Hard Material Piezo Ceramic Disc for DVL Doppler Velocity Logs

Name: Hard Material Piezo Ceramic Disc for DVL Doppler Velocity Logs
Brand: Piezohannas
Rating: 5.0 (17 reviews)

Inquire Buy Now

Product Description

Hard Material Piezo Ceramic Disc for DVL Doppler Velocity Logs

WuHan Piezohannas Tech.Co .,Ltd is a manufactuer of piezoelectric ceramics ,ultrasonic transducers and some other ultrasonic deivce with strong technology force.With a quality management system and research & development sector,our products are extensively used in most applications.

Piezo Ceramics Disc Description:

- Piezo Material: PCrN-4
- Dimensions: Φ20× 3mm
- Resonant Frequency: 700KHZ
- Applications: Doppler velocity logs (DVL), Acoustic Doppler Instrument

Standard Size of Piezo Discs:

range of piezo disc to produce:

Diameter: 2mm-120mm
Thickness:0.1mm-30mm

DVL Application:

A DVL is an acoustic Doppler instrument, and is similar to the acoustic Doppler current profiler (ADCP). It has acoustic beams oriented in a diverging, convex configuration.However, it differs from ADCPs in its ability to estimate the velocity relative to the bottom (Earth being the frame of reference). This is done by estimating the velocity along each beam relative to the bottom. Operating alone, the DVL provides a means to estimate a distance travelled and calculate the current position with simple “dead reckoning” navigation. However, for underwater AUV and ROV operations, this is not sufficient and a DVL is typically one of multiple inputs into a navigation solution. In addition to the DVL, a navigation solution may include inertial sensors, acoustic positioning, heading, depth, and altimeter. These estimates are then passed through estimator algorithms/filters such as a Kalman filter to arrive at an estimate of position.

The value of the DVL into such a solution is that it has zero mean bias and does not drift. The DVL is the critical because without it, the position would drift substantially with time. The DVL helps limit the cumulative errors of a complete navigation solution.

Typical parameters of "Hard" PZT materials performance：

Hard" PZT materials			PZT-41	PZT-42	PZT-43/4D	PZT-82	PBaS-4
Dielectric Constant	ɛ^T_r3		1050	1250	1420	1100	1900

Coupling factor	K_P		0.58	0.58	0.58	0.52	0.59
	K₃₁		0.32	0.33	0.34	0.3	0.34
	K₃₃		0.66	0.67	0.68	0.57	0.68
	K_t		0.48	0.48	0.48	0.4	0.49
Piezoelectric coefficient	d31	10^-12m/v	-106	-124	-138	-100	-160
	d33	10^-12m/v	260	280	300	240	380
	g31	10^-3vm/n	-11.4	-11.2	-11	-10.3	-9.5
	g33	10^-3vm/n	28	25.3	24	25	22.6
Frequency coefficients	N_p		2280	2200	2160	2280	2200
	N₁		1671	1613	1583	1671	1613
	N₃		1950	1900	1875	1950	1850
	N_t		2250	2200	2200	2300	2200
Elastic compliance coefficient	S^e₁₁	10^-12m²/n	11.8	12.7	13.2	11.6	13.2
Machanical quality factor	Qm		1000	800	600	1200	2200

Dielectric loss factor	Tg δ	%	0.3	0.4	0.5	0.3	0.5
Density	ρ	g/cm³	7.5	7.5	7.5	7.6	7.5
Curie Temperature	Tc	°C	320	320	320	310	310
Young's modulus	Y^E₁₁	<10⁹N/m³	85	79	76	86	76
Poison Ratio			0.3	0.3	0.3	0.3	0.33

Hard Material Piezo Ceramic Disc for DVL Doppler Velocity Logs

Product Description

Standard Size of Piezo Discs:

DVL Application:

DVL Application Image:

Related Products