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地震檢波器假頻檢測的方法

  方法介紹:

地震檢波器假頻檢測的方法包括:將標準加速度傳感器與被測地震檢波器同時固定在振動臺上,并使兩傳感器的軸向和振動臺的主振方向垂直;采集標準加速度傳感器和被測地震檢波器的輸出電壓波形,并計算得到由于振動臺橫向振動引起的檢波器輸出電壓波形;用被測地震檢波器的實際輸出電壓波形減去由于振動臺橫向振動引起的輸出電壓波形,計算其幅值后,再除以當前時刻振動臺主振方向的速度幅值,所得的商為被測地震檢波器的橫向靈敏度;由低頻到高頻逐點激勵地震檢波器,得到橫向幅頻特性曲線,曲線的峰值對應的頻點即為被測地震檢波器的假頻。本發明具有能夠利用普通振動臺即可******測得地震檢波器假頻的優點。 

  方法:
  假頻測試可以應用如下檢波器:

Type

LGT-20D4.5

LGT-20D10

LGT-20D14

LGT-20D28

Natural Frequency (Hz)

4.5 ± 0.5

10 ± 5%

14 ± 5%

28 ± 5%

Open Circuit Damping

0.6 ± 5%

0.3 ± 5%

0.22 ± 5%

0.27 ± 5%

Damping with Shunt Resistance

 

0.7 ± 5%

0.51 ± 5%

0.552 ± 5%

Intrinsic Voltage Sensitivity (V/cm/s)

0.288± 5%

0.28 ± 5%

0.28 ± 5%

0.39 ± 5%

Sensitivity with Shunt Resistance(V/cm/s)

 

0.2 ± 5%

0.2 ± 5%

0.28 ± 5%

Coil Resistance

375 ± 5%

395 ± 5%

395 ± 5%

395 ± 5%

Close Circuit Resistance (Ω)

 

283 ± 5%

283 ± 5%

283 ± 5%

Harmonic Distortion 

≤0.6%

≤0.2%

≤0.2%

≤0.2%

Typical Spurious Frequency (Hz)

≥150

≥250

≥250

≥350

Moving Mass (g)

11.3

11

11

11

Coil Excursion P-P

4.0

1.5

1.5

1.5

Maintains Fn Specifications to Tilt Angle 

≤10

≤20

≤20

90

Core Unit Diameter (mm)

25.4

25.4

25.4

27

Core Unit Height (mm)

36

33.5

33.5

33.5

Core Unit Mass (g)

81

87

87

100

Operating Temperature()

-40 to +90

-40 to +90

-40 to +90

-40 to +90

Warranty (year)

1

3

3

3

 

Type

LGT-20D40

LGT-20D60

LGT-20D100

Natural Frequency(Hz)

40 ± 5%

60±5%

100 ± 5%

Open Circuit Damping

0.37 ± 5%

0.503±5%

0.464 ± 5%

Damping with Shunt Resistance

0.576 ± 5%

0.60±5%

0.65 ± 5% (1500 Ω)

Intrinsic Voltage Sensitivity(V/cm/s)

0.42 ± 5%

0.39±5%

0.612 ± 5%

Sensitivity with Shunt Resistance (V/cm/s)

0.304 ± 5% (1500)

0.27±5% (2000)

0.32 ± 5% (1500 Ω)

Close Circuit Resistance (Ω)

 

 

 

Coil Resistance (Ω)

575 ± 5%

668±5%

808± 5% 

Distortion (%)

≤0.2

0.2

0.2

Typical Spurious Frequency (Hz)

≥400

 ≥550

≥ 600

Moving Mass (g)

8.2

6.5

7.6

Coil Excursion P-P (mm)

1.5

1.5

1.5

Maintains Fn Specifications to Tilt Angle

90

90°

90°

Core Unit Diameter (mm)

27

27

27

Core Unit Height (mm, )

33.5

33.5

33.5

Core Unit Mass (g)

100

98

98

Operating Temperature()

-40 to +90

-40 to +90

-40 to +90

Warranty(year)

3

2

2

 

*Longet Equipment Co., Ltd can customize different kind of seismic geophones to meet all the customer's various applications.

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