5 2011 12 14 Distributed temperature sensor (DTS) technology is used widespreadly among many applications, such as temperature monitoring in plant engineering. The author has developped a novel DTS, capable of bringing a drastical cost-down on DTSs. With the low-costness, DTSs shall be used more universally. In this paper, the theory and some experiments are shown. The potential of DTS that can measure more physical values other than temperature is also discussed. 1 ( DTS) 1 DTS DTS [1] DTS 2 DTS DTS DTS DTS DTS 2 1 ( ) x ρ(x) ( ) ρ(x) l L R = 1 π(r 2 2 r2 1 ) l 0 ρ(x)dx (1) 1
1: DTS r 1, r 2 v ρ(x) = π(r1 2 r2) 2 dr dt 1 v x (2) t=x/v 3 3.1 DTS [2] 7.11352wt% KCl 0 25-1.6%/ 2 3 5wt% NaCl 3wt% ( ) 2 45 NaCl 300Hz 4-1.3%/ [2] DTS DTS 0 [3] 2
2: 3: 3
4: 3.2 DTS DTS DTS 5 6 7 DTS DTS 30cm 10mm DTS DTS DTS 35.9wt% 5wt% 5 200mV 300Hz R t DTS R S 1kΩ ( OR1400) R t, R S AC-RMS ( T-RMS01-1) DTS DTS DTS 2 (20 ) 8 DTS 9 4
5: DTS 6: 5
7: 8: DTS 6
1.2 2.0 DTS 10 9 ( 500 ) 2 9: DTS 10 2 DTS 2 3.3 DTS (R S R t ) DTS 11 12 12 20 7
図 10: 図 9 から得られた温度分布 図 11: 温度センサ表面に感温体を付着させ 凍結させた様子 8
12: ( ) -21.1 12 20 ( ) 12 50 DTS DTS DTS 10 4 4.1 DTS PTC PTC DTS 9
4.2 DTS DTS 1 100 2 100 DTS 0 100kΩ DTS (500 DTS 0 5 ) Ω 1% (500 DTS 495 500 ) 100kΩ 1% 1% 13 R M 13: R t DTS R t V t V t t = V S t R t R t + R M + V SR M R t (R t + R M ) 2 t (3) R t << R M Rt t V t t R M V S (4) R t R t / t R t R, C G = C 1 R 2 t (5) 1 DTS 500m DTS 100 5m 2 DTS 10
R t t R M V out (6) C 1 R 2 V S 4.3 5 DTS 2 DTS DTS 6 [1] p668-688, 2010 [2] p113 58 1985 [3],, 38, p231-236, 1988 [4] OP CQ 1990 11