17th IEEE International Conference on Micro Electro Mechanical Systems. Maastricht MEMS 2004 Technical Digest, 2004
We present the design, fabrication and characteristics of the first in-plane V-shaped polymer act... more We present the design, fabrication and characteristics of the first in-plane V-shaped polymer actuator. Several different designs are evaluated and compared with each other. The intended application for this actuator is optical component alignment.
A diver uses typically a compass, a depth gauge and a timer for underwater navigation. Especially... more A diver uses typically a compass, a depth gauge and a timer for underwater navigation. Especially when it comes to advanced diving in caves or wrecks, navigation and knowledge about the current position is extremely important, otherwise the diver might not find his way back to the surface and drown as soon as the breathing gas supply is finished. Other approaches are based on ultrasound transmitters that allow simple navigation tasks, however they are useless for applications like cave, wreck or long distance diving. The current paper describes a navigation platform for divers which is based on a handset with a depth sensor and a display, an inertial measurement unit incorporation gyroscopes, accelerometers and magentometers and an interface to attach different kinds of flow sensors for velocity measurement. A first prototype was developed. Additionally a buoy with an integrated GSM/GPS transmitter and a reference system for laboratory measurements can be attached. The prototype was...
Linus Löfgren, phone: +46 (0)31 750 18 22, fax: +46 (0)31 750 18 01, [email protected] A sm... more Linus Löfgren, phone: +46 (0)31 750 18 22, fax: +46 (0)31 750 18 01, [email protected] A small and very low-power polymer-based humidity sensor for wireless applications is presented. The sensor consists of sub-micron interdigitated gold electrodes covered with a humidity-sensitive polyimide layer. Processed sensors have typically an active area of 0.6x0.4mm 2 and a working point at 9 pF with a 1 pF dynamic range for 20-90% RH. Power consumption is in the µW range. The sensors show very good performance having a response speed of 15% RH/s, a sensitivity of typically 15 fF/% RH and almost linear behavior over the entire RH range with less than 4% RH hysteresis.
Wireless sensors incorporated in RFID systems are important in several industrial, consumer and l... more Wireless sensors incorporated in RFID systems are important in several industrial, consumer and logistics applications. By extending RFID tags to sensing applications, the products become smarter. Application areas for these smart tags include; health care (verification of the environmental conditions during transport or in storage of e.g. diapers, bandages, etc.), food monitoring (food quality during transport, storage and sales) and construction industry (e.g. building material).
We present a first contactless pinflange adapter for high-frequency measurements based on gap wav... more We present a first contactless pinflange adapter for high-frequency measurements based on gap waveguide technology. Conventionally, standard (WR) flanges are used, these require good electrical contact and are sensitive to small gaps. The pin-flange adapter has been fabricated and demonstrated for the frequency range 220-325 GHz. It shows similar or better results than a standard flange or a choke flange without requiring electrical contact. The pin-flange adapter has a lower noise level compared to the other flanges, almost 10 dB lower.
Journal of Micromechanics and Microengineering, 2014
ABSTRACT We present the first micromachined double-sided contactless WR03 pin-flange adapter for ... more ABSTRACT We present the first micromachined double-sided contactless WR03 pin-flange adapter for 220–325 GHz based on gap waveguide technology. The pin-flange adapter is used to avoid leakage at the interface of two waveguides even when a gap between them is present and can be fitted onto any standard WR03 waveguide flange. Tolerance measurements were performed with gaps ranging from 30–100 µm. The performance of the micromachined pin flange has been compared to a milled pin flange, a choke flange and to standard waveguide connections. The micromachined pin flange is shown to have better performance than the standard connection and similar performance to the milled pin flange and choke flange. The benefits of micromachining over milling are the possibility to mass produce pin flanges and the better accuracy in the 2D design. Measurements were performed with and without screws fixing the flanges. The flanges have also been applied to measure two devices, a straight rectangular waveguide of 1.01 inch and a ridge gap resonator. In all cases, the micromachined pin flange performed flawlessly while the standard flange experienced significant losses at already small gaps.
17th IEEE International Conference on Micro Electro Mechanical Systems. Maastricht MEMS 2004 Technical Digest, 2004
We present the design, fabrication and characteristics of the first in-plane V-shaped polymer act... more We present the design, fabrication and characteristics of the first in-plane V-shaped polymer actuator. Several different designs are evaluated and compared with each other. The intended application for this actuator is optical component alignment.
A diver uses typically a compass, a depth gauge and a timer for underwater navigation. Especially... more A diver uses typically a compass, a depth gauge and a timer for underwater navigation. Especially when it comes to advanced diving in caves or wrecks, navigation and knowledge about the current position is extremely important, otherwise the diver might not find his way back to the surface and drown as soon as the breathing gas supply is finished. Other approaches are based on ultrasound transmitters that allow simple navigation tasks, however they are useless for applications like cave, wreck or long distance diving. The current paper describes a navigation platform for divers which is based on a handset with a depth sensor and a display, an inertial measurement unit incorporation gyroscopes, accelerometers and magentometers and an interface to attach different kinds of flow sensors for velocity measurement. A first prototype was developed. Additionally a buoy with an integrated GSM/GPS transmitter and a reference system for laboratory measurements can be attached. The prototype was...
Linus Löfgren, phone: +46 (0)31 750 18 22, fax: +46 (0)31 750 18 01, [email protected] A sm... more Linus Löfgren, phone: +46 (0)31 750 18 22, fax: +46 (0)31 750 18 01, [email protected] A small and very low-power polymer-based humidity sensor for wireless applications is presented. The sensor consists of sub-micron interdigitated gold electrodes covered with a humidity-sensitive polyimide layer. Processed sensors have typically an active area of 0.6x0.4mm 2 and a working point at 9 pF with a 1 pF dynamic range for 20-90% RH. Power consumption is in the µW range. The sensors show very good performance having a response speed of 15% RH/s, a sensitivity of typically 15 fF/% RH and almost linear behavior over the entire RH range with less than 4% RH hysteresis.
Wireless sensors incorporated in RFID systems are important in several industrial, consumer and l... more Wireless sensors incorporated in RFID systems are important in several industrial, consumer and logistics applications. By extending RFID tags to sensing applications, the products become smarter. Application areas for these smart tags include; health care (verification of the environmental conditions during transport or in storage of e.g. diapers, bandages, etc.), food monitoring (food quality during transport, storage and sales) and construction industry (e.g. building material).
We present a first contactless pinflange adapter for high-frequency measurements based on gap wav... more We present a first contactless pinflange adapter for high-frequency measurements based on gap waveguide technology. Conventionally, standard (WR) flanges are used, these require good electrical contact and are sensitive to small gaps. The pin-flange adapter has been fabricated and demonstrated for the frequency range 220-325 GHz. It shows similar or better results than a standard flange or a choke flange without requiring electrical contact. The pin-flange adapter has a lower noise level compared to the other flanges, almost 10 dB lower.
Journal of Micromechanics and Microengineering, 2014
ABSTRACT We present the first micromachined double-sided contactless WR03 pin-flange adapter for ... more ABSTRACT We present the first micromachined double-sided contactless WR03 pin-flange adapter for 220–325 GHz based on gap waveguide technology. The pin-flange adapter is used to avoid leakage at the interface of two waveguides even when a gap between them is present and can be fitted onto any standard WR03 waveguide flange. Tolerance measurements were performed with gaps ranging from 30–100 µm. The performance of the micromachined pin flange has been compared to a milled pin flange, a choke flange and to standard waveguide connections. The micromachined pin flange is shown to have better performance than the standard connection and similar performance to the milled pin flange and choke flange. The benefits of micromachining over milling are the possibility to mass produce pin flanges and the better accuracy in the 2D design. Measurements were performed with and without screws fixing the flanges. The flanges have also been applied to measure two devices, a straight rectangular waveguide of 1.01 inch and a ridge gap resonator. In all cases, the micromachined pin flange performed flawlessly while the standard flange experienced significant losses at already small gaps.
Uploads
Papers by S. Haasl