The optical spectrometer is a widely established and used scientific instrument for analyzing biochemical samples. However, it expensive, bulky, requires an external power source computer to operate, which makes difficult use in resource-limited countries remote locations. Advancement smartphone technology has led the development of portable, low-cost smartphone-based spectrometers. lack software automatic wavelength calibration results irrelevant workloads students within time limit course....

In this paper, automatic fever screening system is proposed and experimentally implemented using an IR camera a mobile phone. Our locates position of patients automatically face detection algorithm on RGB image obtains temperature from at detected location. Advantages are fast, portable, non-contacting simultaneously measurement. Furthermore, allows the to track patient's position. Hence, robust measurement can be properly done even not stand still. has been field-tested measure screen ill...

A digitally controlled multiwavelength variable fiber-optic attenuator using a two-dimensional digital micromirror device (DMD) is introduced. The results from an experimental four-wavelength (i.e., 1546.92, 1548.52, 1550.12, and 1551.72 nm) proof-of-concept indicate 26-dB dynamic range 11-bit resolution. measured average coherent optical cross talk per wavelength channel -38 dB , limited by the additive noise resulting nonideal isolation of circulator module. loss for our 15 mainly...

An optical beam profiler is introduced that uses a two-dimensional (2-D) small-tilt micromirror device. Its key features include fast speed, digital control, low polarization sensitivity, and wavelength independence. The use of this 2-D multipixel device opens up the important possibility realizing several profile measurement concepts, such as moving knife edge, scanning slit, pinhole, variable aperture, photodiode array. experimental proof concept using to simulate edge indicates small...

As the color level of rice leaf corresponds to nitrogen status in field, farmers use a chart (LCC) identify order estimate amount N fertilizer needed for field. However, ability and degeneration LCC affect accuracy reading level. In this paper, we propose mobile device-based analyzer called "BaiKhao" (means Thai). Our key idea is simultaneously capture process two-dimensional (2-D) data scattered reflected from its surrounding reference, thus eliminating expensive external components...

Nowadays, body temperature screening is very important especially in the current global coronavirus disease (COVID-19) epidemic. It can be considered as first step monitoring fever symptom if checked regularly. Aiming at alleviating influence of working distance and ambient disturbance, this article proposes demonstrates a self-compensation technique that built into our low-cost thermal imaging-based system. The key idea relies on combination 3-D depth sensor, an electronic reference for...

This paper proposes and experimentally demonstrates for what is believed to be the first time a highly sought-after optical structure highly-accurate identification of silkworm pupa gender. The key idea exploit long wavelength beam in red or near infrared spectrum that can effectively safely penetrate body pupa. Later on, simple image processing operations via thresholding, blob filtering, inversion processes are applied order eliminate unwanted noises at same highlight gender gland....

We propose and experimentally demonstrate a hyperspectral imaging-based optical structure for verifying credit card. Our key idea comes from the fact that fine detail of embossed hologram stamped on card is hard to duplicate, therefore its color features can be used distinguishing between real counterfeit ones. As diffractive element, we shine number broadband light sources one at time, each different incident angle, in such way spectra per angle beam are diffracted separated space. In this...

The amount of light is an important issue in several scenarios ranging from scenic design, pollution study, illumination engineering, and agriculture. It typically determined by using a portable digital or lux meter. By realizing that the proliferation cell phones currently tremendous, this paper proposes for first time low-cost phone based Our innovative idea comes fact camera built into functioned as two-dimensional sensitive device captured image can be made diffuse. In way, diffused...

In this article, we establish blood stain detection criteria that are less substrate dependent for use in a liquid crystal tunable filter-based multispectral-imaging system. Kubelka–Munk (KM) theory is applied to transform the acquired stains' reflectance spectra into spectra. Chosen spectral parameters extracted from KM absorbance of several samples on substrates. Blood discrimination based upon those then established empirical data, tested, and refined. our newly invented method, instead...

Some green fruits do not change their color from to yellow when being ripe. As a result, ripeness estimation via and fluorescent analytical approaches cannot be applied. In this article, we propose show for the first time how thermal imaging camera can used two-dimensionally classify into different levels. Our key idea relies on fact that mature have higher heat capacity than immature ones therefore in surface temperature overtime is slower. experimental proof of concept using shows...

The need of mobile microscope is escalating as well the demand high quality optical components in low price. We report here a novel needle moving technique to fabricate milli-size lens together with thermal assist moldless method. Our proposed protocol able create tensile strength structure and its base which beneficial for exploiting convertinga smart phone be digital microscope. observe that no bubble trapped when this performed can overcome challenge problem found typical dropping...

A single-wavelength spectral-imaging-based Thai jasmine rice breed identification is demonstrated. Our nondestructive approach relies on a combination of fluorescent imaging and simple image processing techniques. Especially, we apply thresholding, blob filtering, subtracting processes to either 545 or 575 nm in order identify our desired from others. Other key advantages include no waste product fast time. In demonstration, UVC light used as exciting light, liquid crystal tunable optical...

This paper shows for the first time how a mobile device such as smart cell phone and tablet can be used to realize highly-sought-after high-resolution digital microscope. Demonstration based on low-cost molded plastic convex lens combined with our design packaging style that portable microscope easily implemented featuring measured high image resolution of >; 4.40 μm field view 5×5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ....