Boguslaw Wiecek

Standardization of infrared imaging

To provide an atlas and database for the temperature distribution of the skin in normal human subjects aged from 10 years to 75 years. The technique used in digital infrared thermal imaging which has been in use since 1960. Despite, many different applications and published studies, a normal database is not available. It is particularly needed for forensic and hospital clinic use.

Measurements and simulations of transient characteristics of heat pipes

The rejection of heat generated by components and circuits is a very important aspect in design of electronics systems. Heat pipes are very effective, low cost elements, which can be used in cooling systems. This paper presents the modelling and measurements of the heat and mass transfer in heat pipes. The physical model includes the effects of liquid evaporation and condensation inside the heat pipe. The internal vapour flow was fully simulated using computational fluid dynamics. The theory has been compared with experimental measurements using thermographic camera and contact thermometers. The main purpose of this study is to determine the effective heat pipe thermal conductivity in transient state during start up the pipe operation and temperature increase.

Advanced thermal, visual and radiological image processing for clinical diagnostics

Presents multi-channel system with for advanced image processing for thermal, visual and radiological images. Novel methods mainly based on statistical data processing and 3D reconstruction are implemented. The system was successfully used for pneumonia treatment.

Investigations of Single and Multilayer Structures Using Lock-In Thermography—Possible Applications

This paper presents a study of the possibilities of evaluating thermal parameters of single and multilayer structures using dynamic thermography. It also discusses potential uses of lock-in thermography. It presents a simulation of a periodic excitation of a multilayer composite material. In practice, the described methods can be employed in various applications, for example, in multilayer nonwoven microelectronic components manufactured from hemp fibers, chemical fibers, with an addition of electrically conducting fibers, and in medicine and biology. This paper describes tests conducted with lock-in thermography on carbon fibre reinforced composites with implanted delamination defects. Lock-in thermography is a versatile tool for non-destructive evaluation (NDE). Lock-in thermography is a fast, remote and non-destructive procedure. Hence, it has been used to detect delaminations in the composite structure of aircraft. This method directly contributes to an improvement in safety.

The physical properties of the surface of apparel made from flax and polyester fibres

In this paper, the clothes made of synthetic and natural fibres were tested. The characteristics of selected physical parameters such as temperature, electrical resistance, thermal resistance of fabrics used for tested clothes have been presented. The electrostatical charge and temperature distribution of clothes were investigated on human body. The temperature distribution and the coefficient of heat transmission were measured by a new thermovision method.

Comparison of Fourier and wavelet analyses for defect detection in lock-in and pulse phase thermography

This paper demonstrates how the wavelet analysis can be used as an alternative tool to fast Fourier transform in case of lock-in thermography (giving similar qualitative results) and pulse phase thermography method (where the time information is of consideration) in order to improve its analysis capabilities for the price of higher computational cost. Besides of theoretical information about application of those transforms, for both of them qualitative experimental results are shown. This paper presents the chosen results of experiments realized at the Institute of Electronics, Technical University of Lodz.

Advanced thermal image processing for medical and biological applications

In this paper, new image processing tools are presented for conversion thermal and visual images, mainly for application in medicine and biology. A novel method for area and distance evaluation based on statistical differencing is discussed. In order to increase the measurements accuracy, the interpolation and subpixel bitmap processing are chosen.

Active Thermography in Qualitative Evaluation of Protective Materials

This is a study of the possibilities of a qualitative evaluation of protective materials with active thermography. It presents a simulation of a periodic excitation of a multilayer composite material. Tests were conducted with lock-in thermography on Kevlar® composite consisting of 16 layers of Kevlar® fabric reinforced with formaldehyde resin with implanted delamination defects. Lock-in thermography is a versatile tool for nondestructive evaluation. It is a fast, remote and nondestructive procedure. Hence, it was used to detect delaminations in the composite structure of materials used in the production of components designed for personal protection. This method directly contributes to an improvement in safety.

Thermal drift compensation method for microbolometer thermal cameras

We propose a new method of compensation for drifts in thermal cameras using a filter in place of a shutter. The latter method requires periodically closing the camera, thus causing the images to appear frozen frequently. Our technique of replacing the shutter with a filter eliminates this frozen image problem. In this paper we discuss the principles of the new method and present the obtained results.

Thermography in psoriasis vulgaris evaluation

Psoriasis vulgaris is a chronic inflammatory skin disease with a strong genetic component, characterized by hyperkeratosis, dermal inflammatory infiltrate and increased angiogenesis. The aim of the present study was to employ thermography in evaluation of psoriatic lesions localized in different parts of the body. A series of in-patients with stable plaque type psoriasis vulgaris were included. ThermaCam INFRAMETRICS 290E thermocamera with temperature resolution of 0.1 degC was used in the study. Both visual and thermal images of 84 areas of lesional and lesion-free skin in patients were taken and analyzed. All the skin lesions were divided into 4 groups, according to their location i.e. found on the upper limbs, lower limbs, chest and back. Increased temperature was observed over psoriatic lesions located in the chest and upper limbs. To the contrary, skin lesions located on the back and lower limbs presented lower temperature. It is conceivable to speculate that lower temperature revealed within the lower parts of the body may explain to some extend slower regression of the lesions located in this region in comparison to skin lesions located over the upper parts of the body