Acoustic Emission Preamplifier

SHOCK SENSORS

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Product introduction
Technical parameters
Product accessories
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Shock sensors belong to the category of simple acceleration sensor that is mounted on a printed circuit board. These sensors are used to control vibrations, impacts and movements.

Features

·Very small,light-weight

Low cost

Wide frequency range

Hermetically sealed

Variety of types

Applications and size

For the function of the wrist watch with all kinds
(stop watch, runner watch, turns on light)

Steps counters, Calorie meter

Security sensor

Vibration sensor of the part feeder control equipment

Movement detection of the human body
(game equipment, medical equipment)

Bone conducted voice pickup for earplugs or helmets

Various switch function

Direction of sensitivity

The vibration detection axis is formed by a straight line between the two terminals.

	A(mm)	B(mm)	C(mm)
CR-03R	3	8	10
CR-035BM	3.5	13.5	10

Specifications

Model name	CR-03R　　【RoHS Compliant】	CR-035BM
Weight (Typ.) gm	0.2	0.7
Charge Sensitivity (Typ.) pC/m/s2	( 0.260 )	1.1
Voltage Sensitivity (Typ.) mV/m/s2	0.87	2.5
Mounted Resonant Frequency (Typ.) kHz	9	3.5
Frequency Response Hz3dB * 1	fc1,000	fc1,000
Capacitance (Typ.) pF	300	460
Measurement Range m/s2	5,000	500
Transverse Sensitivity (Max) %	20	20
Insulation Resistance (Min.) M	1,000	1,000
Temperature Range	-10+65	-10+60
Case Material	Nickel silver	Brass *2

* 1 : fc(lower cut off frequency) is determined by capacitance and amp's input impepance
* 2 :Sealed by epoxy

A preamplifier circuit (reference)

A charge amplifier may be used for this piezoelectric accelerometer. However, it is sometimes advantageous to use a voltage amplifier, since it is used for circuit board mounting. Since the vibration detecting feature is configured on the circuit board, the distance between sensor and amplifier circuit is short and constant. For this reason, sensors such as the model CR-03R, in which the voltage sensitivity is higher than the electric charge sensitivity, can be easily applied with a voltage amplifier.

ﾀdVoltage amplifier (example)	Charge amplifier (± terminals)	Charge amplifier (+terminal)

* fc = 1/2Rf•Cf * The OP amplifier can contain an IC for JEET input: Hitachi HA1708D, NEC PC821 or PC831, T.I. TL071 or TL081, etc. (conversion gain in mV/pC = 1000/Cf; Cf as pF).