Noncontact temperature measurement of human hand skin using volume phase holographic optical element based digital holographic interferometer

Rastogi, Vivek; Kumar, Varun; Dubey, Swapnil; Khan, Gufran S.; Shakher, Chandra

doi:10.1016/j.optlaseng.2021.106886

Cited by 6 publications

(8 citation statements)

References 52 publications

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“…2(b)) drawn near to skin of index finger in solid blue line. The refractive index variation along the optical path is calculated from the reconstructed unwrapped phase difference profile ∆ϕ(x, y) in the xy plane and can be determined as [19,20]:…”

Section: Temperature Measurement Of Index Fingermentioning

confidence: 99%

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Volume phase holographic grating based digital holographic interferometer for temperature measurement of human hand skin

Rastogi

Kumar²,

Dubey³

et al. 2022

Optical Technology and Measurement for Industrial Applications Conference 2022

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skin temperature provides an important physiological information of human health which plays a vital role in several research and applied applications, particularly in surgery, pediatrics, and general emergency centers [1][2][3]. Human skin temperature is an indicator for disease diagnosis. During the global pandemic COVID-19 produced by the Severe Acute Respiratory Syndrome Corona Virus 2 (SARS-CoV-2) virus [4] measurement of human body temperature has become a primary and critical parameter for identifying potential COVID-19 symptoms. Although in hospitals other patients, physicians, doctors, attendants, nurses, and visitors are the most common sources of cross-infections, the clinical thermometer should not be disregarded. Also, owing to the possibility of patient-topatient or cross-contamination, healthcare personnel are not advised to contact the patient for temperature measurement in order to avoid spreading the virus. Generally, contact-type temperature sensors such as mercury (Hg) in glass or electronic thermometer affixed directly to the underlying skin surface to acquire the temperature. However, the skin-sensor contact, sensor physical size, and sensor pressure limit the accuracy of *

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Section: Temperature Measurement Of Index Fingermentioning

confidence: 99%

“…In equation (5), it is assumed that refractive index is constant along the direction of propagation of laser light. The relationship between temperature distribution T (x, y) and the refractive index distribution n (x, y) can be obtained by combining the Gladstone-Dale (G-D) and the ideal gas equation [19,20].…”

Section: Temperature Measurement Of Index Fingermentioning

confidence: 99%

Volume phase holographic grating based digital holographic interferometer for temperature measurement of human hand skin

Rastogi

Kumar²,

Dubey³

et al. 2022

Optical Technology and Measurement for Industrial Applications Conference 2022

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show abstract

“…In the past, DHI has been extensively used for many applications such as measurement of temperature [49][50][51][52][53][54][55][56][57][58][67][68][69], heat transfer from surface of heated objects [52,54], diffusion coefficient [70,71], flow field analysis [72], observation of decomposition of crude oil under dispersant fluid [73], refractive index of liquids [74], heat conduction in glass [75], solution concentration variation in protein crystallization process [76], visualization of thermal gradients in bulb [77], and human skin temperature [78].…”

Section: Introductionmentioning

confidence: 99%

Applications of Digital Holographic Interferometry in Heat Transfer Measurements from Heated Industrial Objects

Kumar¹,

Shakher²

2023

Holography - Recent Advances and Applications

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Digital holographic interferometry (DHI) is used worldwide for many scientific and industrial applications. In DHI, two digital holograms; one in the reference/ambient state of the object and another in changed state of object are recorded by electronic imaging sensors (such as CCD/CMOS) as reference holograms and object holograms, respectively. Phase of object wavefronts in different states of the object is numerically reconstructed from digital holograms. The interference phase is reconstructed by subtracting the phase of reference hologram from the phase of object hologram, without performing any phase-shifting interferometry. Thus, no extra effort is needed in DHI for calculating the interference phase. Apart from direct reconstruction of interference phase from two digital holograms, the recent development, availability of recording devices at video rate, and high-performance computers make the measurements faster, reliable, robust, and even real-time. In this chapter, DHI is presented for the investigation of temperature distribution and heat transfer parameters such as natural convective heat transfer coefficient and local heat flux around the surface of industrial heated objects such as cylindrical wires and heat sinks.

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“…Comparing the proposed method to earlier ones [13][14][15][16], the calculating procedure is made simpler, increasing computational efficiency. The approach, which does not require the use of challenging mathematical inversions [1,17,18], determines the relationship between phase changes and temperature variations based on the temperature coefficient of the refractive index.…”

Section: Introductionmentioning

confidence: 99%

Digital holography for temperature investigations in space and transparent media

Khodadad,

Tayebi,

Saremi

et al. 2023

Remote Sensing of Clouds and the Atmosphere XXVIII

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The paper presents a method for investigating temperature fields in space and transparent media using off-axis digital holographic interferometry. This interferometric technique is particularly well-suited for measuring dynamically changing temperature fields due to its capability to automatically evaluate temperature from a single interferogram. The experimental validation of this technique involved measuring temperature variations within a burning candle's flame. To establish a reference point, an initial hologram was captured without a burning candle, followed by subsequent holograms during the burning process. This allowed the observation of changing refractive index gradient states in the surrounding air. The reconstruction of the complex amplitude facilitated the calculation of the distribution of phase changes. By establishing a relationship between phase changes, thermal coefficients of the air's refractive index, and temperature fluctuations, temperature measurements were achieved at these distinct states. The accuracy of the measurement was estimated to be less than 1 °C in our experimental setup, showing the high precision achievable with this technique. In summary, the paper offers analysis of digital holographic interferometry as a tool for temperature measurements in transparent media. Its potential applications extend to combustion studies, space exploration, atmospheric research, and various other scientific disciplines.

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Noncontact temperature measurement of human hand skin using volume phase holographic optical element based digital holographic interferometer

Cited by 6 publications

References 52 publications

Volume phase holographic grating based digital holographic interferometer for temperature measurement of human hand skin

Volume phase holographic grating based digital holographic interferometer for temperature measurement of human hand skin

Applications of Digital Holographic Interferometry in Heat Transfer Measurements from Heated Industrial Objects

Digital holography for temperature investigations in space and transparent media

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