A Highly Sensitive Detector for Radiation in the Terahertz Region

2007 ◽  
Vol 56 (2) ◽  
pp. 463-467 ◽  
Author(s):  
P. Kleinschmidt ◽  
S.P. Giblin ◽  
V. Antonov ◽  
H. Hashiba ◽  
L. Kulik ◽  
...  
Keyword(s):  
Sensitive Detector ◽  
Terahertz Region ◽  
Highly Sensitive

Challenges Facing Resonant MEMS Sensors

2010 ◽  
Vol 2010 (DPC) ◽  
pp. 001401-001425
Author(s):  
Michael Kranz
Keyword(s):  
Chemical Sensors ◽  
Sensitive Detector ◽  
Quality Factors ◽  
Mems Sensors ◽  
Low Loss ◽  
Rf Filters ◽  
Highly Sensitive ◽  
Differential Operation ◽  
Fabrication Tolerances ◽  
Poor Stability

Many MEMS/NEMS sensors, including gyroscopes, chemical sensors, and RF filters utilize the mechanical resonance of the MEMS/NEMS structure as a highly sensitive detector. Typically, changes in the external environment lead to changes in the resonant frequency or amplitude. Due to the low-loss of micro and nano mechanical structures, large quality factors are achievable, leading to sharp resonance curves that change greatly after only small changes in the environment. This allows sensitive detectors, but also leads to poor stability and tight fabrication tolerances. This paper will discuss these issues as well as mitigation techniques including feedback control, tuning, differential operation, and sensor fusion, amongst others.

scholarly journals Development of a Low-cost and Highly Sensitive Detector of Dew Condensation and Fog Dropping in Protected Horticulture

2007 ◽  
Vol 19 (2) ◽  
pp. 96-100 ◽  
Author(s):  
Takehiko HOSHI ◽  
Keiji SHINTANI ◽  
Yasumasa HAYASHI ◽  
Masuyuki TAKAICHI
Keyword(s):  
Low Cost ◽  
Sensitive Detector ◽  
Highly Sensitive

Highly sensitive detector for submillimeter wavelength range

2004 ◽  
Vol 85 (24) ◽  
pp. 6036-6038 ◽  
Author(s):  
H. Hashiba ◽  
V. Antonov ◽  
L. Kulik ◽  
S. Komiyama ◽  
C. Stanley
Keyword(s):  
Wavelength Range ◽  
Sensitive Detector ◽  
Submillimeter Wavelength ◽  
Highly Sensitive

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

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