title: Characterization of modulated time-of-flight range image sensors

authors: Payne, Andrew D.

subjects: 3D imaging

abstract: A number of full field image sensors have been developed that are capable of simultaneously measuring intensity and distance (range) for every pixel in a given scene using an indirect time-of-flight measurement technique. A light source is intensity modulated at a frequency between 10–100 MHz, and an image sensor is modulated at the same frequency, synchronously sampling light reflected from objects in the scene (homodyne detection). The time of flight is manifested as a phase shift in the illumination modulation envelope, which can be determined from the sampled data simultaneously for each pixel in the scene. This paper presents a method of characterizing the high frequency modulation response of these image sensors, using a pico-second laser pulser. The characterization results allow the optimal operating parameters, such as the modulation frequency, to be identified in order to maximize the range measurement precision for a given sensor. A number of potential sources of error exist when using these sensors, including deficiencies in the modulation waveform shape, duty cycle, or phase, resulting in contamination of the resultant range data. From the characterization data these parameters can be identified and compensated for by modifying the sensor hardware or through post processing of the acquired range measurements.

text: Characterization of modulated time-of-flight range image sensors A number of full field image sensors have been developed that are capable of simultaneously measuring intensity and distance (range) for every pixel in a given scene using an indirect time-of-flight measurement technique. A light source is intensity modulated at a frequency between 10–100 MHz, and an image sensor is modulated at the same frequency, synchronously sampling light reflected from objects in the scene (homodyne detection). The time of flight is manifested as a phase shift in the illumination modulation envelope, which can be determined from the sampled data simultaneously for each pixel in the scene. This paper presents a method of characterizing the high frequency modulation response of these image sensors, using a pico-second laser pulser. The characterization results allow the optimal operating parameters, such as the modulation frequency, to be identified in order to maximize the range measurement precision for a given sensor. A number of potential sources of error exist when using these sensors, including deficiencies in the modulation waveform shape, duty cycle, or phase, resulting in contamination of the resultant range data. From the characterization data these parameters can be identified and compensated for by modifying the sensor hardware or through post processing of the acquired range measurements.

year: 2009

title: Students' perceptual change of professional ethics after engaging in work-integrated learning

authors: Zegwaard, Karsten E.

abstract: When students undertake work placements, they become immersed in a relevant community of practice, where they are required to meet the social demands to perform within the norms of this community. These expected norms are shaped by several community aspects, such as cultural beliefs, ethical considerations, and moral positions. The workplace experiences are also where students start to shape and understand their own identity as a professional and their professional morality and ethics. With increasing industry demands for work-ready graduates (Archer & Davison, 2008; Lomax-Smith, Watson, & Webster, 2011), there needs to be consideration that ‘work-readiness’ includes professional identity and professional ethics. Identity development is strongly related to how a student engages with professional work-life (Reid, Dahlgren, Peticz, & Dahlgren, 2008). Perhaps not surprising then that increasingly values education, enhancing ethical knowledge and conduct, and professional identity development are being seen as important facets of student development (Campbell & Zegwaard, 2011a; Herkert, 2000; Keown, Parker, & Tiakiwai, 2005; Trede, Macklin, & Bridges, 2011). However, students engaged in undergraduate studies, tend to hold narrow conceptualisations of professionalism (Grace & Trede, 2011). The literature argues that to have effective development of professional ethical awareness and practice, then explicit emphasis must be placed in the curriculum on the learning and development of professional identity and professional ethics (Campbell & Zegwaard, 2011b; Trede, 2012).

text: Students' perceptual change of professional ethics after engaging in work-integrated learning When students undertake work placements, they become immersed in a relevant community of practice, where they are required to meet the social demands to perform within the norms of this community. These expected norms are shaped by several community aspects, such as cultural beliefs, ethical considerations, and moral positions. The workplace experiences are also where students start to shape and understand their own identity as a professional and their professional morality and ethics. With increasing industry demands for work-ready graduates (Archer & Davison, 2008; Lomax-Smith, Watson, & Webster, 2011), there needs to be consideration that ‘work-readiness’ includes professional identity and professional ethics. Identity development is strongly related to how a student engages with professional work-life (Reid, Dahlgren, Peticz, & Dahlgren, 2008). Perhaps not surprising then that increasingly values education, enhancing ethical knowledge and conduct, and professional identity development are being seen as important facets of student development (Campbell & Zegwaard, 2011a; Herkert, 2000; Keown, Parker, & Tiakiwai, 2005; Trede, Macklin, & Bridges, 2011). However, students engaged in undergraduate studies, tend to hold narrow conceptualisations of professionalism (Grace & Trede, 2011). The literature argues that to have effective development of professional ethical awareness and practice, then explicit emphasis must be placed in the curriculum on the learning and development of professional identity and professional ethics (Campbell & Zegwaard, 2011b; Trede, 2012).

year: 2014

title: Sharing the basket: Delivery options for Te Mātāpunenga

authors: Rumbles, Wayne

subjects: law

abstract: This chapter explores some of the options to achieve delivery of Te Mātāpunenga to these end users and briefly identifies some issues to be considered. Te Mātāpunenga has had a long gestation and has been the topic of discussion in some form or other at nearly every Advisory Panel meeting of Te Mātāhauariki Research Institute. Many of those discussions centred on the people who were going to use the material and how it was to be delivered.

text: Sharing the basket: Delivery options for Te Mātāpunenga This chapter explores some of the options to achieve delivery of Te Mātāpunenga to these end users and briefly identifies some issues to be considered. Te Mātāpunenga has had a long gestation and has been the topic of discussion in some form or other at nearly every Advisory Panel meeting of Te Mātāhauariki Research Institute. Many of those discussions centred on the people who were going to use the material and how it was to be delivered.

year: 2010