Optical readout photomechanical imager: from design to implementation

Erdtmann, M.; Zhang, L.; Jin, Guanghai; Radhakrishnan, Shankar; Simelgor, Gregory; Salerno, J. P.

doi:10.1117/12.818815

Cited by 11 publications

(17 citation statements)

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“…The time multiplexing scheme, where only a single camera is required, can be implemented using various methods, such as time-multiplexed and synchronized intensity modulation and the capture of both sources or by placing a rotating optical filter before the CCD plane. Besides the optical hardware requirements listed in Table 1, the integration of the readout electronics card around a low cost complementary metal-oxide-semiconductor/CCD sensor unit is also required in practice for processing the output signal into a video output format using a digital signal image processor [18]. After the calibration procedure, the sensitivity map of the array for both wavelengths can be stored in dedicated memories, which can serve as a guideline in wavelength selection for individual sensors.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Sensitivity enhancement of grating interferometer based two-dimensional sensor arrays using two-wavelength readout

Ferhanoğlu

Ürey

2011

Appl. Opt.

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Diffraction gratings integrated with microelectromechanical systems (MEMS) sensors offer displacement measurements with subnanometer sensitivity. However, the sensitivity of the interferometric readout may drop significantly based on the gap between the grating and the reference surface. A two-wavelength (2-λ) readout method was previously tested using a single MEMS sensor for illustrating increased displacement measurement capability. This work demonstrates sensitivity enhancement on a sensor array with large scale parallelization (~20,000 sensors). The statistical representation, which is developed to model sensitivity enhancement within a grating based sensor array, is supported by experimental results using a thermal sensor array. In the experiments, two lasers at different wavelengths (633 and 650 nm) illuminate the thermal sensor array from the backside, time-sequentially. The diffracted first order light from the array is imaged onto a single CCD camera. The target scene is reconstructed by observing the change in the first diffracted order diffraction intensity for both wavelengths. Merging of the data from two measurements with two lasers was performed by taking the larger of the two CCD measurements with respect to the reference image for each sensor. ~30% increase in the average sensitivity was demonstrated for a 160×120 pixel IR sensor array. Proposed architecture is also applicable to a variety of sensing applications, such as parallel biosensing and atomic force microscopy, for improved displacement measurements and enhanced sensitivity.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Sensitivity enhancement of grating interferometer based two-dimensional sensor arrays using two-wavelength readout

Ferhanoğlu

Ürey

2011

Appl. Opt.

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“…There are two kinds of methods that are widely used: pin-hole method and knife-edge filter method. In 2001, Tohru Ishizuya et al from the Nikon Corporation manufactured a 55μm × 55μm detection array on a silicon substrate, after the image processing, an image of a person can be clearly observed at room temperature, and the NETD value can reach 1-2K [4,5]. However, the high-frequency part of the FPA spectrum is occlusion, only the middle of a small part of the low frequency of the light through, so would cause the loss of non-uniform image and image details.…”

Section: Introductionmentioning

confidence: 98%

An optical readout method based on reflective filter for infrared imaging system

et al. 2012

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The uncooled optical readout infrared imaging system altering the infrared image directly into a visible image is becoming a hotspot of research recent years. How to reduce the volume and improve the quality of infrared imaging is a key problem of the optical readout infrared thermal imaging system. In this paper, an reflective readout method of infrared imaging systems is presented, by which reduce the volume of the system for about 30%, improve the uniformity of the infrared image, the minimum detectable angle can be decreased by 1.3×10 -5 deg than knife-edge filter method. The result of experiment is basically consistent with the theory analysis, experimental results indicate that the NETD of this system can be reach 173mK. Compared with traditional methods, the reflective optical readout method can effectively improve image quality.

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“…Micromechanical uncooled infra-red (IR) image sensors for long wave infrared radiation (8-14μm) with optical readout have been intensively studied lately [1][2][3][4][5][6]. They are developed as an alternative to industrially produced, but yet rather expensive micro-bolometer IR detectors [7].…”

Section: Introductionmentioning

confidence: 99%

Performance Limit of Infra-Red Thermomechanical Imager with Optical Readout

Fedirko¹,

Fetisov²,

Svidzinsky³

2014

ujas

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We analyze the performance limit of uncooled thermo-mechanical infra-red imagers with optical readout. We have shown that for large enough frame format thermal noise of load resistance of output electronic cascade of optical readout system determines mainly the noise equivalent temperature difference, NETD, of such systems. For middle frame format they can successfully compete with micro-bolometer infra-red detectors. Higher power low noise light source for optical readout system and more exquisite phase detection enable them to be competitive in large frame format too.

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Optical readout photomechanical imager: from design to implementation

Cited by 11 publications

References 0 publications

Sensitivity enhancement of grating interferometer based two-dimensional sensor arrays using two-wavelength readout

Sensitivity enhancement of grating interferometer based two-dimensional sensor arrays using two-wavelength readout

An optical readout method based on reflective filter for infrared imaging system

Performance Limit of Infra-Red Thermomechanical Imager with Optical Readout

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