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Brigade Electronics BACKSCAN range of parking sensors are suitable for most vehicle types including cars, vans, trucks, buses, coaches, mobile plant and refuse vehicles. Using proven ultrasonic technology BACKSCAN parking sensors inform the driver of the distance between the vehicle and any obstacle at the rear. As soon as the reverse gear is engaged. The parking sensors start scanning the rear of the vehicle and gives a 3 stage audible and visual warning to the driver. Brigade's parking sensors incorporate dynamic scanning memory (DSM) that prevents false alarms from tow bars, rear mounted tyres and any auxiliary equipment that intrudes in the parking sensors detections zone.

3 Comparison of Machine and Alarm Spectra

The signals presented to the group of subjects were analysed in one-third octave bands and the spectra compared with the alarm spectrum at the level of either 7, 8 or 9, which had been determined in the subject responses as the appropriate level for an effective alarm signal for each machine. The results are shown in Figs 9 to 13. In the following comment, decibels are rounded to the nearest whole number

Cat 725 Machine level = 78 dB LAeq Alarm level = 76 dB LAeq
Here the sound of the machine is dominated by the tone in the 125Hz band. The main alarm sounds in the 1.25kHz to 3.15kHz range are higher than the machine sounds in that region.

JCB 380 Machine level = 83dB LAeq Alarm level = 79 – 82dB LAeq
Here the alarm sounds in the 1.25kHz to 3.15kHz range are 1dB to 6dB higher than the machine sounds in the same range.

Cat 962G Machine level = 86dB LAeq.Alarm level = 82dB LAeq
Here the alarm sounds in the 1.25kHz to 3.15kHz range are similar to or lower then the machine sounds in the same range.

Volvo L150 E Machine level = 86dB LAeq Alarm level = 76 – 79dB LAeq
Here the alarm sounds in the 1.25kHz to 3.15kHz range are lower than or similar to the machine sounds in the same range.

Linde 2.5 Machine level = 86dB LAeq Alarm level = 79dB LAeq Here the alarm sounds in the 1.25kHz to 3.15kHz range are lower than those of the machine sounds in the same range.