measured at different temperatures were substituted into Equation (22) for correction, and the experimental results with temperature correction were drawn as Figure 12. By comparing the experimental results of methane gas with a 1000 ppm concentration in Figure 11a, it can be seen that the influence of external temperature on test results can be effectively reduced after adding temperature correction.…”

Section: The Effect Of Ambient Temperature Change On Measurementmentioning

confidence: 99%

See 1 more Smart Citation

Temperature Compensation Algorithm of Air Quality Monitoring Equipment Based on TDLAS

Wang

2023

Mathematics

View full text Add to dashboard Cite

When tunable diode laser absorption spectroscopy is used to measure the concentration of gas, the second harmonic signal of demodulation is changed due to the influence of temperature change, and the error in concentration measurement is great. In order to solve the problem of large errors in atmospheric quality monitoring equipment due to the change in gas temperature, this paper, based on the tunable semiconductor laser absorption spectroscopy (TDLAS) theory, measured methane gas with 1000 ppm standard gas as the target and selected the central absorption wavelength of 1650 nm. The influence of temperature change on gas injection and the laser absorption spectrometer is studied. A temperature compensation algorithm based on an empirical formula is designed. Firstly, by analyzing the variable temperature test data of the detection module, it is proposed to divide the influence factors of temperature into two parts and study the influence of injection gas temperature and detector temperature, respectively. Secondly, the temperature compensation is carried out by polynomial fitting the concentration inversion results. Finally, according to the compensation effect, a scheme was proposed to compensate the measured gas by applying a constant temperature treatment to the detector at 313 K. After compensation, the average error of the system measurement is reduced from 8.4% to 1.08% when the gas temperature changes from 233 K to 343 K, which effectively reduces the deviation of the measured value caused by the abrupt temperature change. It further improves the accuracy and reliability of measuring gas concentration when gas inspection equipment is working outdoors and has strong practicability.

show abstract

Tunable Diode Lasers for Analytics and Diagnostics

Bolshov,

Kuritsyn,

Liger

et al. 2023

J Anal Chem

View full text Add to dashboard Cite

Continuous-wave diode lasers (DLs) with tunable emission wavelengths have become extensively used in various fields of analytical spectroscopy and diagnostics. Working in the near and mid-IR spectral region, tunable diode lasers are particularly effective in detecting simple molecules, making them invaluable for environmental monitoring, industrial process control, and diagnostics of subsonic and supersonic gas flows. However, the lack of commercial diode lasers operating in the spectral region shorter than 400 nm has restricted their applicability to elemental analysis, as many resonance lines of free atoms of elements lie in the region 250–400 nm. This review aims to highlight various applications of continuous diode lasers, which are lesser-known to analytical chemists. We briefly overview their main characteristics and discuss their advantages, enabling their successful implementation in traditional analytical spectroscopy tasks, as well as for diagnosing parameters of remote gas objects, including combustion processes in mixing gas flows.

show abstract

Temperature Measurements by Wavelength Modulation Diode Laser Absorption Spectroscopy with Logarithmic Conversion and 1f Signal Detection

Cited by 4 publications

References 36 publications

Rhinitis phototherapy prototype with timer based on light energy

Rhinitis phototherapy prototype with timer based on light energy

Temperature Compensation Algorithm of Air Quality Monitoring Equipment Based on TDLAS

Tunable Diode Lasers for Analytics and Diagnostics

Contact Info

Product

Resources

About