The suitability of a fast, short range time-of-flight distance sensor for industrial applications... more The suitability of a fast, short range time-of-flight distance sensor for industrial applications is considered. Critical characteristics of the sensor are evaluated and compared to those of other type of sensors. Results obtained with a few experimental devices are given. At a range of a few meters the speed of measurement can be up to 2.106 measurements/s with a single pulse resolution of the order of 10 mm. Using averaging the resolution can be improved down to the level of about 100 pm. An example of the design of a fast, short range time-of-flight distance sensor is given. The sensor described is designed to be used at short ranges (<5 m) for passive targets mainly in 3D image acquisition applications. The construction described gives a good concept of the technique needed and its suitability for industrial use.
Papermaking furnish properties were studied in terms of the light scattering caused by fines and ... more Papermaking furnish properties were studied in terms of the light scattering caused by fines and fibres. Scattering produces a retardation in the transit time of laser pulses from a device developed for time-of-flight range finding. The transit time delay in pulp with a consistency of 0.5-0.8% was double or triple that in pure water and was proportional to the fines content. The repeatability error of the measurement system was demonstrated to be less than 10% of the retardation caused by the fines. Both chemical pulp and TMP containing wood fines or china clay were used in tests.
A current pulse generator is presented which allows a 35 A current amplitude with a rise time of ... more A current pulse generator is presented which allows a 35 A current amplitude with a rise time of 150 ps to be achieved across a low-ohmic load. The generator is based on an avalanche transistor matrix with intrinsic switching synchronisation. The front of the pulse is further sharpened by employing sub-nanosecond diode recovery in the first stage and super-fast switching
This report describes the prototype of a bridge monitoring system based on pulsed TOF (Time-Of-Fl... more This report describes the prototype of a bridge monitoring system based on pulsed TOF (Time-Of-Flight) laser radar technology. The TOF method is based on measuring the time delay between optical pu ...
ABSTRACT A current pulse generator is presented which allows a 35 A current amplitude with a rise... more ABSTRACT A current pulse generator is presented which allows a 35 A current amplitude with a rise time of 150 ps to be achieved. The generator is based on an avalanche transistor matrix. The front of the pulse is further sharpened by employing sub-nanosecond diode recovery and super-fast switching of another diode
2011 Proceedings of the European Solid-State Device Research Conference (ESSDERC), 2011
A time-gated single photon avalanche diode (SPAD) has been designed and fabricated in a standard ... more A time-gated single photon avalanche diode (SPAD) has been designed and fabricated in a standard high voltage 0.35 µm CMOS technology for Raman spectroscopy. The sub-ns time gating window is used to suppress the fluorescence background typical of Raman studies, and also to minimize the dark count rate in order to maximize the signal-to-noise ratio of the Raman signal. The
Proceedings of the 39th Midwest Symposium on Circuits and Systems
ABSTRACT 150 A/10 ns current pulses across a low-ohmic resistive load (1 Ω) were obtained using M... more ABSTRACT 150 A/10 ns current pulses across a low-ohmic resistive load (1 Ω) were obtained using Marx type serial connection of the stages with parallel connection of a few avalanche transistors in each stage. The automatic feedback allows perfect time synchronization of the switching process in all the transistors
Proceedings of the 43rd IEEE Midwest Symposium on Circuits and Systems (Cat.No.CH37144)
ABSTRACT An integrated receiver channel for a pulsed time-of-flight (TOF) laser radar capable of ... more ABSTRACT An integrated receiver channel for a pulsed time-of-flight (TOF) laser radar capable of receiving laser pulses having a width of 30 to 200 ps is described here. The realized semicustom bipolar array IC includes current mode gain control, amplifiers and a timing discriminator. An avalanche photodiode (APD) was used to improve the overall responsivity of the receiver. The single-shot resolution (SSR) of the receiver channel is ±5 ps at best, and the maximum input dynamic range is about 50 dB
An avalanche photodiode (APD) chip and a GHz range differential receiver channel IC were combined... more An avalanche photodiode (APD) chip and a GHz range differential receiver channel IC were combined to a hybrid receiver channel for a pulsed time-of-flight (TOF) laser radar. The IC was realized as a semi-custom bipolar array. It includes current mode gain control, amplifiers and a timing discriminator. The timing accuracy of the receiver is ±6 ps in a range of 40 dB.
Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems, 2003
This paper describes a fibre-optic interrogation device based on a pulsed time-of-flight (TOF) te... more This paper describes a fibre-optic interrogation device based on a pulsed time-of-flight (TOF) technique for the measurement of integral strain. The precision of the measurement system is 100 mum (1 ps) and it has a spatial resolution of less than 0.50 m (5 ns), achieved by the use of ultra-short probe pulses of about 500 ps, a GHz band receiver
The suitability of a fast, short range time-of-flight distance sensor for industrial applications... more The suitability of a fast, short range time-of-flight distance sensor for industrial applications is considered. Critical characteristics of the sensor are evaluated and compared to those of other type of sensors. Results obtained with a few experimental devices are given. At a range of a few meters the speed of measurement can be up to 2.106 measurements/s with a single pulse resolution of the order of 10 mm. Using averaging the resolution can be improved down to the level of about 100 pm. An example of the design of a fast, short range time-of-flight distance sensor is given. The sensor described is designed to be used at short ranges (<5 m) for passive targets mainly in 3D image acquisition applications. The construction described gives a good concept of the technique needed and its suitability for industrial use.
Papermaking furnish properties were studied in terms of the light scattering caused by fines and ... more Papermaking furnish properties were studied in terms of the light scattering caused by fines and fibres. Scattering produces a retardation in the transit time of laser pulses from a device developed for time-of-flight range finding. The transit time delay in pulp with a consistency of 0.5-0.8% was double or triple that in pure water and was proportional to the fines content. The repeatability error of the measurement system was demonstrated to be less than 10% of the retardation caused by the fines. Both chemical pulp and TMP containing wood fines or china clay were used in tests.
A current pulse generator is presented which allows a 35 A current amplitude with a rise time of ... more A current pulse generator is presented which allows a 35 A current amplitude with a rise time of 150 ps to be achieved across a low-ohmic load. The generator is based on an avalanche transistor matrix with intrinsic switching synchronisation. The front of the pulse is further sharpened by employing sub-nanosecond diode recovery in the first stage and super-fast switching
This report describes the prototype of a bridge monitoring system based on pulsed TOF (Time-Of-Fl... more This report describes the prototype of a bridge monitoring system based on pulsed TOF (Time-Of-Flight) laser radar technology. The TOF method is based on measuring the time delay between optical pu ...
ABSTRACT A current pulse generator is presented which allows a 35 A current amplitude with a rise... more ABSTRACT A current pulse generator is presented which allows a 35 A current amplitude with a rise time of 150 ps to be achieved. The generator is based on an avalanche transistor matrix. The front of the pulse is further sharpened by employing sub-nanosecond diode recovery and super-fast switching of another diode
2011 Proceedings of the European Solid-State Device Research Conference (ESSDERC), 2011
A time-gated single photon avalanche diode (SPAD) has been designed and fabricated in a standard ... more A time-gated single photon avalanche diode (SPAD) has been designed and fabricated in a standard high voltage 0.35 µm CMOS technology for Raman spectroscopy. The sub-ns time gating window is used to suppress the fluorescence background typical of Raman studies, and also to minimize the dark count rate in order to maximize the signal-to-noise ratio of the Raman signal. The
Proceedings of the 39th Midwest Symposium on Circuits and Systems
ABSTRACT 150 A/10 ns current pulses across a low-ohmic resistive load (1 Ω) were obtained using M... more ABSTRACT 150 A/10 ns current pulses across a low-ohmic resistive load (1 Ω) were obtained using Marx type serial connection of the stages with parallel connection of a few avalanche transistors in each stage. The automatic feedback allows perfect time synchronization of the switching process in all the transistors
Proceedings of the 43rd IEEE Midwest Symposium on Circuits and Systems (Cat.No.CH37144)
ABSTRACT An integrated receiver channel for a pulsed time-of-flight (TOF) laser radar capable of ... more ABSTRACT An integrated receiver channel for a pulsed time-of-flight (TOF) laser radar capable of receiving laser pulses having a width of 30 to 200 ps is described here. The realized semicustom bipolar array IC includes current mode gain control, amplifiers and a timing discriminator. An avalanche photodiode (APD) was used to improve the overall responsivity of the receiver. The single-shot resolution (SSR) of the receiver channel is ±5 ps at best, and the maximum input dynamic range is about 50 dB
An avalanche photodiode (APD) chip and a GHz range differential receiver channel IC were combined... more An avalanche photodiode (APD) chip and a GHz range differential receiver channel IC were combined to a hybrid receiver channel for a pulsed time-of-flight (TOF) laser radar. The IC was realized as a semi-custom bipolar array. It includes current mode gain control, amplifiers and a timing discriminator. The timing accuracy of the receiver is ±6 ps in a range of 40 dB.
Smart Structures and Materials 2003: Smart Sensor Technology and Measurement Systems, 2003
This paper describes a fibre-optic interrogation device based on a pulsed time-of-flight (TOF) te... more This paper describes a fibre-optic interrogation device based on a pulsed time-of-flight (TOF) technique for the measurement of integral strain. The precision of the measurement system is 100 mum (1 ps) and it has a spatial resolution of less than 0.50 m (5 ns), achieved by the use of ultra-short probe pulses of about 500 ps, a GHz band receiver
Uploads
Papers by Ari J Kilpelä